3 · Web viewNOTE Other constituents present, such as oxygen (O2), may contribute to such chloride stress-corrosion cracking. ISO 13703:2000 chock block or wedge used beneath a length

Summary of definitions used in ISO/TC 67 documents publishedfrom 1996 to end 2005

Term Definition Standard: publication year

100 % speed highest speed required for any specified operating point ISO 10439:200250/50 weight estimate value representing the median value in the probability

distribution of weight estimatesNOTE The actual weight value is equally likely to be smaller or larger than the 50/50 weight estimate.NOTE The 50/50 weight estimate is used as the basis for weight budgeting.

ISO 19901-5:2003

abandonment act of personnel onboard leaving an installation in an emergency

ISO 13702:1999

abandonment act of personnel onboard leaving an installation in an emergency

ISO 15544:2000

abnormal level earthquakeALE

intense earthquake of abnormal severity under the action of which the structure should not suffer complete loss of integrityNOTE The ALE event is comparable to the abnormal event in the design of fixed structures which are described in ISO 19902 and ISO 19903. When exposed to the ALE, a manned structure is supposed to maintain structural and/or floatation integrity for a sufficient period of time to enable evacuation to take place.

ISO 19901-2:2004

abnormal operating condition

condition which occurs in a process component when an operating variable ranges outside of its normal operating limits

ISO 10418:2003

abnormal value design value of a parameter of abnormal severity used in accidental limit state checks in which a structure is intended not to suffer complete loss of integrityNOTE Abnormal events have probabilities of the order of 103 to 104 per annum. In the limit state checks, some or all of the partial factors are set to 1,0.

ISO 19901-1:2005

absolute volume reciprocal of absolute densityNOTE It is expressed as volume per unit mass.

ISO 10426-2:2003

accelerator substance which, when mixed with a catalyst or a resin, will speed up the chemical reaction between catalyst and resin

ISO 14692-1:2002

acceptance agreement/acknowledgement that side-pocket mandrel component(s) and/or assembly(ies) can be used without restriction

ISO 17078-1:2004

acceptance criteria defined limits placed on characteristics of materials, products or services

ISO 10423:2003

acceptance criteria defined limits placed on characteristics of materials, products or service

ISO 13533:2001

acceptance criteria specified limits of acceptability applied to process or product characteristics

ISO/TS 29001:2003

accessible wetted surface

wetted surface which can be viewed, for purposes of non-destructive examination, by direct line of sightNOTE This excludes test ports, control line ports, lockdown screw holes and other penetrations of these types.

ISO 10423:2003

accessory material seamless standard casing or tubing, or seamless thick-wall tubes or mechanical tubes, or bar stock or hot forgings used for the manufacture of accessories

ISO 11960:2004

accidental load load(s) which are imposed on the C/WO riser system under abnormal and unplanned conditionsEXAMPLES Loss of vessel station-keeping and heave compensator lock-up.

ISO 13628-7:2005

accommodation place where personnel onboard sleep and spend their off-duty ISO 13702:1999

/tt/file_convert/5ac945747f8b9a7d548d1292/document.doc 12/05/20051

timeNOTE It may include dining rooms, recreation rooms, lavatories, cabins, offices, sickbay, living quarters, galley, pantries and similar permanently enclosed spaces.

accommodation place where personnel onboard sleep and spend their off-duty timeNOTE It may include dining rooms, recreation rooms, lavatories, cabins, offices, sickbay, living quarters, galley, pantries and similar permanently enclosed spaces.

ISO 15544:2000

AC-field magnetic field induced by alternating current ISO 15463:2003acoustic simulation process whereby the one-dimensional acoustic characteristics

of fluids and the reciprocating compressor dynamic flow influence on these characteristics are modelledNOTE The model is mathematically based upon the governing differential equations (motion, continuity, etc.). The simulation should allow for determination of pressure/flow modulations at any point in the piping model resulting from any generalized compressor excitation (see 3.4 and 3.7 in original document).

ISO 13707:2000

acoustical simulation process whereby the acoustical characteristics of fluids and the reciprocating-pump dynamic flow influence are modelled

ISO 13710:2004

ACS reagent grade chemical meeting the purity standards specified by the American Chemical Society (ACS)

ISO 10414-1:2001

ACS reagent grade grade of chemical meeting the purity standards specified by the American Chemical Society (ACS)

ISO 10414-2:2002

ACS reagent grade chemical which meets purity standards as specified by the American Chemical Society (ACS)

ISO 10416:2002

ACS reagent grade chemicals which meet purity standards as specified by the American Chemical Society (ACS)

ISO 13500:1998

ACS reagent grade grade of chemical that meets purity standards as specified by the American Chemical Society (ACS)

ISO 13503-3:2005

action external load applied to the structure (direct action) or an imposed deformation or acceleration (indirect action)EXAMPLE An imposed deformation can be caused by fabrication tolerances, settlement, temperature change or moisture variation.NOTE An earthquake typically generates imposed accelerations.

ISO 19900:2002

action external load applied to the structure (direct action) or an imposed deformation or acceleration (indirect action)EXAMPLE An imposed deformation can be caused by fabrication tolerances, settlement, temperature change or moisture variation.NOTE An earthquake typically generates imposed accelerations.[ISO 19900:2002]

ISO 19901-7:2005

action effect effect of actions on structural componentsEXAMPLE Internal force, moment, stress or strain.

ISO 19900:2002

action effect effect of actions on structural components[ISO 19900:2002]EXAMPLE Internal forces, moments, stresses, strains, rigid body motions or elastic deformations.

ISO 19901-7:2005

active analysis portion of the acoustic simulation in which the pressure pulsation amplitudes due to imposed compressor operation for the anticipated loading, speed range and state conditions are simulated (see 3.1 in original document)

ISO 13707:2000

active fire protectionAFP

equipment, systems and methods which, following initiation, may be used to control, mitigate and extinguish fires

ISO 13702:1999

active fire protection method of extinguishing fire by application of substances such as halon, water, CO2, foam, etc.

ISO 14692-1:2002

active maintenance time

that part of the maintenance time during which a maintenance action is performed on an item, either automatically or

ISO 14224:1999


manually, excluding logistic delays[IEC 60050-191:1990]NOTE For more specific information, refer to Figure 191-10 "Maintenance time diagram" in IEC 60050-191.

actual inside diameterDi

inside diameter of a new tubeNOTE The actual inside diameter is used to calculate the tube skin temperature in annex B and the thermal stress in annex C.

ISO 13704:2001

actual yield strength yield strength of material determined from specimens directly related to components used in construction of the test samples

ISO 21329:2004

actuator mechanism for the remote or automatic operation of a valve or choke

ISO 10423:2003

adapter pressure-containing piece of equipment having end connections of different nominal sizes and/or pressure ratings, used to connect other pieces of equipment of different nominal sizes and/or pressure ratings

ISO 10423:2003

adapter pressure-containing piece of equipment having end connections of different nominal size designation and/or pressure rating

ISO 13533:2001

addition section compartment(s) in the surface drilling fluid system between the removal section and the suction section which provides a well-agitated compartment(s) for the addition of commercial products such as chemicals, necessary solids and liquids

ISO 13501:2005

additive material added to a cement slurry to modify or enhance some desired propertyNOTE Properties that are commonly modified include: setting time (by use of retarders or accelerators), fluid loss, viscosity, etc.

ISO 10426-1:2005

additive material added to a cement slurry to modify or enhance some desired propertyNOTE Common properties that are modified include: setting time (by use of retarders or accelerators), fluid loss control, viscosity, etc.

ISO 10426-2:2003

adhesive jointadhesive bond

bonded jointglued jointsocket jointrigid type of joint between two components made using an adhesiveNOTE Generally consists of a slightly conical (tapered) bell end and a machined (cylindrical or tapered) spigot end.

ISO 14692-1:2002

ageing change in metallurgical properties that generally occurs slowly at room temperature (natural ageing) and more rapidly at higher temperature (artificial ageing)

ISO 15156-3:2003

agency entity contracted to inspect new OCTG using the methods and criteria specified

ISO 15463:2003

agitatormechanical stirrer

mechanically driven mixer that stirs the drilling fluid by turning an impeller near the bottom of a mud compartment to blend additives, suspend solids and maintain a uniform consistency of the drilling fluid

ISO 13501:2005

agreement unless otherwise indicated, “by agreement” means “by agreement between manufacturer and purchaser at the time of enquiry and order”

ISO 13628-7:2005

Agreement Unless otherwise indicated “by agreement” means “by agreement between manufacturer and purchaser at the time of enquiry and order”.

ISO 3183-2:1996

air gap clearance between the highest water surface that occurs during the extreme environmental conditions and the lowest exposed part not designed to withstand wave impingement

ISO 19900:2002

air heaterair preheater

heat transfer apparatus through which combustion air is passed and heated by a medium of higher temperature, such

ISO 13705:2001


as the combustion products, steam or other fluidalarm condition preset value of a parameter at which an alarm is actuated to

warn of a condition requiring corrective actionISO 10439:2002

alarm point preset value of a measured parameter at which an alarm is actuated to warn of a condition that requires corrective action

ISO 10437:2003

alarm point preset value of a parameter at which an alarm warns of a condition requiring corrective action

ISO 10438-1:2003

alarm point preset value of a parameter at which an alarm is actuated to warn of a condition that requires corrective action

ISO 13707:2000

alarm point preset value of a measured parameter at which an alarm is activated to warn of a condition that requires corrective action

ISO 13710:2004

allowable operating region

portion of a pump’s hydraulic coverage over which the pump is allowed to operate, based on vibration within the upper limit of this International Standard or temperature rise or other limitation; specified by the manufacturer

ISO 13709:2003

ambient temperature

actual room temperature in the test lab with no residual heat remaining in test specimens from previous thermal tests

ISO 13679:2002

ambient temperature temperature of the surrounding atmosphere in the immediate vicinity of the piping system

ISO 15649:2001

ambient temperature prevailing temperature at test site ISO 16070:2005ampere-turn unit of magnetomotive force which is the product of the

number of turns in a coil and the quantity of amperes of current flowing through it, representing the magnetizing strength of the coilEXAMPLE 800 A in a 6-turn coil gives 4 800 ampere-turns.

ISO 15463:2003

amplitude vertical height of the A-scan received signal, measured from base to peak or peak to peak

ISO 10424-1:2004

analogue simulation method using electrical components (inductances, capacitors, resistances and current supply devices) to achieve the acoustic simulation (see 3.1 in original document).

ISO 13707:2000

anchortieback

metallic or refractory device that holds the refractory or insulation in place

ISO 13705:2001

anchor bolt bolt used to attach the mounting plate to the support structureNOTE The support structure is usually a concrete foundation or steel structure.cf. hold-down bolt (3.6)

ISO 13710:2004

anchor bolts bolts used to attach the mounting plate to the support structure or foundation

ISO 10437:2003

ancillary component component used to control the flexible pipe behaviourEXAMPLES Bend stiffeners and buoyancy modules.

ISO 13628-2:2000

ancillary components components used to control the flexible pipe behaviour, such as buoyancy aids and fire hoods/boxes

ISO 13628-10:2005

ancillary equipment accessory to the umbilical system which does not form part of the main functional purposeEXAMPLES Weak link, buoyancy collar and I-tube or J-tube seals.

ISO 13628-5:2002

angle of rollangle of pitch

angle of movement to one side from vertical ISO 13626:2003

angular misalignment minor angle between the centrelines of two shafts that intersect at a point or, where the shafts do not intersect, the minor angle between the centreline of one shaft and an intersecting line parallel to the centreline of the other shaftSee Figure C.2.NOTE With double-engagement couplings, the term also applies to the minor angle between the centreline of one shaft and the effective centreline of the floating shaft (3.4.8).

ISO 10441:1999


angular misalignment minor angle between the centrelines of two shafts that intersect at a point or, where the shafts do not intersect, the minor angle between the centreline of one shaft and an intersecting line parallel to the centreline of the other shaftSee Figure C.2. in original documentNOTE With double-engagement couplings, the term also applies to the minor angle between the centreline of one shaft and the effective centreline of the floating shaft (3.4.6).

ISO 14691:1999

anisotropic exhibiting different properties when tested along axes in different directions

ISO 14692-1:2002

anneal heat to and hold at a temperature appropriate for the specific material and then cool at a suitable rate, for such purposes as reducing hardness, improving machineability, or obtaining desired properties

ISO 15156-3:2003

annular blowout preventer

blowout preventer that uses a shaped elastomeric sealing element to seal the space between the tubular and the wellbore or an open hole

ISO 13533:2001

annular clearance for perfectly centred casing

wellbore diameter minus casing outside diameter divided by two

ISO 10427-2:2004

annular packoff mechanism that seals off annular pressure between the outside diameter of a suspended tubular member or hanger and the inside diameter of the head or spool through which the tubular member passes or hanger is suspended

ISO 10423:2003

annulus space surrounding the pipe in the wellboreNOTE The outer wall of the annular space may be either surface or casing

ISO 10426-2:2003

annulus space between the internal pressure sheath and outer sheathNOTE Permeated gas and liquid is generally free to move and mix in the annulus.

ISO 13628-2:2000

annulus seal assembly mechanism which provides pressure isolation between each casing hanger and the wellhead housing

ISO 13628-4:1999

anode backfill material with a low resistivity, which may be moisture-retaining, immediately surrounding a buried anode, for the purpose of decreasing the effective resistance between the anode and the electrolyte and to prevent anode polarization

ISO 15589-1:2003

anode potential anode-to-electrolyte potential ISO 15589-2:2004ANSI rating class numerical pressure design class defined in ASME B16.5 and

used for reference purposesNOTE The ANSI rating class is designated by the word "Class" followed by a number.

ISO 14313:1999

ANSI rating class numerical pressure design class defined in ASME B16.5 and used for reference purposesNOTE The ANSI rating class is designated by the word “Class” followed by a number.[ISO 14313:1999]

ISO 14723:2001

ANSI rating class numerical pressure design class defined in ASME B16.5 and used for reference purposesNOTE The ANSI rating class is designated by the word “Class” followed by a number.[ISO 14313:1999]

ISO 15590-3:2004

anti-rotation device device used to prevent rotation of one component relative to an adjacent component in a seal assemblyEXAMPLES Key, pin.

ISO 21049:2004

anti-sludge design design feature of continuously lubricated couplings, intended to minimize the accumulation of sludge

ISO 10441:1999

anti-static design design that provides for electrical continuity between the body, ISO 17292:2004


ball and stem of the valveanti-wear layer non-metallic layer, either extruded thermoplastic sheath or

tape wrapping, used to minimize wear between structural layers

ISO 13628-2:2000

aperture screen cloth opening between the wires in a screen cloth ISO 13501:2005aperture screen surface opening in a screen surface ISO 13501:2005apex opening at lower end of a hydrocyclone ISO 13501:2005API modified thread compound

compound designated as “modified thread compound” in API BUL 5A2

ISO 13678:2000

API Monogram registered mark of the American Petroleum Institute ISO 13628-10:2005API sand physical description particles in a drilling fluid that are too

large to pass through a 74 μm sieve (API 200 screen)NOTE 1 Its amount is expressed as a volume fraction (percent) of drilling fluid.NOTE 2 Particle size is a descriptive term; the particles can be shale, limestone, wood, gold or any other material.

ISO 13501:2005

API screen number mesh, obsoletemesh count, obsoletenumber in an API system used to designate the D100 separation range of a mesh screen clothcf. D100 separation (3.1.23)NOTE 1 The term mesh was formerly used to refer to the number of openings (and fraction thereof) per linear inch in a screen, counted in both directions from the centre of a wire. This term is being replaced by the API screen number.NOTE 2 Mesh count was formerly used to describe the fineness of a square or rectangular mesh screen cloth. For example, a mesh count such as 30 30 or often 30 mesh indicates a square mesh, while a designation such as 70 x 30 mesh indicates rectangular mesh. This term is being replaced by the API screen number.NOTE See 9.6 for further information.

ISO 13501:2005

API threads threads as specified in API Spec 5B ISO 11960:2004apparent weightweight in waterwet weightnet liftsubmerged weighteffective weight

submerged weight including content minus buoyancy ISO 13628-7:2005

application factorKa

factor by which the machine rated torque is multiplied to allow for the fact that the torque required to be transmitted with certain types of driving or driven machines is not constant but varies in a cyclic mannerNOTE Examples of such machines are reciprocating engines or compressors.

ISO 10441:1999

application factorKa

factor by which the machine rated torque is increased to allow for the fact that the torque required to be transmitted with certain types of driving or driven machines is not constant but varies in a cyclic mannerNOTE Examples of application are with reciprocating engines or compressors.

ISO 14691:1999

application level service loading envelope encompassing a group of pipeline and riser applications

ISO 21329:2004

approved welder welder who has been approved in accordance with the requirements of this International Standard

ISO 13847:2000

approved welding operator

welding operator who has been approved in accordance with the requirements of this International Standard

ISO 13847:2000

approved welding welding procedure specification which has been approved in ISO 13847:2000


procedure specification accordance with the requirements of this International Standard[ISO 9956-1:1995]

appurtenance part of the structure that is installed to assist installation, to provide access or protection, or for transfer of fluids

ISO 19900:2002

arc curved portion of a bend ISO 15590-1:2001arc energy product of welding voltage and current divided by travel speed

of weldingNOTE The often-used term “heat input” is more correctly the arc energy modified by an arc efficiency factor.

ISO 13847:2000

arc, verb create intense heat and light by passing an electric current across a gap

ISO 15463:2003

arch flat or sloped portion of the heater radiant section opposite the floor

ISO 13705:2001

area classification division of an installation into hazardous areas and nonhazardous areas and the sub-division of hazardous areas into zonesNOTE This classification is based on the materials which may be present and the probability of a flammable atmosphere developing. Area classification is primarily used in the selection of electrical equipment to minimize the likelihood of ignition if a release occurs.

ISO 13702:1999

Arrangement 1 seal seal configuration having one seal per cartridge assembly ISO 21049:2004Arrangement 2 seal seal configuration having two seals per cartridge assembly

with a containment seal chamber which is at a pressure lower than the seal chamber pressure

ISO 21049:2004

Arrangement 3 seal seal configuration having two seals per cartridge assembly that utilize an externally supplied barrier fluid

ISO 21049:2004

A-scan data presentation utilizing a horizontal base line that indicates distance, or time, and a vertical deflection from the base line that indicates amplitude

ISO 15463:2003

A-scan display ultrasonic instrument display in which the received signal is displayed as a vertical height or “pip” from the horizontal-sweep time trace, while the horizontal distance between two signals represents the material distance for time of travel between the two conditions causing the signals

ISO 10424-1:2004

assembly product comprised of more than one component ISO 14310:2001assembly designed and fabricated group of bulk and equipment items

which form one unitISO 19901-5:2003

asset resource owned by an organization, normally for the purposes of generating income or increasing value

ISO 15663-1:2000

asset life cycle life span of a particular resource owned by an organization, from the point of discovery or acquisition through to disposal

ISO 15663-1:2000

asset phase discrete stage in the asset life cycle with a specified purposeEXAMPLE Detail design.

ISO 15663-1:2000

as-shipped condition condition of the product or equipment when it is ready for shipment

ISO 10423:2003

assumed surface temperatureTAS

assumed temperature at surface used for calculating a pseudo-temperature gradient

ISO 10426-2:2003

atmospheric service operation at gauge pressures between 0,2 kPa vacuum and 35 kPa pressure

ISO 10418:2003

atomizer device used to reduce liquid fuel to a fine mist ISO 13705:2001attachment weld fillet or full penetration weld used for attachment of

components to pipe or couplingISO 13628-7:2005

attenuation decay of seismic waves as they travel from a source to the site under consideration

ISO 19901-2:2004


austenite face-centred cubic crystalline phase of iron-base alloys ISO 15156-3:2003authority having jurisdiction

third-party organization required to be satisfied with the standard of engineering proficiency and safety of a projectEXAMPLE A classification society, verification body or government regulatory body.

ISO 14692-1:2002

automatically fired vessel

fired vessel having the burner fuel controlled by an automatic temperature or pressure controller

ISO 10418:2003

auxiliary line external conduit (excluding choke and kill lines) arranged parallel to the riser main tube for enabling fluid flowEXAMPLE Control system fluid line, buoyancy control line, mud boost line.

ISO 13625:2002

auxiliary line conduit (excluding choke and kill lines) attached to the outside of the riser main pipeEXAMPLES Hydraulic supply line and annulus circulation line.

ISO 13628-7:2005

availability ability of an item to be in a state to perform a required function under given conditions at a given instant of time orover a given time interval, assuming that the required external resources are provided[IEC 60050-191:1990]

ISO 14224:1999

average heat flux density

heat absorbed divided by the exposed heating surface of the coil sectionNOTE Average flux density for an extended-surface tube is indicated on a bare surface basis with extension ratio noted.

ISO 13705:2001

axial displacement change in the relative axial position of the adjacent shaft ends of two coupled machines

ISO 10441:1999

axial displacement change in the relative axial position of the adjacent shaft ends of two coupled machines

ISO 14691:1999

axial load-free testing pressure-testing arrangement using a pipe-sealing device or mechanism such that internal pressure produces hoop and radial stresses only in the component wall

ISO 14692-1:2002

axial natural frequency natural frequency of the mass of the floating shaft supported by the flexible elements acting as axial springsNOTE Some types of flexible-element couplings which have significantly non-linear axial stiffness and/or internal damping may not exhibit an axial natural frequency.

ISO 10441:1999

axial natural frequency natural frequency of the mass of the spacer assembly supported by the flexible elements acting as axial springsNOTE 1 The spring rate of certain designs of flexible elements may be non-linear, varying in relation to the axial deflection. With such designs, a range of axial natural frequencies exists within a band corresponding to deflection amplitudes from zero to the maximum allowable.NOTE 2 Some types of coupling which have significantly non-linear axial stiffness and/or internal damping may not exhibit an axial natural frequency.

ISO 14691:1999

axial reference point axial position on the shaft of the driving or driven machine (normally the extreme end of the shaft) from which axial distance is measured

ISO 10441:1999

axial reference point axial position on the shaft of the driving or driven machine (normally the extreme end of the shaft) from which axial distances are measured

ISO 14691:1999

axially [horizontally] split

<casing joints> parallel to the shaft centreline ISO 10440-1:2000

axially [horizontally] split casing joint

casing joint parallel to the shaft centreline ISO 13691:2001

axially split split with the principal joint parallel to the shaft centreline ISO 10437:2003axially split casing or other component in which the main joint is parallel to

the axis of the shaftISO 10439:2002


axially split split with the principal joint parallel to the shaft centreline ISO 13709:2003axially split casing casing with joints that are parallel to the shaft centerline ISO 10440-2:2001axial-pressure load diagram

plot of pressure versus axial load showing pipe and/or connection test load envelope or limit load extremes

ISO 13679:2002

back reflection signal received from the back surface of a surface test object ISO 10424-1:2004backflow in a process component, fluid flow in the direction opposite to

that of normal flowISO 10418:2003

backing plate support plate attached to the back of screen cloth(s) ISO 13501:2005backlash gear-tooth circumferential clearance normally necessary to

provide angular misalignment capabilityISO 10441:1999

back-pressure valve unidirectional or bidirectional check valve that is installed through the christmas tree, into the tubing hanger, and prevents well fluids from flowing out of the well

ISO 10423:2003

back-to-back configuration

dual seal in which both of the flexible elements are mounted between the mating rings

ISO 21049:2004

backup layer refractory layer behind the hot face layer ISO 13705:2001back-wall reflection ultrasonic signal received from the back surface of the pipe

wallISO 15463:2003

baffle plate or obstruction built into a compartment to change the direction of fluid flow

ISO 13501:2005

balanced draught heater

heater which uses forced-draught fans to supply combustion air and uses induced fans to remove flue gases

ISO 13705:2001

balanced seal mechanical seal in which the seal balance ratio is less than 1 ISO 21049:2004ball joint ball and socket assembly having a central through-passage

equal to or greater than the riser internal diameterNOTE This can be positioned in the riser string to reduce local bending stresses.

ISO 13628-7:2005

ballast variable solid or fluid content used to trim a floating structure and/or keep a certain draft

ISO 19901-5:2003

bank one or more items arranged in a continuous structure ISO 13706:2005bare tube surface total area of the outside surfaces of the tubes, based on the

length measured between the outside faces of the header tubesheets

ISO 13706:2005

baritebaryte

natural barium sulfate (BaSO4) used for increasing the density of drilling fluidsNOTE International Standards require a minimum specific gravity of 4,20 for barite, but do not specify that the material must be barium sulfate. Commercial ISO 13500 barite can be produced from a single ore or a blend of ores, and can be a straight-mined product or processed by flotation methods. It can contain accessory minerals other than barium sulfate (BaSO4). Because of mineral impurities, commercial barite can vary in colour from off-white to grey to red or brown. Common accessory minerals are silicates such as quartz and chert, carbonate compounds such as siderite and dolomite, and metallic oxide and sulfide compounds.

ISO 13501:2005

barrel pump horizontal pump of the double-casing type ISO 13709:2003barrier element forming part of a pressure-containing envelope which

is designed to prevent unintentional flow of produced/injected fluids, particularly to the external environment

ISO 13628-1:2005

barrier one or several barrier elements that are designed to prevent unintended flow of formation fluid

ISO 13628-7:2005

barrier measure which reduces the probability of realizing a hazard’s potential for harm and which reduces its consequence NOTE Barriers may be physical (materials, protective devices, shields, segregation, etc.) or non-physical (procedures, inspection, training, drills, etc.).

ISO 17776:2000

barrier element device that, alone, cannot prevent flow from one side to the ISO 13628-7:2005


other side of itselfbarrier fluid fluid, at a higher pressure than the process pressure being

sealed, introduced between pressurized dual (double) mechanical seals to completely isolate the pump process liquid from the environment

ISO 13709:2003

barrier fluid externally supplied fluid at a pressure above the pump seal chamber pressure, introduced into an Arrangement 3 seal to completely isolate the process liquid from the environment

ISO 21049:2004

base weight contingency

weight addition, based on risk analysis or experience, used to transform a base weight estimate into a 50/50 weight estimate accounting for uncertainties

ISO 19901-5:2003

base weight estimate weight estimate used for budgeting purposes which does not include any unforeseen quantity growth, estimating errors or unnamed events

ISO 19901-5:2003

basic variable one of a specified set of variables representing physical quantities which characterize actions, environmental influences, geometrical quantities, or material properties including soil properties

ISO 19900:2002

batch group of items manufactured or machined under controlled conditions to ensure consistent chemical composition, processing and heat treatment such that the group can be considered as a single population

ISO 21329:2004

batch mixing process of mixing and holding a volume of cement slurry prior to placement in the wellbore

ISO 10426-2:2003

batch-lubricated coupling

coupling designed to be lubricated by a periodically changed charge of oil or grease

ISO 10441:1999

batch-lubricated coupling

coupling designed to be lubricated by a periodically changed charge of oil or grease

ISO 14691:1999

bay one or more tube bundles, serviced by two or more fans, including the structure, plenum and other attendant equipmentNOTE Figure 1 shows typical bay arrangements.

ISO 13706:2005

beanorifice

designed restriction causing the pressure drop in velocity-type SSCSVs

ISO 10432:2004

Bearden unit of consistencyBc

measure of the consistency of a cement slurry when determined on a pressurized consistometer

ISO 10426-1:2005

Bearden units of consistency

units used to express consistency of a cement slurry when determined on a pressurized consistometerNOTE The symbol for consistency when expressed in Bearden units is Bc.

ISO 10426-2:2003

bearing stress average normal stress on the contact surfaces of mating surfaces

ISO 13628-7:2005

bearing-load rating calculated maximum load for bearings subjected to the primary load

ISO 13535:2000

bellmouth part of a guide tube, formed in the shape of a bellmouth, and designed to prevent overbending of the flexible pipe

ISO 13628-10:2005

bellmouth part of a guide tube, formed in the shape of a bellmouth and designed to prevent overbending of the flexible pipe

ISO 13628-2:2000

bellows seal type of mechanical seal which uses a flexible metal bellows to provide secondary sealing and spring-type loading

ISO 21049:2004

bend angle amount of directional change through the bend ISO 15590-1:2001bend limiter any device used to restrict bending of the flexible pipe

NOTE Bend limiters include bend restrictors, bend stiffeners and bellmouths.

ISO 13628-10:2005

bend limiter device used to restrict bending of the flexible pipe NOTE Bend limiters include bend restrictors, bend stiffeners and

ISO 13628-2:2000


bellmouths.bend limiter device for limiting the bend radius of the umbilical by

mechanical meansNOTE It typically comprises a series of interlocking metallic or moulded rings, applied over the umbilical.

ISO 13628-5:2002

bend radius radius of curvature of the flexible pipe measured from the pipe centrelineNOTE Storage and operating minimum bend radii are defined in 5.3.1.6 and 5.3.1.7.

ISO 13628-10:2005

bend radius radius of curvature of the flexible pipe measured to the pipe centrelineNOTE Storage and operating MBRs are defined in 5.3.1.6 and 5.3.1.7.

ISO 13628-2:2000

bend radius radius of curvature as measured to the centreline of a conduit ISO 13628-3:2000bend radius distance from the centre of curvature to the centreline axis of

the bent pipeISO 15590-1:2001

bend restrictor mechanical device that functions as a mechanical stop and limits the local radius of curvature of the flexible pipe to a minimum value

ISO 13628-10:2005

bend restrictor mechanical device that functions as a mechanical stop and limits the local radius of curvature of the flexible pipe to a minimum value

ISO 13628-2:2000

bend stiffener ancillary conically shaped component, which locally supports the pipe to limit bending stresses and curvature of the pipe to acceptable levelsNOTE Bend stiffeners can be either attached to an end fitting or a support structure where the flexible pipe passes through the bend stiffener.

ISO 13628-10:2005

bend stiffener ancillary conically shaped component which locally supports the pipe to limit bending stresses and curvature of the pipe to acceptable levelsNOTE Bend stiffeners can be attached to either an end fitting or a support structure if the flexible pipe passes through the bend stiffener.

ISO 13628-2:2000

bend stiffener device for limiting the bend radius of the umbilical by providing a localized increase in bending stiffnessNOTE The stiffener is usually a moulded device, sometimes reinforced, depending on the required duty, applied over the umbilical.

ISO 13628-5:2002

bending stiffness analogous to the structural stiffness of a rigid beam or pipe (modulus of elasticity times the second area moment of inertia), except that it can vary to a large extent with temperature and pressureNOTE It is often quantified as the product of an applied bending moment times the resultant bend radius of the pipe.

ISO 13628-10:2005

bending stiffness property analogous to the structural stiffness of a rigid beam or pipe (modulus of elasticity times the second area moment of inertia), except that it can vary to a large extent with temperature and pressureNOTE It is often quantified as the product of an applied bending moment and the resultant bend radius of the pipe.

ISO 13628-2:2000

bending strength ratioBSR

ratio of the section modulus of a rotary shouldered box at the point in the box where the pin ends when made up, to the section modulus of the rotary shouldered pin at the last engaged thread

ISO 10424-1:2004

bending stress numberσF

bending stress calculated from the resistance to fatigue cracking at the tooth root fillet

ISO 13691:2001


benefit creation of a capital asset, earning of revenue or improvement of a project environment

ISO 15663-1:2000

benefit creation of a capital asset, earning of revenue or improvement of a project environment

ISO 15663-3:2001

best efficiency pointBEP

flowrate at which a pump achieves its highest efficiency ISO 13709:2003

bevel diameter outer diameter of the contact face of the rotary shouldered connection

ISO 10424-1:2004

bi-directional valve valve designed for blocking the fluid in both downstream and upstream directions

ISO 14313:1999

bi-directional valve valve designed for blocking the fluid in both downstream and upstream directions[ISO 14313:1999]

ISO 14723:2001

bird-caging phenomenon whereby armour wires locally rearrange with an increase and/or decrease in pitch circle diameter asa result of accumulated axial and radial stresses in the armour layer(s)

ISO 13628-5:2002

bit sub sub, usually with two box connections, that is used to connect the bit to the drill stem

ISO 10424-1:2004

black light long-wave ultraviolet light (UV-A) with a wavelength between 320 nm and 400 nm

ISO 15463:2003

black-crested thread non-full-crested thread whose original (black) mill surface has not been completely removed

ISO 15463:2003

bleed drain or vent ISO 14313:1999bleed drain or vent

[ISO 14313:1999]ISO 14723:2001

blind connection end or outlet connection with no centre bore, used to completely close off a connection

ISO 13533:2001

blind flange flange with no centre bore, used to close off completely a flanged end or outlet connection

ISO 10423:2003

blind ram closing and sealing component in a ram blowout preventer that seals the open wellbore

ISO 13533:2001

blinding reduction of open area in a screening surface caused by coating or plugging

ISO 13501:2005

blind-shear ram closing and sealing component in a ram blowout preventer that first shears the tubular in the wellbore and then seals off the bore or acts as a blind ram if there is no tubular in the wellbore

ISO 13533:2001

block valve gate, plug or ball valve that blocks flow into the downstream conduit when in the closed positionNOTE Valves are either single- or double-seated, bi-directional or uni-directional.

ISO 14313:1999

block valve ball or gate valve that blocks flow into the downstream conduit when in the closed positionNOTE 1 Valves are either single- or double-seated, bi-directional or uni-directional.NOTE 2 Adapted from ISO 14313:1999.

ISO 14723:2001

block-in time period required after the driver is tripped to isolate a piece of equipment, such as a compressor, from its system and to de-pressurize it

ISO 10438-1:2003

blowdown valve valve used to connect a process system to the system for discharging inventory to the atmosphere

ISO 10418:2003

blowout point in time at which nitrogen flows through the sample in a fluid loss test

ISO 10426-2:2003

blowout preventer equipment (or valve) installed at the wellhead to contain ISO 13533:2001


BOP wellbore pressure either in the annular space between the casing and the tubulars or in an open hole during drilling, completion, testing or workover operations

blowout preventerBOP

mechanical device capable of containing pressure, used for control of well fluids and drilling fluids during drilling operations

ISO 15156-1:2001

blow-out preventerBOP

device installed at the wellhead to contain well-bore pressure either in the annular space between the casing and the tubulars or in an open hole during drilling, completion, testing or workover

ISO 13628-7:2005

bob fixed inner cylinder of a concentric-cylinder viscometer ISO 13503-1:2003body any portion of wellhead and christmas tree equipment

between end connections, with or without internal parts, which contains well-bore pressure

ISO 10423:2003

body any portion of equipment between end connections, with or without internal parts, which contains wellbore pressure

ISO 13533:2001

bolting threaded fasteners used to join end or outlet connections ISO 13533:2001bolting closure threaded fastener used to assemble well-bore pressure-

containing parts or join end or outlet connectionsEXAMPLES Studs, nuts, bolts and capscrews.

ISO 10423:2003

bond metal conductor, usually copper, connecting two points on the same or on different structures, usually with the intention of providing electrical continuity between the points

ISO 15589-1:2003

bonded pipe flexible pipe where the steel reinforcement is integrated and bonded to a vulcanized elastomeric materialNOTE Textile material is included in the structure to obtain additional structural reinforcement or to separate elastomeric layers.

ISO 13628-10:2005

bonding material material used to secure screen cloth to a backing plate or support screen

ISO 13501:2005

bonnet pressure-containing closure for a body, other than an end or outlet connection

ISO 10423:2003

boost pressure maintained on the spring-return side of a subsea actuator for the purposes of improving closing-time response

ISO 13628-6:2000

booster pump oil pump that takes suction from the discharge of another pump to provide oil at a higher pressure

ISO 10438-1:2003

BOP adapter jointBOP spanner joint

tubing hanger orientation jointspecialized C/WO riser joint used when the C/WO riser is deployed inside a drilling riser and subsea BOP to install and retrieve an orientated subsea tubing hanger

ISO 13628-7:2005

BOP stack assembly of well control equipment including BOPs, spools, valves, hydraulic connectors, and nipples that connect to the subsea wellheadNOTE As commonly used, this term sometimes includes the LMRP.

ISO 13628-7:2005

BOP stack assembly of well control equipment including BOPs, spools, valves, hydraulic connectors and nipples that connects to the subsea wellheadNOTE As commonly used, this term sometimes includes the LMRP.

ISO 13628-7:2005

bore protector device which protects internal bore surfaces during drilling or workover operations

ISO 13628-4:1999

borescope optical instrument with an illuminating lamp, used for inspecting the inside surface of OCTG

ISO 15463:2003

bottom casing packoff mechanism that seals off annular pressure between the outside diameter of a suspended tubular member or hanger and the inside diameter of the spool or tubing head adapter placed over the suspended tubular or hanger

ISO 10423:2003


box internally-threaded end of integral-joint OCTG, or the coupling end of threaded-and-coupled OCTG

ISO 15463:2003

box connection threaded connection on oilfield tubular goods (OCTG) that has internal (female) threads

ISO 10424-1:2004

braze, verb join metals by flowing a thin layer (of capillary thickness) of a lower-melting-point non-ferrous filler metal in the space between them

ISO 15156-1:2001

breakaway thrustbreakaway torque

thrust or torque required for opening a valve with maximum pressure differential

ISO 14313:1999

breakaway thrust [torque]

thrust [torque] required for opening a valve with maximum pressure differentialNOTE Adapted from ISO 14313:1999.

ISO 14723:2001

breaker textile layer impregnated with rubber included in various layers in the pipe cross-section to give additional strength to the pipe, to aid in reducing propagation of cuts in the pipe and to aid the manufacturing processNOTE This layer can be incorporated into either or all of the cover, reinforcing layer and liner.

ISO 13628-10:2005

breech-block coupling coupling which is engaged by partial rotation of one member into an interlock with another

ISO 13625:2002

breeching heater section where flue gases are collected after the last convection coil for transmission to the stack or the outlet ductwork

ISO 13705:2001

bridge plug mechanical device installed in and used for blocking fluid (liquid or gas) communication in the conduit and not installed in a designed receptacle

ISO 14310:2001

bridgewallgravity wall

wall which separates two adjacent heater zones ISO 13705:2001

bridgewall temperature temperature of flue gas leaving the radiant section ISO 13705:2001Brinell hardnessHBW

hardness value, measured in accordance with ISO 6506-1, normally using a 10-mm diameter tungsten ball and a force of 29,42 kN

ISO 15156-2:2003

bubble-point pressurepB

pressure under which gas bubbles will form in a liquid at a particular operating temperatureNOTE See C.2.

ISO 15156-2:2003

budget estimate approved by management or the client as the cost-control mechanism for a project

ISO 15663-1:2000

budget estimate approved by management or the client as the cost control mechanism for a project

ISO 15663-3:2001

budget weight weight reference figures as defined in the weight and load budget and related to the initial or changed design concept

ISO 19901-5:2003

buffer fluid fluid, at a lower pressure than the process pressure being sealed, used as a lubricant or buffer between unpressurized dual (tandem) mechanical seals

ISO 13709:2003

buffer fluid externally supplied fluid, at a pressure lower than the pump seal chamber pressure, used as a lubricant and/or to provide a diluent in an Arrangement 2 seal

ISO 21049:2004

bulk component or arrangement of components defined as stock materials or of low complexityNOTE Bulk items support the equipment items by providing infrastructure around and between them.

ISO 19901-5:2003

bulk density mass per unit volume of a dry material containing entrained air ISO 10426-1:2005bulk density mass per unit volume of a dry material containing entrained air ISO 10426-2:2003bulk expansion increase in the external volume or dimensions of a cement

sampleISO 10426-5:2004

bulk shrinkage decrease in the external volume or dimensions of a cement ISO 10426-5:2004


samplebull gear low-speed rotor of the integral gear ISO 10442:2002bullplug pressure-containing closure for a female threaded end or

outlet connection, which may have an internal counterbore and/or test port

ISO 10423:2003

bundle laid-up functional components and associated fillers in the umbilical prior to sheathingNOTE Typical functional components in a bundle include hoses, tubes, electric cables, optical fibre cables.

ISO 13628-5:2002

buoyancy devices added to the riser joints to reduce their submerged weight

ISO 13625:2002

buoyancy module structure of low-mass material, usually foamed polymers strapped or clamped to the exterior of riser joints, to reduce the submerged mass of the riser

ISO 13628-7:2005

burner device which introduces fuel and air into a heater at the desired velocities, turbulence and concentration to establish and maintain proper ignition and combustionNOTE Burners are classified by the type of fuel fired, such as oil, gas, or a combination of gas and oil, which may be designated as “dual fuel” or “combination”.

ISO 13705:2001

burnish process of smoothing surfaces using frictional contact between the material and some other hard pieces of material, such as hardened steel balls

ISO 15156-2:2003

burst-disk weak point in the outer sheath designed to burst when the gas pressure in the annulus exceeds a specified valueNOTE The weak point is induced by reducing the thickness of the sheath over a localised area.

ISO 13628-2:2000

butterfly damper single-blade damper which pivots about its centre ISO 13705:2001by agreement agreed between the company and the contractor ISO 13847:2000by agreement agreed between manufacturer and purchaser ISO 14313:1999by agreement agreed between manufacturer and purchaser

[ISO 14313:1999]ISO 14723:2001

by agreement agreed between manufacturer and purchaser ISO 15590-1:2001by agreement agreed between manufacturer and purchaser

[ISO 15590-1:2001]ISO 15590-2:2003

by agreement agreed between manufacturer and purchaser[ISO 14313:1999]

ISO 15590-3:2004

by agreement unless otherwise indicated, agreement between the manufacturer and purchaser at the time of enquiry and orderNOTE Adapted from ISO 3183-2:1996.

ISO 21329:2004

by agreement unless otherwise indicated, agreed between manufacturer and purchaser at the time of enquiry and order

ISO 3183-3:1999

cable series of round wires of steel or fabric (circular cross-section) spirally wound (stranded) together and used for structurally reinforcing the pipeNOTE Cable wires for flexible pipes are usually brass or copper coated to promote chemical bonding of the elastomer to the wires.

ISO 13628-10:2005

calculation use of analytical-based formulas or numerical-based methods, e.g. finite element method or boundary element method, to investigate the structural safety of a component/system

ISO 13628-7:2005

calendering process of passing elastomer compound between rollers to produce smooth sheets of elastomerNOTE This process is also used to cover reinforcing cables and textiles with elastomer to form sheets for winding onto pipes.

ISO 13628-10:2005

calibration comparison and adjustment to a standard of known accuracy ISO 10423:2003calibration comparison and adjustment to a standard of known accuracy ISO 13533:2001calibration comparison of an instrument with, or the adjustment of an ISO 15463:2003


instrument to, a known reference(s) standard that is often traceable to a national institute such as the National Institute of Standards and Technology

calibration comparison and adjustment to a standard of known accuracy ISO/TS 29001:2003calibration system documented system of gauge calibration and control ISO 10424-1:2004capacity quantity of gas taken into the compressor at the specified inlet

conditions, compressed and delivered at the specified discharge pressureNOTE 1 It is expressed in units of mass flow or standard volume flow.NOTE 2 The capacity of a compressor does not include any gas that leaks out of the compressor during the compression process, nor any air that leaks into a compressor used as a vacuum pump.

ISO 13631:2002

capacity quantity of gas taken into the compressor at the specified inlet conditions, compressed and delivered at the specified discharge pressureNOTE The capacity of a compessor does not include any gas that leaks out of the compressor during the compression process nor any air that leaks into a compressor used as a vacuum pump.

ISO 13707:2000

capital expenditure money used to purchase, install and commission a capital asset

ISO 15663-1:2000

capital expenditure money used to purchase, install and commission a capital asset

ISO 15663-3:2001

carbon fibre fibre produced by the pyrolysis of organic precursor fibres, such as rayon, polyacrylonitrile or pitch, in an inert environment

ISO 14692-1:2002

carbon steel alloy of carbon and iron containing a maximum of 2 % carbon (mass fraction), 1,65 % manganese (mass fraction), and residual quantities of other elements, except those intentionally added in specific quantities for deoxidation (usually silicon and/or aluminium)

ISO 10423:2003

carbon steel alloy of 2 % carbon and iron containing up to carbon and up to 1,65 % manganese and residual quantities of other elements, except those intentionally added in specific quantities for deoxidation (usually silicon and/or aluminium)NOTE Carbon steels used in the petroleum industry usually contain less than 0,8 % carbon.

ISO 15156-1:2001

carcass interlocked metallic construction that can be used as the innermost layer to prevent, totally or partially, collapse of the pipe due to pipe decompression, external pressure, reinforcement layer pressure and mechanical crushing loadsNOTE It can be used externally to protect the external surface of the pipe.

ISO 13628-10:2005

carcass interlocked metallic construction that can be used as the innermost layer to prevent total or partial collapse of the internal pressure sheath or pipe due to pipe decompression, external pressure, tensile armour pressure and mechanical crushing loadsNOTE It may be used externally to protect the external surface of the pipe.

ISO 13628-2:2000

carload quantity of pipe loaded on a railway car for shipment from the pipe-making facilities

ISO 11960:2004

carousel storage container which can be rotated by a drive about a vertical axisNOTE It incorporates an inner core structure and an outer peripheral structure, both of which support the umbilical. The umbilical is stored at nominally zero tension. Carousels which do not have a structure on their outer periphery to support the umbilical are often known as turntables.

ISO 13628-5:2002


cartridge seal completely self-contained unit (including seal faces, flexible elements, seal gland plate, sleeve and mating ring) which is pre-assembled and preset before installation

ISO 21049:2004

cartridge-type element assembly of all the parts of the pump except for the casing ISO 13709:2003casing pipe run from the surface and intended to line the walls of a

drilled holeISO 10423:2003

casing pipe run from the surface and intended to line the walls of a drilled well

ISO 11960:2004

casing tube used in wells to seal off the bore hole ISO 13680:2000casing metal plate used to enclose the fired heater ISO 13705:2001casing pipe extending from the surface and intended to line the walls

of a drilled wellISO 14310:2001

casing steel pipe used in oil wells to seal off fluids from the bore hole and to prevent the walls of the hole from sloughing off or caving in

ISO 15463:2003

casing and tubing accessory

one-piece tubular section used in a pipe string to provide mechanical and pressure integrity within the pipe string and facilitate the performance of some other function required of that pipe stringEXAMPLES Crossover connectors, swages, nipples, flow couplings, blast joints, etc.NOTE Accessories exclude the other tubular products specifically defined in this International Standard or products included in other ISO (API) specifications.

ISO 11960:2004

casing cementing complete or partial annular cementing of a full casing string ISO 10426-2:2003casing hanger mandrel mechanism used to support a casing string in a casing head

by means of a male or female thread attached to the casingISO 10423:2003

casing head housing equipment attached to the uppermost end of the surface casing which serves to suspend and seal a casing string

ISO 10423:2003

casing head spool equipment attached to another casing head which serves to suspend and seal a secondary casing string

ISO 10423:2003

casing size nominal casing OD as specified in ISO 11960 ISO 14310:2001cast iron iron-carbon alloy containing approximately 2 % to 4 % carbon ISO 15156-2:2003cast, verb pour molten metal into a mould to produce an object of desired

shapeISO 13533:2001

castable insulating concrete poured or gunned in place to form a rigid refractory shape or structure

ISO 13705:2001

casting metal that is obtained at or near its finished shape by the solidification of molten metal in a mould

ISO 15156-2:2003

casting, noun object at or near finished shape obtained by solidification of a fluid substance in a mouldNOTE HIP components are not considered to be a casting.

ISO 10423:2003

casting, noun object at or near finished shape obtained by solidification of a substance in a mould

ISO 13533:2001

category A welded joint longitudinal welded joint within the main shell, communicating chambers, nozzles or transitions in diameter; or any welded joint within a sphere or within a formed or flat head; or circumferential welded joint connecting hemispherical heads to main shells, to transitions in diameters or to communicating chambers

ISO 16812:2002

category B welded joint circumferential welded joint within the main shell, communicating chambers, nozzles, or transitions in diameter including joints between the transitions and a cylinder at either the large or small end; or circumferential welded joint connecting formed heads, other than hemispherical to main shells, to transitions in diameter, to nozzles or to

ISO 16812:2002


communicating chamberscatenary mooring mooring system where the restoring action is provided by the

distributed weight of mooring linesISO 19900:2002

catenary mooring mooring system where the restoring action is provided by the distributed weight of mooring lines[ISO 19900:2002]

ISO 19901-7:2005

caterpillar cable engine in which the umbilical is held between belts which transfer motive power to the umbilical

ISO 13628-5:2002

cathodic protection system

system consisting of a d.c. current source and an anode in order to provide protective current to a metallic structure

ISO 15589-1:2003

cavitation formation of pockets of vapour in a liquid that suddenly collapse, causing very high localized pressures which can lead to serious erosion of boundary surfaces

ISO 14692-1:2002

cavity lenticular, spiral, separate volume created between the pump stator and rotor when they are assembled

ISO 15136-1:2001

cellulosic fireCF

fire involving combustible material such as wood, paper, furniture, etc.

ISO 13702:1999

cementPortland cement

ground clinker generally consisting of hydraulic calcium silicates and aluminates and usually containing one or more of the forms of calcium sulfate as an interground additionNOTE 1 Hydraulic calcium silicates and aluminates are those which harden under water.NOTE 2 Interground additions are added before grinding, rather than after grinding.

ISO 10426-2:2003

cement blend mixture of dry cement and other dry materials ISO 10426-1:2005cement blend mixture of dry cement and other dry materials ISO 10426-2:2003cement class designation achieved using the ISO system of classification of

well cement according to its intended useISO 10426-1:2005

cement classcement type

designation achieved using the ISO system of classifications of well cement in accordance with its intended useNOTE See ISO 10426-1 for further information.

ISO 10426-2:2003

cement grade designation achieved using the ISO system for denoting the sulfate resistance of a particular cement

ISO 10426-1:2005

cement grade designation achieved using the ISO system for denoting the sulfate resistance of a particular cementNOTE See ISO 10426-1 for further information.

ISO 10426-2:2003

cementPortland cement

ground clinker generally consisting of hydraulic calcium silicates and aluminates and usually containing one or more forms of calcium sulfate as an interground additive

ISO 10426-1:2005

cementite microstructural constituent of steels composed principally of iron carbide (Fe3C)

ISO 15156-2:2003

central conductor conductor that is passed through the bore of OCTG in order to create a circular or circumferential magnetic field in the OCTGNOTE This does not imply that the current rod is necessarily centred in the bore of the OCTG.

ISO 15463:2003

centralizer permanent set

change in centralizer bow height after repeated flexingNOTE A bow-spring centralizer is considered to have reached permanent set after being flexed 12 times.

ISO 10427-2:2004

centrifugal pump machine for moving fluid by spinning it using a rotating impeller in a casing with a central inlet and a tangential outletNOTE The path of the fluid is an increasing spiral from the inlet at the centre to the outlet, tangent to the impeller annulus. In the annular space between the impeller vane tips and the casing wall, the fluid velocity is roughly the same as that of the impeller vane tips. Useful work is produced by the pump when some of the spinning fluid flows out of the casing tangential outlet into the pipe system. Power from the motor is used to accelerate the fluid entering the inlet up to

ISO 13501:2005


the speed of the fluid in the annulus. Some of the motor power is expended as friction of the fluid in the casing and impeller.

centrifuge device, rotated by an external force, for the purpose of separating materials of various masses (depending upon specific gravity and particle sizes) from a slurry to which the rotation is imparted primarily by the rotating containing wallsNOTE In a weighted drilling fluid, a centrifuge is usually used to eliminate colloidal solids.

ISO 13501:2005

ceramic fibre fibrous refractory insulation composed primarily of silica and aluminaNOTE Applicable forms include blanket, board, module, rigidized blanket, and vacuum-formed shapes.

ISO 13705:2001

certificate of conformance

documentation declaring that a specific side-pocket mandrel meets the requirements of this part of ISO 17078 and the requirements of the functional specification

ISO 17078-1:2004

chamfer conical surface at the end of pipe having round or buttress threads

ISO 15463:2003

characteristic value value assigned to a basic variable associated with a prescribed probability of not being violated by unfavourable values during some reference periodNOTE The characteristic value is the main representative value. In some design situations a variable can have two characteristic values, an upper and a lower value.

ISO 19900:2002

characteristic value value assigned to a basic variable, an action or a resistance from which the design value can be found by the application of a partial factorNOTE 1 The value usually has a prescribed probability of not being violated which, in the case of an action, will normally relate to a reference period.NOTE 2 Adapted from ISO 19900:2002, definition 2.7.

ISO 19901-7:2005

characterization data data relating to a component or an umbilical giving an indication of performance but not giving specific acceptance/rejection criteria

ISO 13628-5:2002

Charpy V-notch test test to indicate fracture toughness in terms of energy absorbed or lateral expansion or fracture appearance

ISO 13628-7:2005

chart datum local datum used to fix water depths on a chart or tidal heights over an areaNOTE Chart datum is usually an approximation to the level of the lowest astronomical tide.

ISO 19901-1:2005

chatter wavy surface of the thread flank, root, crest, or chamfer, caused by a vibrating cutter insert

ISO 15463:2003

check sectionsuction section

last active section in the surface system which provides a location for rig pump and mud hopper suction, and ideally is large enough to check and adjust drilling fluid properties before the drilling fluid is pumped downhole

ISO 13501:2005

check valve valve that permits fluid to flow freely in one direction and contains a mechanism to automatically prevent flow in the other direction

ISO 10423:2003

check valve device designed to restrict flow in one direction ISO 13628-4:1999chemical analysis determination of the chemical composition of material ISO 10423:2003chemical analysis determination of the chemical composition of material ISO 13533:2001chemical explosion violent combustion of a flammable gas or mist which

generates pressure effects due to confinement of the combustion-induced flow and/or the acceleration of the flame front by obstacles in the flame path

ISO 13702:1999

chemical plant industrial plant for the manufacture or processing of chemicals, or of raw materials or intermediates for such

ISO 15649:2001


chemicalsNOTE A chemical plant may include supporting and service facilities such as storage, utility and waste treatment units.

chemical-resistant glass

glass fibre or synthetic veil having a specific chemical resistance against acidsNOTE Such glass is used primarily as a reinforcement for the resin-rich internal liner of GRP pipe

ISO 14692-1:2002

chinese finger type of gripper or stopper used to hold the umbilical via its outer diameter, comprising a number of spirally interwoven wires attached to a built-in anchorage arrangement

ISO 13628-5:2002

chloride stress-corrosion cracking service

service in which the process stream contains water and chlorides in a sufficient concentration, and at a high enough temperature, to induce stress-corrosion cracking of susceptible materialsNOTE Other constituents present, such as oxygen (O2), may contribute to such chloride stress-corrosion cracking.

ISO 13703:2000

chock block or wedge used beneath a length of pipe so that it cannot roll

ISO 15463:2003

choke equipment used to restrict and control the flow of fluids ISO 10423:2003choke device specifically intended to restrict the flow rate of fluids ISO 13703:2000choke and kill line flexible pipe jumper located between choke manifold and

blow-out preventerISO 13628-10:2005

choke and kill line flexible pipe jumper located between a choke manifold and a blow-out preventer

ISO 13628-2:2000

choke and kill linesC&K lines

external conduits, arranged parallel to the main tube, used for circulation of fluids to control well pressureNOTE Choke and kill lines are primary pressure-containing members.

ISO 13625:2002

choke beanflow bean

replaceable orifice part used in positive chokes to control flowrate

ISO 10423:2003

choke trim pressure-controlling choke component, including choke beans, used to control or regulate the flow of fluidsNOTE One-piece stems, and that segment of multi-piece stems that passes through the pressure boundary, are pressurecontaining components.

ISO 10423:2003

choke-and-kill line external conduits, arranged laterally along the riser pipe, and used to circulate fluids into and out of the wellbore to control well pressure

ISO 13628-7:2005

chopped strand matCSM

reinforcement structure in which short lengths of glass fibre tows, held together by an emulsion or powder binding agent, are dispersed in random directions within a single plane

ISO 14692-1:2002

christmas tree assembly of equipment, including tubing head adapters, valves, tees, crosses, top connectors and chokes attached to the uppermost connection of the tubing head, used to control well production

ISO 10423:2003

christmas tree equipment at a wellhead for the control of fluid production or injection

ISO 15156-1:2001

circular magnetic field circumferential magnetic field

magnetic field in or surrounding a current-carrying conductor, or OCTG, such that the magnetic field is oriented circumferentially within the wall of the OCTG

ISO 15463:2003

circular magnetizationcircumferential magnetization

production of a magnetic field in a pipe wall or coupling such that the magnetic field is oriented circumferentially

ISO 15463:2003

circulation control valve valve normally placed across the circulation point to allow isolation of the tubing strings or tubing/casing during production

ISO 13628-3:2000

circulation point location where communication is established between supply ISO 13628-3:2000


and return fluids for TFL servicingclamp, noun device with internal angled shoulders used to fasten mating

hubsISO 13533:2001

clamping load axial load applied to clamp hubs by the clamp due to bolt tightening

ISO 13533:2001

class number assigned to a product, process or service, associated with the risk of its failure during use due to design or manufacturing, process or service errors, that indicates the appropriate conformity assessment system to be adoptedNOTE The classification of a product, process or service does not take into consideration failure due to misuse or incorrect maintenance of the product, process or service.

ISO/TR 13881:2000

class of firetype of fire

classification used to facilitate the selection of extinguishers ISO 13702:1999

classification action taken to categorize a length of new OCTG based on conformance with the contracted inspection requirements

ISO 15463:2003

clay mineral soft variously coloured earth, commonly hydrous silicate of aluminaNOTE Clay minerals are essentially insoluble in water but disperse under hydration, grinding, heating or velocity effects. Particle sizes of clay mineral can vary from sub-micrometre to larger than 100 µm.

ISO 13501:2005

clay particle colloidal particles of clay mineral having less than 2 µm equivalent spherical diametercf. colloidal solid (3.1.20)

ISO 13501:2005

client weight reserve weight addition with CoG (usually a fixed weight) controlled by the client and used to cater for any orders for variation to the contractual design concept

ISO 19901-5:2003

clinker fused materials from the kiln in cement manufacturing that are interground with calcium sulfate to make cement

ISO 10426-1:2005

clinker fused materials from the kiln in cement manufacturing that are interground with calcium sulfate to make cement

ISO 10426-2:2003

closed-circuit anode potential

anode potential while electrically linked to the pipeline to be protected

ISO 15589-2:2004

closure bolting threaded fasteners used to assemble pressure-containing parts other than end and outlet connections

ISO 13533:2001

coast-down time period required after the driver is tripped for the equipment to come to rest

ISO 10438-1:2003

coating substance material adhering to a surface to change the properties of the surfacecf. blinding (3.1.11)

ISO 13501:2005

coating physical process procedure by which material forms a film that covers the apertures of the screening surfacecf. blinding (3.1.11)

ISO 13501:2005

coating internal and/or external application of a material to a side-pocket mandrel for corrosion protection, paraffin control, etc.

ISO 17078-1:2004

coating breakdown factorfc

ratio of current density required to polarize a coated steel surface as compared to a bare steel surface

ISO 15589-2:2004

CoG envelope defined constraint volume within which the CoG of an assembly must remain for design purposes

ISO 19901-5:2003

cold finishing cold-working operation which results in a permanent strain if a final solution annealing is not performed NOTE The percentage of cold work depends on the specified strength level for each material grade, as shown in Table 3 for the cold-worked condition.

ISO 13680:2000


cold finishing cold working operation (normally cold drawing) with a permanent strain greater than 1,5 %NOTE The level of permanent strain differentiates it from cold sizing operations specified in 6.5.

ISO 3183-3:1999

cold forming process by which a flat product is formed to a pipe without heating

ISO 3183-3:1999

Cold forming and cold finishing

In this context, cold forming is a process by which a flat product is formed to a pipe without heating. Cold finishing is a cold working operation (normally cold drawing) with a permanent strain greater than I,5 %, which differentiates it from sizing operations specified in 6.5.

ISO 3183-2:1996

cold shut horizontal surface discontinuity caused by solidification of the meniscus of the partially cast anodes as a result of interrupted flow of the casting stream

ISO 15589-2:2004

cold work, verb deform metal plastically under conditions of temperature and strain rate that induce strain hardening, usually, but not necessarily, conducted at room temperature

ISO 15156-1:2001

cold working plastic deformation of the thread roots of a rotary shouldered connection, of radii and of cylindrical sections at a temperature low enough to ensure or cause permanent strain of the metal

ISO 10424-1:2004

cold workingcold deformingcold forgingcold forming

deforming metal plastically under conditions of temperature and strain rate that induce strain-hardening, usually, but not necessarily, conducted at room temperature

ISO 15156-2:2003

collapse pressure external pressure differential which causes buckling collapse of a component

ISO 14692-1:2002

collet-type coupling coupling having a slotted cylindrical element joint mating coupling members

ISO 13625:2002

colloidal solid particle of diameter less than 2 µmNOTE This term is commonly used as a synonym for clay particle size.

ISO 13501:2005

Combination gas metal arc and submerged arc-welded (COW) pipe

Tubular product manufactured by forming from strip or plate and welding the abutting edges by addition of filler metal. The pipe having one longitudinal (COWL) or one helical (COWH) seam is produced by a combination of gas metal arc-welding and submerged arc-welding. The gas metal arc-welding process is continuous and first, and followed by the automatic submerged arc-welding process with at least one pass on the inside and at least one pass on the outside of the pipe.

ISO 3183-2:1996

combination gas metal arc- and submerged arc-welded pipe:

Pipe having one longitudinal or helical seam produced by a combination of the welding processes defined in 3.2.1.2 (a) and 3.2.1.2 (b)

ISO 3183-1:1996

combined rod load algebraic sum of gas load and inertia force on the crosshead pin

ISO 13631:2002

combined rod load algebraic sum of gas load and inertia force on the crosshead pinNOTE Gas load is the force resulting from differential gas pressure acting on the piston differential area. Inertia force is that force resulting from the acceleration of reciprocating mass. The inertia force with respect to the crosshead pin is the summation of the products of all reciprocating masses (piston and rod assembly, and crosshead assembly including pin) and their respective acceleration.

ISO 13707:2000

commanded closure closure of the underwater safety valve and possibly other valves depending on the control system designNOTE Such commands may originate manually, automatically or as part of an ESD.

ISO 13628-6:2000

commissioning activities associated with the initial filling of a pipeline system ISO 13623:2000


with the fluid to be transportedcommitted costs those fixed costs that cannot be eliminated or even cut back

without having a major effect on profits or on the organization's objectivesNOTE Committed costs may be identified as sunk costs for the purposes of a study.

ISO 15663-1:2000

communicating chamber

heat exchanger appurtenance which intersects the shell or heads of the heat exchanger and forms an integral part of the pressure-containing envelopeEXAMPLE Sump.

ISO 16812:2002

company owner company or the engineering agency in charge of constructionNOTE The company may act through an inspector or other authorized representative. The company may also be the contractor in some instances.

ISO 13847:2000

compatibility capacity to form a fluid mixture that does not undergo undesirable chemical and/or physical reactions

ISO 10426-2:2003

completion fluid any fluid used during the completion phase of a well ISO 13503-1:2003completion riser riser that is designed to fit inside a BOP to allow installation of

a tubing hanger, and may also be suitable for connection to the tree upper connection for use as a means for running the tree or for use as a workover riser

ISO 13628-4:1999

completion riser temporary riser that is designed to run inside a BOP and drilling riser to allow for well completionNOTE Completion operations are performed within the drilling riser. A completion riser can also be used for open-sea workover operations.

ISO 13628-7:2005

completion/workover riserC/WO riser

temporary riser used for completion or workover operations ISO 13628-7:2005

compliant structure structure that is sufficiently flexible that applied lateral dynamic actions are substantially balanced by inertial reactions

ISO 19900:2002

component machinery and hardware item, such as reservoir, pump, cooler, filter, valve and instrument, that is part of the system

ISO 10438-1:2003

component part of the pressure-containing equipment, which can be considered as an individual item for the calculationNOTE Includes structural components like pipes, connectors, stress joints, tension joints, landing blocks, slick joints, tubing hanger orientation joints, adapter joints, etc.

ISO 13628-7:2005

component individual part of an assembly ISO 14310:2001component variant individual component ISO 14692-1:2002composite reinforcing fibres laid up in a resin matrix ISO 14692-1:2002composite pipe pipe manufactured using fibre-reinforced thermoset plastics

NOTE Thermoplastic resins are excluded from ISO 14692 (all parts).ISO 14692-1:2002

compound mix of elastomer material and various additives immediately prior to the curing process

ISO 13628-10:2005

compressive load force creating compression that may be applied to a side-pocket mandrel

ISO 17078-1:2004

compressive strength force per unit area required to crush a set cement sample ISO 10426-1:2005compressive strength strength of a set cement sample measured by the force

required to crush itNOTE It is expressed as force per unit area.

ISO 10426-2:2003

compressor rated point point on the 100 % speed curve at the highest capacity of any specified operating pointNOTE The use of the word “design” in any term (such as design power, design pressure, design temperature, or design speed) should be avoided in the purchaser's specification. This terminology should

ISO 10439:2002


be used only by the equipment designer and manufacturer.compressor stage one or more rotors operating in a casing, the displacement

being effected by vanes, meshing elements, or by displacement of the rotor itself

ISO 10440-2:2001

concentric-cylinder viscometer

rotational viscometer that consists of a concentric-cylindrical bob and a cylindrical rotor

ISO 13503-1:2003

conditional distributionconditional probability

statistical distribution (probability) of the occurrence of a variable A, given that other variables B, C, … have certain assigned valuesNOTE The conditional probability of A given that B, C, … occur is written as P(A|B,C,…). The concept is applicable to metocean parameters, as well as to actions and action effects. EXAMPLE When considering wave parameters, A can be the individual crest elevation, B the water depth and C the significant wave height, and so on.

ISO 19901-1:2005

conductance permeability per unit thickness of a static (not in motion) shale-shaker screenNOTE It is expressed in units of kilodarcies/millimetre.1)

ISO 13501:2005

conductor tubular pipe extending upward from the sea floor or below containing pipes that extend into the petroleum reservoir

ISO 19900:2002

conductor housing top of the first casing string which forms the basic foundation of the subsea wellhead and provides attachments for guidance structures

ISO 13628-4:1999

conduit casing, tubing or liner, either metallic or non-metallic ISO 14310:2001confidence factorKc

factor by which the machine rated torque is increased to allow for uncertainties in the determination of the machine rated torque and possible future changes to the application

ISO 14691:1999

conformance compliance with specified requirements ISO 10423:2003conformance compliance with specified requirements in every detail ISO 13533:2001connection threaded assembly of tubular components ISO 11960:2004connection pipe assembly consisting of two threaded male connection

members (pins) and a coupling, or one pin and an integral female connection member (box)

ISO 13678:2000

connection assembly consisting of either two pins and a coupling or one pin and an integral box

ISO 13679:2002

connection threaded or flanged joint that mates a port to a pipe or to a piece of tubing

ISO 21049:2004

connector device used to provide a leak-tight structural connection between the end fitting and adjacent pipingNOTE Connectors include bolted flanges, clamped hubs and proprietary connectors. They can be designed for diver-assisted makeup or for diverless operation using either mechanical or hydraulic apparatus.

ISO 13628-10:2005

connector device used to provide a leak-tight structural connection between an end fitting and adjacent pipingNOTE Connectors include bolted flanges, clamped hubs and proprietary connectors. They may be designed for diverassisted makeup or for diverless operation using either mechanical or hydraulic apparatus.

ISO 13628-2:2000

connector mechanical device used to connect adjacent components in the riser system to create a structural joint resisting applied loads and preventing leakageEXAMPLES Threaded types, including (i) one male fitting (pin), one female fitting (integral box) and seal ring(s), or (ii) two pins, a coupling and seal sea ring(s); flanged types, including two flanges, bolts and a gasket/seal ring; clamped hub types, including hubs, clamps, bolts and seal ring(s); dog-type connectors.

ISO 13628-7:2005

connector mechanical device used to connect adjacent components in ISO 21329:2004


the pipelineconsequence of failure results of the failure of the product, process or service

NOTE In the petroleum and natural gas industries, the most commonly used measure of consequence is financial cost. This implies that the intangible aspects of the results following a failure, such as community acceptance, be translated to financial cost. The cost for failure can comprise cost for restoring the environment (i.e. damage to the environment), deferred or loss of production, reduction in efficiency, health and safety-related cost, etc.

ISO/TR 13881:2000

consistometer device used to measure the thickening time of a cement slurry under temperature and pressure

ISO 10426-1:2005

consistometer device used to measure the thickening time of a cement slurry under specified temperature and pressure

ISO 10426-2:2003

console total system whose components and controls are packaged as a single unit on a continuous or joined baseplateNOTE With a console, the purchaser needs only to make external connections.

ISO 10438-1:2003

constraint limit imposed externally or internally by the project which rules out the selection of an option if the limit is exceeded

ISO 15663-1:2000

constraint limit imposed externally or internally by the project which rules out the selection of an option if it is exceeded

ISO 15663-3:2001

consumables variable content, which is solid in stores and fluid in utility tanksEXAMPLES Fuel, provisions, service/potable water, operating utilities.

ISO 19901-5:2003

contact stress numberσH

contact stress calculated based on the Hertzian contact pressure

ISO 13691:2001

contacting seal seal design in which the mating faces are not designed to intentionally create aerodynamic or hydrodynamic forces to sustain a specific separation gapNOTE Contacting seals can actually develop a full fluid film but this is not typical. Contacting seals do not incorporate geometry, e.g. grooves, pads, face waviness, to ensure that the faces do not touch. The amount of contact is generally very low and permits reliable operation with low leakage.

ISO 21049:2004

containment situation in which the hazardous material is held safely in a pressurized system

ISO 10418:2003

containment seal seal design with one flexible element, seal ring and mating ring mounted in the containment seal chamberNOTE The outer seal for all Arrangement 2 configurations is a containment seal.

ISO 21049:2004

containment seal chamber

component forming the cavity into which the containment seal is installed

ISO 21049:2004

continuous welded pipe: Pipe having one longitudinal seam produced by the continuous welding process defined in 3.2.1.1 (a). (This type of pipe is a type of butt-welded pipe.)

ISO 3183-1:1996

continuous-flow transfer valve

valve that can simultaneously divert both inlet and outlet flows from one component to its installed spare equipment without altering the continuity of full flow through the transfer valve to the equipment

ISO 10438-1:2003

continuously lubricated coupling

coupling designed to be lubricated by a continuous external supply of oil

ISO 10441:1999

continuous-pumping squeeze-cementing operation

squeeze-cementing operation that does not involve cessation of pumping

ISO 10426-2:2003

contour, verb taper gradually by filing or grinding to remove abrupt changes in the wall thickness

ISO 15463:2003


contour-grind, verbradius-grind

grind to remove sharp edges and/or abrupt changes in the wall thickness around imperfections or areas of exploratory grinding

ISO 15463:2003

contractor entity that actually performs the work covered by this International Standard

ISO 13847:2000

contractor party which carries out all or part of the design, engineering, procurement, construction and commissioning for a project or operation of a facilityNOTE The principal (2.1.9) may undertake all or part of the duties of the contractor.

ISO 14692-1:2002

contractor weight reserve

weight addition (usually a fixed weight) controlled by the contractor and used to cater for any design growth due to development of the initial design concept

ISO 19901-5:2003

control <of hazards> limiting the extent and/or duration of a hazardous event to prevent escalation

ISO 13702:1999

control <of hazards> limiting the extent and/or duration of a hazardous event to prevent escalation

ISO 15544:2000

control (of hazards) limiting the extent and/or duration of a hazardous event to prevent escalation

ISO 17776:2000

control feature organization’s documented method to perform an activity under controlled conditions to achieve conformity to specified requirements

ISO/TS 29001:2003

control line conduit utilized to transmit control signals to SCSSVs ISO 10417:2004control mechanism all of the equipment between the speed governor and the

governor-controlled valve(s) (such as linkages, pilot valves, power servos, and so forth)

ISO 10437:2003

control module assembly of subsea control equipment for piloted or sequential hydraulic or electrohydraulic operations from surfaceNOTE Can be configured as a riser control module used for operation of landing strings in tubing hanger mode or as a workover control module in tree mode for operation of the lower workover package.

ISO 13628-7:2005

control oil oil required to operate such components as relays, servomotors and power pistons on the main equipment

ISO 10438-1:2003

control path lengthCPL

total distance that a control signal (electrical or hydraulic) travels to the subsea control module or valve actuator

ISO 13628-6:2000

control stationCS

place on the installation from which personnel can monitor the status of the installation, initiate appropriate shutdown actions and undertake any emergency communication

ISO 13702:1999

control station place on the installation from which personnel can monitor the status of the installation, initiate appropriate shutdown actions and undertake emergency communication

ISO 15544:2000

controlled cooling cooling from an elevated temperature in a pre-determined manner to avoid hardening, cracking or internal damage, or to produce a desired microstructure or mechanical properties

ISO 11960:2004

convection section portion of the heater in which the heat is transferred to the tubes primarily by convection

ISO 13705:2001

cool-off time period during which oil has to be circulated through the equipment to prevent heat damage after the driver is tripped

ISO 10438-1:2003

corbel projection from the refractory surface generally used to prevent flue gas bypassing the tubes of the convection section if they are on a staggered pitch

ISO 13705:2001

core generic term used to describe an individual electrically insulated conductor

ISO 13628-5:2002

corrective maintenance maintenance carried out after fault recognition and intended to put an item into a state in which it can perform a

ISO 14224:1999


required function[IEC 60050-191:1990]NOTE For more specific information, refer to Figure 191-10 "Maintenance time diagram" in IEC 60050-191.

corrosion allowance amount of wall thickness added to the pipe or component to allow for corrosion, scaling, abrasion, erosion, wear and all forms of material loss

ISO 13628-7:2005

corrosion allowance CA

additional material thickness added to allow for material loss during the design life of the component

ISO 13704:2001

corrosion allowance additional material thickness added to allow for material loss due to corrosion

ISO 13705:2001

corrosion cap cap placed over the wellhead to protect it from contamination by debris, marine growth, or corrosion during temporary abandonment of the well

ISO 13628-4:1999

corrosion rate rate of reduction in the material thickness due to chemical attack from the process fluid or flue gas or bothNOTE Corrosion rate is expressed in millimetres per year (mils per year).

ISO 13705:2001

corrosion-erosion eroding away of a protective film of corrosion product by the action of the process stream, exposing fresh metal which then corrodesNOTE Extremely high metal mass loss can occur under these conditions.

ISO 13703:2000

corrosion-resistant alloyCRA

nonferrous-based alloy in which any one or the sum of the specified amount of the elements titanium, nickel, cobalt, chromium, and molybdenum exceeds 50 % (mass fraction)

ISO 10423:2003

corrosion-resistant alloy

alloy intended to be resistant to general and localized corrosion and/or environmental cracking in environments that are corrosive to carbon and low-alloy steels

ISO 13680:2000

corrosion-resistant alloyCRA

alloy intended to be resistant to general and localized corrosion of oilfield environments that are corrosive to carbon steels

ISO 15156-1:2001

corrosion-resistant alloys

ferrous and non-ferrous alloys which are more corrosion resistant than low alloy steelsNOTE This term includes nickel alloys, stainless steels, copper-nickel alloys and titanium.

ISO 13628-4:1999

corrosion-resistant ring groove

ring groove lined with metal resistant to metal-loss corrosion ISO 13533:2001

corrosion-resistant ring grooves

ring grooves lined with metal resistant to metal-loss corrosionNOTE This metal is either a CRA or an austenitic stainless steel.

ISO 10423:2003

corrosive gas gas which, when dissolved in water or other liquid, causes corrosion of metalNOTE Corrosive gases usually contain hydrogen sulfide (H2S), carbon dioxide (CO2) and/or oxygen (O2).

ISO 13703:2000

corrosive hydrocarbon service

service in which the process stream contains water or brine and carbon dioxide (CO2), hydrogen sulfide (H2S), oxygen (O2) or other corrosive agents under conditions which cause corrosion of metal

ISO 13703:2000

cost breakdown structure

structure related to the methods that an organization employs to record and report costs

ISO 15663-1:2000

cost breakdown structure

structure which relates to the methods that an organization will employ to record and report costs

ISO 15663-3:2001

cost driver major cost element which if changed will have a major impact on the life-cycle cost of an option

ISO 15663-1:2000

cost driver major cost element which, if changed, will have a major impact on the life-cycle cost of an option

ISO 15663-3:2001

cost element identifiable part of the life-cycle cost of an option which can be ISO 15663-1:2000


attributed to an activitycost element identifiable part of the life-cycle cost of an option which can be

attributed to an activityISO 15663-3:2001

cost issue cost element which if changed will not have a major impact on the life-cycle cost of an option

ISO 15663-1:2000

couplant material (usually a liquid) used between an ultrasonic transducer and the test specimen to assist transmission of ultrasonic sound waves between them

ISO 15463:2003

coupling internally threaded cylinder for joining two lengths of threaded pipe

ISO 11960:2004

coupling axial reaction force

axial force developed within the coupling which results from the imposed operating conditionsNOTE 1 Axial deflection, misalignment, speed, temperature, etc. are examples of imposed operating conditions.NOTE 2 Coupling axial reaction force is a function of the shape and stiffness of the flexible elements or the sliding friction between the elements of a mechanical contact coupling.

ISO 10441:1999

coupling axial reaction force

axial force developed within the coupling resulting from the imposed operating conditionsNOTE 1 Examples of imposed operating conditions are axial deflection, misalignment, speed, temperature, etc.NOTE 2 The force is a function of the shape and stiffness of the flexible-elements or the sliding friction between the elements of a mechanical contact coupling.

ISO 14691:1999

coupling blank unthreaded material used to produce an individual coupling ISO 11960:2004coupling continuous rated torqueTc

the coupling manufacturer's declared maximum torque which the coupling will transmit continuously, for unlimited periodsNOTE 1 The coupling continuous rated torque is expressed as either:a single value at the coupling rated speed, when simultaneously subjected to the coupling rated maximum continuous angular misalignment (at each plane of flexure) and the coupling rated maximum continuous axial displacement,or a range of values expressed as an interrelated function of speed, misalignment and axial displacement.NOTE 2 For certain types of coupling, particularly those with elastomeric elements or inserts, the coupling continuous rated torque may also be a function of the operating temperature.

ISO 10441:1999

coupling continuous rated torqueTc

coupling manufacturer's declared maximum torque that the coupling will transmit continuously for not less than 25 000 h NOTE 1 It is expressed either as a single value at the coupling rated speed, when simultaneously subjected to the coupling rated maximum continuous misalignment (both angular misalignment and parallel or lateral offset) and the coupling rated maximum continuous axial displacement, or as an interrelated function of speed, misalignment and axial displacement.NOTE 2 For certain types of coupling, particularly those with elastomeric elements or inserts, the coupling continuous rated torque may also be a function of the operating temperature.

ISO 14691:1999

coupling mass simulator

auxiliary device designed to correctly simulate both the effective mass and the effective location of the centre of mass of a half-coupling with respect to the shaft on which it is mounted

ISO 10441:1999

coupling rated maximum continuous angular misalignment

maximum angular misalignment, at each plane of flexure, which the coupling is able to tolerate continuously for unlimited periodsNOTE It is expressed as either:a single value when transmitting the coupling continuous rated torque at the coupling rated speed, and simultaneously subjected to the coupling rated maximum continuous axial displacement

ISO 10441:1999


or a range of values expressed as an interrelated function of speed, torque and axial displacement.

coupling rated maximum continuous axial displacement

maximum axial displacement the coupling is able to tolerate continuously for unlimited periodsNOTE It is expressed as either:a single value when transmitting the coupling continuous rated torque at the coupling rated speed, and simultaneously subjected to the coupling rated maximum continuous angular misalignmentor a range of values expressed as an interrelated function of speed, torque and angular misalignment.

ISO 10441:1999

coupling rated maximum continuous axial displacement

maximum axial displacement the coupling is able to tolerate continuously for not less than 25 000 h at the coupling rated speed, when transmitting the coupling continuous rated torque and simultaneously subjected to the coupling rated maximum continuous misalignment

ISO 14691:1999

coupling rated maximum continuous misalignment

maximum misalignment (both angular misalignment and parallel or lateral offset) the coupling is able to tolerate continuously for not less than 25 000 h at the coupling rated speed, when transmitting the coupling continuous rated torque and simultaneously subjected to the coupling rated maximum continuous axial displacement

ISO 14691:1999

coupling rated speed maximum rotational speed at which the coupling is capable of continuously transmitting the coupling continuous rated torque when simultaneously subjected to the coupling rated maximum continuous angular misalignment and the coupling rated maximum continuous axial displacement

ISO 10441:1999

coupling rated speed maximum speed at which the coupling is capable of continuously transmitting the coupling continuous rated torque when simultaneously subjected to the coupling rated maximum continuous misalignment and the coupling rated maximum continuous axial displacement

ISO 14691:1999

coupling sleeve component with internal teeth ISO 10441:1999coupling stock seamless thick-wall tube or mechanical tube used for the

manufacture of coupling blanksISO 11960:2004

coupling stock tubular stock used for the manufacture of coupling blanks ISO 13680:2000coupon representative metal sample of known surface area used to

quantify the extent of corrosion or the effectiveness of applied cathodic protection

ISO 15589-1:2003

cover layer of elastomer between the reinforcing layer and the external environment (or external carcass if provided) used to protect the pipe against penetration of seawater and other external environments, corrosion, abrasion and mechanical damage

ISO 13628-10:2005

crab lay installation deployment activity whereby the installation vessel moves sideways along, or at the end of, the installation route

ISO 13628-5:2002

crack tip opening displacementCTOD

measure of crack severity that can be compared against a critical value at the onset of crack propagation

ISO 13628-7:2005

crest top of a thread ISO 15463:2003critical area highly stressed region of a primary-load-carrying component

as defined by the manufacturerISO 13534:2000

critical area highly stressed regions on a primary load-carrying component ISO 14693:2003critical component part having requirements specified in this International

StandardISO 13533:2001

critical component component which is necessary to maintain stability of a structure and which resides within the primary load paths of

ISO 13626:2003


the structure when the structure is loaded under the design loadings of Clause 7

critical component part that is pressure containing and/or load bearing ISO 16070:2005critical failure failure of an equipment unit which causes an immediate

cessation of the ability to perform its required functionNOTE For well-completion equipment, see additional information in A.4.5. in original document

ISO 14224:1999

critical speed shaft rotational speed at which the rotor-bearing-support system is in a state of resonance

ISO 10437:2003

critical speed finite speed where resonance exists ISO 10440-2:2001critical speed shaft rotational speed at which the rotor-bearing-support

system is in a state of resonance with any exciting frequency associated with that speed

ISO 13691:2001

critical speed shaft rotational speed at which the rotor-bearing-support system is in a state of resonance

ISO 13709:2003

critical weld weld which joins critical components ISO 13626:2003cross pressure-containing fitting with a minimum of four openings ISO 10423:2003crossover flexible flowline crossing another pipe already laid on the

seabedNOTE The underlying pipe may be a steel pipe or another flexible pipe. It may be required to support the overlying pipe to prevent overbending or crushing of the new or existing pipes.

ISO 13628-10:2005

crossover interconnecting piping between any two heater-coil sections ISO 13705:2001cross-over connector adapter with a restricted-area sealing means and with a top-

connection pressure rating above that of the lower connectionISO 10423:2003

cross-over flange double- or single-studded adapter flange with a restricted-area sealing means and with a top-connection pressure rating above that of the lower connection

ISO 10423:2003

cross-over spool flanged or other connected equipment with a restricted-area sealing means, at or near the face of its lower flangeNOTE Cross-over spools are also provided with suitable means to suspend and seal around an inner string of casing or tubing. A cross-over spool has a top connection with a pressure rating above that of the lower connection.

ISO 10423:2003

crown block assembly stationary sheave or block assembly installed at the top of a derrick or mast

ISO 13626:2003

crown diameter major diameter of the external teeth ISO 10441:1999crystallizing fluid fluid which is in the process of forming solids or which may

form solids due to dehydration or chemical reactionISO 21049:2004

cure change irreversibly the properties of a thermosetting resin by chemical reactionNOTE 1 Examples of such chemical reaction are condensation, ring closure and addition.NOTE 2 Cure may be accomplished by the addition of a cross-linking agent, with or without heat and pressure.

ISO 14692-1:2002

cure cycle time/temperature/pressure cycle used to cure a thermosetting resin system

ISO 14692-1:2002

curing process of changing irreversibly, usually at elevated temperatures, the properties of a thermosetting resin or an elastomer compound by chemical reactionNOTE Cure can be accomplished by the addition of curing (cross-linking) agents, with or without heat and pressure.

ISO 13628-10:2005

curing agent catalytic or reactive agent that, when added to a resin, causes polymerizationNOTE Also called hardener, for epoxies.

ISO 14692-1:2002

cut, noun gouge or distortion in two or more thread crests in a line, either parallel to the pipe axis or at an angle across the threads

ISO 15463:2003


cuttings formation pieces dislodged by the drill bit and brought to the surface in the drilling fluidNOTE Field practice is to call all solids removed by the shaker screen “cuttings,” although some can be sloughed material.

ISO 13501:2005

d.c. decoupling device protective device that conducts electricity when predetermined threshold voltage levels are exceededEXAMPLE Polarization cells, spark gaps and diode assemblies.

ISO 15589-1:2003

D100 separation particle size, expressed in micrometres, determined by plotting the percentage of aluminium oxide sample separated by the test screen on the plot of cumulative mass fraction (as percent) retained versus U.S. Sieve Opening (expressed in micrometres) for the sieve analysis of the aluminium oxide test sampleNOTE 100 % of the particles larger than the D100 separation are retained by the test screen.

ISO 13501:2005

damper device for introducing a variable resistance in order to regulate the flow of flue gas or air

ISO 13705:2001

darcy kpermeability of a porous medium, where one darcy is the flow of a single-phase fluid of 1 cP viscosity that completely fills the voids of the porous medium, flowing through the medium under conditions of viscous flow at a rate of 1 cm3s1cm2 cross-sectional area, and under a pressure or equivalent hydraulic gradient of 1 atmcm1NOTE 1 cP = 1 mPas.

ISO 10416:2002

data acquirer person or organization in charge of the data collection process ISO 14224:1999data acquisition system system for storing and/or providing permanent copies of test

informationEXAMPLES Strip chart recorders, circular chart recorders or computer systems.

ISO 13533:2001

date of manufacture date of manufacturer’s final acceptance of finished equipment ISO 10423:2003date of manufacture date of the manufacturer's final acceptance of finished

equipmentISO 13533:2001

date of manufacture date chosen by the manufacturer occurring between the initiation of manufacture and the delivery to the purchaser

ISO 13626:2003

date of manufacture date of manufacturer's final acceptance of finished productsNOTE The date is expressed as “day-month-year” in the format DD-MM-YYYY.

ISO 17078-1:2004

date of repair/remanufacture

date of repairer’s/remanufacturer’s final acceptance of finished equipment

ISO 10423:2003

datum elevation elevation to which values of NPSH are referredcf. net positive suction head (3.28)

ISO 13709:2003

DC-field residual or active magnetic field induced by direct current ISO 15463:2003deadweight total carrying capacity of a floating structure

NOTE Includes weight of crude oil, deck cargo, temporaries, water, snow and ice accumulations, marine growth, ballast water, consumables, crew and their effects.

ISO 19901-5:2003

decanting centrifuge centrifuge which removes solids from a feed slurry by rotating the liquid in cylindrical bowl at high speed and discharges the larger particles as a damp underflowNOTE Colloidal solids are discharged with the liquid overflow, or light slurry. The decanting centrifuge has an internal auger that moves solids that have settled to the bowl walls out of a pool of liquid and to the underflow.

ISO 13501:2005

decarburization loss of carbon from the surface of a ferrous alloy as a result of heating in a medium that reacts with the carbon at the surface

ISO 10424-1:2004

decommissioning process of shutting down a platform and removing hazardous ISO 19900:2002


materials at the end of its production lifedeep water water depth generally ranging from 610 m (2 000 ft) to

1 830 m (6 000 ft)NOTE Since the physical circumstances of any situtation will change as a function of water depth, use of the term “deep water” implies that it may be necessary to consider design and/or technology alternatives.

ISO 13628-1:2005

defect imperfection of sufficient magnitude to warrant rejection of the product based on criteria defined in this International Standard

ISO 11960:2004

defect Imperfection of sufficient magnitude to warrant rejection of the product based on the stipulations of this International Standard.

ISO 11961:1996

defect imperfection having sufficient magnitude to warrant rejection of the product based on the stipulations of this International Standard

ISO 13680:2000

defect imperfection of sufficient magnitude or properties to warrant rejection of OCTG based on the specified acceptance criteria

ISO 15463:2003

defect imperfection of sufficient magnitude to warrant rejection of the productNOTE Rejection will be based on the provisions of this International Standard.

ISO 15546:2002

defect imperfection of a size and/or population density greater than the acceptance criteria defined in this part of ISO 3183NOTE Defects are considered to adversely affect or limit the intended use of the product.

ISO 3183-3:1999

defects A “defect” is an imperfection of sufficient magnitude to preclude acceptance of the product in accordance with this part of IS0 3183.

ISO 3183-1:1996

Defects Defects are imperfections with a size and/or population density that are greater than the acceptance criteria defined in this part of IS0 3183. Defects are considered to adversely affect or limit the intended use of the product.

ISO 3183-2:1996

deflector internal device that guards landed side-pocket devices or discriminates the landing of side-pocket devices into the side-pocket mandrel pocket (receptacle for mandrel devices), but deflects non-side-pocket devices, thus allowing the latter to pass through the side-pocket mandrel, when being deployed down hole

ISO 17078-1:2004

delamination separation of two adjacent plies or layers of material in a laminate resulting from lack of adhesionNOTE May occur either locally or covering a wide area.

ISO 14692-1:2002

delivery point in time and physical location at which the agreed transfer of ownership takes place

ISO/TS 29001:2003

deluge system system to apply fire-water through an array of open spray nozzles by operation of a valve on the inlet to the system

ISO 13702:1999

demagnetization process of removing part or all of the residual magnetism from OCTG

ISO 15463:2003

demand activation of the function (includes both operational and test activation)

ISO 14224:1999

density mass divided by volumeNOTE 1 In the SI system, density is expressed in kilograms per cubic metre (kg/m3); In United States Customary units it is expressed as pounds per gallon (lb/gal) or pounds per cubic foot (lb/ft3).NOTE 2 Drilling fluid density is commonly referred to as “drilling fluid weight” or “mud weight.”

ISO 13501:2005

deployment system all equipment involved in the launch and recovery of the ROT system

ISO 13628-9:2000


depth prove-up act of grinding a narrow notch across a surface-breaking indication until the bottom of the indication is located and then measuring the depth of the indication with a depth gauge for comparison to acceptance criteria

ISO 10424-1:2004

depth rating maximum rated working depth of a piece of equipment at a given set of operating conditions

ISO 13628-4:1999

derrick semipermanent structure, of square or rectangular cross-section, having members that are latticed or trussed on all four sidesNOTE 1 This unit is assembled in the vertical or operation position, as it includes no erection mechanism.NOTE 2 It may or may not be guyed.

ISO 13626:2003

desander hydrocyclone, having an inside diameter of 152 mm (6 in) or larger, that removes a high proportion of the particles of diameter 74 µm and larger from a drilling fluid

ISO 13501:2005

design equipment manufacturer's description of various parameters relevant to the equipmentNOTE This terminology is for use only by the equipment manufacturer and is not intended to appear in the purchaser's specifications.

ISO 10437:2003

design word used by the designer or manufacturer in terms such as, design power, design pressure, design temperature and design speedNOTE Use of this word in the purchaser’s specifications should be avoided.

ISO 13707:2000

design acceptance criteria

defined limits placed on characteristics of materials, products, or services established by the organization, customer, and/or applicable specifications to achieve conformity to the product design[ISO/TS 29001:2003]

ISO 10432:2004


defined limits placed on characteristics of materials, products, or services established by the organization, customer, and/or applicable specifications to achieve conformity to the product design[ISO/TS 29001:2003]

ISO 16070:2005


defined limits placed on characteristics of materials, products, or services established by the organization, customer, and/or applicable specifications to achieve conformity to the product design

ISO/TS 29001:2003

design actions combination of representative actions and partial safety factors representing a design situation for use in checking the acceptability of a design

ISO 19901-4:2003

design basis set of project-specific design data and functional requirements that are not specified or are left open in the general standard

ISO 13628-7:2005

design check assessment of a component for a load case by means of an application rule

ISO 13628-7:2005

design crest elevation extreme crest elevation measured relative to still water levelNOTE The design crest elevation is used in combination with information on astronomical tide, storm surge, platform settlement, reservoir subsidence and water depth uncertainty and is derived from an extreme value analysis. Because of the simplified nature of the models used to estimate the kinematics of the design wave, the design crest elevation can be different from, usually somewhat greater than, the crest elevation of the design wave used to calculate actions on the structure.

ISO 19901-1:2005

design criteria quantitative formulations which describe each failure mode the conditions shall fulfil

ISO 13628-7:2005


design criteria quantitative formulations that describe the conditions to be fulfilled for each limit state

ISO 19900:2002

design criteria quantitative formulations that describe the conditions to be fulfilled for each limit state[ISO 19900:2002]

ISO 19901-7:2005

design external pressure

maximum positive external pressure differential, i.e. external minus internal pressure, intended to be experienced by a component during its service life

ISO 14692-1:2002

design factor factor (usage factor) used in working stress design ISO 13628-7:2005design family group of products whose configurations, sizes, materials and

applications are sufficiently similar that identical design methodologies can be used to establish the design parameters for each product within the family

ISO 17078-1:2004

design life service life multiplied by an appropriate safety factor ISO 13628-5:2002design life period for which a riser can be used for its intended purpose

with anticipated maintenance but without substantial repair or replacement being necessary including storage and working periodsNOTE The design life includes the entire period from start of manufacture to condemnation of the C/WO riser system or part of the system.

ISO 13628-7:2005

design life tDL

operating time used as a basis for tube designNOTE The design life is not necessarily the same as the retirement or replacement life.

ISO 13704:2001

design load sum of static and dynamic loads that would induce the maximum allowable stress in an item

ISO 13535:2000

design load force or combination of forces which a structure is designed to withstand without exceeding the allowable stress in any member

ISO 13626:2003

design load combination of load effects ISO 13628-7:2005design load sum of the static and dynamic loads that would induce the

maximum allowable stress in the equipmentISO 14693:2003

design material strength

stress used for structural strength calculation ISO 13628-7:2005

design metal temperatureTd

tube metal, or skin, temperature used for designNOTE This is determined by calculating the maximum tube metal temperature (Tmax in annex B in original document) or the equivalent tube metal temperature (Teq in 2.7 in original document) and adding an appropriate temperature allowance (see 2.15 in original document). A procedure for calculating the maximum tube metal temperature from the heat flux density is included in annex B in original document. When the equivalent tube metal temperature is used, the maximum operating temperature can be higher than the design metal temperature.

ISO 13704:2001

design method method, procedure or equations used by the supplier/manufacturer to design a side-pocket mandrel product

ISO 17078-1:2004

design methodology verification report

evaluation report prepared by an independent verification agent at the time of an initial review, for a specific manufacturer, confirming the suitability and appropriate limits of the manufacturer’s design methodologiesNOTE The design methodology verification report may include occasional amendments or revisions to address the exceeding of previous limits or changes in methodologies.

ISO 13628-2:2000

design minimum temperature

lowest temperature, at the mid-thickness of the piping wall, expected in service

ISO 15649:2001

design pressure minimum or maximum pressure, inclusive of operating pressure, surge pressure including shut-in pressure where

ISO 13628-10:2005


applicable, vacuum conditions and static pressure headdesign pressure minimum or maximum pressure, inclusive of operating

pressure, surge pressure including shut-in pressure and, if applicable, vacuum conditions and static pressure head

ISO 13628-2:2000

design pressurerated working pressure

pressure which is equal to or greater than the maximum service conditions, and for which all components are rated

ISO 13628-6:2000

design pressure maximum difference between internal pressure and external pressure that is unlikely to be exceeded during the life of the riser, referred to a specified reference heightNOTE Design pressure is often named maximum allowable pressure or rated working pressure or maximum allowable.EXAMPLE Design pressure is the maximum pressure considering shut-in pressure at the wellhead (seabed) or at the top of the riser with subsea valves open, maximum well fracturing pressure, maximum well injection pressure, maximum surge pressure or maximum well kill pressure.

ISO 13628-7:2005

design pressure maximum positive internal pressure differential, i.e. internal minus external pressure, intended to be experienced by a component during its service life

ISO 14692-1:2002

design pressure pressure used in calculating the thickness and the rating of piping components

ISO 15649:2001

design process process of converting the requirements of the functional specification into the technical specification

ISO 13880:1999

design review documented, comprehensive and systematic examination of a design to evaluate its capability to fulfill requirements for quality, identify problems and propose the development of solutionsNOTE 1 In the context of this International Standard, the basis for the design review is the functional specification.NOTE 2 A service is also designed, and can be reviewed in the same manner.

ISO 13880:1999

design review formal, documented, comprehensive and systematic examination of a design to evaluate the design requirements and the capabilities of the design to meet these requirementsNOTE 1 In the context of the document, the acceptance criteria for the design review are defined in the functional and technical specifications (see ISO 13879 and ISO 13880).NOTE 2 A service is also designed and can be reviewed in the same manner.

ISO/TR 13881:2000

design safety factor factor to account for a certain safety margin between the maximum allowable stress and the specified minimum yield strength of a material

ISO 13535:2000

design safety factor factor to account for a certain safety margin between the maximum allowable stress and the minimum specified yield strength of the material

ISO 14693:2003

design service life assumed period for which a structure is to be used for its intended purpose with anticipated maintenance, but without substantial repair being necessary

ISO 19900:2002

design service life assumed period for which a structure or a structural component is to be used for its intended purpose with anticipated maintenance, but without substantial repair being necessaryNOTE Adapted from ISO 19900:2002, definition 2.12.

ISO 19901-7:2005

design situation set of physical conditions representing real conditions during a certain time interval for which the design will demonstrate that relevant limit states are not exceeded

ISO 19900:2002

design situation set of physical conditions during a certain reference period for which the design will demonstrate that relevant limit states are

ISO 19901-7:2005


not exceededNOTE Adapted from ISO 19900:2002, definition 2.13.

design temperature for each design condition, maximum fluid temperature that can be reached during service

ISO 14692-1:2002

design temperature maximum temperature likely to be reached in operation, at the mid-thickness of the nominal piping wall, at design pressure

ISO 15649:2001

design validation process of proving a design by testing to demonstrate conformity of the product to design requirements[ISO/TS 29001:2003]

ISO 10432:2004

design validation process of proving the packer or bridge plug design by a test to demonstrate conformance of the product to one of the design validation grades.NOTE Six standard design validation grades (V6 to V1) are specified in 6.5 and one special design validation grade (V0) specified in annex A. (in original document).

ISO 14310:2001

design validation process of proving a design by testing to demonstrate conformity of the product to design requirements[ISO/TS 29001:2003]

ISO 16070:2005

design validation process of proving a design by testing to demonstrate conformity of the product to design requirements[ISO/TS 29001:2003]NOTE See also 5.7.

ISO 17078-1:2004

design validation process of proving a design by testing to demonstrate conformity of the product to design requirements.

ISO/TS 29001:2003

design value value derived from the representative value for use in the design verification procedure

ISO 19900:2002

design verification process of examining the result of a given design or development activity to determine conformity with specified requirements[ISO/TS 29001:2003]

ISO 10432:2004

design verification activities performed at appropriate stages of process output which ensure that the end product conforms to the supplier's/manufacturer's technical specificationNOTE These activities are described in 6.4. (in original document).

ISO 14310:2001


ISO 16070:2005


ISO 17078-1:2004

design verification process of examining the result of a given design or development activity to determine conformity with specified requirements

ISO/TS 29001:2003

design verification test test performed to validate the integrity of the design calculations used

ISO 13535:2000

design verification test test undertaken to validate the integrity of the design calculations used

ISO 14693:2003

design wave deterministic wave used for the design of an offshore structureNOTE 1 The design wave is an engineering abstract. Most often it is a periodic wave with suitable characteristics (e.g. height H, period T, steepness, crest elevation). The choice of a design wave depends on the design purpose(s) considered, the wave environment,

ISO 19901-1:2005


the geometry of the structure, the type of action(s) or action effect(s) pursued.NOTE 2 Normally, a design wave is only compatible with design situations in which the action effect(s) are quasi-statically related to the associated wave actions on the structure.

design working load maximum working load multiplied by an appropriate safety factor

ISO 13628-5:2002

design working pressureDWP

maximum working pressure at which a hose or tube is rated for continuous operation

ISO 13628-5:2002

designer individual or organization that takes the responsibility for the design of C/WO riser systems conforming with requirements of this part of ISO 13628

ISO 13628-7:2005

designer party which carries out all or part of the design for a project or facility

ISO 14692-1:2002

designer individual or organization that takes responsibility for the engineering design of piping in accordance with any requirements established by the owner and in accordance with this International Standard

ISO 15649:2001

desilter hydrocyclone having an inside diameter less than 152 mm (6 in)

ISO 13501:2005

detectable abnormal condition

abnormal operating condition which can be detected by a sensor

ISO 10418:2003

detectordetector shoe

scanning shoe carrying one or more transducers, used to protect transducers from mechanical damage

ISO 15463:2003

device positionnormally open

de-energized position of a device (e.g. automatically controlled electric switch or valve) remaining in an open position during operation unless energizedNOTE During operation of the equipment, the positions of these devices are not necessarily the same as their on-the- shelf positions.

ISO 10438-1:2003

device positionnormally closed

de-energized position of a device (e.g. automatically controlled electric switch or valve) remaining in a closed position during operation unless energizedNOTE During operation of the equipment, the positions of these devices are not necessarily the same as their on-the-shelf positions.

ISO 10438-1:2003

diametral crown clearance

clearance between the crown diameter of the external teeth and the root diameter of the mating internal teeth when the coupling is in perfect alignment

ISO 10441:1999

differential scanning calorimetryDSC

method for determining the glass transition temperature of a polymer

ISO 14692-1:2002

digital simulation method using various mathematical techniques on digital computers to achieve the acoustic simulation (see 3.1 in original document)

ISO 13707:2000

dilution method of decreasing the drilled-solids content of a slurry by addition of a material(s) other than drilled solids, usually a clean drilling fluid

ISO 13501:2005

dilution factor ratio of the actual volume of clean drilling fluid required to maintain a targeted drilled-solids concentration to the volume of drilling fluid required to maintain the same drilled-solids fraction over the same specified interval of footage with no drilled-solids removal system

ISO 13501:2005

direct air preheater heat exchanger which transfers heat directly between the flue gas and the combustion airNOTE A regenerative air preheater uses heated rotating elements and a recuperative design uses stationary tubes, plates, or cast iron elements to separate the two heating media.

ISO 13705:2001


direct hydraulic control control method wherein hydraulic pressure is applied through an umbilical line to act directly on a subsea valveactuatorNOTE Upon venting of the pressure at the surface, the control fluid is returned through the umbilical to the surface due to the action of the restoring spring in the valve actuator. Subsea functions may be ganged together to reduce the number of umbilical lines.

ISO 13628-6:2000

direct ignition source any source with sufficient energy to initiate combustion ISO 10418:2003direct-acting pump reciprocating pump consisting of a piston-powered drive end

connected directly to a liquid end to which power is directly transmitted by the action of the motive fluid on the pistonNOTE A direct-acting pump can use steam, air, or gas as the motive fluid.

ISO 13710:2004

directional combination combination of response values due to each of the three orthogonal components of an earthquake motion

ISO 19901-2:2004

discontinuityflawimperfection

irregularity in the product, such as a lap, seam, pit and lamination

ISO 15463:2003

displacement volume of fluid pumped in one revolution of the rotor in the stator

ISO 15136-1:2001

displacement weight of the volume of water displaced by a floating structure, which is the sum of lightweight and deadweight

ISO 19901-5:2003

displacement ventilation

movement of air within a space in piston- or plug-type motionNOTE No mixing of room air occurs in ideal displacement flow, which is desirable for removing pollutants generated within a space.

ISO 15138:2000

disposition action taken in accordance with the applicable specification with regard to a defect in a length of OCTG

ISO 15463:2003

distributed flush system

arrangement of holes, passages, baffles, etc., designed to promote an even distribution of flush fluid around the circumference of the seal faces, qualified by testing in accordance with this International Standard

ISO 21049:2004

diverter device used to direct tools at a branch connectionNOTE Used generically, it refers to that category of equipment which includes deflectors, diverters and selectors.

ISO 13628-3:2000

DN alphanumeric designation of size for components of a pipework system, which is used for reference purposes, comprising the letters DN followed by a dimensionless whole number which is indirectly related to the physical size, in millimetres, of the bore or outside diameter of the end connections[ISO 6708:1995, definition 2.1]

ISO 10434:2004

DN alphanumeric designation of size for components of a pipework system, which is used for reference purposes, comprising the letters DN followed by a dimensionless whole number which is indirectly related to the physical size, in millimetres, of the bore or outside diameter of the end connections[ISO 6708:1995, definition 2.1]

ISO 17292:2004

dogleg change in well bore inclinationNOTE The “severity” of the dogleg is proportional to the change in inclination, typically measured in degrees.

ISO 17078-1:2004

dog-type coupling coupling having dogs which act as wedges mechanically driven between the box and pin for engagement

ISO 13625:2002

double casing type of pump construction in which the pressure casing is separate from the pumping elements contained in the casingNOTE Examples of pumping elements include diffuser, diaphragms, bowls and volute inner casings.

ISO 13709:2003


double seam combination gas metal arc- and submerged arc-welded pipe:

Pipe having two longitudinal seams produced by a combination of the welding processes defined in 3.2.1.2 (a) and 3.2.1.2 (b) .

ISO 3183-1:1996

double seam gas metal arc-welded pipe:

Pipe having two longitudinal seams produced by the gas metal arc-welding process defined in 3.2.1.2 (b).

ISO 3183-1:1996

double seam submerged-arc welded pipe:

Pipe having two longitudinal seams produced by the automatic submerged-arc welding process defined in 3.2.1.2 (a).

ISO 3183-1:1996

double-block-and-bleed (DBB) valve

valve with two seating surfaces which, in the closed position, blocks flow from both valve ends when the cavity between the seating surfaces is vented through a bleed connection provided on the body cavity

ISO 14313:1999

double-block-and-bleed valve

valve with two seating surfaces which, in the closed position, blocks flow from both valve ends when the cavity between the seating surfaces is vented through a bleed connection provided on the body cavity[ISO 14313:1999]

ISO 14723:2001

double-engagement coupling

coupling with two planes of flexureNOTE This arrangement enables couplings of certain types, notably gear and metallic flexible-element types, which cannot normally accommodate parallel (or lateral) offset, to do so.

ISO 10441:1999

double-engagement coupling

coupling with two planes of flexureNOTE This arrangement enables couplings of certain types, notably gear and metallic flexible-element types, which cannot normally accommodate parallel (or lateral) offset, to do so.

ISO 14691:1999

down state state of an item characterized either by a fault or by a possible inability to perform a required function duringpreventive maintenance[IEC 60050-191:1990]

ISO 14224:1999

down time time interval during which an item is in a down state[IEC 60050-191:1990]NOTE For more specific information, refer to Figure 191-10 "Maintenance time diagram" in IEC 60050-191.

ISO 14224:1999

downstream direction of movement away from the reservoir ISO 13628-4:1999downstream direction away from the source of pressure or flow ISO 13628-6:2000drain point location of the negative cable connection to the protected

structure through which the protective current returns to its source

ISO 15589-1:2003

drained condition condition whereby the applied stresses and stress changes are supported by the soil skeleton and do not cause a change in pore pressure

ISO 19901-4:2003

draught negative pressure (vacuum) of the air and/or flue gas measured at any point in the heater

ISO 13705:2001

draught loss pressure drop (including buoyancy effect) through duct conduits or across tubes and equipment in air and flue gas systems

ISO 13705:2001

drift gauge used to check minimum internal diameter of drill stem components

ISO 10424-1:2004

drift gauge used to check the minimum radius of curvature and minimum ID of loops, flowline and nipples

ISO 13628-3:2000

drift cylindrical mandrel for verifying drift diameter of individual and assembled equipment

ISO 13628-7:2005

drift diameter minimum ID of a packer, expressed as the OD of the drift bar utilized during assembly verification, as outlined in 7.4.11 in original document.

ISO 14310:2001

drift mandrel cylinder, machined to specified dimensions, that is passed through a pipe to locate obstructions and/or to assess

ISO 15463:2003


compliance with the appropriate specificationsdrift outside diameter tube's ID through which all elements of the assembled side-

pocket mandrel can passISO 17078-1:2004

drift-off unintended lateral movement of a dynamically positioned vessel off its intended location relative to the wellhead, generally caused by loss of station-keeping control or propulsion

ISO 13628-7:2005

drill collar thick-walled pipe used to provide stiffness and concentration of mass at or near the bit

ISO 10424-1:2004

drill pipe length of tube, usually steel, to which special threaded connections called tool joints are attached

ISO 10424-1:2004

drill pipe Heavy seamless pipe used to rotate bit and circulate the drilling mud; these pipe are coupled together by means of tool joints.

ISO 11961:1996

drill pipe seamless pipe used to rotate the drill bit and circulate the drilling mud, pipes being coupled together by means of tool joints

ISO 15546:2002

drill pipe riser single string of drill pipe with an attached hydraulic control umbilical and annulus umbilical

ISO 13628-7:2005

drilled solids formation solids which enter the drilling-fluid system, whether produced by the drill bit or from the side of the borehole

ISO 13501:2005

drilled-solids fraction average volume fraction of drilled solids maintained in the drilling fluid over a specified interval of footage

ISO 13501:2005

drilled-solids removal system

all equipment and processes used while drilling a well that remove the solids generated from the hole and carried by the drilling fluidNOTE These processes include settling, screening, desanding, desilting, centrifuging and dumping.

ISO 13501:2005

drilled-solids removal system performance

measure of the removal of drilled solids by surface solids-control equipmentNOTE The calculation is based on a comparison of the dilution required to maintain the desired drilled-solids content, with that which would have been required if none of the drilled solids were removed.

ISO 13501:2005

drilling fluid any liquid or slurry pumped down the drill string and up the annulus of a hole during the drilling operation

ISO 13501:2005

drilling riser system used with floating drilling vessel for guiding the drill string and circulating fluids between the drilling vessel and the subsea BOP

ISO 13628-7:2005

drilling spool pressure-containing piece of equipment having end connections, used below or between drill-through equipmentNOTE When outlet connections are provided, they shall be manufactured in accordance with this International Standard.

ISO 13533:2001

drip tray tray that is able to collect droplets from an entire heat exchanger plate pack

ISO 15547-1:2005

drive collar external part of the seal cartridge that transmits torque to the seal sleeve and prevents axial movement of the seal sleeve relative to the shaft

ISO 21049:2004

drive string device transmitting power (usually sucker rods) between the drivehead and the PCP

ISO 15136-1:2001

drive train all parts of a valve drive between the operator and the obturator, including the obturator but excluding the operator

ISO 14313:1999

drive train all parts of a valve drive between the operator and the obturator, including the obturator but excluding the operator[ISO 14313:1999]

ISO 14723:2001

drive train component item of the equipment used in series to drive the pumpEXAMPLES Motor, gear, turbine, engine, fluid drive, clutch.

ISO 13709:2003


drive-off unintended movement of a dynamically positioned vessel off location driven by the vessel's main propulsion or station-keeping thrusters

ISO 13628-7:2005

dry critical speed rotor critical speed calculated assuming that there are no liquid effects, that the rotor is supported only at its bearings and that the bearings are of infinite stiffness

ISO 13709:2003

dry weight weight of a component, weight item or an assembly in its dry installed condition including permanent utilitiesNOTE 1 Examples of permanent utilities are gearbox oil, hydraulic oil, filter sand, etc.NOTE 2 Any content of operating fluid flowing through a component, weight item or an assembly is excluded.

ISO 19901-5:2003

dual mechanical seal Arrangement 2 or Arrangement 3 seal of any kind ISO 21049:2004dual-element transducer

ultrasonic transducer containing two piezoelectric elements, one for transmitting and one for receiving

ISO 15463:2003

duct conduit for air or flue gas flow ISO 13705:2001ductile cast ironnodular cast iron

cast iron that has been treated while molten with an element (usually magnesium or cerium) that spheroidizes the graphite

ISO 15156-2:2003

duplex stainless steelaustenitic/ferritic stainless steel

stainless steel whose microstructure at room temperature consists primarily of a mixture of austenite and ferrite

ISO 15156-3:2003

dynamic action action that induces acceleration of a structure or a structural component of a magnitude sufficient to require specific consideration

ISO 19901-7:2005

dynamic application service in which flexible pipe is exposed to cyclically varying loads and deflections during normal operationNOTE The pipe is specially constructed to withstand a large number of bending/tensile/torsional cycles.

ISO 13628-10:2005

dynamic application application in which the flexible pipe is exposed to cyclically varying loads and deflections during normal operationNOTE The pipe is specially constructed to withstand a large number of bending, tensile and torsional cycles.

ISO 13628-2:2000

dynamic level fluid level under standard conditions of temperature and pressure when the PCP is in operationNOTE Standard conditions, unless otherwise indicated, are 15 °C and 0,101 3 MPa.

ISO 15136-1:2001

dynamic load load applied to the equipment due to acceleration effects ISO 13535:2000dynamic load load applied to the equipment due to acceleration effects ISO 14693:2003dynamic loading loading imposed upon a structure as a result of motion ISO 13626:2003dynamic mechanical thermal analysisDMTA

method for determining the glass transition temperature of a polymer or FRP (2.2.33) component

ISO 14692-1:2002

dynamic positioning computerized means of maintaining a vessel on location by selectively activating thrusters

ISO 13628-7:2005

dynamic positioningDP

stationkeeping technique consisting primarily of a system of automatically controlled on-board thrusters, which generate appropriate thrust vectors to counter the mean and slowly varying induced actions

ISO 19901-7:2005

dynamic seal seal in which motion exists relative to the sealing surface after installation

ISO 10423:2003

dynamic sealing-pressure rating

highest pressure differential that the seal or seal assembly can continuously withstand at the maximumallowable temperature while the shaft is rotatingNOTE Thereafter, the seal retains its static sealing pressure rating.

ISO 21049:2004

earth, verb, GBground, verb, US

provide electrical contact with earth ISO 14692-1:2002

eddy current circulating current caused to flow in the OCTG by varying ISO 15463:2003


magnetic fieldseductor fluid stream device utilizing a fluid stream discharging under

high pressure from a jet through an annular space to create a low pressure regionNOTE When properly arranged, it can evacuate degassed drilling fluid from a vacuum-type degasser or pull solids through a hopper.

ISO 13501:2005

eductor pressure jet device using a high velocity jet to create a low pressure region (Bernoulli Principle) which draws liquid or dry material to be blended with the drilling fluid

ISO 13501:2005

effective foundation area

reduced foundation area having its geometric centre at the point where the resultant action vector intersects the foundation base level

ISO 19901-4:2003

effective surface outside surface area of the tubes that contributes to heat transfer

ISO 16812:2002

effective tension axial tension calculated at any point along a riser by considering only the top tension and the apparent weight of the riser and its contents (tension positive)NOTE Global buckling and geometric stiffness is governed by the effective tension.

ISO 13628-7:2005

effluent discharge of liquid, generally a stream, after some attempt at separation or purification has been made

ISO 13501:2005

E-glass glass fibre normally used to reinforce GRP (2.2.48) pipes, consisting mainly of SiO2, Al2O3 and MgO

ISO 14692-1:2002

elastic allowable stressσel

allowable stress for the elastic range (see 5.2 in original document)NOTE See 3.2.3 in original document for information about tubes that have longitudinal welds.

ISO 13704:2001

elastic design pressure pel

maximum pressure that the heater coil will sustain for short periods of timeNOTE This pressure is usually related to relief valve settings, pump shut-in pressures, etc.

ISO 13704:2001

elasticity capability of a material to regain its original shape and condition upon removal of an acting stress

ISO 13503-1:2003

elastomer material that substantially recovers its original shape and size at room temperature after removal of a deforming force; material that shows a reversible elasticity up to a very high strain level (~ 100 %)

ISO 13628-10:2005

elastomeric bell-and-spigot seal lock joint

rubber seal lock jointrubber sealed key lock jointjoint connection made up of a spigot end and a socket end with “O” or lip-sealing rings

ISO 14692-1:2002

elastomeric compression coupling

type of elastomeric flexible-element coupling in which elastomeric inserts are located between adjacent parts of the driving and driven halves of the coupling and are principally loaded in compressionNOTE 1 The inserts are often in the form of bushes or wedges, or one single insert.NOTE 2 The ability of such couplings to accommodate misalignment, particularly of the parallel (or lateral) offset type, is limited.

ISO 10441:1999

elastomeric compression coupling

coupling in which elastomeric inserts, often in the form of bushes or wedges or one single insert, are located between adjacent parts of the driving and driven halves of the coupling and are principally loaded in compressionNOTE The ability of such couplings to accommodate misalignment, particularly of the parallel offset type, is limited.

ISO 14691:1999

elastomeric flexible- coupling in which the torque is transmitted through one or ISO 10441:1999


element coupling several elastomeric elementselastomeric flexible-element coupling

a coupling in which the torque is transmitted through one or several elastomeric elementsNOTE This category includes elastomeric shear (3.1.3.1 in original document) and elastomeric compression (3.1.3.2 in original document) couplings.

ISO 14691:1999

elastomeric shear coupling

type of elastomeric flexible-element coupling in which the torque is transmitted through an elastomeric element which is principally loaded in shearNOTE 1 The element may be in the form of a tyre, a bellows (with one or more convolutions) or a diaphragm.NOTE 2 A single such elastomeric element is usually able to accommodate angular misalignment, parallel offset and axial displacement.

ISO 10441:1999

elastomeric shear coupling

coupling in which the torque is transmitted through an elastomeric element which is principally loaded in shearNOTE The element may be in the form of a tyre, a bellows (with one or more convolutions) or a diaphragm. A single such elastomeric element is usually able to accommodate angular misalignment, parallel offset and axial displacement.

ISO 14691:1999

electric field gradient change in electrical potential per unit distance through a conductive medium, arising from the flow of electric current

ISO 15589-2:2004

electrically conductiveconductive

having a volume resistivity equal to or lower than 104 Ωm ISO 14692-1:2002

electrically insulated coupling

coupling designed to prevent the flow of electrical current from one shaft to the other through the coupling

ISO 10441:1999

electrically insulated coupling

coupling designed to prevent the flow of electrical current from one shaft to the other through the coupling

ISO 14691:1999

electric-weld: Longitudinal seam weld produced by the electric-welding process defined in 3.2.1.1 (b).

ISO 3183-1:1996

electric-welded pipe pipe having one longitudinal seam formed by electric-resistance or electric-induction welding, without the addition of filler metal, wherein the edges to be welded are mechanically pressed together and the heat for welding is generated by the resistance to flow of electric current

ISO 11960:2004

electric-welded pipe: Pipe having one longitudinal seam produced by the electric-welding process defined in 3.2.1.1 (b).

ISO 3183-1:1996

electrochemical capacity

total amount of electricity that is produced when a fixed mass (usually 1 kg) of anode material is consumedelectrochemicallyNOTE It is expressed in ampere hours.cf. electric field gradient (3.5)

ISO 15589-2:2004

electrohydraulic control control method wherein electrical signals are conducted to the subsea system and used to open or close electrically-controlled hydraulic control valvesNOTE Hydraulic fluid is locally sourced and acts on the associated subsea valve actuator. "Locally sourced" may mean locally stored pressurized fluid or fluid supplied by a hydraulic umbilical line. With electrohydraulic control systems, data telemetry (readback) is readily available at high speed. Multiplexing of the electrical signals reduces the number of conductors in the electrical umbilical.

ISO 13628-6:2000

electromagnetic inspectionEMI

primarily the eddy-current and flux-leakage methods used to detect imperfectionsNOTE Field electromagnetic "Inspection Systems" sometimes include equipment for performing additional inspections or services.

ISO 15463:2003

electrostatic dissipativeconductive

having a volume resistivity higher than 104 Ωm but lower than 109 Ωm or a surface resistivity less than 1010 Ωmeasured at ambient temperature and 50 % relative humidity

ISO 14692-1:2002


elementbundle

assembly of the rotor plus the internal stationary parts of a centrifugal pump

ISO 13709:2003

embarkation area place from which personnel leave the installation during evacuationEXAMPLES A helideck and associated waiting area or a lifeboat/liferaft boarding area.

ISO 13702:1999

embarkation area place from which personnel leave the installation during evacuationEXAMPLES A helideck and associated waiting area or a lifeboat/liferaft boarding area.

ISO 15544:2000

embedding compound elastomeric compound in which the steel reinforcing cables are embeddedNOTE The compound assures bonding between the steel cables and surrounding layers.

ISO 13628-10:2005

emergency hazardous event which cannot be handled by normal measures and requires immediate action to limit its extent, duration or consequences

ISO 15544:2000

emergency command centre

location from which the person in overall charge coordinates ER activities

ISO 15544:2000

emergency depressurizationEDP

controlled disposal of pressurized fluids to a flare or vent system when required to avoid or minimize a hazardous situation

ISO 13702:1999

emergency disconnect package

subsea equipment package that typically forms part of the lower workover riser package and provides a disconnection point between the riser and subsea equipmentNOTE This equipment is used when it is required to disconnect the riser from the well, typically in case of a vessel drift-off or other emergency that could move the vessel away from the well location.

ISO 13628-7:2005

emergency oil pump separate oil pump that provides adequate pressure and capacity to permit safe shutdown of the equipment when the main and standby pumps are inoperable

ISO 10438-1:2003

emergency quick-disconnect

automatic activation of an emergency shutdown followed by an automatic disconnect of the riser

ISO 13628-7:2005

emergency response action taken by personnel on or off the installation to control or mitigate a hazardous event or initiate and execute abandonment

ISO 13702:1999

emergency responseER

action taken by personnel on or off the installation to control or mitigate a hazardous event or initiate and execute abandonment

ISO 15544:2000

emergency response arrangement

plant and equipment provided for use under emergency conditions

ISO 15544:2000

emergency response measure

anything provided to facilitate the management of an emergencyNOTE This is a generic term which includes emergency response arrangements, as well as the planning, procedural and organizational aspects of managing emergencies.

ISO 15544:2000

emergency response team

group of personnel who have designated duties in an emergency

ISO 13702:1999

emergency response team

group of personnel who have designated responsibilities in an emergency for the safety of the installation, the safety of others or for environmental protection

ISO 15544:2000

emergency shutdown controlled sequence of events that ensures that the well is secured against accidental release of hydrocarbons into the environment, i.e. closing of barrier elements

ISO 13628-7:2005

emergency shutdownESD

control actions undertaken to shut down equipment or processes in response to a hazardous situation

ISO 13702:1999

emergency shutdown system of stations which, when activated, initiate facility ISO 10417:2004


system shutdownemergency shutdown systemESD system

system, activated by automatic or manual signals, which undertakes the control actions to shut down equipment or processes in response to a hazardous situation

ISO 10418:2003

emergency station place where emergency response personnel go to undertake their emergency duties

ISO 13702:1999

emergency station place to which emergency response personnel go to undertake their emergency duties

ISO 15544:2000

end connectionoutlet connection

integral male or female thread; hub end connector and flange, studded or through-bolted, or any other means usedto join together equipment that contains or controls pressure

ISO 10423:2003

end connection thread or other mechanism providing equipment-to-tubular interface

ISO 10432:2004

end connection flange (studded or open-face), hub connection or other end connection (see 3.47 original document) used to join together equipment and integral to that equipment

ISO 13533:2001

end connection thread or other mechanism connecting the packer or bridge plug to the conduit

ISO 14310:2001

end connection thread(s) on the side-pocket mandrel end(s) used to attach the side-pocket mandrel to the tubing string

ISO 17078-1:2004

end fitting mechanical device which forms the transition between the flexible pipe body and the connectorNOTE The different pipe layers are terminated in the end fitting in such a way as to transfer the load between the flexible pipe and the connector.

ISO 13628-10:2005

end fitting mechanical device which forms the transition between the flexible pipe body and the connectorNOTE The different pipe layers are terminated in the end fittings in such a way as to transfer the load between the flexible pipe and the connectors.

ISO 13628-2:2000

end plate plate which prevent the fluids in a plate-and-frame heat exchanger from contacting the fixed and removable coversNOTE There are two end plates, one at each end of the plate-and-frame heat exchanger.

ISO 15547-1:2005

end termination mechanical fitting attached to the end of an umbilical which provides a means of transferring installation and operating loads, fluid and electrical services to a mating assembly mounted on the subsea facility or surface facility

ISO 13628-5:2002

environment set of conditions to which the product is exposed ISO 10432:2004environment surroundings in which an organization operates, including air,

water, land, natural resources, flora, fauna, humans and their interrelation

ISO 17776:2000

environmental impact any change to the environment, whether adverse or beneficial, wholly or partially resulting from an organization’s activities, products or services

ISO 17776:2000

environmental loads loads due to the environmentEXAMPLES Waves, current and wind.

ISO 13628-7:2005

environmental seal outermost pressure-containing seal at a connector interfaceNOTE This seal normally separates a pressurized medium from the surrounding environment.

ISO 13628-7:2005

environmental service class

category of environmental conditions for which the side-pocket mandrel product is designed to be usedNOTE See also 5.6.

ISO 17078-1:2004

environmental stress crackingESC

formation of cracks in a polymer or composite caused by exposure to a chemical or environment under stress

ISO 14692-1:2002


epoxideepoxy

compound containing at least two epoxy or oxirane ringsNOTE 1 Chemically, an epoxy ring is a three-membered ring containing two carbon atoms and one oxygen atom.NOTE 2 The most widely used epoxy resin is termed DGEBA (diglycidyl ether of bisphenol A). Epoxy resins are always used in conjunction with curing agents or hardeners, i.e. substances that react with the epoxy rings, producing hydroxyl groups and other products, and linking the originally linear molecules into a rigid three-dimensional network.

ISO 14692-1:2002

equalizer opening for flow between compartments in a surface fluid-holding system which allows all compartments to maintain the same fluid level

ISO 13501:2005

equalizing feature SSSV mechanism which permits the well pressure to bypass the SCSSV closure mechanism

ISO 10417:2004

equipment any item or assembled equipment to which this International Standard is applicable

ISO 10423:2003

equipment main machinery served by the oil or gas system ISO 10438-1:2003equipment any single completed unit that can be used for its intended

purpose without further processing or assemblyISO 13533:2001

equipment component, or arrangement of components, built for specific function(s)NOTE The component/assembly normally has unique documentation due to its function and complexity.

ISO 19901-5:2003

equipment class class of equipment unitsEXAMPLE All pumps.NOTE For well-completion equipment, see additional information in A.4.5. in original document

ISO 14224:1999

equipment unit specific equipment unit within an equipment class as defined within the main boundaryEXAMPLE A pump.

ISO 14224:1999

equipment unit redundancy

(on the equipment unit level) existence of more than one means for performing the required functionEXAMPLE 3 x 50 %.

ISO 14224:1999

equivalent roundER

standard for comparing various shaped sections to round bars, in determining the response to hardening characteristics when heat-treating low alloy and martensitic corrosion-resistant steel

ISO 10423:2003

equivalent roundER

standard for comparing variously shaped sections to round bars, used in determining the response to hardening characteristics when heat-treating low-alloy and martensitic corrosion-resistant steels

ISO 14693:2003

equivalent sack mass of the blend of Portland cement and fly ash or pozzolan that has the same absolute volume as 42,63 kg (94 lbs) of Portland cement

ISO 10426-2:2003

equivalent tube metal temperatureTeq

calculated constant metal temperature that in a specified period of time produces the same creep damage as does a linearly changing metal temperature (see 4.8 in original document)

ISO 13704:2001

equivalent-round standard for comparing various shaped sections to round bars, used for determining the response to hardening characteristics when heat-treating low-alloy and martensitic corrosion-resistant steels

ISO 13535:2000

erection load load produced in the mast and its supporting structure during its raising and lowering, or in the substructure during its raising and lowering

ISO 13626:2003

erosion reduction in material thickness due to mechanical attack from a fluid

ISO 13705:2001

escalation spread of impact from fires, explosions, toxic gas releases to ISO 13702:1999


equipment or other areas thereby causing an increase in the consequences of a hazardous event

escalation increase in the consequences of a hazardous event ISO 15544:2000escalation spread of the impact of a hazardous event to equipment or

other areas, thereby causing an increase in the consequences of the event

ISO 17776:2000

escape act of personnel moving away from a hazardous event to a place where its effects are reduced or removed

ISO 13702:1999

escape act of personnel moving away from a hazardous event to a place where its effects are reduced or removed

ISO 15544:2000

escape and evacuation systems

systems provided on a platform to facilitate escape and evacuation in an emergencyNOTE Escape and evacuation systems include passageways, chutes, ladders, life rafts and helidecks.

ISO 19901-2:2004

escape route route from an area of an installation leading to a muster area, temporary refuge (TR), embarkation area or means of escape to the sea

ISO 13702:1999

escape route route leading to the place where people muster, or to an area from which people may leave the installation in an emergency

ISO 15544:2000

essential safety system any system which has a major role in the control and mitigation of fires and explosions and in any subsequent EER activities

ISO 13702:1999

essential safety system system which has a major role in the control and mitigation of a hazardous event and in any subsequent evacuation, escape and rescue activities

ISO 15544:2000

evacuation the planned method of leaving the installation in an emergency ISO 13702:1999evacuation planned method of leaving the installation in an emergency ISO 15544:2000evacuation route escape route which leads from the temporary refuge (TR) to

the place(s) used for primary or secondary evacuation from the installation

ISO 13702:1999

evacuation route escape route which leads from the muster area to the place(s) used for primary or secondary evacuation from the installation

ISO 15544:2000

evacuation, escape and rescueEER

general term used to describe the range of possible actions including escape, muster, refuge, evacuation, escape to the sea and rescue/recovery

ISO 13702:1999

evacuation, escape and rescueEER

range of possible actions in an emergencyNOTE Such actions may include escape, muster, refuge, evacuation, escape to the sea and rescue/recovery.

ISO 15544:2000

evacuation, escape and rescue strategyEERS

results of the process that uses information from an evaluation of events which may require EER to determine the measures required and the role of these measures

ISO 13702:1999

evacuation, escape and rescue strategyEERS

strategy that results from an evaluation of events that may require EERNOTE This strategy describes the measures required and their role.

ISO 15544:2000

evaluation process of determining the severity of an imperfection which leads to determining whether the OCTG is acceptable or rejectable against the appropriate specification

ISO 15463:2003

event treeevent tree analysisETA

tree-like diagram used to determine alternative potential scenarios arising from a particular hazardous eventNOTE It can be used quantitatively to determine the probability or frequency of different consequences arising from the hazardous event.

ISO 17776:2000

excess air amount of air above the stoichiometric requirement for complete combustionNOTE Excess air is expressed as a percentage.

ISO 13705:2001

excess temperature in a process component, temperature higher than the rated ISO 10418:2003


working temperatureexpansion bellows corrugated piping device designed to absorb expansion and

contractionISO 13703:2000

expansion bend piping configuration designed to absorb expansion and contraction

ISO 13703:2000

expected value first-order statistical moment of the probability density function for the considered variable that, in the case of a time-dependent parameter, can be associated with a specific reference period

ISO 19901-7:2005

expendable parts parts normally used up or consumed in service,EXAMPLES Seals, gaskets, filters, packing, V-belts, covers, guards, breathers, drains and miscellaneous hardware and fasteners.

ISO 13534:2000

experience factorKe

factor by which the machine rated torque is increased to allow for uncertainties in the determination of the machine rated torque and possible future changes to the application

ISO 10441:1999

exploratory grind, nounprobe grind

grind performed to explore or determine the depth of an imperfection

ISO 15463:2003

exposed bolting bolting that is exposed directly to the sour environment or that is buried, insulated, equipped with flange protectors, or otherwise denied direct atmospheric exposure

ISO 10423:2003

exposed component flow-wetted component, internally wetted component and/or component contacted by well fluid below the packing elementcf. flow-wetted component (see 3.13 in original document), internally wetted component (see 3.18 in original document)

ISO 14310:2001

exposure level classification system used to define the requirements for a structure based on consideration of life safety and of environmental and economic consequences of failureNOTE The method for determining exposure levels are described in ISO 19902[2]. An exposure level 1 platform is the most critical and exposure level 3 the least. A normally manned platform which cannot be reliably evacuated before a design event will be an exposure level 1 platform.

ISO 19900:2002

extended surface heat-transfer surface in the form of fins or studs attached to the heat-absorbing surface

ISO 13705:2001

extension ratio ratio of total outside exposed surface to the outside surface of the bare tube

ISO 13705:2001

extension sub sealing tubular member that provides tree bore continuity between adjacent tree components

ISO 13628-4:1999

external drifting test to observe the unencumbered or unrestricted passage of a side-pocket mandrel having a specific diameter through a drift test tool of specified inside diameter and length

ISO 17078-1:2004

external test pressure differential pressure between the applied external pressure and internal pressure at which a side-pocket mandrel is tested for collapse resistance

ISO 17078-1:2004

external thread thread on the outside surface of OCTG ISO 15463:2003extrados outer curved section of the bend arc ISO 15590-1:2001extrados outer curved section of the elbow

NOTE Adapted from ISO 15590-1:2001.ISO 15590-2:2003

extreme level earthquakeELE

earthquake with a severity which the structure should sustain without major damageNOTE The ELE event is comparable to the extreme environmental event in the design of fixed structures which are described in ISO 19902 and ISO 19903. When exposed to an ELE, a structure is supposed to retain its full capacity for all subsequent conditions.

ISO 19901-2:2004

extreme value design value of a parameter used in ultimate limit state checks, in which a structure's global behaviour is intended to

ISO 19901-1:2005


stay in the elastic rangeNOTE Extreme events have probabilities of the order of 102 per annum.

extrusion gap radial gap between the maximum rated casing ID and the minimum OD immediately adjacent to the packing element

ISO 14310:2001

fabricated assembly grouping of pipe and components assembled as a unit and installed as a subunit of a pipeline system

ISO 13623:2000

fabrication construction of the piping system (and pipeline) on site from either individual components and/or spool piecesNOTE Individual components may be pipes, tees, bends, etc.

ISO 14692-4:2002

fabrication weld weld joining two or more parts ISO 10423:2003fabrication weld weld joining two or more parts ISO 13533:2001fabricator individual or organization that takes the responsibility for the

fabrication of C/WO riser systems conforming with the requirements of this part of ISO 13628

ISO 13628-7:2005

fabricator and/or erector

individual or organization that takes responsibility for the fabrication and/or installation of piping in accordance with the engineering design and in accordance with the requirements of this International Standard

ISO 15649:2001

face-to-back configuration

dual seal in which one mating face is mounted between the two flexible elements and one flexible element is mounted between the two mating seal rings

ISO 21049:2004

face-to-face configuration

dual seal in which both of the mating seal rings are mounted between the flexible elements

ISO 21049:2004

factored qualified pressure

pressure to be used in determining the safe operating envelope of the GRP pipe or piping systemNOTE Factored qualified pressure is based on the qualified pressure and takes account of specific service conditions that could not be considered in the qualification programme, e.g. temperatures other than 65 °C and the effect of exposure to chemical environments other than water.

ISO 14692-1:2002

factored stress hoop stress based on the factored qualified pressure (2.2.29)

ISO 14692-1:2002

factory acceptance testFAT

series of tests carried out on the complete umbilical system after manufacture is complete, to verify the integrity of the umbilical

ISO 13628-5:2002

factory acceptance testFAT

test conducted by the manufacturer to verify that the manufacture of a specific assembly meets all intended functional and operational requirements

ISO 13628-7:2005

fail closed valve actuated valve designed to fail to the closed position ISO 13628-4:1999fail open valve actuated valve designed to fail to the open position ISO 13628-4:1999fail safe mode of operation for control systems

arrangement such that failure of any component or loss of energy supply will not result in unsafe or potentiallyunsafe situations

ISO 13707:2000

fail safe system system which causes the equipment to revert to a permanently safe condition (shutdown and/or depressurized) in the event of a component failure or failure of the energy supply to the system

ISO 10437:2003

fail-closed valve valve which will move to the closed position upon loss of the power medium or signal

ISO 10418:2003

fail-safe term applied to equipment or a system so designed that, in the event of failure or malfunction of any part of the system, devices are automatically activated to stabilize or secure the safety of the operation

ISO 13628-7:2005

fail-safe device device which, upon loss of the control medium, automatically shifts to a safe position

ISO 10417:2004


fail-safe setting depth maximum true vertical depth at which an SCSSV can be set and closed under worst-case hydrostatic conditions

ISO 10417:2004

failure improper performance of a device or equipment item that prevents completion of its design function

ISO 10418:2003

failure any equipment condition that prevents it from performing to the requirements of the functional specification

ISO 10432:2004

failure event causing an undesirable condition, e.g. loss of component or system function, or deterioration of functional capability to such an extent that the safety of the unit, personnel or environment is significantly reducedEXAMPLE Structural failure (excessive yielding, buckling, rupture, leakage) or operational limitations (slick joint protection length, clearance).

ISO 13628-7:2005

failure termination of the ability of an item to perform a required function[IEC 60050-191:1990]

ISO 14224:1999

failure loss of structural integrity and/or transmission of fluid through the wall of a component or a joint

ISO 14692-1:2002

failure cause circumstances during design, manufacture or use which have led to a failure[IEC 60050-191:1990]NOTE Identification of the failure cause normally requires some in-depth investigation to uncover the underlying human or organizational factors as well as the technical cause.

ISO 14224:1999

failure descriptor apparent, observed cause of a failureNOTE As normally reported into the maintenance management system.

ISO 14224:1999

failure load load at which the pipe body or connection will fail catastrophically as in an axial separation, a rupture, large permanent deformation (e.g. buckling or collapse) or massive loss of sealing integrity

ISO 13679:2002

failure mechanism physical, chemical or other process which has led to a failure[IEC 60050-191:1990]

ISO 14224:1999

failure mode observed manner of failure ISO 14224:1999false indication NDT indication that is interpreted to be caused by a condition

other than a discontinuity or imperfectionNOTE False indications are considered non-relevant.

ISO 15463:2003

false rotary component that sits on the drilling rotary and provides a slip profile for single, dual or triple tubing stringsNOTE This allows the workover control system umbilical to feed into the drilling riser without interfering with the slips.

ISO 13628-7:2005

false starting thread circumferential tool mark on a round-thread chamfer that precedes the actual starting thread

ISO 15463:2003

fatigue analysis conventional stress-life fatigue analysis using material S-N curves and specified fatigue design factors

ISO 13628-7:2005

fatigue crack growth analysis

analysis of crack growth from assumed initial defect size under the action of cyclic loadingNOTE Used to determine fabrication inspection requirements and in-service inspection plans.

ISO 13628-7:2005

fault state of an item characterized by inability to perform a required function, excluding such inability during preventive maintenance or other planned actions, or due to lack of external resources[IEC 60050-191:1990]

ISO 14224:1999

fault movement movement occurring on a fault during an earthquake ISO 19901-2:2004fault treefault tree analysis

tree-like diagram based upon the application of “and/or” logic used to identify alternative sequences of hardware faults and

ISO 17776:2000


FTA human errors that result in system failures or hazardous eventsNOTE When quantified, fault trees allow system-failure probability or frequency to be calculated.

ferrite body-centred cubic crystalline phase of iron-based alloys ISO 15156-1:2001ferrite body-centred cubic crystalline phase of iron-base alloys ISO 15156-3:2003ferritic stainless steel stainless steel whose microstructure, at room temperature,

consists predominantly of ferriteISO 15156-3:2003

ferritic steel steel whose microstructure at room temperature consists predominantly of ferrite

ISO 15156-1:2001

ferromagnetic term applied to materials that can be magnetized or strongly attracted by a magnetic field

ISO 15463:2003

FFKM perfluoroelastomerFFKM

chemically resistant O-ring elastomer material suitable for high temperature service

ISO 21049:2004

fibre filamentary material with a finite length that is at least 100 times its diameter and prepared by drawing from a molten bath, spinning or deposition on a substrateNOTE Filaments are usually of extreme length and very small diameter, usually less than 25 µm. Normally, filaments are assembled as twisted (yarn) or untwisted (tow) bundles comprising hundreds of filaments.

ISO 14692-1:2002

fibre-reinforced plasticFRP

plastic-based composite that is reinforced with any type of fibre, not necessarily glass

ISO 14692-1:2002

field changeable design feature that permits alteration of a function after the equipment has been installedNOTE The alteration can be accomplished by the following:a) soldering jumper leads to terminal pins especially provided for this purpose;b) employing circuit-board-mounted switches or potentiometers;c) using a shorting or diode-pin-type matrix board;d) using prewired shorting plugs;e) using authorized controlled access.

ISO 10437:2003

field end pipe end opposite the internally-threaded endNOTE Mill identification is at the internally-threaded end.

ISO 15463:2003

filament winding process for fabricating a composite structure in which continuous reinforcements, e.g. fibre tows, are either previously impregnated with a matrix material or impregnated during the winding

ISO 14692-1:2002

filtrate liquid that is forced out of a cement slurry during a fluid loss test

ISO 10426-1:2005

filtrate liquid that is forced out of a cement slurry during a fluid loss test

ISO 10426-2:2003

final current density estimated current density at the end of the lifetime of the pipeline

ISO 15589-2:2004

finite element analysis numerical method for analysing dynamic and static response, by dividing the structure into small continuous elements with the given material propertiesNOTE The analysis can be local or global.

ISO 13628-7:2005

finned surface of a tube total area of the outside surface exposed to air ISO 13706:2005fire and explosion strategyFES

results of the process that uses information from the fire and explosion evaluation to determine the measures required to manage these hazardous events and the role of these measures

ISO 13702:1999

fire classification code code designation of the fire performance of pipe component in terms of fire endurance and fire reaction properties

ISO 14692-1:2002

fire detection system system which provides continuous automatic monitoring to ISO 10418:2003


alert personnel to the presence of fire and to allow control actions to be initiated either manually or automatically

fire endurancefire resistance

ability to maintain functional performance in a fire ISO 14692-1:2002

fire endurance property ability of an element of the structure or component to continue to perform its function as a barrier or structural component during the course of a fire for a specified period of time

ISO 14692-2:2002

fire loop pneumatic control line containing temperature-sensing elements which, when activated, will initiate control actions in response to a hazardous situationNOTE Examples of temperature-sensing elements are: fusible plugs, synthetic tubing, etc.

ISO 10418:2003

fire reaction properties material-related properties concerned with time to ignition, surface flame-spread characteristics including smouldering and post-fire-exposure flaming, and rate of heat, smoke and toxic gas release

ISO 14692-2:2002

fired vessel vessel in which the temperature of a fluid is increased by the addition of heat supplied by a flame contained within a fire tube within the vessel

ISO 10418:2003

fire-reaction property material property which contributes to spread of fire, heat release and smoke/toxic emissions

ISO 14692-1:2002

first fill initial filling of liquid in equipment items, piping lines or tanksNOTE First fill typically takes place towards the end of site construction, prior to tow-out and prior to filling for normal operations.

ISO 19901-5:2003

first-end connection connection made at the initiation point of the flowline or umbilical installation process

ISO 13628-1:2005

fish-scaling tendency of one tensile armour wire edge to become detached from the underlying layer either because of deflection or because of incorrect twist deformation during armour winding

ISO 13628-2:2000

fit geometric relationship between partsNOTE This includes the tolerance criteria used during the design of a part and its mating part.

ISO 10423:2003

fit geometric relationship between partsNOTE This includes the tolerance criteria used during the design of a part and its mating parts, including seals.

ISO 10432:2004

fit-for-purpose meeting the intent of an International Standard although not meeting specific provisions of that International Standard in local areas, such that failure in these areas will not cause unacceptable risk to life-safety or the environment

ISO 19900:2002

fit-for-purposefitness-for-purpose

meeting the intent of an International Standard although not meeting specific provisions of that International Standard in local areas, such that failures in these areas will not cause unacceptable risk to life safety or the environment[ISO 19900:2002]

ISO 19901-7:2005

fitness-for-purpose suitability for use under the expected service conditions ISO 15156-2:2003fitterjointerpipe bonder

tradesman able to perform satisfactory and independent work in the installation and joining of composite pipes

ISO 14692-1:2002

fitting pressure-tight fluid-containing components with a geometry different from straight pipe.EXAMPLES Flanges, tees, elbows, reducers and fabricated branch.

ISO 14692-1:2002

fixed cost cost that does not vary as the level of activity varies ISO 15663-1:2000fixed offshore installation

all facilities located and installed on fixed offshore structures, which are provided to extract oil and gas hydrocarbons from subsea oil and gas reservoirs

ISO 15138:2000

fixed offshore structure structure permanently fixed to or located on the sea bed, including moored ships and hulls, which is held in position by

ISO 15138:2000


anchors or tensioned cables and is provided to (structurally) support topsides facilitiesNOTE Vessels and drilling rigs, etc. which are in transit or engaged in exploration and appraisal activities are specifically excluded from this definition.

fixed structure structure that is bottom founded and transfers all actions on it to the seabed

ISO 19900:2002

FKM fluoroelastomerFKM

type of O-ring elastomer material commonly used in mechanical seals

ISO 21049:2004

flame failure flame which is inadequate to instantaneously ignite combustible vapours entering the firing chamber of a fired vessel

ISO 10418:2003

flame retardant chemical that is used to reduce or eliminate the tendency of a resin to burn

ISO 14692-1:2002

flammable atmosphere mixture of flammable gas or vapour in air which will burn when ignited

ISO 13702:1999

flammable liquid liquid that has a closed-cup flash point below 37,8 °C (100 °F), as determined by recommended test procedures and apparatusNOTE Suitable test procedures are e.g. those set forth in NFPA 30.

ISO 13710:2004

flange protruding rim with holes to accept bolts and having a sealing mechanism used to join pressure-containing equipment, with dimensions specified in this International Standard

ISO 10423:2003

flange protruding rim, with holes to accept bolts and having a sealing mechanism, used to join pressure-containing equipment together by bolting to another flange

ISO 13533:2001

flange joint mechanical joint with face flanges for which the bolt circle and face dimensions conform to a recognized standard

ISO 14692-1:2002

flange-type coupling coupling having two flanges joined by bolts ISO 13625:2002flankside

surface of a thread that connects the crest with the root ISO 15463:2003

flash side side containing residue (“flash”) from stamping and with concave indentations

ISO 10416:2002

flash side side containing residue ("flash") from stamping; also, the side with concave indentations

ISO 13500:1998

flashing rapid change in fluid state from liquid to gasNOTE In a dynamic seal, this can occur when frictional energy is added to the fluid as it passes between the primaryseal faces, or when fluid pressure is reduced below the fluid's vapour pressure because of a pressure drop across the sealfaces.

ISO 21049:2004

flashing hydrocarbon liquid hydrocarbon with an absolute vapour pressure greater than 0,1 MPa (1 bar) (14,7 psi) at the pumping temperature, or a fluid that will readily boil at ambient conditions

ISO 21049:2004

flex joint laminated metal and elastomer assembly, having a central through-passage equal to or greater in diameter than the interfacing pipe or tubing bore, that is positioned in the riser string to reduce the local bending stresses

ISO 13628-7:2005

flexed condition of a bow spring when a force three times the specified minimum restoring force (± 5 %) has been applied to it

ISO 10427-1:2001

flexed condition of a bow-spring when a force three times the specified minimum restoring force (5 %) has been applied to it[ISO 10427-1:2001, 3.1]NOTE Specified minimum restoring force values are found in Table 1 of ISO 10427-1:2001.

ISO 10427-2:2004


flexibility factor ratio of the flexibility in bending of a component/fitting to that of the flexibility of a straight pipe of the same lamination, Young's modulus and thickness having a length corresponding to the developed length of the fitting

ISO 14692-1:2002

flexible element combination of components which move axially relative to the shaft/sleeve or seal chamber

ISO 21049:2004

flexible flowline flexible pipe, wholly or in part, resting on the seafloor or buried below the seafloor, and used in a static applicationNOTE The term flowline is used in this document as a generic term for flexible flowlines.

ISO 13628-10:2005

flexible graphite pure carbon graphite material used for static (secondary seal) gaskets in mechanical seal design, from cryogenic to hot service

ISO 21049:2004

flexible pipe assembly of a pipe body and end fittingsNOTE The pipe body comprises a composite of layered materials that form a pressure-containing conduit. The pipe structure allows large deflections without a significant increase in bending stresses. Normally, the pipe body is built up as a composite structure comprising metallic and elastomer layers. The term pipe is used in this document as a generic term for flexible pipe.

ISO 13628-10:2005

flexible pipe assembly of a pipe body and end fittingsNOTE The pipe body comprises a composite of layered materials that form a pressure-containing conduit. The pipe structure allows large deflections without a significant increase in bending stresses. Normally the pipe body is built up as a composite structure comprising metallic and polymer layers. The term “pipe” is used in this part of ISO 13628 as a generic term for flexible pipe.

ISO 13628-2:2000

flexible riser flexible pipe connecting a platform/buoy/ship to a flowline, seafloor installation or another platformNOTE The riser can be freely suspended (free catenary), restrained to some extent (buoys, chains), totally restrained or enclosed in a tube (I- or J-tube).

ISO 13628-10:2005

flexing length axial distance between the effective planes of flexure of a double-engagement coupling

ISO 10441:1999

flexing length axial distance between the effective flexing planes of a double-engagement coupling

ISO 14691:1999

floating bushing bushing that fits around the shaft or sleeve and has sufficient clearance around the outside diameter so it can move or “float” radially

ISO 21049:2004

floating loading and discharge hose

flexible pipe with integral buoyancy or clamped-on buoyancy modules so as to enable the buoyancy pipe to float on the water surface

ISO 13628-10:2005

floating shaft floating part, or assembly, of a double-engagement coupling that connects, and is flexibly supported from, the shaftmounted assemblies and through which the power is transmittedNOTE The floating shaft may include the spacer or may be only part of the spacer.

ISO 10441:1999

floating shaft floating part, or assembly, of a double-engagement coupling that connects and is flexibly supported from the shaft mounted assemblies and through which the power is transmittedNOTE The floating shaft may include the spacer or may be only part of the spacer.

ISO 14691:1999

floating structure structure where the full weight is supported by buoyancy ISO 19900:2002floating structure structure where the full weight is supported by buoyancy

[ISO 19900:2002]NOTE The full weight includes lightship weight, mooring system pre-tension, riser pre-tension, operating weight, etc.

ISO 19901-7:2005


floating vessel buoyant installation that is floating and positioned relative to the sea bottom by station-keeping systemsNOTE The following types of station-keeping systems are normally considered: catenary mooring systems and dynamic positioning systems based on thrusters. Combination of station-keeping systems can be considered.EXAMPLE Semi-submersible drilling vessels and drill ships.

ISO 13628-7:2005

float-out loading condition in which a major assembly is transferred from a dry construction site to become self-floating

ISO 19901-5:2003

flooded-mesh coupling continuously lubricated coupling in which the tooth meshes are completely submerged in oil during normal operation

ISO 10441:1999

flow capacity rate at which equipment, such as a shaker, can process drilling fluid and solidsNOTE It is a function of many variables, including shaker configuration, design and motion, drilling fluid rheology, solids loading, and blinding by near-size particles.

ISO 13501:2005

flow coefficientKv

volumetric flow rate, in cubic metres per hour, of water at a temperature between 5 °C (40 °F) and 40 °C (104 °F) passing through a valve and resulting in a pressure loss of 1 bar (14,7 psi)NOTE Kv relates to the flow coefficient Cv in US gallons per minute at 15,6 °C (60 °F) resulting in a 1 psi pressure drop as follows:Kv = Cv / 1,156

ISO 14313:1999

flow coefficient qv

volumetric flowrate of water at a temperature between 5 °C (40 °F) and 40 °C (104 °F) passing through a valve and resulting in a pressure loss of 100 kPa (14,7 psi)NOTE 1 It is expressed in cubic metres per hour.NOTE 2 qv relates to the flowrate coefficient Cv in US gallons per minute at 15,6 °C (60 °F) resulting in 1 psi pressure drop asfollows:qv = cv / 1,156NOTE 3 Adapted from ISO 14313:1999.

ISO 14723:2001

flow line piping or trough which directs drilling fluid from the rotary nipple to the surface drilling-fluid system

ISO 13501:2005

flow loops piping which connects the outlet(s) of the subsea tree to the subsea flowline connection and/or to other tree piping connections (crossover piping, etc.)

ISO 13628-4:1999

flow rate volume of liquid or slurry which moves through a pipe in one unit of timeNOTE It is expressed as cubic metres per minute, gallons per minute, barrels per minute, etc.

ISO 13501:2005

flow regime flow condition of a multi-phase process streamEXAMPLES Slug flow, mist flow or stratified flow.

ISO 13703:2000

flowline piping which directs the well stream from the wellhead to the first downstream process component

ISO 10418:2003

flowline production/injection line, service line or pipeline through which fluid flowsNOTE In this part of ISO 13628, the term is used to describe solutions or circumstances of general nature related to a flowline.

ISO 13628-1:2005

flowlineservice line

line from a platform or land facility to a subsea facility used for TFL servicingNOTE It may also be used for production or other testing of the well.

ISO 13628-3:2000

flowline any pipeline connecting to the subsea tree assembly ISO 13628-4:1999flowline piping that carries well fluid from wellhead to manifold or first

process vesselISO 13703:2000

flowline connector support frame

structural frame which receives and supports the flowline connector and transfers flowline loads back into the

ISO 13628-4:1999


wellhead or seabed anchored structureflowline connector system

equipment used to attach subsea pipelines and/or control umbilicals to a subsea treeNOTE The system may include means to guide the end of the pipeline or umbilical into place and may include remote connection or disconnection capability.

ISO 13628-4:1999

flowline segment any portion of a flowline that has an operating pressure different from another portion of the same flowline

ISO 10418:2003

flowline signatureservice line signature

particular set of pressure pulses (spikes) read or recorded at the surface that identifies a certain point in the service/flowline or well as tools are pumped past

ISO 13628-3:2000

flowrate volume of fluid pumped per time unit ISO 15136-1:2001flow-wetted component component that comes in direct contact with the dynamic

movement of well fluids in the flow streamcf. exposed component (see 3.11 in original document), internally wetted component (see 3.18 in original document)

ISO 14310:2001

flue gas gaseous product of combustion including excess air ISO 13705:2001fluid medium to be transported through the pipeline system ISO 13623:2000fluid gases, liquids and vapour in pure phases as well as mixtures

thereofISO 13628-7:2005

fluid gas, vapour, liquid or combinations thereof ISO 13703:2000fluid content all fluids flowing through a component, weight item or an

assemblyEXAMPLES Process gases, liquids, powders, etc.

ISO 19901-5:2003

fluid service category category concerning the application of a piping system, considering the combination of fluid properties, operating conditions and other factors which establish the basis for design of the piping system

ISO 15649:2001

fluorescent magnetic particle inspection

magnetic particle inspection process employing a finely-divided, fluorescent, ferromagnetic inspection medium that fluoresces when exposed to black light

ISO 15463:2003

flush plan configuration of pipe, instruments and controls designed to route the fluid concerned to the sealsNOTE Auxiliary piping plans vary with the application, seal type and arrangement.

ISO 21049:2004

flush, noun fluid which is introduced into the seal chamber on the process fluid side in close proximity to the seal faces and typically used for cooling and lubricating the seal faces

ISO 21049:2004

flux density strength of a magnetic fieldNOTE In the Gaussian system, flux density is expressed in gauss.

ISO 15463:2003

flux leakage magnetic field forced out into the air by a distortion of the field within the OCTG, caused by the presence of a discontinuity

ISO 15463:2003

fly ash powdered residue from the combustion of coal having pozzolanic propertiesNOTE See Clause 17 for further description.

ISO 10426-2:2003

flying lead unarmoured umbilical jumper with a termination plate at either end (incorporating connectors for the various lines) used to connect subsea facilities togetherNOTE 1 A flying lead is commonly used to connect e.g. a subsea control module on a subsea tree to a subsea umbilical distribution unit.NOTE 2 This type of umbilical jumper is lightweight and hence can be picked up from a deployment basket on the seabed and manoeuvred into position using a free-flying ROV.

ISO 13628-1:2005

foam phase system two-phase system, similar to an emulsion, in which the dispersed phase is air or gas

ISO 13501:2005

foam floating material bubbles floating on the surface of the drilling ISO 13501:2005


fluidNOTE The bubbles are usually air-cut drilling fluid but can be formation gasses.

forced-draught exchanger

exchanger designed with the tube bundles located on the discharge side of the fan

ISO 13706:2005

forced-draught heater heater for which combustion air is supplied by a fan or other mechanical means

ISO 13705:2001

forge, verb deform metal plastically into desired shapes with compressive forceNOTE Forging is usually a hot process. Use of dies is optional.

ISO 10423:2003

forge, verb hammerplastically deform metal, usually hot, into desired shapes by the use of compressive force, with or without dies

ISO 10424-1:2004

forge, verb plastically deform metal, usually hot, into desired shapes with compressive force, with open or closed dies

ISO 13533:2001

forging, noun shaped metal part formed by the forging method ISO 10423:2003forging, noun productshaped metal part formed by the forging method ISO 10424-1:2004forging, noun shaped metal part formed by the forging method ISO 13533:2001form essential shape of a product including all its component parts ISO 10423:2003form essential shape of a product including all its component parts ISO 10432:2004fouling allowance factor to allow for a layer of residue that increases pressure

dropNOTE 1 This residue is usually a build-up of coke or scale on the inner surface of a coil.NOTE 2 The fouling allowance is used in calculating the fouled pressure drop.

ISO 13705:2001

fouling resistance factor used to calculate the overall heat transfer coefficientNOTE The inside fouling resistance is used to calculate the maximum metal temperature for design. The external fouling resistance is used to compensate the loss of performance due to deposits on the external surface of the tubes or extended surface.

ISO 13705:2001

fractile p-fractile (or percentile) and the corresponding fractile value Xp is defined as F(Xp) = p, where F is the distribution function for Xp

ISO 13628-7:2005

fracture mechanics assessment

assessment and analysis where critical defect sizes under design loads are identified to determine the crack growth life, i.e. leak or fracture

ISO 13628-7:2005

frame assembly that provides the structural support and pressure containment of a plate-and-frame heat exchanger

ISO 15547-1:2005

free fluid coloured or colourless liquid which has separated from a cement slurry

ISO 10426-1:2005

free fluid coloured or colourless liquid which has separated from a cement slurry

ISO 10426-2:2003

free-end testing pressure-testing arrangement using pipe end closures of a type such that internal pressure produces axial, as well as hoop and radial, stresses in the component wallcf. axial load-free testing (2.2.110)

ISO 14692-1:2002

free-machining steel steel to which elements such as sulfur, selenium and lead have been added intentionally to improve machineability

ISO 15156-2:2003

freeze-thaw cycle test involving a cement sample that is alternately exposed to temperatures above and below the freezing point of water

ISO 10426-2:2003

frequency domain dynamic analysis method based on the assumption that any applied irregular process is a superposition of fundamental, regular processesNOTE Frequency domain analysis is usually associated with linear systems.

ISO 13628-7:2005

fuel efficiency total heat absorbed divided by the total input of heat derived from the combustion of fuel only (lower heating value basis)

ISO 13705:2001


NOTE This definition excludes sensible heat of the fuels and applies to the net amount of heat exported from the unit.

fugitive emission emission which is always present on a molecular scale from all potential leak sources in a plant under normal operating conditionsNOTE As a practical interpretation, a fugitive emission is one which cannot be detected by sight, hearing or touch but may be detected using bubble-test techniques or tests of a similar sensitivity.

ISO 15138:2000

full life cycle expected period of time in which the product is specified to function according to the supplier’s/manufacturer’s specifications

ISO 16070:2005

full life cycle expected period of time in which the product shall function according to manufacturer’s specifications

ISO 17078-1:2004

full-body inspection inspection coverage of the entire surface area of the OCTG within the limitations of the inspection equipment used

ISO 15463:2003

full-bore valve valve whose closure mechanism has the same bore dimension as the valve body

ISO 10423:2003

full-depth thread thread in which the thread root lies on the minor cone of an external thread or on the major cone of an internal thread

ISO 10424-1:2004

full-opening valve valve with an unobstructed opening capable of allowing a sphere or other internal device for the same nominal size as the valve to pass

ISO 14313:1999

full-opening valve valve with an unobstructed opening capable of allowing a sphere or other internal device for the same nominal size as the valve to pass[ISO 14313:1999]

ISO 14723:2001

full-penetration weld weld that extends throughout the complete wall section of the parts joined

ISO 13533:2001

full-penetration weld butt joint attained by double-welding or by other means which provides the same quality of deposited weld metal on the inside and outside surfaces to meet the requirements of the pressure design code

ISO 16812:2002

function operation of a product during service ISO 10423:2003function operation of a product during service ISO 10432:2004function ability of the piping system to perform its primary purpose, i.e.

to deliver a minimum quantity of fluid above a minimum pressure

ISO 14692-1:2002

functional components components included within an umbilical which are required to fulfil the operational service needsEXAMPLES Hoses, tubes, electric/optical fibre cables.

ISO 13628-5:2002

functional load load caused by the physical existence of the riser system and by the operation and handling of the system, excluding pressure loads

ISO 13628-7:2005

functional requirement minimum criterion which shall be satisfied in order to meet a stated objective or objectivesNOTE Functional requirements are performance oriented and are applicable to a wide range of development concepts.

ISO 13628-8:2002

functional requirements minimum criteria which must be satisfied to meet the stated health, safety and environmental objectives

ISO 13702:1999

functional requirements minimum criteria which should be satisfied to meet the stated health, safety and environmental objectivesNOTE See 5.4.2 for further information.

ISO 17776:2000

functional specification document that specifies the totality of needs expressed by features, characteristics, process conditions, boundaries and exclusions defining the performance of a product or service including quality assurance requirements

ISO 13628-5:2002


functional specification document that describes the features, characteristics, process conditions, boundaries and exclusions defining the performance and use requirements of the product, process or service

ISO 13879:1999

functional specification document that describes the features, characteristics, process conditions, boundaries and exclusions defining the performance and use requirements of the product, process or service

ISO 13880:1999

functional test test performed to confirm proper operation of equipment ISO 10432:2004functionality capability of a side-pocket mandrel to conform to defined

properties, characteristics and limitsISO 17078-1:2004

furnace test test in a compartment furnace where the time-temperature curve to be followed is to a defined standard

ISO 14692-1:2002

furring build-up or bristling of dry magnetic particles at the ends of a longitudinally-magnetized length of OCTG, i.e. at its poles

ISO 15463:2003

future weight weight of a component or an assembly to be installed after the start of productionNOTE Start of production is also known as “first oil”.

ISO 19901-5:2003

gain sensitivity adjustment produced by an amplifier or circuit ISO 15463:2003galling cold welding of contacting material surfaces followed by

tearing of the materials during further sliding/rotationNOTE Galling results from the sliding of metallic surfaces that are under high bearing forces. Galling can generally be attributed to insufficient lubrication between the surfaces. The purpose of the lubrication medium is to minimize the metal-to-metal contact and allow efficient sliding of the surfaces. Other ways to prevent galling are to reduce the bearing forces or reduce the sliding distance.

ISO 13628-7:2005

galling cold welding of contacting material surfaces followed by tearing of the metal during further sliding/rotationNOTE 1 Galling results from the sliding of metallic surfaces that are under high bearing forces. Galling can generally be attributed to insufficient lubrication between the mating surfaces. The purpose of the lubricating medium is to minimize metal-to-metal contact and allow efficient sliding of the surfaces. Other ways to prevent galling are to reduce the bearing forces or reduce the sliding distance.NOTE 2 There are several degrees of galling used for repair and reporting purposes as defined in 3.1.5.1 to 3.1.5.3.

ISO 13679:2002

galling localized damage to material surfaces resulting from contact conditionsNOTE Galling can be caused by cold welding of contacting material surfaces followed by tearing of the weld during further sliding or rotation.

ISO 21329:2004

galvanic anode electrode that provides current for cathodic protection by means of galvanic action

ISO 15589-1:2003

galvanically-induced hydrogen stress-crackingGHSC

cracking that results due to the presence of hydrogen in a metal, induced in the cathode of a galvanic couple, and tensile stress (residual and/or applied)

ISO 15156-3:2003

gamma-ray high-energy, short wavelength, electromagnetic radiation emitted by a nucleus, which is penetrating and is best attenuated by dense material like lead or tungstenNOTE The energy of gamma-rays is usually between 0,010 MeV and 10 MeV.

ISO 15463:2003

gas blowby discharge of gas from a process component through a liquid outlet

ISO 10418:2003

gas detection system system which monitors spaces on an offshore installation for the presence and concentration of flammable gases and

ISO 10418:2003


initiates alarm and control actions at predetermined concentrations

gas load force resulting from differential gas pressure acting on the piston differential area

ISO 13631:2002

gas metal arc-weld: Longitudinal seam weld produced in whole or in part by the continuous gas metal arc-welding process defined in 3.2.1.2 (b).

ISO 3183-1:1996

gas metal arc-welded pipe:

Pipe having one longitudinal or helical seam produced by thecontinuous gas metal arc-welding process defined in 3.2.1.2 (b).

ISO 3183-1:1996

gas passage undercut clearance between the flow-control device and the pocket of the side-pocket mandrel through which injected media flow

ISO 17078-1:2004

gas seal module arrangement of piping, filters and instrumentation used to control and monitor the pressure or flow of seal, buffer, or separation gas to the equipment shaft-end seals

ISO 10438-1:2003

gas service service conditions with a gas content, i.e. gas applications or live crude containing gas

ISO 13628-10:2005

gasket deformable material (or combination of materials) intended to be clamped between flanges to prevent leakage of fluid

ISO 13628-7:2005

gasket-retaining load that portion of the clamping load required to offset the separating force the gasket exerts on the hubs when pressurized

ISO 13533:2001

gasket-seating load that portion of the clamping load required to seat the gasket and bring the hub faces into contact

ISO 13533:2001

gas-tight capable of holding gas without leaking under the specified pressure for the specified length of time

ISO 10424-1:2004

gate valve valve assembly with a gate operating within the body, 90° to the conduit, to effect a closure

ISO 10423:2003

gauge and test port connection

hole drilled and tapped into wellhead and christmas tree equipment through which internal pressure may be measured or through which pressure may be applied to test the sealing mechanisms

ISO 10423:2003

gauge board bracket or plate used to support and display gauges, switches, and other instrumentsNOTE A gauge board is open and not enclosed.

ISO 10437:2003

gauge board un-enclosed bracket or plate used to support and display gauges, switches and other instruments

ISO 10438-1:2003

gauge board unenclosed bracket or plate used to support and display gauges, switches and other instruments

ISO 13707:2000

gauge OD maximum specified product OD ISO 14310:2001gauge point plane perpendicular to the thread axis in API rotary shouldered

connectionsNOTE The gauge point is located 15,9 mm (0.625 in) from the shoulder of the product pin.

ISO 10424-1:2004

Gauss level magnetic field level of a component measured with a “Hall effect” probe with no interference from adjacent magnetic parts or structures

ISO 13691:2001

gauss meter electronic magnetometer used to measure flux density ISO 15463:2003gear coupling type of mechanical contact coupling designed to transmit

torque and accommodate misalignment and axial displacement by relative rocking and sliding motion between mating internal and external profiled gears

ISO 10441:1999

gear coupling coupling designed to transmit torque and accommodate angular misalignment, parallel offset and axial displacement by relative rocking and sliding motion between mating profiled gears

ISO 14691:1999


gear rated power maximum power specified by the purchaser on the data sheet and stamped on the nameplatecf. 5.2.1.

ISO 13691:2001

gear selection factorKSL

factor applied to the calculated contact stress number and the calculated bending stress number, depending on the characteristics of the driver and the driven equipment, to account for potential overload, shock load and/orcontinuous oscillatory torque characteristics

ISO 13691:2001

gel coat quick-setting resin applied to the surface of a mould and gelled before lay-upNOTE The gel coat becomes an integral part of the finished laminate, and is usually used to provide specific service characteristics (see liner, 2.2.69).

ISO 14692-1:2002

general purpose application that is usually spared or is in non-critical service ISO 10438-1:2003general-purpose turbines

horizontal or vertical turbines used to drive equipment that is usually spared, is relatively small in size (power), or is in non-critical serviceNOTE General-purpose steam turbines are intended for applications where the inlet gauge pressure does not exceed 4 800 kPa (48 bar) (700 psi) and the inlet temperature does not exceed 400 °C (750 °F), and where the speed does not exceed 6 000 r/min.

ISO 10437:2003

gimbal device that interfaces with the spider and the riser joint and enables the riser to rotate about the horizontal axis, thereby reducing the bending moments, which can otherwise occur due to vessel roll/pitch motions

ISO 13628-7:2005

girth weld circumferential butt weld in pipe ISO 13847:2000gland plate end plate which connects the stationary assembly of a

mechanical seal to the seal chamber or containment seal chamber

ISO 21049:2004

glass transition temperature

Tgtemperature at which amorphous polymer undergoes a marked change in properties on passing from the rubbery to glassy stateNOTE This observed change in properties is associated with the virtual cessation of local molecular motion in the polymer. Below their glass-transition temperature, amorphous polymers have many of the properties associated with ordinary inorganic glasses, whilst above this temperature the polymers possess rubbery characteristics.

ISO 14692-1:2002

glass-fibre-reinforced epoxyGRE

epoxy resin-based composite that is reinforced with glass fibre ISO 14692-1:2002

glass-fibre-reinforced plasticGRPfibreglass

compositereinforced plasticreinforced thermosetting resin plasticRTR plasticpolymeric resin-based composite that is reinforced with glass fibreNOTE 1 The predominant glass fibre is E-glass (2.2.23).NOTE 2 ISO 14692 (all parts) is restricted to the use of thermosetting (2.2.120) resins.

ISO 14692-1:2002

global analysis analysis of the complete riser string from the sea floor (wellhead) to top drive including tensioner joint, utilizing beam elementNOTE Bending moments and effective tension distributions along the riser string due to functional loads, vessel motions and environmental loads are determined by global analysis.

ISO 13628-7:2005

global buckling elastic Euler buckling ISO 13628-7:2005governor-controlled device that controls the flow of steam into or out of the turbine ISO 10437:2003


valve in response to the speed governorgrade category or rank given to different requirements for quality or

design validationISO 14310:2001

grade of release <area classification> measure of the likely frequency and duration of a releaseNOTE It is independent of the rate of release, the quantity of material released, the degree of ventilation and the characteristics of the fluid.

ISO 13702:1999

grey cast iron cast iron that displays a grey fracture surface due to the presence of flake graphite

ISO 15156-2:2003

grillage temporary structural foundation assemblies for modules or sections during transportation

ISO 19901-5:2003

grind, verb remove material from a surface by abrading, e.g. with a grinding wheel or file

ISO 15463:2003

grip length combined thickness of all the elements clamped together by the bolts and nuts, including washers, gaskets and joint members

ISO 13628-7:2005

gross reported weight sum of the net weight and weight allowance ISO 19901-5:2003gross structural discontinuity

structural or material discontinuity which affects the stress or strain distribution across the entire wall thickness over a region of significant areaEXAMPLE End-to-pipe junction, connector-to-pipe junction, the junction of two pipes of different diameters, thickness or material, or a stiffener-to-pipe junction.

ISO 13628-7:2005

gross weight/WTO contingency

difference between the gross reported weight and the gross WTO at any time during the project execution

ISO 19901-5:2003

gross WTOgross weight take-off

sum of the net WTO and weight allowance ISO 19901-5:2003

ground motions accelerations, velocities or displacements of the ground produced by seismic waves radiating away from earthquake sourcesNOTE A fixed offshore structure is founded in or on the seabed and consequently only seabed motions are of significance. The term ground motions is used rather than seabed motions for consistency of terminology with seismic design for onshore structures.

ISO 19901-2:2004

groundbed system of buried or immersed galvanic or impressed-current anodes

ISO 15589-1:2003

grounding clamp metal fitting attached to the pipe component to provide an electrical connection to earth

ISO 14692-1:2002

guide funnel tapered enlargement at the end of a guidance member to provide primary guidance over another guidance member

ISO 13628-4:1999

guide lineless systems systems which do not depend on the establishment of guide lines from the seafloor to the surface vessel for guidance and alignment of subsea equipment during installation, operation, intervention, or retrieval

ISO 13628-4:1999

guide lines taut lines from the seafloor to the surface for the purpose of guiding equipment to the seafloor structure

ISO 13628-4:1999

guide track and dollies equipment used to hold the travelling equipment in correct position relative to the derrick during various operationsNOTE A retractable dolly is used move the travelling equipment horizontally between the drilling position and the retracted position.

ISO 13626:2003

guideline recommendation of recognized practice to be considered in conjunction with applicable statutory requirements, industry standards, standard practices and philosophies

ISO 13628-8:2002

gumbo cuttings that agglomerate and form a sticky mass as they are circulated up the wellbore

ISO 13501:2005

gust brief rise and fall in wind speed lasting less than 1 minNOTE In some countries, gusts are reported in meteorological

ISO 19901-1:2005


observations if the maximum wind speed exceeds approximately 8 m/s.

gust wind speed maximum value of the wind speed of a gust averaged over a short (3 s to 60 s) specified duration within a longer (1 min to 1 h) specified durationNOTE 1 For design purposes, the specified duration depends on the dimensions and natural period of the (part of the) structure being designed such that the structure is designed for the most onerous conditions; thus, a small part of a structure is designed for a shorter gust wind speed duration (and hence a higher gust wind speed) than a larger (part of a) structure.NOTE 2 In practice, for design purposes, the gust wind speeds for different durations (e.g. 3 s, 5 s, 15 s, 60 s) are derived from the wind spectrum.

ISO 19901-1:2005

guy line wire rope with one end attached to the mast assembly and the other end attached to a suitable anchor to provide structural and/or lateral support for a mast under design loading conditions

ISO 13626:2003

guying pattern plan view showing the manufacturer's recommended locations for guy lines and their distance out to the anchors with respect to the centreline of the well

ISO 13626:2003

H2S trim all components, except external valve body, meeting the H2S service requirements of ISO 15156-2 and ISO 15156-3NOTE For the purposes of this provision, NACE MR0175 is equivalent to ISO 15156–2 and ISO 15156–3.

ISO 10424-1:2004

half-coupling composite of all the components of the coupling attached to and supported from one shaft, including an appropriate portion of the spacer assembly in the case of a double-engagement coupling or of the flexing elements of a singleengagement coupling

ISO 10441:1999

hand lay-up process for fabricating a composite structure in which discontinuous reinforcements, e.g. woven mats, chopped strand mats, are impregnated with a matrix material and are manually applied on a mandrel

ISO 14692-1:2002

handling damage damage to the OCTG body, coupling or threads that occurred during loading, unloading, movements in transit, etc.EXAMPLES cuts, gouges, dents, flattened (mashed) thread crests or similar.

ISO 15463:2003

handling tight sufficiently tight that the coupling cannot be removed except by the use of a wrench

ISO 11960:2004

handwheel wheel consisting of a rim connected to a hub, for example by spokes, and used to operate manually a valve requiring multiple turns

ISO 14313:1999

handwheel wheel consisting of a rim connected to a hub, for example by spokes, and used to operate manually a valverequiring multiple turns[ISO 14313:1999]

ISO 14723:2001

hanger mandrel portion of a casing or tubing hanger which is attached by a threaded connection to the tubular string and forms the upper end of that tubular string

ISO 10423:2003

hang-off riser when disconnected from seabedNOTE Hang-off is usually differentiated from disconnected. Disconnected is normally the condition directly after disconnecting the riser. Hang-off is normally associated with the riser suspended from the rotary table.

ISO 13628-7:2005

hardener substance or mixture added to a plastic composition to promote or control the curing action by taking part in it

ISO 14692-1:2002

hardness resistance of metal to plastic deformation, usually measured ISO 15156-1:2001


by indentationhardness resistance of a material to indentation, measured by pressing

a hardmetal ball or diamond indenter into a smooth surface under standard conditions

ISO 15463:2003

hardness value average of the valid readings taken in the test area for hardness

ISO 15463:2003

hazard potential for human injury, damage to the environment, damage to property, or a combination of these

ISO 13702:1999

hazard potential for human injury, damage to the environment, damage to property or a combination of these

ISO 15544:2000

hazard potential source of harmNOTE In the context of this International Standard, the potential harm may relate to human injury, damage to the environment, damage to property, or a combination of these.

ISO 17776:2000

hazard assessment process whereby the results of an analysis of a hazard or hazardous event are considered against either judgement, standards or criteria which have been developed as a basis for decision-making

ISO 13702:1999

hazard assessment process whereby the results of an analysis of a hazard or hazardous event are considered against either judgement, standards, or criteria which have been developed as a basis for decision-making

ISO 15544:2000

hazardous area three-dimensional space in which a flammable atmosphere may be expected to be present frequently enough to require special precaution for the control of potential ignition sources

ISO 10418:2003

hazardous area three-dimensional space in which a flammable atmosphere may be expected to be present at such frequencies as to require special precautions for the control of potential ignition sources

ISO 13702:1999

hazardous area three-dimensional space in which a flammable atmosphere may be expected to be present frequently enough to require special precautions for the control of potential ignition sources

ISO 14692-1:2002

hazardous event incident which occurs when a hazard is realisedEXAMPLES Release of gas, fire, gas blowby.

ISO 10418:2003

hazardous event incident which occurs when a hazard is realizedEXAMPLES Release of gas, fire, loss of buoyancy.

ISO 13702:1999


ISO 15544:2000


ISO 17776:2000

hazards register document providing a brief, but complete, overview of the identified hazards and the measures necessary to manage themNOTE The hazards register also provides references to more detailed information relevant to a particular hazard.

ISO 17776:2000

head specific compression work ISO 10439:2002head height that a fluid column would reach in an open-ended pipe

if the pipe were attached to the point of interestNOTE The head at the bottom of a 300 m (1 000 ft) well is 300 m (1 000 ft), but the pressure at that point depends upon the density of the drilling fluid in the well.

ISO 13501:2005

head rating maximum allowable differential pressure of the PCP ISO 15136-1:2001header part of a manifold that directs fluid to a specific process

systemSee Figures 5 and 6 in original document

ISO 13703:2000

headerreturn bend

cast or wrought fitting shaped in a 180° bend and used to connect two or more tubes

ISO 13705:2001


header box internally insulated structural compartment, separated from the flue-gas stream, which is used to enclose a number of headers or manifoldsNOTE Access is afforded by means of hinged doors or removable panels.

ISO 13705:2001

heatcast lot

material originating from a final meltNOTE For remelted alloys, a heat is the raw material originating from a single remelted ingot.

ISO 10423:2003

heat metal produced by a single cycle of a batch melting process ISO 11960:2004heatcast lot

material originating from a final meltNOTE For remelted alloys, a heat is defined as the raw material originating from a single remelted ingot.

ISO 13533:2001

heat metal produced by a single cycle of a batch melting process ISO 15546:2002heat batch of steel prepared in one steel-making operation ISO 15590-1:2001heat batch of steel prepared in one steel-making operation

[ISO 15590-1:2001]ISO 15590-3:2004

heat material originating from a final melt or cast lotNOTE For re-melted alloys, the heat is the raw material originating from a single re-melted ingot.

ISO 17078-1:2004

heat absorption total heat absorbed by the coils, excluding any combustion-air preheat

ISO 13705:2001

heat analysis chemical analysis representative of a heat as reported by the metal producer

ISO 11960:2004

heat exchanger unit one or more heat exchangers for a specified service that may include alternative operating conditions

ISO 16812:2002

heat fluxdensity of heat flow rate

quantity of heat divided by area and time ISO 14692-1:2002

heat traceable traceable back to a unique heat treatment (heat) of material ISO 14310:2001heat transfer area sum of the surface areas of one side of all plates in contact

with both heat-transfer fluidsNOTE Areas of end plates are not included.

ISO 15547-1:2005

heat transfer area sum of the primary and secondary heat transfer surface areas of all heat-transfer passages in contact with a streamSee Figure 1.NOTE 1 The primary heat transfer surface within the plate-fin heat exchanger consists of the bare parting sheet and the fin base directly brazed to the parting sheet.NOTE 2 The secondary heat transfer surface is provided by the fins. This area includes both sides of the fins where they are in contact with the fluid.

ISO 15547-2:2005

heat treat lot batch furnacesmaterial placed on loading or carry devices and moved as a batch through one heat treat cycle

ISO 10423:2003

heat treat lot continuous furnacesgroup of pieces of material with the same nominal size that is moved sequentially through the heat treatment process using the same process parameters

ISO 10423:2003

heat treatmentheat treating

alternating steps of controlled heating and cooling of materials for the purpose of changing physical or mechanical properties

ISO 10423:2003


alternate steps of controlled heating and cooling of materials for the purpose of changing mechanical properties International Standard

ISO 10432:2004


alternate steps of controlled heating and cooling of materials for the purpose of changing physical or mechanical properties

ISO 13533:2001

heat treatment heating and cooling a solid metal or alloy in such a way as to obtain desired propertiesNOTE Heating for the sole purpose of hot working is not considered heat treatment.

ISO 15156-1:2001

heat treatment load that material moved as a batch through one heat treatment ISO 13533:2001


cycleheat, noun metal produced by a single cycle of a batch melting process ISO 10424-1:2004heat, noun batch of steel prepared in one steel-making process


heat, noun batch of steel prepared in one steel-making operation[ISO 15590-1:2001]

ISO 21329:2004

heat-affected zoneHAZ

portion of the base metal which has not been melted, but whose mechanical properties or microstructure has been altered by the heat of welding or cutting

ISO 10423:2003

heat-affected zoneHAZ

that portion of the base metal which has not been melted, but whose mechanical properties or microstructure has been altered by the heat of welding or cutting

ISO 13533:2001

heat-affected zone region around a weld that has been affected by welding ISO 13628-7:2005heat-affected zoneHAZ

that portion of the base metal that is not melted during brazing, cutting or welding, but whose microstructure andproperties are altered by the heat of these processes

ISO 15156-1:2001

heat-distortion temperature

temperature at which a standard test bar deflects a specified amount under a stated load

ISO 14692-1:2002

heat-sensitive lock-open device

device installed on a surface safety valve (SSV) actuator to maintain the SSV valve in a full open position until exposed to sufficient heat to cause the device to release and allow the SSV valve to close

ISO 10423:2003

heat-up rateRh

rate of slurry temperature change on going from the surface temperature, TSS, to the predicted bottom-hole circulating temperature, TPBHC

ISO 10426-2:2003

heave floating vessel motion in the vertical direction ISO 13628-7:2005heave-compensated system

system that limits the effect of vertical vessel motion on the deployed ROT system

ISO 13628-9:2000

height of derrick and mast without guy lines

minimum vertical distance from the top of the working floor to the bottom of the crown block support beams

ISO 13626:2003

height of mast with guy line

minimum vertical distance from the ground to the bottom of the crown block support beams

ISO 13626:2003

helical seam submerged arc-welded pipe:

Pipe having one helical seam produced by the automatic submerged arc-welding process defined in 3.2.1.2 (a). (This type of pipe is also known as spiral weld pipe.)

ISO 3183-1:1996

helix continuous spiral with a constant pitch ISO 15136-1:2001hesitation-pumping squeeze-cementing operation

squeeze-cementing operation that incorporates discontinuous pumping of the cement slurryNOTE The slurry is placed into the well, the pumps are stopped for some period of time, then a volume of slurry is again pumped. The process is repeated until a predetermined pressure is reached or the volume of cement slurry has been completely pumped.

ISO 10426-2:2003

High frequency welded (HFW) pipe

Tubular product manufactured by forming from strip and welding the abutting edges without addition of filler metal. The longitudinal seam is generated by high frequency current applied by induction or conduction.NOTE 2 High frequency implies in this part of I%0 3183 a frequency of at least 100 kHz.

ISO 3183-2:1996

high liquid level in a process component, liquid level above the normal operating level but less than the maximum allowableworking level

ISO 10418:2003

high pressure in a process component, pressure in excess of the normal operating pressure but less than the maximumallowable working pressureNOTE For pipelines, the maximum allowable working pressure is the maximum allowable operating pressure.

ISO 10418:2003

high pressure riser tubular member which extends the wellbore from the mudline ISO 13628-4:1999


wellhead or tubing spool to a surface BOPhigh specific gravity solids

solids added to a drilling fluid specifically to increase drilling-fluid densityNOTE Barite (specific gravity 4,2) and haematite (specific gravity 5,05) are the most common.

ISO 13501:2005

high temperature in a process component, temperature in excess of the normal operating temperature but less than the maximum allowable working temperature

ISO 10418:2003

higher heating valuehH

gross heating value

total heat obtained from the combustion of a specified fuel at 15 °C (60 °F)

ISO 13705:2001

highest astronomical tideHAT

level of high tide when all harmonic components causing the tides are in phaseNOTE The harmonic components are in phase approximately once every 19 years, but these conditions are approached several times each year.

ISO 19901-1:2005

high-frequency welded pipeHFW pipe

tubular product, manufactured by forming from strip and welding the abutting edges without addition of filler metal, in which the longitudinal seam is generated by high-frequency (at least 100 kHz) current applied by induction or conduction

ISO 3183-3:1999

hindcasting method of simulating historical (metocean) data for a region through numerical modelling

ISO 19901-1:2005

H-member nipple assembly that provides fluid communication and circulation between strings of tubing in the wellbore

ISO 13628-3:2000

hold period period of time that the product is subjected to pressure and isolated from the pressure source

ISO 10423:2003

hold point point, defined in an appropriate document, beyond which an activity should not proceed without the approval of a designated organization or authorityNOTE The approval to proceed beyond a hold point is usually given in written form, but it may be given by any other agreed system of authorization.

ISO/TR 13881:2000

hold-down boltmounting bolt

bolt that holds the equipment to the mounting plate ISO 13710:2004

hold-down bolts mounting bolts bolts that hold the equipment to the mounting plate or plates

ISO 10437:2003

holding device device employed to fix the stop collar or centralizer to the casingEXAMPLES Set screws, nails, mechanical dogs and epoxy resins.

ISO 10427-1:2001

holding device device employed to fix the stop collar or centralizer to the casingEXAMPLE Set screws, nails, mechanical dogs and epoxy resins.[ISO 10427-1:2001, 3.2]

ISO 10427-2:2004

holding force maximum force required to initiate slippage of a stop collar on the casing

ISO 10427-1:2001

holding force maximum force required to initiate slippage of a stop collar on the casing[ISO 10427-1:2001, 3.3]

ISO 10427-2:2004

hole size diameter of the wellbore ISO 10427-1:2001hole size diameter of the wellbore

[ISO 10427-1:2001]ISO 10427-2:2004

hook sleeve sleeve, with a step or hook at the product end, placed over the shaft to protect it from wear and corrosionNOTE The step is usually abutted against the impeller to hold it in place with a gasket between the shaft and the step (hook).

ISO 21049:2004

hook strip hooks on the edge of a screen section of a shale shaker which ISO 13501:2005


accept the tension member for screen mountinghook weight sum of lift weight and lifting gear weight ISO 19901-5:2003hook-up installation and commissioning of components or assemblies

after the modules have been installed in their final positionISO 19901-5:2003

hoppermud hopper

large funnel- or coned-shaped device into which dry components are poured to uniformly mix the components with liquids or slurries that are flowing through the lower part of the cone

ISO 13501:2005

horizontal tree subsea tree with production and annulus bore valves located external to the tree, where the tubing hanger or dummy tubing hanger is installed after the tree

ISO 13628-7:2005

host facility fixed or floating facility to which the umbilical is mechanically and functionally connected and which provides the functions and services to be transmitted through the umbilicalEXAMPLES Platform, buoy, floating production system.

ISO 13628-5:2002

hot face layer refractory layer exposed to the highest temperatures in a multilayer or multicomponent lining

ISO 13705:2001

hot face temperature temperature of the refractory surface in contact with the flue gas or heated combustion airNOTE The hot face temperature is used to determine refractory or insulation thickness and heat transmitted.

ISO 13705:2001

hot finishing deforming metal plastically at such a temperature and strain rate that recrystallization takes place simultaneously with the deformation, thus preventing permanent strain hardening

ISO 13680:2000

hot isostatic pressingHIP

special forming process used to compact and metallurgically bond metal powderNOTE This process takes place within a flexible, metal container whose contents are formed into the desired shape by subjecting the container to high temperature and pressure in an autoclave. It produces a fully wrought structure.

ISO 10423:2003

hot tapping tapping, by mechanical cutting, of a pipeline in service ISO 13623:2000hot-work deform metal plastically at a temperature above the

recrystallization temperatureISO 10423:2003

hot-work, verb deform metal plastically at a temperature above the recrystallization temperature

ISO 13533:2001

HP/LP interface point in a process plant where operating pressure changes from high pressure to low pressureNOTE A change in system design pressure or piping class is often associated with the HP/LP interface.

ISO 10418:2003

hub protruding rim with an external angled shoulder and a sealing mechanism used to join pressure-containing equipment

ISO 10423:2003

hub part of a coupling mounted directly onto the shaft of the driving or driven machine

ISO 10441:1999

hub protruding rim with an external angled shoulder and a sealing mechanism used to join pressure-containing equipment

ISO 13533:2001

hub part of a coupling mounted directly onto the shaft of the driving or driven machine

ISO 14691:1999

hunting tooth combination

<mating gears> combination existing when a tooth on the pinion does not repeat contact with a tooth on the gear until it has contacted all the other gear teeth

ISO 13691:2001

hydration shrinkage difference in the volume between the hydration products and the volume of the dry cement, additives and water

ISO 10426-5:2004

hydraulic connector hydraulically actuated drill-through equipment that locks and seals on end connections

ISO 13533:2001

hydraulic connector mechanical connector that is activated hydraulically ISO 13628-7:2005


hydraulic power recovery turbine

turbomachine designed to recover power from a fluid stream ISO 13709:2003

hydrocarbon pool fire fire caused by ignition of a pool of hydrocarbon liquid ISO 14692-1:2002hydrocarbon wettability ability of the process stream to form a protective hydrocarbon

film on metal surfacesISO 13703:2000

hydrocycloneconecyclone

liquid-solids separation device utilizing centrifugal force for settlingNOTE Fluid enters tangentially and spins inside the hydrocyclone The heavier solids settle to the walls of the hydrocyclone and move downward until they are discharged at the hydrocyclone apex. The spinning fluid travels partway down the hydrocyclone and back up to exit out the top of the hydrocyclone through a vortex finder.

ISO 13501:2005

hydrodynamic bearing bearing that uses the principles of hydrodynamic lubrication ISO 13709:2003hydrodynamic bearings bearings that use the principles of hydrodynamic lubrication

NOTE The bearing surfaces are oriented so that relative motion forms an oil wedge, or wedges, to support the load without shaft-to-bearing contact.

ISO 10437:2003

hydrodynamic loads flow-induced loads caused by the relative motion between the riser and the surrounding water

ISO 13628-7:2005

hydrogen getter medium, within an optical fibre system, that chemically neutralizes hydrogen

ISO 13628-5:2002

hydrogen stress crackingHSC

cracking that results from the presence of hydrogen in a metal and tensile stress (residual and/or applied)NOTE HSC describes cracking in metals that are not sensitive to SSC but which may be embrittled by hydrogen when galvanically coupled, as the cathode, to another metal that is corroding actively as an anode. The term galvanically induced HSC has been used for this mechanism of cracking.

ISO 15156-1:2001

hydrogen-induced crackingHIC

planar cracking that occurs in carbon and low alloy steels when atomic hydrogen diffuses into the steel and then combines to form molecular hydrogen at trap sitesNOTE Cracking results from the pressurization of trap sites by hydrogen. No externally applied stress is needed for the formation of hydrogen-induced cracks. Trap sites capable of causing HIC are commonly found in steels with high impurity levels that have a high density of planar inclusions and/or regions of anomalous microstructure (e.g. banding) produced by segregation of impurity and alloying elements in the steel. This form of hydrogen-induced cracking is not related to welding.

ISO 15156-1:2001

hydrostatic test test performed by filling a length of OCTG with water and pressurizing it in order to verify its ability to withstand a specified pressure without leaking or rupturingNOTE A hydrostatic test is generally considered a method to verify the structural integrity of the pipe but not the threaded connection.

ISO 15463:2003

hydrostatic test pressureproof pressure

maximum test pressure at a level greater than the design pressure (rated working pressure)

ISO 13628-6:2000

hydrotest pressure test to verify the pressure-retention integrity of a piping system after installationcf. mill hydrostatic test (2.2.78)NOTE Also used as a leak test.

ISO 14692-1:2002

identical design concept

property of a family of units whereby all units of the family have similar geometry in the primary load-carrying areas

ISO 14693:2003

idling adaptersolo plate

device designed to rigidly hold in alignment the floating parts at the drive end of certain types of coupling, to allow uncoupled operation of the driving machine without dismounting the coupling hub

ISO 10441:1999


ignition sources any source with sufficient energy to initiate combustion ISO 13702:1999impact loading loading resulting from near-instantaneous changes of forces ISO 13626:2003impeller spinning disc in a centrifugal pump with protruding vanes used

to accelerate the fluid in the pump casingISO 13501:2005

imperfection discontinuity in the product wall or on the product surface that can be detected by a NDE method included in Table C.62 or Table E.62 of this International Standard

ISO 11960:2004

imperfection Discontinuity or irregularity in the product detected by methods outlined in this International Standard.

ISO 11961:1996

imperfection discontinuity or irregularity in the product detected by methods outlined in this International Standard

ISO 13680:2000

imperfectionflaw

discontinuity or irregularity in the productNOTE For more detailed definitions and illustrations of specific imperfections, see API Std 5T1.

ISO 15463:2003

imperfection discontinuity or irregularity in the productNOTE Imperfections are detected by methods outlined in this International Standard.

ISO 15546:2002

imperfection irregularity in the wall or on the surface detectable by methods described in this part of ISO 15590

ISO 15590-3:2004

imperfection irregularity in the wall or on the pipe surface detectable by methods described in this part of ISO 3183NOTE Imperfections with a size and/or population density that are within the acceptance criteria defined in this part of ISO 3183 are considered to have no practical implication on the intended use of the product.

ISO 3183-3:1999

Imperfections An “imperfection” is a discontinuity or irregularity in the product detected by methods outlined in this part of IS0 3183.

ISO 3183-1:1996

Imperfections Imperfections are irregularities in the wall or on the pipe surfaces detectable by methods described in this part of IS0 3183. Imperfections with a size and/or population density that are within the acceptance criteria defined in this part of IS0 3183 are considered to have no practical implication on theintended use of the product.

ISO 3183-2:1996

impregnate saturate the reinforcement with a resin ISO 14692-1:2002impressed-current anode

electrode that provides current for cathodic protection by means of impressed current

ISO 15589-1:2003

impressed-current station

station containing the equipment which provides cathodic protection by means of impressed current

ISO 15589-1:2003

impressed-current system

system which provides cathodic protection by means of impressed current

ISO 15589-1:2003

inboard tree piping subsea tree piping which is upstream of the first tree wing valve

ISO 13628-4:1999

incendive discharge electrostatic spark discharge of sufficient energy to ignite a flammable atmosphere

ISO 14692-1:2002

incidentaccident

event or chain of events which cause, or could have caused, injury, illness and/or damage (loss) to assets, the environment or third parties

ISO 17776:2000

independent verification agent

independent party or group, selected by the manufacturer, that can verify the indicated methodologies or performance, based on the technical literature, analyses, test results, and other information provided by the manufacturerNOTE The agent is also called upon to witness some measurements and tests related to material qualification.

ISO 13628-10:2005

independent verification agent

independent party or group, selected by the manufacturer, that can verify the indicated methodologies or performance in the light of the technical literature, analyses, test results and other information provided by the manufacturer

ISO 13628-2:2000


NOTE The agent is also called upon to witness some measurements and tests related to material qualification.

indication visual sign of cracks, pits or other abnormalities found during liquid penetrant and magnetic particle examinations

ISO 13533:2001

indication visual sign of cracks, pits, or other abnormalities found during liquid penetrant and magnetic particle examination

ISO 13625:2002

indication response or evidence from NDT ISO 15463:2003indicatorreadout

device for displaying a condition, a current or a potentialEXAMPLES Analog and digital galvanometers, A-scan displays, warning lights, alarms.

ISO 15463:2003

indirect air preheater fluid-to-air heat transfer deviceNOTE The heat transfer can be accomplished by using a heat-transfer fluid, process stream or utility stream which has been heated by the flue gas or other means. A heat pipe air preheater uses a vaporizing/condensing fluid to transfer heat between the flue gas and air.

ISO 13705:2001

indirect heated component

vessel or heat exchanger used to increase the temperature of a fluid by heat transfer from another hot fluidNOTE Examples of hot fluids are steam, hot water, hot oil, or other heated medium.

ISO 10418:2003

induced-draught exchanger

exchanger designed with the tube bundles located on the suction side of the fan

ISO 13706:2005

induced-draught heater heater which uses a fan to remove flue gases and maintain a negative pressure in the heater to induce combustion air without a forced-draught fan

ISO 13705:2001

induction act of inducing a magnetic field in a ferromagnetic body ISO 15463:2003induction bending continuous bending process which utilizes induction heating to

create a narrow, circumferential, heated band around the material being bent

ISO 15590-1:2001

inertia force force resulting from the acceleration of reciprocating massNOTE Inertia force with respect to the crosshead pin is the summation of the products of all reciprocating masses (piston and rod assembly, and crosshead assembly including pin) and their respective accelerations.

ISO 13631:2002

inflatable packing element

packer or bridge plug packing element energized to form a seal by applying fluid pressure directly to the element

ISO 14310:2001

initial investment investment outlay for a projectNOTE Also known as CAPEX.

ISO 15663-2:2001

inlet reference point position, upstream of any pulsation suppression device, at which the purchaser's connection is madeNOTE At the inlet reference point the specified inlet conditions, such as inlet pressure, inlet temperature and NPIP, apply.

ISO 13710:2004

inlet volume flow volume flow rate determined at the conditions of pressure, temperature, compressibility and gas composition, including moisture, at the compressor inlet flange

ISO 10439:2002

inlet volume flow volume flow rate determined at the conditions of pressure, temperature, compressibility and gas composition, including moisture, at the compressor inlet flange[ISO 10439:2002, definition 3.5]

ISO 10442:2002

inlet volume flow flow rate expressed in volume flow units at the conditions of pressure, temperature, compressibility and gas composition, including moisture content, at the compressor inlet flangeNOTE To determine inlet volume flow, allowance must be made for pressure drop across pulsation suppression devices and for interstage liquid knockout.

ISO 13707:2000

inner seal <Arrangement 2 and Arrangement 3seal that is located closest to the pump impeller in the seal chamber

ISO 21049:2004

insert pump pump whose stator is inserted into the tubing using the drive ISO 15136-1:2001


stringin-service pipeline pipeline that has been commissioned for the transportation of

fluidISO 13623:2000

inside diameterDi

*inside diameter of a tube with the corrosion allowance removed; used in the design calculationsNOTE The inside diameter of an as-cast tube is the inside diameter of the tube with the porosity and corrosion allowances removed.

ISO 13704:2001

inspection process of measuring, examining, testing, gauging or otherwise comparing a unit of product with the applicable requirements

ISO 11960:2004

inspection comparison of equipment conformity to predetermined standards, followed by a determination of action required

ISO 13534:2000

inspection process of examining OCTG for possible defects or for deviation from established standards

ISO 15463:2003

inspection job inspection of one or more lots of OCTG by an agency subject to a single contract or subcontract

ISO 15463:2003

inspection lot definite quantity of product manufactured under conditions that are considered uniform for the attribute to be inspected

ISO 11960:2004

inspection lot sample one or more units of product selected from an inspection lot to represent that inspection lot

ISO 11960:2004

inspection lot size number of units of product in an inspection lot ISO 11960:2004inspection plan document providing an overview of the sequence of

inspections and tests, including appropriate resources and procedures to be referenced by the manufacturing plan

ISO 13880:1999

inspection system combination of equipment, procedures and personnel required for the detection of reference indicators

ISO 15463:2003

inspector employee of an agency qualified and responsible for one or more of the inspections or tests specified in the contract

ISO 15463:2003

installation inspector person able to perform satisfactory and independent inspection of composite pipe installations and installation work

ISO 14692-1:2002

installation safety system

arrangement of safety devices and emergency support systems to effect installation shutdownNOTE The system can consist of a number of individual process shutdowns and can be actuated by either manual controls or automatic sensors.

ISO 10418:2003

installation shutdown shutting down of all process stations of an installation production process and all support equipment for the process which are not required for emergency response and personnel safety

ISO 10418:2003

installation supervisor tradesman able to perform practical supervision of the installation and joining of composite pipes

ISO 14692-1:2002

installer party which carries out all or part of the construction and commissioning of composite pipe installations and installation work for a project

ISO 14692-1:2002

instant-on potential structure-to-electrolyte potential measured immediately after turning on all sources of applied cathodic protection current

ISO 15589-1:2003

instrument protection system

system that uses instrumentation to detect a deviation from the normal operating conditions and takes action to return the process to a safe state or prevent environmental damage, injury to personnel or asset loss

ISO 10418:2003

insulation layer additional layer added to the flexible pipe to increase the thermal insulation propertiesNOTE The layer is usually located between the outer reinforcement layer and the cover.

ISO 13628-10:2005

insulation layer additional layer added to the flexible pipe to increase its thermal insulation properties

ISO 13628-2:2000


NOTE The layer is usually located between the outer tensile armour layer and the outer sheath.

integral joint OCTG OCTG with one end threaded externally and the other end threaded internally

ISO 15463:2003

integral riser integral style C/WO riser is a riser in which the pressure-containing conduits are mounted into a common assembly or jointNOTE 1 An integral riser is typically classified as either jacketed or non-jacketed. The integral riser joint allows the production and annulus lines to be made up simultaneously.NOTE 2 A jacketed C/WO riser can also contain hydraulic control lines inside the structural housing. This type of riser is typically used in applications where high tensile or bending loads are anticipated.

ISO 13628-7:2005

integral, adj partsjoined by the forging, casting or welding process ISO 13533:2001integrated installation offshore installation which contains, on the same structure,

accommodation and utilities in addition to process and/or wellhead facilities

ISO 13702:1999

integrity probability of a system satisfactorily performing the required function under all the stated conditions within a stated period of time

ISO 10418:2003

integrity minimum structural capability required to enable the pipe system to fulfil its function

ISO 14692-1:2002

intensive measurement technique

technique which simultaneously measures pipe-to-electrolyte potentials and associated perpendicular potential gradientsNOTE The intensive measurement technique identifies coating defects and enables calculation of IR-free potentials at the defects.

ISO 15589-1:2003

interchangeable conforming in every detail, within specified tolerances, to both fit and function of a safe design but not necessarily to the form

ISO 10432:2004

interested parties The manufacturer and the purchaser of the products. ISO 11961:1996interference radial fit between the pump rotor and stator ISO 15136-1:2001intermediate sheath extruded polymer layer located between internal pressure and

outer sheathsNOTE This layer may be used either as a barrier to external fluids in smooth bore pipes or as an anti-wear layer.

ISO 13628-2:2000

internal circulating devicepumping ring

device located in the seal chamber to circulate seal chamber fluid through a cooler or barrier/buffer fluid reservoir

ISO 21049:2004

internal design pressure

maximum internal pressure at which the pipeline or section thereof is designed in compliance with this International Standard

ISO 13623:2000

internal drifting test to observe the unencumbered or unrestricted passage of a drift bar having a specific diameter and length through a side-pocket mandrel to determine its full-bore capability

ISO 17078-1:2004

internal pressure sheath

polymer layer that ensures internal fluid integrityNOTE This layer may consist of a number of sub-layers.

ISO 13628-2:2000

internal repair repair of the root pass from inside the pipe ISO 13847:2000internal test pressure differential pressure between the applied internal pressure and

external pressure at which a side-pocket mandrel is tested for burst resistance

ISO 17078-1:2004

internal thread thread on the inside surface of OCTG ISO 15463:2003internally wetted component

flow-wetted component and any component out of the flow stream, but contacted by well fluids through a port or other passage to the flow-wetted areacf. exposed component (see 3.11 in original document), flow-wetted component (see 3.13 in original document)

ISO 14310:2001

internally-mounted seal seal configuration in which the seal is mounted within the boundaries of the seal chamber and gland plate

ISO 21049:2004


interpretation process of determining the nature or forming an opinion of an indication based on objective data

ISO 15463:2003

interrupted quenching quenching in which the pipe being quenched is removed from the quenching medium while the pipe is at a temperature substantially higher than that of the quenching medium

ISO 11960:2004

intervention fixtures devices or features permanently fitted to subsea well equipment to facilitate subsea intervention tasks including, but not limited to:grasping intervention fixturesdocking intervention fixtureslanding intervention fixtureslinear actuator intervention fixturesrotary actuator intervention fixturesfluid coupling intervention fixtures

ISO 13628-4:1999

intervention system means to deploy or convey intervention tools to subsea well equipment to carry out intervention tasks including:ROV;ROT;ADS;diver.

ISO 13628-4:1999

intervention tools device or ROT deployed by an intervention system to mate or interface with intervention fixtures

ISO 13628-4:1999

intrados inner curved section of the bend arc ISO 15590-1:2001intrados inner curved section of the elbow


intumescent passive fire-protection coating which, in the presence of fire, expands to create an inert “char” layer

ISO 14692-1:2002

IR drop voltage, due to any current, developed between two points in the metallic path or in the lateral gradient in an electrolyte such as the soil, measured between a reference electrode and the metal of the pipe, in accordance with Ohm’s Law

ISO 15589-1:2003

IR drop voltage, due to any current, developed between two points in the metallic path or in the lateral gradient in an electrolyte such as seawater or seabed, measured between a reference electrode and the metal of the pipe, in accordance with Ohm’s Law

ISO 15589-2:2004

IR-free potentialpolarized potential

structure-to-electrolyte potential measured without the voltage error caused by the IR drop from the protection current or any other current

ISO 15589-1:2003

isolating joint electrically-insulating component inserted between two lengths of pipe to prevent electrical continuity between themEXAMPLE Monobloc isolating joint, isolating flange, isolating coupling.

ISO 15589-1:2003

item one or more tube bundles for an individual service ISO 13706:2005item any part, component, device, subsystem, functional unit,

equipment or system that can be individually considered[IEC 60050-191:1990]

ISO 14224:1999

item number purchaser's identification number for an item ISO 13706:2005item number purchaser’s identification number for a plate-and-frame heat

exchangerISO 15547-1:2005

item number purchaser’s identification number for a plate-fin heat exchanger

ISO 15547-2:2005

item number purchaser's identification number for a heat exchanger unit ISO 16812:2002jack-up mobile offshore unit that can be relocated and is bottom

founded in its operating modeNOTE A jack-up reaches its operational mode by lowering legs to the

ISO 19900:2002


sea floor and then jacking the hull to the required elevation.jet fireJF

ignited release of pressurized, flammable fluids ISO 13702:1999

jet fire turbulent diffusion flame resulting from the combustion of a fuel continuously released with significant momentum in a particular range of directions

ISO 14692-1:2002

job lot batch of material or components that have undergone the same process or series of processes

ISO 14310:2001

job lot group or quantity of piece parts, sub-assemblies or assemblies that are grouped or processed together during the manufacturing process

ISO 17078-1:2004

job lot traceability ability for parts to be traced as originating from a job lot which identifies the included heat(s)

ISO 10423:2003

job lot traceable the ability for parts to be identified as originating from a job lot which identifies the included heat(s)

ISO 14310:2001

job-lot traceability ability for parts to be traced as originating from a job lot which identifies the included heat(s)

ISO 13533:2001

joint means of connecting two or more componentsEXAMPLE Plain pipe to a fitting, or plain pipe to plain pipe.

ISO 14692-1:2002

Jointer Two pieces of pipe joined together by a circumferential weld. ISO 3183-2:1996jointer two pieces of pipe joined together by a circumferential weld ISO 3183-3:1999jointer weld: Circumferential seam weld that joins two pieces of pipe

together.ISO 3183-1:1996

jump over interconnecting pipework within a heater coil section ISO 13705:2001jumper short segment of flexible pipe with a connector half at either

endNOTE A jumper is commonly used to connect flowlines and/or subsea facilities together, e.g. a subsea flowline to a hard pipe riser installed on a production platform.

ISO 13628-1:2005

jumper short flexible pipe used in subsea and topside, static or dynamic applications, e.g. turret jumpers and drag chain jumpers

ISO 13628-10:2005

jumper short flexible pipe used in subsea and topside, static or dynamic applications

ISO 13628-2:2000

jumper short piece of flexible pipe ISO 13628-7:2005kelly square or hexagonally shaped steel pipe connecting the swivel

to the drill pipe that moves through the rotary table and transmits torque to the drill stem

ISO 10424-1:2004

kelly saver sub short rotary sub that is made up onto the bottom of the kelly to protect the pin end of the kelly from wear during make-up and break-out operations

ISO 10424-1:2004

label dimensionless designation for the size and style of a rotary shouldered connection

ISO 10424-1:2004

label 1 dimensionless designation for the size or specified outside diameter that may be used when ordering pipe

ISO 11960:2004

label 1 dimensionless designation for the size or specified outside diameter, used when ordering OCTG

ISO 15463:2003

label 2 dimensionless designation for the mass per unit length that may be used when ordering pipe

ISO 11960:2004

label 2 dimensionless designation for the mass per unit length or wall thickness, used when ordering OCTG

ISO 15463:2003

laminae thin sheets of reinforcing fibres in a resin matrix built up into a flat or curved arrangement

ISO 14692-1:2002

laminar flow flow property of fluids in which all layers of the fluid move parallel to each other and no material is transferred between layers

ISO 13503-1:2003


laminate, verb unite laminae with a bonding material, usually using pressure and heatNOTE Normally used with reference to flat sheets, but can also refer to tubes. A product made by such bonding is referred to as a laminate.

ISO 14692-1:2002

laminated joint butt-and-wrap jointbutt-and-strap jointbutt-welded jointjoint consisting of plain-ended pipe and fittings laminated together with reinforcing fibres and resin/hardener mixture

ISO 14692-1:2002

landing nipple receptacle containing a profile designed for the installation of a lock mandrel

ISO 16070:2005

landing string all the equipment of the riser above the tubing hanger that is contained wholly or partly within the BOP stack and up to the first standard riser jointNOTE For live well operations, the landing string typically consists of a tubing hanger running tool, subsea test tree, shear sub, retainer valve and lubricator valve. For killed well operations, the landing string typically consists of a tubing hanger running tool and tubing hanger orientation joint or slick joint.

ISO 13628-7:2005

latch retention mechanism for a flow-control device that is landed in the side-pocket mandrel

ISO 17078-1:2004

latch profile feature such as a lug or recess that is suitable for the reception of the locking mechanism within a side-pocket mandrel

ISO 17078-1:2004

lateral offset lateral distance between the centrelines of two coupled shafts that are not parallel, measured at the axial reference point of the driving machine shaftSee Figures C.3 and C.4.

ISO 10441:1999

lateral offset lateral distance between the centrelines of two coupled shafts that are not parallel, measured at the axial reference point of the driving machine shaftSee Figures C.3 and C.4. in original document

ISO 14691:1999

lay angle angle between the axis of a spiral wound element (e.g. cables of reinforcing layer) and a line parallel to the longitudinal axis of the flexible pipe

ISO 13628-10:2005

lay angle angle between the axis of a spiral wound element (e.g. armour wires) and a line parallel to the flexible pipe longitudinal axis

ISO 13628-2:2000

lay corridor corridor in which an offshore pipeline is to be installed, usually determined prior to construction

ISO 13623:2000

laying length actual length of a line, corresponding to the initial length plus the increase afforded by the fitting or integral joint when installed

ISO 14692-1:2002

lay-upcabling

operation of assembling electrical cores or optical fibres into a cable, or hoses, tubes, electric cables, optical fibre cables into a bundle, or sub-bundle

ISO 13628-5:2002

leak accidental escape from a process component of liquid and/or gaseous hydrocarbons to atmosphere

ISO 10418:2003

leak any positive displacement of fluid in the measuring system during hold periods

ISO 13679:2002

leak test pressure test to determine the presence of leaks at jointsNOTE Usually carried out at a pressure lower than the hydrotest and for a longer period.

ISO 14692-1:2002

leakage visible passage of pressurized fluid from the inside to the outside of the pressure-containment area of the equipment being tested

ISO 13533:2001

leakage concentration measure of the concentration of a volatile organic compound ISO 21049:2004


or other regulated emission in the environment immediately surrounding the seal

leakage field magnetic field forced out of the material into the air by distortion of the field within the material, caused by the presence of a discontinuity

ISO 15463:2003

leakage rate volume or mass of fluid passing between the seal faces through a seal in a given length of time

ISO 21049:2004

leak-tight leakage that is acceptable for a particular componentNOTE See 6.4.11.5.

ISO 13628-7:2005

length piece of pipe that may be plain-end, threaded, or threaded and coupled, that is in accordance with the range requirements in Table C.30 or Table E.30 of this International Standard

ISO 11960:2004

lengthjoint

complete section of pipe ISO 15463:2003

length of box threadLBT

length of threads in the box measured from the make-up shoulder to the intersection of the non-pressure flank and crest of the last thread with full thread depth

ISO 10424-1:2004

life cycle all development stages of an item of equipment or function, from when the study commences up to and including disposal

ISO 15663-1:2000

life jacket device worn by personnel which has sufficient buoyancy and stability to turn the body of an unconscious person and keep the person's mouth clear of the water

ISO 13702:1999

life-cycle cycle which comprises all development stages, from commencement of the study up to and including disposal of an item of equipment or function

ISO 15663-3:2001

life-cycle cost discounted cumulative total of all costs incurred by a specified function or item of equipment over its life cycle

ISO 15663-1:2000

life-cycle cost discounted cumulative total of all costs incurred by a specified function or item of equipment over its life-cycle

ISO 15663-3:2001

life-cycle cost model mathematical relationship between cost elements and life-cycle cost differences

ISO 15663-1:2000

life-cycle costing process of evaluating the difference between the life-cycle costs of two or more alternative options

ISO 15663-1:2000


ISO 15663-2:2001


ISO 15663-3:2001

life-jacket device worn by personnel which has sufficient buoyancy and stability in water to turn the body of an unconscious person and keep the person’s mouth clear of the water

ISO 15544:2000

lift weight weight of a component, an assembly or a module at padeyes, including temporaries and residual fluid content but excluding lifting gear

ISO 19901-5:2003

lifting device tool dedicated for lifting ISO 13628-7:2005lifting gearrigging

equipment needed during a lifting operationEXAMPLES Slings, spreader bars, lifting frames, shackles, etc.

ISO 19901-5:2003

light galling galling that can be repaired by the use of abrasive paper

ISO 13679:2002

light hydrocarbon hydrocarbon liquid that will readily boil at ambient conditionsNOTE Typically this definition includes pure and mixed streams of pentane (C5) and lighter liquids.

ISO 21049:2004

lightweightlightship

dry weight and utility systems required for a minimum operation of a floating structure

ISO 19901-5:2003

limit analysis method used to compute the resistance of a component made of ideally (rigid) plastic material

ISO 13628-7:2005

limit clamp equivalent term for a stop collar ISO 10427-2:2004


limit load load combination extreme (axial load and/or pressure) which defines the failure conditions for the connection or maximum load resulting in large permanent deformation (such as buckling) prior to catastrophic failure

ISO 13679:2002

limit state state beyond which the structure no longer fulfils the relevant design criteria

ISO 19900:2002

limit state state beyond which the structure no longer fulfils the relevant design criteria[ISO 19900:2002]

ISO 19901-7:2005

limited-end-float coupling

coupling designed to limit the axial movement of the coupled shaft ends with respect to each other and transmit an axial force of a prescribed magnitude

ISO 10441:1999

limited-end-float coupling

coupling designed to limit the axial movement of the coupled shaft ends with respect to each other and transmit an axial force of a prescribed magnitude

ISO 14691:1999

linear imperfection imperfection which includes, but is not limited to, seams, laps, cracks, plug scores, cuts and gougesNOTE See API Std 5T1.

ISO 11960:2004

linear imperfection imperfection including, but not limited to, seams, laps, cracks, plug scores, cuts and gouges

ISO 13680:2000

linear indication surface NDE indication whose length is equal to or greater than three times its width

ISO 10423:2003

linear indication liquid penetrant or magnetic particle examinationindication whose length is equal to or greater than three times its width

ISO 13533:2001

linear indication indication revealed by NDE, having a length of at least three times the width

ISO 13535:2000

linear indication indication in which the length is equal to or greater than three times its width

ISO 13625:2002

linear indication indication, revealed by non-destructive examination, having a length at least three times its width

ISO 14693:2003

linear indication material inconsistency whose length is equal to or greater than three times the width of the material inconsistency

ISO 17078-1:2004

linear mass mass per length of tubular product ISO 17078-1:2004liner layer of elastomer in contact with the internal fluid which

ensures internal fluid integrityISO 13628-10:2005

liner pipe not extending from the surface and intended to line the walls of a drilled well

ISO 14310:2001

liner continuous resin-rich coating on the inside surface of a pipe component, used to protect the laminate from chemical attack or to prevent leakage under stressNOTE The liner may also be used to provide enhanced abrasion and erosion resistance.

ISO 14692-1:2002

liner internal layer of a material different to that of the pipe bodyNOTE The liner material may be, for example, plastic or non-ferrous.

ISO 21329:2004

liner cementing annular cementing operations for which the top of the casing being cemented is not at the top the wellbore

ISO 10426-2:2003

liquefaction fluidity of cohesionless soil due to the increase in pore pressures caused by earthquake action under undrained conditions

ISO 19901-2:2004

liquid overflow discharge of liquids from a process component through a gas (vapour) outlet

ISO 10418:2003

live load load on a deck area according to its defined function ISO 19901-5:2003load physical influence which causes stress and/or strains in the

riser systemISO 13628-7:2005

load case combination of simultaneously acting loads ISO 13628-7:2005


load effect effect of a single load or combination of loads on the structure, such as stress, strain, deformation, displacement, motion, etc.

ISO 13628-7:2005

load envelope limit of loads (axial, pressure, torsion, bending, fatigue and temperature) within which a connector operates during service or is tested

ISO 21329:2004

load rating maximum operating load, both static and dynamic, to be applied to the equipmentNOTE The load rating is numerically equivalent to the design load.

ISO 13535:2000

load test test wherein a load is applied under controlled and monitored conditions to verify the serviceability of equipment

ISO 13534:2000

loading and discharge hose

flexible pipe jumper used in the loading and offloading of tankers in both static and dynamic applications

ISO 13628-10:2005

loading condition defined event or operation during which loads occurNOTE For each loading condition, all weight items and variable loads that are known or predicted to occur are identified, quantified and located.

ISO 19901-5:2003

loadout transfer of an umbilical or umbilical system from a storage facility onto an installation/shipping vessel either by transfer spooling or by lifting the product stored on its installation/shipping reel

ISO 13628-5:2002

load-out loading condition in which a major assembly or a module is transferred from land onto a floating structure by horizontal movement

ISO 19901-5:2003

local devicemounted on or near the equipment or console ISO 10437:2003local mounted on or near the equipment or console ISO 10438-1:2003local of a devicemounted on the equipment mounting plate ISO 13710:2004local (adj.) applies to any device mounted on or near the equipment or

consoleISO 13707:2000

local buckling buckling mode implying deformations of the cross-sectionNOTE This can e.g. be due to external pressure (hoop buckling) or moment (wrinkling) or a combination thereof.

ISO 13628-7:2005

location class geographic area classified according to criteria based on population density and human activity

ISO 13623:2000

lock mandrel retention device used for flow control equipment or other equipment

ISO 16070:2005

lock screwtie-down screw

threaded pin extending through the wall of a casing head or tubing head connection used to lock down hangers or energize seals

ISO 10423:2003

locking device part or an arrangement of parts for securing a valve in the open and/or closed position

ISO 14313:1999

locking device part or an arrangement of parts for securing a valve in the open and/or closed position[ISO 14313:1999]

ISO 14723:2001

longitudinal imperfection

imperfection oriented in the longitudinal or approximately longitudinal direction

ISO 15463:2003

longitudinal magnetic field

magnetic field which runs substantially parallel to the axis of the OCTG

ISO 15463:2003

longitudinal seam submerged arc-welded pipe:

Pipe having one longitudinal seam produced by the automatic submerged arc-welding process defined in 3.2.1.2 (a).

ISO 3183-1:1996

long-term distribution probability distribution of a variable over a long time scaleNOTE The time scale exceeds the duration of a sea state, in which the statistics are assumed constant (see short-term distribution in 3.29). The time scale is hence comparable to a season or to the design service life of a structure.

ISO 19901-1:2005


EXAMPLE Long-term distributions of significant wave height, significant wave height in the months May to September, individual wave heights, current speeds (such as for the vortex induced vibrations of

drilling risers), scatter diagrams with the joint distribution of significant wave

height and wave period (such as for a fatigue analysis), or a particular action effect.

long-term hydrostatic pressureLTHP

extrapolated long-term mean static failure pressure of a component with free ends based on a 20-year lifetimeNOTE LTHP is determined in accordance with ASTM D2992 Procedure B.

ISO 14692-1:2002

long-term hydrostatic strengthLTHS

extrapolated long-term mean failure strength of a plain pipe with free ends based on a 20-year lifetimeNOTE LTHS is determined in accordance with ASTM D2992 Procedure B.

ISO 14692-1:2002

loop curved section of pipe allowing change in direction of TFL flowlines

ISO 13628-3:2000

loose connection flange (studded or open-face), hub connection or other end connection (3.47) used to join together equipment, but not integral to the equipment

ISO 13533:2001

loose connector connector, as-manufactured, not intended to be made integral with another piece of wellhead and christmas tree equipmentEXAMPLE There are blind, threaded, spacer, welding neck, flanged, studded, or other loose connectors.

ISO 10423:2003

loose flange flange, as-manufactured, not intended to be made integral with equipment compliant to this International StandardEXAMPLES Types of flanges include blind, threaded, spacer, welding neck, studded or other connected adapter flanges.

ISO 10423:2003

lot pieces of steel, with the same nominal dimensions and from a single heat, which are subsequently heattreated as part of the same continuous operation (or batch)

ISO 10424-1:2004

lot Those lengths of pipe with the same specified dimensions and grade which are heat treated as part of a continuous operation (or batch), and are of a single heat of steel, or from different heats that are grouped according to a documented procedure which will ensure that the appropriate requirements of this International Standard are met.

ISO 11961:1996

lot lengths of pipe with the same specified dimensions and grade from the same heat of steel which are heat-treated as part of a continuous operation (or batch)

ISO 13679:2002

lot lengths of pipe with the same specified dimensions and grade, heat treated as part of a continuous operation (or batch), and which are of a single heat or from different heats grouped according to documented procedureNOTE The documented procedure will ensure that the appropriate requirements of this International Standard are met.

ISO 15546:2002

louvre damper damper consisting of several blades, each of which pivots about its centre and is linked to the other blades for simultaneous operation

ISO 13705:2001

low alloy steel steel with a total alloying element content of less than about 5 %, but more than specified for carbon steel

ISO 15156-1:2001

low flow in a process component, flowrate lower than the normal operating flowrate but higher than the lowest allowable working flowrate

ISO 10418:2003

low liquid level in a process component, liquid level below the normal ISO 10418:2003


operating level but above the lowest allowable working levellow pressure in a process component, pressure less than the normal

operating pressure but more than the lowest allowable working pressure

ISO 10418:2003

low temperature in a process component, temperature less than the normal operating temperature but more than the lowest allowable working temperature

ISO 10418:2003

low-alloy steel steel containing less than 5 % (mass fraction) total alloying elements, but more than that specified for carbon steelNOTE Steels with less than 11 % chromium (mass fraction) are included in this category.

ISO 10423:2003

lower confidence limitLCL

97,5 % confidence limit of the long-term hydrostatic pressure or stress based on a 20-year lifetime

ISO 14692-1:2002

lower critical temperature

temperature of a ferrous metal at which austenite begins to form during heating or at which the transformation of austenite is completed during cooling

ISO 15156-2:2003

lower flammable limitLFL

lower explosive limit LEL lowest concentration, by volume, of combustible gases in mixture with air that can be ignited at ambient conditions

ISO 10418:2003

lower heating valuehL

net heating value

higher heating value minus the latent heat of vaporization of the water formed by combustion of hydrogen in the fuel

ISO 13705:2001

lower kelly valvekelly cock

essentially full-opening valve installed immediately below the kelly, with outside diameter equal to the tool joint outside diameter, that can be closed to remove the kelly under pressure and can be stripped in the hole for snubbing operations

ISO 10424-1:2004

lower marine riser packageLMRP

upper section of a two-section subsea BOP stack consisting of the hydraulic connector, annular BOP, ball/flex joint, riser adapter, jumper hoses for the choke, kill and auxiliary lines and subsea control modulesNOTE The LMRP interfaces with the BOP stack.

ISO 13628-7:2005

lower riser package subsea equipment package which forms part of the lower workover riser package and typically consists of a WCT-BOP and tree running tool

ISO 13628-7:2005

lower workover riser package

lowermost equipment package in the riser string when configured for subsea tree installation/workover and including any equipment between the riser stress joint and the subsea tree, and typically consisting of a lower riser package and emergency disconnect packageNOTE The lower workover riser package permits well control and ensures a safe operating status whilst performing coiled tubing/wireline and well servicing operations.

ISO 13628-7:2005

lowest astronomical tideLAT

level of low tide when all harmonic components causing the tides are in phaseNOTE The harmonic components are in phase approximately once every 19 years, but these conditions are approached several times each year.

ISO 19901-1:2005

low-frequency vessel motion

motion response at frequencies below wave frequencies typically with periods ranging from 30 s to 300 s

ISO 13628-7:2005

low-stress steel stamps steel stamps that do not contain any sharp protrusions on the marking face

ISO 10424-1:2004

lubricator tube and valve assembly that permits tool-strings to be inserted into and removed from a pressurized system

ISO 13628-3:2000

lubricator valve valve assembly typically situated below the surface tree and used to isolate the reservoir from the environment when deploying long wireline/coiled tubing tool assemblies

ISO 13628-7:2005


LWRP unitized assembly that interfaces with the tree upper connection and allows sealing of the tree vertical bore(s)NOTE This may also allow disconnection from the top connection of the LWRP, to permit retrieval of the workover riser, while wireline equipment is in the tree bore(s).

ISO 13628-4:1999

machine rated speed highest rotational speed at which the machine rated torque is required to be transmitted continuously by the coupling

ISO 10441:1999

machine rated speed highest rotational speed at which the machine rated torque is required to be transmitted continuously by the coupling

ISO 14691:1999

machine rated torque Tm

maximum mean torque required to be transmitted continuously by the couplingNOTE Mean torque is the average torque over a few revolutions and does not include cyclic variations such as those associated with reciprocating machines.

ISO 10441:1999

machine rated torqueTm

maximum mean torque required to be transmitted continuously by the couplingNOTE Mean torque is the short-time average torque and does not include cyclic variations such as those associated with reciprocating machines.

ISO 14691:1999

magnetic particle finely-divided ferromagnetic material capable of being individually magnetized and attracted to distortions in a magnetic field

ISO 15463:2003

magnetic particle field indicator

device containing artificial flaws which is used to verify the adequacy or direction, or both, of a magnetic field

ISO 15463:2003

magnetizing force magnetic field strengthNOTE In the Gaussian system, the symbol is Hs and quantities are expressed in oersteds.

ISO 15463:2003

magnetometer mechanical or electronic instrument used to measure magnetic field strength

ISO 15463:2003

main oil pump oil pump that is normally in operation ISO 10438-1:2003maintainable item item that constitutes a part, or an assembly of parts, that is

normally the lowest level in the hierarchy during maintenanceISO 14224:1999

maintenance service operations performed on SSSV system equipment as part of routine operations

ISO 10417:2004

maintenance actions including inspection, adjustments, cleaning, lubrication, testing, and replacement of expendable parts, as necessary to maintain the serviceability of the equipment

ISO 13534:2000

maintenance all activities designed to retain the pipeline system in a state in which it can perform its required functionsNOTE These activities include inspections, surveys, testing, servicing, replacement, remedial works and repairs.

ISO 13623:2000

maintenance total set of activities performed during the service life of the riser to preserve its function

ISO 13628-7:2005

maintenance combination of all technical and administrative actions, including supervisory actions, intended to retain an item in, or restore it to, a state in which it can perform a required function[IEC 60050-191:1990]

ISO 14224:1999

maintenance set of activities performed during the operating life of a structure to ensure it is fit-for-purpose

ISO 19901-7:2005

maintenance man-hour accumulated durations of the individual maintenance times, expressed in hours, used by all maintenance personnel for a given type of maintenance action or over a given time interval[IEC 60050-191:1990]NOTE For more specific information, refer to Figure 191-10 "Maintenance time diagram" in IEC 60050-191.

ISO 14224:1999

major repair weld weld whose depth is greater than 25 % of the original wall thickness or 25 mm, whichever is less

ISO 13533:2001


make-and-break, verb connect and disconnect a connection ISO 10423:2003make-up shoulder sealing shoulder on a rotary shouldered connection ISO 10424-1:2004make-up tool tool to facilitate the make-up of the riser joint connectors ISO 13628-7:2005malfunction any condition of a device or equipment item that causes it to

operate improperly, but does not prevent the performance of its design function

ISO 10418:2003

malleable cast iron white cast iron that is thermally treated to convert most or all of the cementite to graphite (temper carbon)

ISO 15156-2:2003

mandrel component, or components, of a packer that contains the end connections and provides a conduit through the packer

ISO 14310:2001

mandrel core tool around which resin-impregnated reinforcement is wound to form pipes, fittings and structural shell shapes

ISO 14692-1:2002

manifold length of pipe with multiple connections for collecting or distributing drilling fluid

ISO 13501:2005

manifold assembly of pipe, valves and fittings by which fluid from one or more sources is selectively directed to various process systems

ISO 13703:2000

manifold chamber for the collection and distribution of fluid to or from multiple parallel flow paths

ISO 13705:2001

manned installation installation on which people are routinely accommodated ISO 13702:1999manned installation installation which is normally occupied ISO 15544:2000manual actuatormanual operator

wrench (lever) or handwheel with or without a gearbox ISO 14313:1999

manual operator wrench (lever) or handwheel with or without a gearbox[ISO 14313:1999]

ISO 14723:2001

manufacturer principal agent in the design, fabrication and furnishing of original SSSV system equipment

ISO 10417:2004

manufacturer principal agent in the design, fabrication and furnishing of equipment, who chooses to comply with this

ISO 10432:2004

manufacturer body responsible for the design and manufacture of the couplingNOTE The manufacturer is not necessarily the vendor.

ISO 10441:1999

manufacturer one or more of the following, depending on the context: pipe mill; processor; threader; coupling manufacturer, pup-joint manufacturer; accessory manufacturerNOTE See Clause 14.

ISO 11960:2004

manufacturer Firm, company or corporation responsible for making the product to warrant that the product conforms to this International Standard. The manufacturer may be either a pipe mill or a processor. The manufacturer is responsible for compliance with all the applicable provisions of this International Standard.

ISO 11961:1996

manufacturer individual or company that makes or processes equipment or material covered by this International Standard

ISO 13534:2000

manufacturer individual or organization that is normally responsible for the design and manufacture of the C/WO riser and its conformance with this part of ISO 13628NOTE The manufacturer can subcontract one or more of the above-mentioned tasks under its responsibility.

ISO 13628-7:2005

manufacturer company responsible for the manufacture of the interface ISO 13628-8:2002manufacturer organisation responsible for the design and manufacture of the

equipment — not necessarily the vendorISO 13707:2000

manufacturer body responsible for the design and manufacture of the couplingNOTE The manufacturer is not necessarily the vendor.

ISO 14691:1999

manufacturer party which manufactures or supplies equipment to perform ISO 14692-1:2002


the duties specified by the contractormanufacturer entity last responsible for manufacturing compliance with the

applicable product specification(s)ISO 15463:2003

manufacturer firm, company or corporation responsible for marking the productNOTE Marking by the manufacturer warrants that the product conforms to this International Standard, and it is the manufacturer who is responsible for compliance with all of its applicable provisions.

ISO 15546:2002

manufacturer individual or organization that takes responsibility for the manufacture of piping in accordance with the engineering design and in accordance with the requirements of this International StandardNOTE If a manufacturer employs subcontractors or fabricators and/or erectors for certain items, he has full control over their work.

ISO 15649:2001

manufacturer organization responsible for the design and manufacture of the equipmentNOTE 1 The manufacturer is not necessarily the vendor.NOTE 2 Adapted from ISO 13707:2000.

ISO 21329:2004

manufacturer’s rated capacity

capacity used to size the compressor ISO 13707:2000

manufacturer’s written specification

specification for the umbilical, the umbilical components and their manufacture, generated by the manufacturer in compliance with requirements specified by the purchaser and this part of ISO 13628NOTE The specification may comprise a multiplicity of documents (design plan, inspection and test plan, test procedures, etc.).

ISO 13628-5:2002

manufacturer's pressure rating

pressure rating given by manufacturer in product literature ISO 14692-1:2002

manufacturer's rated capacity

capacity of the compressor used by the manufacturer to assign its size

ISO 13631:2002

manufacturing process and action performed by an equipment supplier/manufacturer that are necessary to provide finished component(s), assembly(ies) and related documentation, that fulfil the requests of the user/purchaser and meet the standards of the supplier/manufacturerNOTE Manufacturing begins when the supplier/manufacturer receives the order and is completed at the moment the component(s), assembly(ies) and related documentation are surrendered to a transportation provider.ISO 16070

ISO 10432:2004

manufacturing process and actions performed by an equipment supplier/manufacturer that are necessary to provide finished component(s), assemblies, and related documentation, that fulfil the requests of the user/purchaser, and meet the standards of the supplier/manufacturerNOTE Manufacturing begins when the supplier/manufacturer receives the order, and is completed at the moment the component(s), assemblies, and related documentation are surrendered to a transportation provider.

ISO 14310:2001

manufacturing process and action performed by an equipment supplier/manufacturer that are necessary to provide finished component(s), assembly(ies) and related documentation, that fulfil the requests of the user/purchaser and meet the standards of the supplier/manufacturerNOTE Manufacturing begins when the supplier/manufacturer receives the order and is completed at the moment the component(s), assembly(ies) and related documentation are surrendered to a

ISO 16070:2005


transportation provider.manufacturing process(es) and action(s) performed by an equipment

supplier/manufacturer that are necessary to provide finished component(s), assemblies, and related documentation that fulfil the requests of the user/purchaser and that meet the standards of the supplier/manufacturerNOTE Manufacturing begins when the supplier/manufacturer receives the order and is completed at the moment the component(s), assembly(ies), and related documentation are transferred to a transportation provider.

ISO 17078-1:2004

manufacturing acceptance criteria

defined limits placed on characteristics of materials, products, and services established by the organization to achieve conformity to the manufacturing or service requirements

ISO/TS 29001:2003

manufacturing operation

activity involving, but not limited to, the machining, welding, heat treating or other processes utilized to produce a finished product

ISO 10423:2003

manufacturing plan document setting out the specific manufacturing practices, technical resources and sequences of activities relevant to the production of a particular product including any specified acceptance criteria at each stageNOTE 1 This plan should make reference to the applicable methods, procedures and work instructions.NOTE 2 In case of services, the manufacturing plan is often called a Service Plan.

ISO 13880:1999

manufacturing procedure specification

document prepared by the manufacturer to demonstrate how the specified properties can be achieved and verified through the proposed manufacturing route

ISO 13628-7:2005

manufacturing procedure specificationMPS

document which specifies the properties and description of the mother pipe, the bending procedure, the postbending heat treatment equipment and cycle, the qualification bend testing results, the non-destructive testing procedures and the weld end bevel details used for the manufacture of the bends

ISO 15590-1:2001


document which specifies the process control parameters and the acceptance criteria to be applied for all manufacturing, inspection and testing activities performed during fitting manufacture

ISO 15590-2:2003


document which specifies the process control parameters and the acceptance criteria to be applied for all manufacturing, inspection and testing activities performed during flange manufactureNOTE Adapted from ISO 15590-2.

ISO 15590-3:2004

Margin symbols The following symbols are used in the margin of pages or tables for indicating optional delivery conditions:M Mandatory agreement [see 5.2 a) in original document];U Unless otherwise agreed left to the discretion of the manufacturer [see 5.2 b) in original document];0 Optional agreement [see 5.2 c) in original document].

ISO 3183-2:1996

Margin symbols The following symbols are used in the margin of pages or tables to indicate options for delivery conditions:M Mandatory agreement [see 5.2 a) in original document]U Unless otherwise agreed, left to the discretion of the manufacturer [see 5.2 b) in original document]O Optional agreement [see 5.2 c) in original document]

ISO 3183-3:1999

marginal distributionmarginal probability

statistical distribution (probability) of the occurrence of a variable A that is obtained by integrating over all values of the other variables B, C, … NOTE The marginal probability of A for all values of B, C, … is

ISO 19901-1:2005


written as P(A). The concept is applicable to metocean parameters, as well as to actions and action effects.EXAMPLE When considering wave conditions, A can be the individual crest elevation for all mean zero-crossing periods B and all significant wave heights C, occurring at a particular site.

marine drilling riser tubular conduit serving as an extension of the well bore from the well control equipment on the wellhead at the seafloor to a floating drilling rig

ISO 13625:2002

marine growth living organisms attached to an offshore structure ISO 19901-1:2005marine riser coupling means of quickly connecting and disconnecting riser joints

NOTE The coupling box or pin (depending on design type) provides a support for transmitting loads from the suspended riser string to the riser-handling spider while running or retrieving the riser. Additionally, the coupling can provide support for choke and kill and auxiliary lines, and load reaction for buoyancy.

ISO 13625:2002

marking assorted marks on tubular products including marks made for inspection with paint sticks and stencils, and ball-point paint tubes

ISO 15463:2003

Marsh funnel viscosityfunnel viscosity

viscosity measured with the instrument used to monitor drilling fluidNOTE A Marsh funnel is a tapered container with a fixed orifice at the bottom so that, when filled with 1 500 cm3 of fresh water, 946 cm3 (one quart) will drain in 26 s. It is used for comparison values only and not to diagnose drilling fluid problems. See ISO 10414-1 (API RP 13B-1) and ISO 10414-2 (API RP 13B-2).

ISO 13501:2005

martensite hard, supersaturated solid solution of carbon in iron characterized by an acicular (needle-like) microstructure

ISO 15156-3:2003

martensitic steel steel in which a microstructure of martensite can be attained by quenching at a cooling rate fast enough to avoid the formation of other microstructures

ISO 15156-3:2003

mass loss corrosionweight loss corrosion (deprecated term)

loss of metal in areas exposed to fluids which contain water or brine and carbon dioxide (CO2), oxygen (O2) or other corrosive agentsNOTE The term “weight” is commonly incorrectly used to mean mass, but this practice is deprecated.

ISO 10432:2004

mast structural tower composed of one or more sections assembled in a horizontal position near the ground and then raised to the operating positionNOTE If the unit contains two or more sections, it may be telescoped or unfolded during the erection procedure.

ISO 13626:2003

mast set-up distance distance from the centreline of the well to a designated point on the mast structure defined by a manufacturer to assist in the set-up of the rig

ISO 13626:2003

master valve lowermost valve on the vertical bore of the christmas treeNOTE It is used to completely shut in the well.

ISO 10423:2003

matching pipe specified pipe grade and thickness to which the flange will be attached

ISO 15590-3:2004

material factor partial safety factor applied to the strength of the soil ISO 19901-4:2003material performance basis

capabilities which must be demonstrated, as a minimum, for material to satisfy the criteria of this International Standard

ISO 10423:2003

material requirements document listing the materials required and providing, when relevant, chemical composition, mechanical and physical properties, and any other data necessary to define materials required to provide the product, process or service to the functional specificationNOTE 1 The document may also list the applicable treatments, welding procedures and machining processes. NOTE 2 The document should contain all available information

ISO 13880:1999


regarding toxicity and any other health, safety and environment related aspects.

mating loading condition in which a major assembly supported on vessel(s) is joined onto its temporary or permanent substructure

ISO 19901-5:2003

mating ring disk- or ring-shaped member, mounted either on a sleeve or in a housing such that it does not move axially relative to the sleeve or the housing, which provides the mating seal face for the seal ring

ISO 21049:2004

matrix homogeneous resin or polymer material in which the fibre system is imbedded in a laminar arrangement

ISO 14692-1:2002

maximum allowable continuous combined rod load

highest combined rod load at which none of the forces in the running gear and the compressor frame exceeds the values that the compressor manufacturer's design permits for any component for continuous operationNOTE Running gear includes the piston, piston rod, crosshead assembly, connecting rod, crankshaft, bearings, etc.

ISO 13631:2002

maximum allowable differential pressure

highest differential pressure that can be permitted in the casing under the most severe operating conditions of minimum suction pressure and discharge pressure equal to the relief valve setting

ISO 10440-1:2000

maximum allowable differential pressure

highest differential pressure that can be permitted in the casing under the most severe operating conditions of minimum suction pressure and discharge pressure equal to the relief valve setting

ISO 10440-2:2001

maximum allowable discharge temperature

maximum continuous discharge temperature for which the manufacturer has designed the equipment

ISO 10440-1:2000

maximum allowable operating pressure

highest operating pressure allowable at any point in a pipeline system during normal flow or static conditions

ISO 10418:2003

maximum allowable operating pressureMAOP

maximum pressure at which a pipeline system, or parts thereof, is allowed to be operated

ISO 13623:2000

maximum allowable speed

highest speed at which the manufacturer’s design permits continuous operation

ISO 10437:2003


highest speed of the power input rotor at which the manufacturer's design will permit continuous operationNOTE It is expressed in revolutions per minute.

ISO 10440-1:2000


highest speed of the power input rotor at which the manufacturer's design permits continuous operationNOTE Maximum allowable speed is expressed in revolutions per minute.

ISO 10440-2:2001


highest rotational speed at which the coupling design will permit transient operation

ISO 10441:1999


highest speed at which the manufacturer's design permits continuous operation

ISO 13631:2002


highest rotational speed at which the manufacturer’s design will permit continuous operation

ISO 13691:2001


highest speed at which the manufacturer's design permits continuous operation

ISO 13709:2003


highest speed at which the manufacturer's design permits continuous operationcf. speed (3.40)

ISO 13710:2004


highest rotational speed at which the coupling design will permit transient operation

ISO 14691:1999

maximum allowable stress

specified minimum yield strength divided by the design safety factor

ISO 13535:2000


maximum allowable stress

specified minimum yield strength divided by the design safety factor

ISO 14693:2003

maximum allowable temperature

maximum continuous temperature for which the manufacturer has designed the equipment (or any part to which the term is referred) when handling the specified fluid at any specified operating conditions

ISO 10437:2003


maximum continuous temperature for which the manufacturer has designed the equipment (or any part to which the term refers) when handling the specified fluid at the specified pressure

ISO 10438-1:2003


maximum continuous temperature for which the manufacturer has designed the equipment (or any part to which the term is referred) when handling the specified fluid at the specified pressure

ISO 10439:2002


maximum continuous temperature for which the manufacturer has designed the equipment

ISO 10440-2:2001


maximum ambient temperature in the immediate vicinity of the coupling for which the manufacturer has designed the coupling

ISO 10441:1999


maximum continuous temperature for which the manufacturer has designed the equipment (or any part to which the term is referred) when handling the specified fluid at the specified pressure[ISO 10439:2002, definition 3.6]

ISO 10442:2002



ISO 13631:2002


maximum continuous temperature for which the manufacturer has designed the pump (or any part to which the term is referred) when handling the specified fluid at the specified maximum operating pressure

ISO 13709:2003


maximum continuous liquid temperature permitted by the manufacturer's design when handling the specified liquid at the specified maximum operating pressure

ISO 13710:2004


maximum temperature, in the immediate vicinity of the coupling, for which the manufacturer has designed the coupling

ISO 14691:1999


maximum continuous temperature for which the manufacturer has designed the equipment (or any part to which the term is referred) when handling the specified fluid at the specified maximum operating pressureNOTE 1 This information is supplied by the seal manufacturer.NOTE 2 The maximum allowable temperature is usually set by material considerations. This may be the material of the casing or a temperature limit imposed by a gasket or O-ring. The yield strength and ultimate strength are temperaturedependent.A component's stress level can depend on operating pressure. Thus, the margin between the strength limit of the material and the operating stress depends on both the material's operating temperature and the component's stress level. If the temperature is lowered, the material's strength increases and the stress level of the component may increase. This is the reason for associating the maximum allowable temperature to the maximum specified operating pressure.

ISO 21049:2004

maximum allowable working pressure

highest operating pressure allowable at any point in any process component, other than a pipeline, during normal operation or static conditions

ISO 10418:2003



maximum continuous pressure for which the manufacturer has designed the equipment (or any part to which the term is referred) when handling the specified fluid at the maximum allowable temperature

ISO 10437:2003


maximum continuous pressure for which the manufacturer has designed the console or components when handling the specified fluid at the maximum allowable temperature

ISO 10438-1:2003


maximum continuous pressure for which the manufacturer has designed the equipment (or any part to which the term is referred) when it is operating at the maximum allowable temperature

ISO 10439:2002


maximum continuous pressure for which the manufacturer has designed the equipment (or any part to which the term is referred) when handling the specified fluid at the specified temperature

ISO 10440-1:2000



ISO 10440-2:2001


maximum continuous pressure for which the manufacturer has designed the equipment (or any part to which the term is referred) when operating at the maximum allowable temperature[ISO 10439:2002, definition 3.7]

ISO 10442:2002

maximum allowable working pressureMAWP

maximum continuous gauge pressure for which the compressor manufacturer has designed the equipment (or relevant part thereof) when handling the specified fluid at the specified temperature

ISO 13631:2002


maximum continuous pressure for which the manufacturer has designed the pump (or any part to which the term is referred) when handling the specified fluid at the specified maximum operating temperature

ISO 13709:2003


maximum continuous pressure permitted by the manufacturer's design when handling the specified liquid at the specified maximum operating temperature

ISO 13710:2004


maximum continuous pressure for which the manufacturer has designed the equipment (or any part to which the term is referred) when handling the specified fluid at the specified maximum operating temperaturecf. static sealing-pressure rating (3.69), dynamic sealing-pressure rating (3.19)

ISO 21049:2004

maximum continuous speed

highest speed at which the turbine, as built and tested, is capable of continuous operation, at any of the specified steam conditions

ISO 10437:2003


highest rotational speed at which the machine is capable of continuous operation

ISO 10439:2002


maximum rotational speed at which the coupling is required to operate continuously but not necessarily transmitting the machine rated torqueNOTE In most cases the machine rated speed and the maximum continuous speed are the same. In some applications, however, the coupling may be required to operate at speeds above the speed at which it is required to transmit its rated torque.

ISO 10441:1999


<variable-speed unit> rotational speed at least equal to 105 % of the rated speed

ISO 13691:2001

maximum continuous <constant-speed unit> rotational speed equal to the rated ISO 13691:2001


speed speedmaximum continuous speed

highest rotational speed at which the pump, as built, is capable of continuous operation with the specified fluid at any of the specified operating conditions

ISO 13709:2003


highest speed at which the machine, as built and tested, is capable of continuous operation with the specified liquid at any of the specified operating conditionscf. speed (3.40)

ISO 13710:2004


maximum rotational speed at which the coupling is required to operate continuously but not necessarily transmitting the machine rated torqueNOTE In most cases, the machine rated speed and the maximum continuous speed are the same. In some applications, however, the coupling may be required to operate at speeds above the speed at which it is required to transmit its rated torque.

ISO 14691:1999

maximum continuous temperature

maximum ambient temperature in the immediate vicinity of the coupling, at which the coupling will be required to continuously transmit the coupling continuous rated torque at the specified operating conditions of speed and misalignment

ISO 10441:1999

maximum continuous temperature

maximum temperature, in the immediate vicinity of the coupling, at which the coupling will continuously transmit the coupling continuous rated torque at the specified operating conditions of speed and misalignment

ISO 14691:1999

maximum discharge pressure

maximum specified suction pressure plus the maximum differential pressure the pump with the furnished impeller is able to develop when operating at rated speed with fluid of the specified normal relative density (specific gravity)

ISO 13709:2003

maximum dynamic sealing pressure

highest pressure expected at the seals during any specified operating condition and during start-up and shut-down

ISO 13709:2003

maximum dynamic sealing pressureMDSP

highest pressure expected at the seal (or seals) during any specified operating condition and during start-up and shutdownNOTE In determining this pressure, consideration is given to the maximum suction pressure, the flush pressure, and the effect of clearance changes within the pump. This is a process condition and is specified by the purchaser.

ISO 21049:2004

maximum exhaust casing pressure

highest exhaust steam pressure that the purchaser requires the casing to contain, with steam supplied at maximum inlet conditionsNOTE The turbine casing is subjected to the maximum temperature and pressure under these conditions.

ISO 10437:2003

maximum exhaust pressure

highest exhaust steam pressure at which the turbine is required to operate continuously

ISO 10437:2003

maximum heat flux density

maximum local rate of heat transfer in the coil section ISO 13705:2001

maximum inlet pressure and temperature

highest inlet steam pressure and temperature conditions at which the turbine is required to operate continuously

ISO 10437:2003

maximum operating temperature

maximum temperature to which the seal (or seals) can be subjectedNOTE This is a process condition and is specified by the purchaser.

ISO 21049:2004

maximum permissible continuous combined rod load

highest combined rod load at which none of the forces in the running gear (piston, piston rod, crosshead assembly, connecting rod, crankshaft, bearings etc.) and the compressor frame exceed the values in any component that themanufacturer’s design will permit for continuous operation

ISO 13707:2000

maximum permissible continuous gas load

highest force that a manufacturer will permit for continuous operation on the static components (e.g., frame, distance

ISO 13707:2000


piece, cylinder and bolting) of the compressormaximum permissible speed

highest speed at which the manufacturer’s design will permit continuous operation

ISO 13707:2000

maximum permissible temperature


ISO 13707:2000

maximum permissible working gauge pressure (MPWGP)


ISO 13707:2000

maximum pressure differentialMPD

maximum difference between the upstream and downstream pressures across the obturator at which the obturator may be operatedNOTE Adapted from ISO 14313:1999.

ISO 14723:2001

maximum pressure differential (MPD)

maximum difference between the upstream and downstream pressure across the obturator at which the obturator may be operated

ISO 14313:1999

maximum rated static hook load

load composed of the weight of the travelling equipment and a static load applied to the travelling equipmentNOTE It is the largest load that can be applied to the structure within the guidelines imposed by this International Standard with a specified number of lines strung to the travelling block and in the absence of pipe setback, sucker rod or wind loading. A designated location of the deadline anchor and drawworks is assumed.

ISO 13626:2003

maximum rated wind velocity

largest wind velocity the derrick or mast assembly is designed to resist for a specified design loadingNOTE Maximum rated wind velocity is specified at 10 m above the ground or water surface.

ISO 13626:2003

maximum sealing pressure

highest pressure the seals are required to seal during any specified static or operating conditions and during startup and shutdown

ISO 10437:2003


highest pressure expected at the seals during any specified static or operating conditions and during start-up and shutdownNOTE Considerations should include both relief valve settings and relief-valve accumulation pressure.

ISO 10438-1:2003


highest pressure the seals are required to seal during any specified static or operating conditions and during startup and shutdown

ISO 10439:2002


highest pressure expected at the seals during any specified static or operating conditions and during startup or shutdown

ISO 10440-1:2000


highest pressure expected at the seals during any specified static or operating conditions and during start-up or shut-down

ISO 10440-2:2001

maximum static sealing pressure

highest pressure, excluding pressures encountered during hydrostatic testing, to which the seals can be subjected while the pump is shut down

ISO 13709:2003

maximum static sealing pressureMSSP

highest pressure, excluding pressures encountered during hydrostatic testing, to which the seal (or seals) can be subjected while the pump is shut downNOTE This is a process condition and is specified by the purchaser.

ISO 21049:2004

maximum suction pressure

highest suction pressure to which the pump is subjected during operation

ISO 13709:2003

maximum working load maximum working tensile load that the umbilical can continuously withstand during handling and/or in the installed configuration without suffering damage or loss of performance

ISO 13628-5:2002


NOTE As the bending radius of the umbilical decreases, the maximum working load decreases.

may is used to indicate that a provision is optional ISO 10405:2000mean current density estimated average cathodic current density for the entire

lifetime of the pipelineNOTE It is expressed in amperes per square metre.

ISO 15589-2:2004

mean sea levelMSL

arithmetic mean of all sea levels measured at hourly intervals over a long period, ideally 19 yearsNOTE Seasonal changes in mean level can be expected in some regions and over many years the mean sea level can change.

ISO 19901-1:2005

mean static offset of vessel mean static offset includes static offset due to steady forces from current, wind and wave, offset due to low-frequency motions and active positioning of the vessel

ISO 13628-7:2005

mean wind speed time-averaged wind speed, averaged over a specified time intervalNOTE The mean wind speed varies with elevation above mean sea level and the averaging time interval; a standard reference elevation is 10 m and a standard time interval is 1 h. See also sustained wind speed (3.37) and gust wind speed (3.8).

ISO 19901-1:2005

mean zero-crossing period

average period of the (up or down) zero-crossing waves in a sea stateNOTE In practice the mean zero-crossing period is often estimated from the zeroth and second moments of the wave spectrum as .

ISO 19901-1:2005

mechanical contact coupling

coupling designed to transmit torque by direct mechanical contact between mating parts and accommodate misalignment and axial displacement by relative rocking and sliding motion between the parts in contactNOTE The contacting parts may be metallic or may be made of self-lubricating nonmetallic material.

ISO 10441:1999

mechanical contact coupling

coupling designed to transmit torque by direct mechanical contact between mating parts and accommodate misalignment and axial displacement by relative rocking and sliding motion between the parts in contactNOTE 1 The contacting parts may be metallic or may be made of self-lubricating non-metallic material.NOTE 2 This category includes gear couplings (see 3.1.1.1 in original document).

ISO 14691:1999

mechanical joint joint between GRP piping components which is not made by bondingNOTE A mechanical joint typically involves use of proprietary devices.

ISO 14692-1:2002

mechanical joint joint for the purpose of mechanical strength or leak resistance or both, in which the mechanical strength is developed by threaded, grooved, rolled, flared or flanged pipe ends, or by bolts, pins, toggles or rings, and the leak resistance is developed by threads and compounds, gaskets, rolled ends, caulking, or machined and mated surfaces

ISO 15649:2001

mechanical rating gear rated power (see 3.5 in original document) multiplied by the specified gear selection factor (see 3.17 in original document).

ISO 13691:2001

mechanized welding welding process in which the welding parameters and torch guidance are controlled mechanically or electronically but may be manually varied during welding to maintain the required welding conditions

ISO 13847:2000

megohmmeter high-voltage instrument used for measuring electrical resistance

ISO 14692-1:2002


messenger wire device installed or pre-fitted into an I-tube or J-tube for transferring the primary pulling device, usually a rope, into the tube to provide means of pulling an umbilical through the tube

ISO 13628-5:2002

metal fibre reinforcement

stainless steel needles added to castable for improved toughness and durability

ISO 13705:2001

metallic diaphragm coupling

type of metallic flexible-element coupling consisting of one or more metallic flexible elements in the form of thin circular plates that are attached to one part of the coupling at their outer diameter and the other part at their inner diameter

ISO 10441:1999

metallic diaphragm coupling

coupling consisting of one or more metallic flexible elements in the form of thin circular plates that are attached to one part of the coupling at their outer diameter and the other part at their inner diameter

ISO 14691:1999

metallic disc coupling type of metallic flexible-element coupling consisting of one or more metallic flexible elements that are alternately attached to the two parts of the coupling, the attachment points being essentially equidistant from the centreline

ISO 10441:1999

metallic disc coupling coupling consisting of one or more metallic flexible elements that are alternately attached to the two parts of the coupling, the attachment points being essentially the same distance from the centreline

ISO 14691:1999

metallic flexible-element coupling

coupling that obtains its flexibility from the flexing of thin metallic discs, diaphragms or links

ISO 10441:1999

metallic flexible-element coupling

coupling that obtains its flexibility from the flexing of thin metallic discs, diaphragms or linksNOTE This category includes the two types given in 3.1.2.1 and 3.1.2.2. in original document

ISO 14691:1999

metal-to-metal seal seal or sealing system that relies on intimate and usually high contact stress of mating metal surfaces to achieve a sealNOTE The thread compound can affect, both beneficially and detrimentally, the performance of a metal seal.

ISO 13679:2002

meter minimum diameter that allows for the passage of the drift ISO 13628-7:2005microstructure structure of a metal as revealed by microscopic examination of

a suitably prepared specimenISO 15156-1:2001

mill end pipe end having the coupling, box and/or mill identification ISO 15463:2003mill hydrostatic test short-term hydrotest at the mill, or factory, used as a quality

control check which is carried out at a pressure above the design pressure

ISO 14692-1:2002

mill scale iron oxide that forms on the surface of hot steel ISO 15463:2003mill/FAT test pressure hydrostatic test pressure applied to riser components upon

completion of manufacture and fabrication to test the riser components for strength and/or tightness

ISO 13628-7:2005

minimum allowable liquid temperature

lowest liquid temperature permitted by the manufacturer's design

ISO 13710:2004

minimum allowable speed

lowest speed at which the manufacturer’s design permits continuous operation

ISO 10437:2003


lowest speed at which the manufacturer's design will permit continuous operation

ISO 10439:2002


lowest speed of the power input rotor at which the manufacturer's design will permit continuous operation for the lowest rated conditionsNOTE It is expressed in revolutions per minute.

ISO 10440-1:2000


lowest speed of the power input rotor at which the manufacturer's design permits continuous operation for the

ISO 10440-2:2001


lowest rated conditionsNOTE Minimum allowable speed is expressed in revolutions per minute.


lowest speed at which the manufacturer's design permits continuous operation

ISO 13631:2002


lowest rotational speed at which the manufacturer’s design will permit continuous operation

ISO 13691:2001


lowest speed (in revolutions per minute) at which the manufacturer's design permits continuous operation

ISO 13709:2003


lowest operating speed at which the manufacturer's design permits continuous operationcf. speed (3.40)

ISO 13710:2004

minimum bend radius radius to which a functional component may be bent during processing, reeling and unreeling, storage and installation, service and recovery without damageNOTE 1 Typical functional components which may be bent include electrical/optical fibre cable, hose, tube, umbilical, etc.NOTE 2 Minimum bend radius is measured from the centre of the bend to the functional component outer diameter on theinside of its bend, which may vary with the load applied to the component or umbilical.

ISO 13628-5:2002

minimum breaking load minimum tensile load that the umbilical can sustain before mechanical failure occurs when the load is applied with the umbilical in a straight condition

ISO 13628-5:2002

minimum breaking strengthMBS

RCS certified strength of a chain, wire rope, fibre rope or accessories

ISO 19901-7:2005

minimum continuous speed

lowest rotational speed at which the coupling is required to operate continuously

ISO 10441:1999

minimum continuous stable flow

lowest flow at which the pump can operate without exceeding the vibration limits imposed by this International Standard

ISO 13709:2003

minimum continuous thermal flow

lowest flow at which the pump can operate without its operation being impaired by the temperature rise of the pumped liquid

ISO 13709:2003

minimum design metal temperature

lowest metal temperature likely to be reached in operation, normally taken as the lowest fluid temperature to which the riser will be exposed in service

ISO 13628-7:2005


lowest mean metal temperature (through the thickness) expected in service, including operation upsets, auto-refrigeration and temperature of the surrounding environment

ISO 13709:2003


lowest metal temperature at which pressure-containing elements can be subjected to design pressureEXAMPLE Ambient temperature, process fluid temperature.

ISO 15547-1:2005


lowest metal temperature at which pressure-containing elements can be subjected to design pressureEXAMPLE Ambient temperature, process fluid temperature.

ISO 15547-2:2005

minimum exhaust pressure

lowest exhaust steam pressure at which the turbine is required to operate continuously

ISO 10437:2003

minimum inlet pressure and temperature

lowest inlet steam pressure and temperature conditions at which the turbine is required to operate continuously

ISO 10437:2003

minimum operating pressure

lowest operating pressure, at any point in the system, during normal conditions at which the system can operate effectively

ISO 13628-6:2000

minimum operating temperature

lowest ambient temperature in the immediate vicinity of the coupling, at which the coupling is required to transmit torque and/or accommodate misalignment or axial displacement

ISO 10441:1999


minimum operating temperature

lowest temperature, in the immediate vicinity of the coupling, at which the coupling is required to transmit torque and/or accommodate misalignment or axial displacement

ISO 14691:1999

minimum permissible speed

lowest speed at which the manufacturer’s design will permit continuous operation

ISO 13707:2000

minimum permissible suction pressure (for each stage)

lowest pressure (measured at the inlet flange of the cylinder) below which the combined rod load or gas load or discharge temperature, or crankshaft torque load (whichever is governing) will exceed the maximum permitted during operation at the setpoint pressure of the discharge relief valve and other specified gas conditions for the stage

ISO 13707:2000

minimum permissible temperature

lowest temperature for which the manufacturer has designed the equipment (or any part to which the term is referred)

ISO 13707:2000

minimum thicknessmin

minimum required thickness of a new tube, taking into account all appropriate allowances [see equation (5) in original document]

ISO 13704:2001

mitigation <of hazardous event> reduction of the effects of a hazardous event

ISO 13702:1999

mitigation limitation of the undesirable effects of a particular event ISO 15544:2000mitigation limitation of the undesirable effects of a particular event ISO 17776:2000mobile mooring system mooring system, generally retrievable, intended for

deployment at a specific location for a short-term operation, such as those for mobile offshore units (MOUs)

ISO 19901-7:2005

mobile offshore drilling unitMODU

structure capable of engaging in drilling and well intervention operations for exploration or exploitation of subsea petroleum resources

ISO 19901-7:2005

mobile offshore unit mobile platform, including drilling ships, equipped for drilling for subsea hydrocarbon deposits, and mobile platform for purposes other than production and storage of hydrocarbon deposits

ISO 13702:1999

mobile offshore unit mobile platform, including drilling ships, equipped for drilling for subsea hydrocarbon deposits and/or for purposes other than production and storage of hydrocarbon deposits

ISO 15544:2000

mobile offshore unitMOU

structure intended to be frequently relocated to perform a particular function

ISO 19900:2002

mobile offshore unitMOU

structure intended to be frequently relocated to perform a particular function[ISO 19900:2002]EXAMPLE Pipelaying vessel or barge, offshore construction structure, accommodation structure (floatel), service structure, or mobile offshore drilling units.

ISO 19901-7:2005

modal combination combination of response values associated with each dynamic mode of a structure

ISO 19901-2:2004

mode shape (of an acoustic pulsation resonance)

description of the pulsation amplitudes and phase angle relationship at various points in the piping systemNOTE Knowledge of the mode shape allows the analyst to understand the pulsation patterns in the piping system (see 3.1 in original document).

ISO 13707:2000

model SSSV equipment with unique components and operating characteristics which differentiate it from other SSSV equipment of the same typeNOTE The same model can have any of a variety of end connections.

ISO 10432:2004

model lock mandrel or landing nipple equipment with unique components and operating characteristics which differentiate it from other lock mandrel or landing nipple equipment of the same type

ISO 16070:2005


model side-pocket mandrels with unique components and functional characteristics that differentiate it from other side-pocket mandrels of the same typeNOTE Side-pocket mandrels can have a variety of end connections.

ISO 17078-1:2004

moderate galling galling that can be repaired by the use of fine files and abrasive paper

ISO 13679:2002

modulated differential scanning calorimetryMDSC

type of DSC (2.2.20) which enables reversible reactions to be distinguished from irreversible processes

ISO 14692-1:2002

moment simulator auxiliary device designed to simulate the effective moment of the mass of a half-coupling with respect to the center of the adjacent bearing

ISO 10441:1999

monitoring stationtest post

station where measuring and test facilities for the buried pipeline are located

ISO 15589-1:2003

monolithic lining single-component lining system ISO 13705:2001monsoon wind which blows for several months approximately from one

directionNOTE The term was first applied to the winds over the Arabian Sea which blow for six months from north-east and for six months from south-west, but it has been extended to similar winds in other parts of the world.

ISO 19901-1:2005

moonpool open access between a vessel deck and the sea, through which equipment and/or product is deployed

ISO 13628-5:2002

mooring components general class of components used in the mooring of floating structuresEXAMPLE Chain, steel wire rope, synthetic fibre rope, clump weight, buoy, winch/windlass, fairlead or anchor.

ISO 19901-7:2005

mortar refractory material preparation used for laying and bonding refractory bricks

ISO 13705:2001

most probable maximum

value of the maximum of a variable with the highest probability of occurringNOTE The most probable maximum is the value for which the probability density function of the maxima of the variable has its peak. It is also called the mode or modus of the statistical distribution.

ISO 19901-1:2005

mother joint length of pipe or coupling stock from which short lengths are cut for machining connection test specimens

ISO 13679:2002

mother pipe straight section of pipe from which an induction bend is made ISO 15590-1:2001mounting plate baseplate, skid or soleplate on which the equipment is

mountedNOTE See 7.4 for mounting plate specifications.

ISO 13710:2004

mud fluid that is circulated through the wellbore during drilling or workover operations

ISO 10426-2:2003

mud slurry of insoluble and soluble solids in either a water, synthetic or oil continuous-phase fluidcf. drilling fluid (3.1.34).

ISO 13501:2005

mud balance beam-type balance used to measure fluid density at atmospheric pressure

ISO 10426-2:2003

mud balance beam-type balance used in determining drilling fluid densityNOTE See ISO 10414-1 and ISO 10414-2.

ISO 13501:2005

mud cleaner combination of hydrocyclones and screens in series with the underflow of the hydrocyclonesNOTE The hydrocyclone overflow returns to the drilling fluid, while the underflow of the hydrocyclones is processed through a vibrating screen. The screen is usually of size API 150 or finer. The screen solids discharge is discarded while the liquid and solids passing through the screen are returned to the drilling fluid.

ISO 13501:2005


mud compartment subdivision of the removal, addition or check/suction sections of a surface system

ISO 13501:2005

mud gun submerged nozzle used to stir drilling fluid with a high-velocity stream

ISO 13501:2005

mud volcanoes diapiric intrusion of plastic clay causing high pressure gas-water seepages which carry mud, fragments of rock (and occasionally oil) to the surfaceNOTE The surface expression of a mud volcano is a cone of mud with continuous or intermittent gas escaping through the mud.

ISO 19901-2:2004

mudline suspension system

drilling system consisting of a series of housings used to support casing strings at the mudline, installed from a bottom-supported rig using a surface BOP

ISO 13628-4:1999

multicomponent lining refractory system consisting of two or more layers of different refractory typesNOTE Examples of refractory types are castable and ceramic fibre.

ISO 13705:2001

multi-coupler multiway connector arrangement comprising two stabplate sub-assemblies, one of which is made of a number of hydraulic and/or electric and/or optical coupler halves, each carrying a separate service, which mate simultaneously with corresponding coupler halves on the other sub-assembly when the two sub-assemblies are brought together

ISO 13628-5:2002

multilayer lining refractory system consisting of two or more layers of the same refractory type

ISO 13705:2001

multiple seals sealing system, which consists of more than one independent barrier, and of which each barrier forms a seal itself

ISO 13679:2002

multiple seals sealing system that consists of more than one independent barrier and of which each barrier forms a seal itself

ISO 21329:2004

multiple-package arrangement

total oil supply system whose components are separated into individually packaged unitsNOTE With this arrangement, the purchaser need only install the interconnections between the packages and the external connections.

ISO 10438-1:2003

multistage cross-over spool

flanged or other connected equipment with more than one restricted-area sealing means to provide suitable capability to suspend and seal around multiple inner strings of casing or tubing at several stagesNOTE A multistage cross-over spool may have a top connector with a pressure rating above that of the lower connector.

ISO 10423:2003

muster movement of people to a designated area so that the person in overall charge can account for all people and thereby facilitate subsequent emergency response actions

ISO 15544:2000

muster area designated area where personnel report when required to do so

ISO 13702:1999

muster area designated area to which personnel report when required to do so in an emergency

ISO 15544:2000

NACE service packers or bridge plugs whose Type 1 components are manufactured from materials that comply with NACE MR0175cf. Type 1 component (see 3.39 in original document), standard service (see 3.34 in original document)

ISO 14310:2001

natural-draught heater heater in which a stack effect induces the combustion air and removes the flue gases

ISO 13705:2001

near-size particle particle whose size is close to the size of the openings in the screen through which its passage is under evaluation

ISO 13501:2005

neat cement slurry cement slurry consisting of only cement and water ISO 10426-1:2005


neat cement slurry cement slurry consisting of only cement and water ISO 10426-2:2003net positive inlet pressureNPIP

minimum instantaneous pressure determined at the pump inlet reference point during pulsating pressure, minus the vapour pressure of the liquid at the maximum operating temperature

ISO 13710:2004

net positive inlet pressure availableNPIPA

NPIP determined by the vendor from the NPSHA and system data

ISO 13710:2004

net positive inlet pressure requiredNPIPR

minimum NPIP required by the pump to achieve the required performance with the specified liquid

ISO 13710:2004

net positive suction headNPSH

total absolute suction pressure determined at the suction nozzle and referred to the datum elevation, minus the vapour pressure of the liquidNOTE It is expressed in metres (feet) of head of the pumped liquid.

ISO 13709:2003

net positive suction headNPSH

total absolute suction pressure, determined at the underside of the mounting plate, minus the vapour pressure of the liquidNOTE It is expressed as head of water, in metres (feet).

ISO 13710:2004

net positive suction head availableNPSHA

NPSH determined by the purchaser for the pumping system with the liquid at the rated flow and normal pumping temperature

ISO 13709:2003

net positive suction head availableNPSHA

minimum value of NPSH determined to be available under any specified operating condition at the underside of the mounting plate, based on steady-state flowNOTE NPSHA is a value provided by the purchaser which can be used by the supplier to calculate the NPIPA (see 3.17). NPSHA is a function only of the system upstream of the pump and the operating conditions, and is independent of pump design.

ISO 13710:2004

net positive suction head requiredNPSHR

NPSH that results in a 3 % loss of head (first stage head in a multistage pump) determined by the vendor by testing with water

ISO 13709:2003

net present value sum of the total discounted costs and revenues ISO 15663-1:2000net present value sum of the total discounted costs and revenues ISO 15663-3:2001net weight weight (excluding any allowances or contingencies) obtained

either by estimation as estimated from early design documents or present sketches, calculated take-off from drawings or 3D model, or as given in vendor data-sheets or obtained by physical weighing

ISO 19901-5:2003

net WTOnet weight take-off

weight derived from calculated take-off or from 3D model, given in vendor data-sheets or weighed, excludingany allowances or contingencies

ISO 19901-5:2003

neutral state (of a gear coupling) state in which the meshing pairs of gear teeth are axially centrally located with respect to each other, i.e with equal scope for axial displacement in either direction

ISO 10441:1999

neutral state (of a metallic or elastomeric flexible-element type coupling) state in which there is no net axial force imposed on the coupling

ISO 10441:1999

neutral state <gear coupling> state when the meshing pairs of gear teeth are axially centrally located with respect to each other, that is with equal scope for axial displacement in each direction

ISO 14691:1999

neutral state <flexible-element coupling> state in which there is no net axial force imposed on the coupling

ISO 14691:1999

nipple section of threaded or socket-welded pipe, shorter than 300 mm, used as an appurtenance

ISO 13703:2000

nitriding case-hardening process in which nitrogen is introduced into the surface of metallic materials (most commonly ferrous

ISO 15156-2:2003


alloys)EXAMPLES Liquid nitriding, gas nitriding, ion nitriding and plasma nitriding.

no-drift length of pipe through which a drift mandrel of specified diameter will not pass without undue force

ISO 15463:2003

nominal diameter numerical designation of size that is common to all components in a piping system, other than components designated by outside diameters or by thread sizeNOTE It is a convenient round number for reference purposes and is only loosely related to manufacturing dimensions.

ISO 14692-1:2002

nominal pipe sizenominal sizeNPSDN

designation of size in inches which is common to all components in a piping system other than those components designated by outside diameterNOTE Nominal pipe size is designated by the letters NPS (when relating to inches) or DN (when relating to millimetres) followed by a number; it is a convenient number for reference purposes and it is normally only loosely related to manufacturing dimensions.

ISO 13703:2000

nominal pipe sizeNPS

designation, usually followed by a size designation number, corresponding approximately to the outside diameter of the pipe expressed in inches

ISO 13709:2003

nominal pipe sizeNPS

numerical inches designation of size which is common to components in piping systems of any one sizeNOTE The nominal pipe size is designated by the letters NPS followed by a number[ISO 14313:1999]

ISO 14723:2001

nominal pipe size (NPS) numerical inches designation of size which is common to components in piping systems of any one sizeNOTE The nominal pipe size is designated by the letters NPS followed by a number.

ISO 14313:1999

nominal pressure (PN) class

numerical pressure design class as defined in ISO 7005-1 and used for reference purposesNOTE The nominal pressure (PN) class is designated by the abbreviation PN followed by a number.

ISO 14313:1999

nominal pressure classPN class

numerical pressure design class as defined in ISO 7005-1 and used for reference purposesNOTE The nominal pressure class is designated by the letters PN followed by a number.[ISO 14313:1999]

ISO 14723:2001

nominal sizeDN

numerical metric designation of size which is common to components in piping systems of any one sizeNOTE Nominal size is designated by the letters DN followed by a number.[ISO 14313:1999]

ISO 14723:2001

nominal sizeDN

alphanumeric designation of size for components of a pipe work system, used for reference purposes, comprising the letters “DN” followed by a dimensionless whole number indirectly related to the physical size, in millimetres, of the bore or outside diameter of the end connectionsNOTE 1 The number following “DN” does not represent a measurable value and should not be used for calculation purposes except where specified in the relevant standard.NOTE 2 In those standards which use the DN designation system, any relationship between DN and component dimensions should be given, e.g. DN/OD or DN/ID.(Adapted from ISO 6708:1995, definition 2.1.)

ISO 15761:2002

nominal size (DN) numerical metric designation of size which is common to components in piping systems of any one sizeNOTE Nominal size is designated by the letters DN followed by a number.

ISO 14313:1999


nominal value dimensions as specified on the drawings and specifications ISO 13628-7:2005nominal value value assigned to a basic variable determined on a non-

statistical basis, typically from acquired experience or physical conditions

ISO 19900:2002

nominal wire rope assembly strength

nominal strength of the wire rope, multiplied by the efficiency of the end attachment in accordance with API RP 9B

ISO 13626:2003

non-conformitynon-conformance

non-fulfilment of a specified requirement ISO 14310:2001

non-contacting seal seal design in which the mating faces are designed to intentionally create aerodynamic or hydrodynamic separating forces to sustain a specific separation gap between the seal ring and the mating ringNOTE Non-contacting seals are specifically designed so that there is always an operating gap between the stationary and rotating face.

ISO 21049:2004

non-corrosive hydrocarbon service

service in which the process stream conditions do not cause significant metal mass loss, selective attack, chloride stress-corrosion cracking or sulfide stress-cracking

ISO 13703:2000

non-critical failure failure of an equipment unit which does not cause an immediate cessation of the ability to perform its required functionNOTE For well-completion equipment, see additional information in A.4.5. in original document

ISO 14224:1999

non-crosslinked fluid linear, polymer-viscosified solution or any fluid that does not exhibit significant elasticity leading to the Weissenberg effect (“bob climbing”)

ISO 13503-1:2003

non-destructive testNDT

test used to detect internal, surface and concealed defects or imperfections in materials, using techniques that do not damage or destroy the items being tested

ISO 15463:2003

non-exposed bolting bolting that is not directly exposed to sour environments and is not intended to be buried, insulated, equipped with flange protectors, or otherwise denied direct atmospheric exposure

ISO 10423:2003

non-flashing hydrocarbon

liquid hydrocarbon whose vapour pressure at any specified operating temperature is less than an absolute pressure of 0,1 MPa (1 bar) (14,7 psi), or a fluid that will not readily boil at ambient conditions

ISO 21049:2004

non-full-crested thread thread that does not have a complete thread crestEXAMPLE Black-crested thread.

ISO 15463:2003

non-hydrocarbon service

service in which the fluid, such as sour water, boiler feed water, sodium hydroxide, acids and amines, contains no hydrocarbons or the fluid has relatively small quantities of entrained hydrocarbons

ISO 21049:2004

non-integral riser riser which is made up of independent production and annulus strings or boresNOTE This type of riser is normally run with joints slightly staggered to allow conventional tubing or drill pipe-handling tools to be used for make-up of joints. Clamping the tubular members as they are assembled provides ease of handling and some structural stiffening. A non-integral C/WO riser can be grouped into two types: a drill pipe riser and a tubing riser.

ISO 13628-7:2005

non-linear imperfection imperfection which includes, but is not limited to, pits and round-bottom die stampingNOTE See API Std 5T1.

ISO 11960:2004

non-pressure flank – box

thread flank closest to the make-up shoulder where no axial load is induced from make-up of the connection or from tensile load on the drill stem member

ISO 10424-1:2004

non-pressure flank – pin

thread flank farthest from the make-up shoulder where no axial load is induced from make-up of the connection or from

ISO 10424-1:2004


tensile load on the drill stem membernon-pressure-containing weld

weld whose absence does not reduce the pressure-containing integrity of the part

ISO 10423:2003

non-pressure-containing weld

weld whose failure will not reduce the pressure-containing integrity of the component

ISO 13533:2001

nonpressure-containing/controlling parts

structural and other parts that do not contain or control pressure, such as guidebases, guideframes, and wear bushings

ISO 13628-4:1999

non-pusher seal seal in which the secondary seal is not required to slide axially to compensate for wear and misalignmentNOTE A non-pusher seal is usually the metal-bellows Type B or C.

ISO 21049:2004

normal conditions absolute pressure of 101,325 kPa and temperature of 0 °C ISO 13703:2000normal flow total amount of oil required by equipment components such as

bearings, seals, couplings, and steady-state controls excluding transient flow for controls or oil by-passed directly back to the reservoir

ISO 10438-1:2003

normal heat release design heat absorption of the heater divided by the calculated fuel efficiency

ISO 13705:2001

normal operating point point at which usual operation is expected and optimum efficiency is desiredNOTE This point is usually the point at which the vendor certifies that performance is within the tolerances stated in this International Standard.

ISO 10437:2003

normal operating point point at which normal operation is expected and optimum efficiency is desiredNOTE This point is usually the point at which the vendor certifies that the performance is within the tolerances stated in the relevant standard.

ISO 10438-1:2003

normal operating point point at which usual operation is expected and optimum efficiency is desiredNOTE This will usually be the point at which the vendor certifies that performance is within the tolerances stated in this International Standard.

ISO 10439:2002

normal operating point point at which usual operation is expected and optimum efficiency is desiredNOTE This will usually be the point at which the vendor certifies that performance is within the tolerances stated in this International Standard.[ISO 10439:2002, definition 3.11]

ISO 10442:2002

normal operating point point at which usual operation is expected and optimum efficiency is desiredNOTE This is usually that point at which the manufacturer certifies that performance is within the tolerances stated in this International Standard.

ISO 13631:2002

normal operating point point at which usual operation is expected and optimum efficiency is desiredNOTE This point is usually the point at which the manufacturer certifies that performance is within the tolerances stated in this International Standard.

ISO 13707:2000

normal operating point point at which the pump is expected to operate under normal process conditions

ISO 13709:2003

normal seal gas flow total amount of seal gas required by the equipment seals excluding transient gas flows or by-pass flows

ISO 10438-1:2003

normal speed speed corresponding to the requirements of the normal operating point

ISO 10439:2002

normal transmitted power

power at which usual operation is expected and optimum efficiency is desired

ISO 13691:2001


NOTE The normal transmitted power may be equal to or less than the gear rated power.

normalizing heating a ferrous metal to a suitable temperature above the transformation range (austenitizing), holding at temperature for a suitable time and then cooling in still air (or protective atmosphere) to a temperature substantially below the transformation range

ISO 15156-2:2003

Normalizing forming A forming process in which the final deformation is carried out within a certain temperature range leading to a material condition equivalent to that obtained after normalizing so that the specified values of the mechanical properties are retained even after normalizing. The abbreviated form of this delivery condition is N.

ISO 3183-2:1996

normalizing forming forming process in which the final deformation is carried out in a certain temperature range leading to a material condition equivalent to that obtained after normalizingNOTE 1 With normalizing forming, the specified values of the mechanical properties are retained even after normalizing.NOTE 2 The abbreviated form of this delivery condition is N.

ISO 3183-3:1999

normally open and normally closed

both on-the-shelf positions and de-energized positions of devices such as automatically controlled electrical switches and valvesNOTE The normal operating position of such a device is not necessarily the same as the device’s on-the-shelf position.

ISO 13707:2000

normal-wear part part normally restored or replaced at each pump overhaulEXAMPLES Wear rings, interstage bushings, balancing device, throat bushing, seal faces, bearings and gaskets.

ISO 13709:2003

notch reference indicator with specified geometry ISO 15463:2003notch stress range sum of the primary stress range plus the secondary stress

range plus the peak stress range, forming the total stress range (see Annex C), as applied to fatigue assessment of unwelded parts

ISO 13628-7:2005

not-to-exceed weightNTE weight

maximum acceptable weight ISO 19901-5:2003

NPIPR test running test conducted to validate the NPIPR ISO 13710:2004nubbin projection on the flange gasket surface, positioned at the

centre of the gasket, used to concentrate the bolt load on the gasket

ISO 16812:2002

objective evidence documented field experience, test data, publications, finite element analysis or calculations that verify performance characteristics, as applicable

ISO 10423:2003

observed test or inspection for which the purchaser requires notification of the timing and may wish to attendNOTE This is not a hold point. The inspection or test is performed as scheduled, and if the purchaser or the purchaser's representative is not present, the vendor proceeds to the next step.

ISO 10437:2003

observed inspection or test where the purchaser is notified of the timing of the inspection or test and the inspection or test is performed as scheduled, regardless of whether the purchaser or his representative is present

ISO 13709:2003

observed inspection [test]

inspection [test] for which the purchaser is notified of the timing, and the inspection [test] is performed as scheduled irrespective of whether the purchaser or purchaser’s representative is present

ISO 13710:2004

observed test product test which is observed at the discretion of the purchaser, who has been given notice of the test by the manufacturer, but does not constitute a manufacturing hold

ISO 21049:2004


pointobturatorclosure member

part of a valve, such as a ball, clapper, disc, gate or plug, which is positioned in the flow stream to permit or block flow

ISO 14313:1999

obturatorclosure member

part of a valve which is positioned in the flow stream to permit or block flowEXAMPLE Ball, clapper, disc, gate or plug.NOTE Adapted from ISO 14313:1999.

ISO 14723:2001

off potentialinstant-off potential

structure-to-electrolyte potential measured immediately after interruption off all sources of applied cathodic protection currentNOTE This potential is normally measured immediately after the cathodic protection system is switched off and the applied electrical current stops flowing to the bare steel surface, but before polarization has decreased.

ISO 15589-1:2003

offset horizontal component of CPL ISO 13628-6:2000offshore pipeline pipeline laid in maritime waters and estuaries seaward of the

ordinary high water markISO 13623:2000

oil country tubular goodsOCTG

casing, tubing, plain-end casing liners, pup joints, couplings, accessories and plain-end drill pipe

ISO 15463:2003

oil mist lubrication lubrication provided by oil mist produced by atomisation in a central unit and transported to the bearing housing, or housings, by compressed air

ISO 13709:2003

oil-based drilling fluid drilling fluid in which the continuous phase is not miscible with water, and water or brine is the dispersed phaseNOTE Oil-based drilling fluids are usually referred to as non-aqueous drilling fluids, or NAF.

ISO 13501:2005

one-shot welding process

process characterized by fusion or metallic bonding being induced around the entire circumference of the pipe simultaneouslyEXAMPLES Flash welding, friction welding or pressure welding.

ISO 13847:2000

on-potential structure-to-soil potential measured while the cathodic protection system is continuously operating

ISO 15589-1:2003

open area area in an open-air situation where vapours are readily dispersed by windNOTE Typical air velocities in such areas should rarely be less than 0,5 m/s and should frequently be above 2 m/s.

ISO 15138:2000

operating conditions most severe combination of environmental conditions under which a given operation will be permitted to proceedNOTE Operating conditions are determined for operations that exert a significant action on the structure. Operating conditions are usually a compromise: they are sufficiently severe that the operation can generally be performed without excessive downtime, but they are not so severe that they have an undue impact on design.

ISO 19901-1:2005

operating envelope limited range of parameters in which operations will result in safe and acceptable equipment performance

ISO 13628-7:2005

operating environment set of conditions to which the product is exposed during its full life cycle

ISO 16070:2005

operating environment set of environmental conditions to which the product is exposed during its service lifeNOTE Environmental conditions can include temperature, pressure, liquid composition and properties, gas composition and properties, solids, etc.

ISO 17078-1:2004

operating expenditure money used for operation and maintenance, including associated costs such as logistics and spares

ISO 15663-1:2000

operating expenditure money used to operate and maintain, including associated costs such as logistics and spares

ISO 15663-3:2001

operating manual publication issued by the manufacturer, which contains ISO 10417:2004


detailed data and instructions related to the design, installation, operation and maintenance of SSSV system equipment

operating manual publication issued by the manufacturer which contains detailed data and instructions related to the design, installation, operation and maintenance of equipment

ISO 10432:2004

operating mode condition that arises from the use and application of the equipment or riser systemNOTE Typical operating modes are racking of riser components, running/retrieval, landing/connecting, overpull to verify lockdown, system pressure testing, normal operation, surface shut-in, subsea shut-in, disconnecting, hang-off, overpull to retrieve tubing hanger, failure of dynamic positioning system, failure of tensioner system and failure of anchors or anchor lines.

ISO 13628-7:2005

operating pressure normal or anticipated standard internal pressure difference, i.e. internal minus external pressure, to be experienced by the pipe or piping system which should not exceed the design pressure

ISO 14692-1:2002

operating region portion of a pump’s hydraulic coverage over which the pump operates

ISO 13709:2003

operating state state when an item is performing a required function[IEC 60050-191:1990]

ISO 14224:1999

operating time time interval during which an item is in an operating state[IEC 60050-191:1990]NOTE For well-completion equipment, see additional information in A.4.5. in original document

ISO 14224:1999

operating weight sum of the dry weight and the fluid content weight ISO 19901-5:2003operational parameter requirement and/or restriction that the product is exposed to

during its service lifeEXAMPLES Operating environment, through-tubing drift, landing and retrieval of flow-control devices, passage of various tools through the side-pocket mandrel, injection of various well treatment chemicals/fluids, etc.

ISO 17078-1:2004

operational restrained test

simulation of the loads due to operational cycling on a section of pipeline that is fully axially constrained

ISO 21329:2004

operational unrestrained test

simulation of the loads due to operational cycling on a section of pipeline or riser that is not axially constrained and may have axial tension due to self-weight or externally applied tension

ISO 21329:2004

operator user of SSSV system equipment[ISO 10432]

ISO 10417:2004

operator company which physically operates the ROV (delivery system) ISO 13628-8:2002operator individual, partnership, firm or corporation having control or

management of operations on the leased area or a portion thereofNOTE The operator may be a lessee, designated agent of the lessee(s), or holder of operating rights under an approved operating agreement.

ISO 13702:1999

operator device (or assembly) for opening or closing a valve ISO 14313:1999operator party which assumes ultimate responsibility for the operation

and maintenance of the piping systemNOTE The operator may or may not be the same as the principal or principal's agent.

ISO 14692-1:2002

operator device (or assembly) for opening or closing a valve[ISO 14313:1999]

ISO 14723:2001

operator person present throughout the inspection or testing process who is responsible for the unit, operates the controls and observes the readout to detect imperfections

ISO 15463:2003


orienting bushings non-pressure-containing parts which are used to orient equipment or tools with respect to the wellhead

ISO 13628-4:1999

orienting profile design feature (e.g. orienting sleeve) of a side-pocket mandrel that acts together with certain wireline tools to aid in radial and vertical alignment of tools used to install and remove side-pocket landed equipment

ISO 17078-1:2004

orifice designed restriction which causes the pressure drop in velocity-type SSCSVs

ISO 10417:2004

orifice nipple pipe nipple made of solid bar stock with an orifice hole drilled through it to regulate the flush flowNOTE Orifice nipples are commonly found on Plan 11 systems.

ISO 21049:2004

O-ring elastomeric sealing ring with an O-shaped (circular) cross-section, which may be used as a secondary seal or as a gasket

ISO 21049:2004

other end connectionOEC

connection which is not specified in an ISO standardNOTE This includes ISO flanges and hubs with non-ISO gasket preparations and manufacturer's proprietary connections.

ISO 13533:2001

outboard tree piping subsea tree piping which is downstream of the first tree wing valve and upstream of flowline connector (see flow loop)

ISO 13628-4:1999

outer seal <Arrangement 2 and Arrangement 3seal located farthest from the pump impeller

ISO 21049:2004

outer sheath polymer layer used to protect the pipe against penetration by sea water and other external environments, corrosion, abrasion and mechanical damage, and to keep the tensile armours in position after forming

ISO 13628-2:2000

out-of-roundness difference between the maximum and minimum diameters of the bar or tube, measured in the same crosssection, and not including surface finish tolerances outlined in 8.1.4

ISO 10424-1:2004

out-of-roundness deviation of the circumference from a circleNOTE This can be an ovalization, i.e. an elliptic cross-section, or a local out-of-roundness, e.g. flattening. The numerical definition of out-of-roundness and ovalization is the same.

ISO 13628-7:2005

outside diameterDo

outside diameter of a new tube ISO 13704:2001

ovality irregularity of the circular section of a component, quantified by the difference in the largest and smallest cross-sectional axes

ISO 14692-1:2002

ovalization deviation of the circumference from a circle which has the form of an elliptic cross-section

ISO 13628-7:2005

overflowcentrate

discharge stream from a centrifugal separation that contains a higher percentage of liquids than does the feed

ISO 13501:2005

overhung pump pump whose impeller is cantilevered from its bearing assembly

ISO 13709:2003

overpressure in a process component, pressure in excess of the maximum allowable working pressureNOTE For pipelines, the maximum allowable working pressure is the maximum allowable operating pressure.

ISO 10418:2003

owner final recipient of the equipment who may delegate another agent as the purchaser of the equipment

ISO 10437:2003

owner individual, legal entity or organization holding legal title to the equipment

ISO 13534:2000

owner final recipient of the equipmentNOTE The owner may delegate another body or agent as the purchaser of the equipment.

ISO 13707:2000

owner entity having ownership of the new OCTG at the time inspection is contracted, specifying the type of inspection or testing to be conducted and authorizing its performance

ISO 15463:2003


NOTE The owner might be the purchaser.owner individual or organization responsible for establishing the

requirements for design, construction, examination, inspection and testing which govern the entire fluid handling or process facility of which the piping is partNOTE The owner is normally the individual or organization that purchases the piping system and/or is responsible for operating the facility.

ISO 15649:2001

owner representative of the company or companies which own a development, who can be the operator on behalf of co-licensees

ISO 19901-7:2005

package total system, or part of a system, whose components are mounted on a single baseplateNOTE A package is complete in all respects, including controls and instrumentation.

ISO 10438-1:2003

packaged compressor compressor unit, stationary or mobile (portable), as supplied by the manufacturer, fully piped and wired, including power transmission, primer mover, filters and flow rate controlNOTE A canopy may be provided with the compressor for sound insulation and/or weather protection. Packaged compressors may also include starting equipment, intercoolers, aftercoolers, silencers, moisture separators, dryers, outlet filters, minimum pressure devices, outlet valves, check valves, etc.

ISO 10440-2:2001

packaged equipment assembly of individual pieces or stages of equipment, complete with interconnecting piping and connections for external pipingNOTE The assembly may be mounted on a skid or other structure prior to delivery.

ISO 15649:2001

packaging enclosure(s) of sufficient structural integrity to protect contents from damage or contamination, including impacts and environmental conditions encountered during the various phases of transport

ISO 10417:2004

packer mechanical device, not installed in a designed receptacle, used for blocking fluid (liquid or gas) communication through the annular space between conduits by sealing off the space between them

ISO 14310:2001

packing element seal on a packer or bridge plug that blocks fluid communication by sealing on the ID of the conduitcf. bridge plug (see 3.2 in original document), packer (see 3.26 in original document)

ISO 14310:2001

panel enclosure used to mount, display and protect gauges, switches and other instruments

ISO 10437:2003


ISO 10438-1:2003


ISO 13707:2000


ISO 13710:2004

parallel offset lateral distance between the centrelines of two coupled shafts that are parallel but not in the same straight lineSee Figure C.1.

ISO 10441:1999

parallel offset lateral distance between the centrelines of two coupled shafts that are parallel but not in the same straight lineSee Figure C.1. in original document

ISO 14691:1999

parking system system whereby tools/equipment for a particular tubing size are transported through a flowline of a larger size by a transport (carrier) piston string which is left behind or "parked"

ISO 13628-3:2000


outside the well while the remaining equipment continues into the tubing

part individual piece used in the assembly of single equipment unitsEXAMPLES Body, bonnet, gate, stud, handwheel, etc., are parts of a valve. A part may also be a piece not in finished form.

ISO 10423:2003

part individual piece used in the assembly of a single unit of equipment

ISO 13533:2001

part factor f1 ratio of the 97,5 % confidence limit of LTHP to the mean value of LTHP

ISO 14692-1:2002

part factor f2 derating factor related to confidence in the pipework system, the nature of the application and the consequences of failure

ISO 14692-1:2002

part factor f3 part factor that takes account of non-pressure-related axial loads, e.g. bending

ISO 14692-1:2002

partial pressure pressure that would be exerted by a single component of a gas if present alone, at the same temperature, in the total volume occupied by the mixtureNOTE For a mixture of ideal gases, the partial pressure of each component is equal to the total pressure multiplied by its mole fraction in the mixture, where its mole fraction is equal to the volume fraction of the component.

ISO 15156-1:2001

particle discrete unit of solid material that consists of a single grain or of any number of grains stuck together

ISO 13501:2005

particle size distribution mass, or net volume, classification of solid particles into each of the various size ranges as a percentage of the total solids of all sizes in a fluid sample

ISO 13501:2005

passstream

flow circuit consisting of one or more tubes in series ISO 13705:2001

pass plate plate used to change the direction of flow of a stream in a plate-and-frame heat exchanger with two or more passes

ISO 15547-1:2005

passive analysis portion of the acoustic simulation in which a constant flow amplitude modulation over an arbitrary frequency range is imposed on the system, normally at the cylinder valve locationsNOTE The resulting transfer function defines the acoustic natural frequencies and the mode shapes over the frequency range of interest (see 3.1 in original document).

ISO 13707:2000

passive fire protectionPFP

coating or cladding arrangement or free-standing system which, in the event of fire, will provide thermal protection to restrict the rate at which heat is transmitted to the object or area being protected

ISO 13702:1999

passive fire protection method of minimizing fire damage by use of sacrificial or non-combustible coatings

ISO 14692-1:2002

payback period period after which the initial capital invested has been paid back by the accumulated net revenue earned

ISO 15663-1:2000

PCPprogressing cavity pump

pump consisting of a stator and a rotor whose geometry of assembly is such that it creates two or more series of lenticular, spiral, separate cavities

ISO 15136-1:2001

peak stress part of stress, which is additive to the respective primary and secondary stresses, to form the total stressNOTE Peak stresses do not cause any noticeable distortion and are only important to fatigue and brittle fracture in conjunction with primary and secondary stresses.

ISO 13628-7:2005

penumbra shadow produced on a radiographic image when the incident radiation is partially, but not wholly, cut off by an intervening bodyNOTE It is the region of geometric unsharpness around the image of

ISO 13847:2000


an indication.perceptible leak any leak during a hydro test that can be observed ISO 17078-1:2004perfect thread length design length from the end of pipe or coupling to a specified

locationISO 15463:2003

performance standard defined limit placed on characteristics of materials, products or services

ISO 14692-1:2002

performance test running test conducted to confirm the pump's mechanical and volumetric efficiency

ISO 13710:2004

period of roll, pitch or heave>time required for a complete cycle ISO 13626:2003

permanent guidebase structure that sets alignment and orientation of the wellhead system and provides entry guidance for running equipment on or into the wellhead assembly

ISO 13628-4:1999

permanent mooring system

mooring system normally used to moor floating structures deployed for long-term operations, such as those for a floating production system (FPS)

ISO 19901-7:2005

permanent packer [bridge plug]

packer [bridge plug] that has no design feature for intact removal from the conduit, necessitating substantial destruction for its removal

ISO 14310:2001

permeability measure of the capacity of a porous medium to allow flow of fluids or gasesNOTE Permeability is usually expressed in millidarcy, mD.

ISO 10426-2:2003

permeability measure of the ease with which material can become magnetizedNOTE Permeability is the ratio of flux density and magnetizing force, i.e. B/H.

ISO 15463:2003

petroleum refinery industrial plant for the processing or handling of petroleum and products derived directly from petroleumNOTE A petroleum refinery may be an individual gasoline recovery plant, a treating plant, a gas processing plant (including liquefaction) or an integrated refinery having various process units and attendant facilities, and may include supporting and service facilities such as storage, utility and waste treatment units.

ISO 15649:2001

phenolic class of polymer resins made from phenol and formaldehyde, and cured by air drying or heat bakingNOTE Chemical resistance can be further increased via heat and catalyst treatment.

ISO 14692-1:2002

physical explosion explosion arising from the sudden release of stored energy such as from failure of a pressure vessel, or high voltage electrical discharge to earth

ISO 13702:1999

piggyback two pipes attached at regular intervals with clampsNOTE Either or both of the pipes can be flexibles.

ISO 13628-10:2005

piggyback two pipes attached at regular intervals with clampsNOTE Either or both of the pipes may be flexible.

ISO 13628-2:2000

pilot small burner that provides ignition energy to light the main burner

ISO 13705:2001

pin end external (male) threads of a threaded connection ISO 10424-1:2004pin end externally-threaded end of a pipe without a coupling applied ISO 15463:2003pinion high-speed rotor, or rotors, of the integral gear ISO 10442:2002pinion higher speed gear element in mesh ISO 13691:2001pipe casing, tubing, plain-end casing liners and pup joints as a

groupISO 11960:2004

pipe oil field casing, tubing, plain-end casing liners, pup joints and plain-end drill pipe

ISO 15463:2003

pipe pressure-tight cylinder used to convey a fluid or to transmit a fluid pressure

ISO 15649:2001


NOTE Pipe is ordinarily designated “pipe” in applicable material specifications. Materials designated “tube” or “tubing” in the specifications are treated as pipe when intended for pressure service.

Pipe body For welded pipe the entire pipe excluding the weld(s) and heat affected zone(s); for seamless pipe the entire pipe.

ISO 3183-2:1996

pipe body <welded pipe> the entire pipe excluding the weld(s) and heat-affected zone(s)

ISO 3183-3:1999

pipe body <seamless pipe> the entire pipe ISO 3183-3:1999pipe lean angle between the vertical and a typical stand of pipe in the

setbackISO 13626:2003

pipe mill firm, company or corporation that operates pipe-making facilities

ISO 11960:2004

pipe mill Firm, company or corporation that operates pipe making facilities.

ISO 11961:1996

pipe mill firm, company or corporation that operates pipe-making facilities

ISO 15546:2002

pipe pup short piece of pipe with length typically equivalent to one or two times its diameter, welded directly to the valve to prevent valve seal damage from girth welding, for transition of valve material to pipeline strength properties, or to provide a valve end mating the pipeline dimensions

ISO 14723:2001

pipe ram closing and sealing component in a ram blowout preventer that seals around tubulars in the wellbore

ISO 13533:2001

pipe string pipe body and the connection ISO 13679:2002pipe support pipe fixture or structural attachment which transfers the load

from the pipe or structural attachment to the supporting structure or equipmentNOTE 1 Fixtures include hanging-type fixtures such as hanger rods, spring hangers, sway braces, counterweights, turnbuckles, struts, chains, guides and anchors; and bearing-type fixtures such as saddles, bases, rollers, brackets and sliding supports.NOTE 2 Structural attachments include elements which are bonded or moulded into the pipe, such as clips, lugs, rings, clamps, clevises, straps and skirts.

ISO 14692-1:2002

pipeline piping which directs fluids from subsea manifolds to an installation, between installations or between an installation and a shore facility

ISO 10418:2003

pipeline those facilities through which fluids are conveyed, including pipe, pig traps, components and appurtenances, up to and including the isolating valves

ISO 13623:2000

pipeline those facilities through which fluids are conveyed, including pipe, pig traps, components and appurtenances up to and including the isolating valves[ISO 13623:2000]

ISO 21329:2004

pipeline design life period of time selected for the purpose of verifying that a replaceable or permanent component is suitable for the anticipated period of service

ISO 13623:2000

pipeline on land pipeline laid on or in land, including lines laid under inland water courses

ISO 13623:2000

pipeline system pipeline with compressor or pump stations, pressure control stations, flow control stations, metering, tankage, supervisory control and data acquisition system (SCADA), safety systems, corrosion protection systems, and any other equipment, facility or building used in the transportation of fluids

ISO 13623:2000

pipeline system pipe with components subject to the same design conditions and typically used to transport fluids between wells and field facilities, field facilities and processing plants, processing

ISO 14692-1:2002


plants and storage facilitiespiping assemblies of piping components used to convey, distribute,

mix, separate, discharge, meter, control or restrict fluid flowsISO 14692-1:2002

piping assemblies of piping components used to convey, distribute, mix, separate, discharge, meter, control or snub fluid flowsNOTE Piping also includes pipe-supporting elements, but does not include support structures such as building frames, bents or foundations.

ISO 15649:2001

piping componentcomponent

mechanical element suitable for joining or assembly into a pressure-tight fluid-containing piping systemEXAMPLES Pipe, fittings, flanges, gaskets, bolting, valves, and devices such as expansion joints, flexible joints, pressure hoses, liquid traps, strainers and in-line separators.

ISO 14692-1:2002

piping component mechanical element suitable for joining together or assembly into pressure-tight fluid-containing piping systemsEXAMPLE Pipe, tubing, fittings, flanges, gaskets, bolting, valves and devices such as expansion joints, flexible joints, pressure hoses, traps, strainers, in-line portions of instruments, and separators.

ISO 15649:2001

piping design code recognized piping standard specified or agreed by the purchaserEXAMPLE ASME B31.3.

ISO 10442:2002

piping system interconnected piping subject to the same set or sets of design conditionsNOTE The piping system also includes pipe supports, but does not include support structures.

ISO 14692-1:2002

piping system interconnected piping subject to the same set or sets of design conditions

ISO 15649:2001

piping system design code

recognized piping system design standard specified or agreed by the purchaserEXAMPLE ASME B31.3

ISO 10438-1:2003

piston loadplunger load

force acting on one piston or plunger during any portion of the pumping cycle

ISO 13710:2004

piston pump reciprocating pump having a seal attached to the piston and moving within a cylinder

ISO 13710:2004

pit depression or cavity that can be caused by corrosion or removal of rolled-in or extraneous material

ISO 15463:2003

pitch nominal distance between two adjacent threads roots or crests ISO 13628-7:2005pitch length distance between two crests belonging to the same seal line

NOTE The rotor and stator have different pitch lengths, pr and ps respectively (see Figures E.1, E.2 and F.1 in original document).

ISO 15136-1:2001

pitting resistance equivalent numberPRENFPREN

number, developed to reflect and predict the pitting resistance of a CRA, based upon the proportions of Cr, Mo, W and N in the chemical composition of the alloyNOTE See 6.3 for further information.

ISO 15156-3:2003

plain-end casing liner casing provided unthreaded and with a wall thickness often greater than that specified for J55

ISO 11960:2004

plain-end pipe pipe without threads or tool-joint ISO 15463:2003planar imperfection imperfection lying in one geometric plane that is normally

parallel to, and within, the outer and inner surfacesISO 15463:2003

plastic viscosity measure of the high-shear-rate viscosity which depends upon the number, shape and size of solids and the viscosity of the liquid phaseNOTE Plastic viscosity is calculated by subtracting the 300 r/min concentric cylinder viscometer reading from the 600 r/min concentric cylinder viscometer reading (see ISO 10414-1 and ISO 10414-2).

ISO 13501:2005

plastically deformed permanently deformed by stressing beyond the limit of elasticity, i.e. the limit of proportionality of stress to strain

ISO 15156-2:2003


plate sheet of material precision-pressed or -formed into a corrugated pattern

ISO 15547-1:2005

plate chevron angle angle formed between the corrugated plate pattern and the horizontal

ISO 15547-1:2005

plate gapb

height to the underside of a corrugation of a plateSee Figure 2.

ISO 15547-1:2005

plate pack grouping of all plates contained within a frame ISO 15547-1:2005plate-and-frame heat exchanger

assembly of a gasketed, semi-welded or welded plate pack and its supporting frameSee Figure 1.

ISO 15547-1:2005

plate-fin heat exchanger heat exchanger consisting of a block (core) of alternating layers (passages) of corrugated finsSee Figure 2.NOTE 1 The layers are separated from each other by parting sheets and sealed along the edges by means of side bars, and are provided with inlet and outlet ports for the streams. The block is bounded by cap sheets at the top and bottom.NOTE 2 All the layers carrying the same stream are connected together by headers (inlet, outlet, intermediate) directly attached by welding onto the brazed core.

ISO 15547-2:2005

platform complete assembly including structure, topsides and, where applicable, foundations

ISO 19900:2002

platform piping any piping intended to contain or transport fluid on a platform ISO 13703:2000plenumwindbox

chamber surrounding the burners that is used to distribute air to the burners or reduce combustion noise

ISO 13705:2001

plug catcher device at the bottom of the tubing hanger annulus bore to prevent the wireline plug from passing through the tubing hanger when an annulus string is not used

ISO 13628-4:1999

plug cementing process of placing a volume of cement in a well to form a plug across the wellbore

ISO 10426-2:2003

plug header cast return bend provided with one or more openings for the purpose of inspection or mechanical tube cleaning

ISO 13705:2001

plug valve valve assembly with a plug permanently mounted across the conduit so that, when rotated 90°, it effects a closureEXAMPLES Plugs may be straight, tapered, ball, etc.

ISO 10423:2003

plugging wedging or jamming of openings in a screening surface by near-size particles, preventing passage of undersize particles and leading to the blinding of the screen (see blinding)

ISO 13501:2005

plunger pump reciprocating pump having a uniform-section plunger that moves in a static seal

ISO 13710:2004

pneumatic power system

system which supplies pressure to operate pneumatic actuators

ISO 10418:2003

pocket parallel bore, including sealing surfaces and latching profiles, that is offset from and essentially parallel with the through-bore of the side-pocket mandrel

ISO 17078-1:2004

Poisson’s ratio ratio of axial strain to the corresponding hoop strain below the proportional limit

ISO 14692-1:2002

polar low depression that forms in polar air, often near a boundary between ice and sea

ISO 19901-1:2005

polymerizing fluid fluid which is in the process of changing, or is capable of changing, from one chemical composition to another with longer-chain components and different properties, usually becoming significantly more viscous and/or tacky

ISO 21049:2004

pool fire combustion of flammable or combustible liquid spilled and retained on a surface

ISO 13702:1999

port inlet or outlet opening in the plate ISO 15547-1:2005


port fluid passageway, typically located in the gland plate ISO 21049:2004position indicator device to show the position of the valve obturator ISO 14313:1999position indicator device to show the position of the valve obturator

[ISO 14313:1999]ISO 14723:2001

possum belly compartment, or back tank, on a shale shaker into which the flow line discharges, and from which drilling fluid is either fed to the screens or is bypassed, if necessary

ISO 13501:2005

postcure additional elevated-temperature cure, usually without pressure, to improve final resin properties and/or complete the cure, or decrease the percentage of volatiles in the compoundNOTE In certain resins, complete cure and ultimate mechanical properties are attained only by exposure of the cured resins to temperatures higher than those of curing.

ISO 14692-1:2002

post-weld heat treatment

any heat treatment subsequent to welding, including stress relief

ISO 10423:2003

post-weld heat treatmentPWHT

any heat treatment subsequent to welding, including stress relief

ISO 13533:2001

pot life length of time that a catalysed thermosetting resin system retains a viscosity low enough to enable processing and sufficient reactivity to achieve specified properties after processing

ISO 14692-1:2002

potential maximum power

approximate maximum power to which the turbine can be uprated at the specified normal speed and steam conditions when it is furnished with suitable (that is, larger or additional) nozzles and, possibly, with a larger governor-controlled valve or valves

ISO 10437:2003

potential unbalance maximum probable net unbalance of a complete coupling after installationNOTE 1 Potential unbalance results from a combination of the residual unbalance of individual components and subassemblies and possible eccentricity of the components and subassemblies due to run-out and tolerances of the various locating surfaces and registers. Since it may be assumed that the actual values of the various contributory unbalances are random in both magnitude and direction, the numerical value of the potential unbalance is the square root of the sum of the squares of the maximum likely values of all the contributory unbalances. Typical contributory unbalances are:the measured residual unbalance of each component or subassembly;errors in the balance of each component or subassembly resulting from eccentricity in the fixture used to mount the component or subassembly in the balancing machine;the unbalance of each component or subassembly due to eccentricity resulting from clearance or run-out of the relevant registers or fits.NOTE 2 The concept of potential unbalance is explained more fully and a worked example is given in annex B.

ISO 10441:1999

potential unbalance maximum probable net unbalance of a complete coupling after installationNOTE 1 Potential unbalance results from a combination of the residual unbalance of individual components and subassemblies and possible eccentricity of the components and subassemblies due to run-out and tolerances of the various locating surfaces and registers.NOTE 2 The numerical value of the potential unbalance is the square root of the sum of the squares of all the contributory unbalances. Typical contributory unbalances are:the measured residual unbalance of each component or subassembly;

ISO 14691:1999


errors in the balance of each component or subassembly resulting from eccentricity in the fixture used to mount the component or subassembly in the balancing machine;the unbalance of each component or subassembly due to eccentricity resulting from clearance or run-out of the relevant registers or fits.NOTE 3 The concept of potential unbalance is explained more fully and a worked example is given in annex B.

powder-dry sufficiently dry to allow any type of powder, when applied to the surface, to be blown from the surface without residue remaining

ISO 15463:2003

power operated fail closed valve

hydraulically or electrically actuated valve designed to fail to the closed position

ISO 13628-4:1999

power pump reciprocating pump consisting of a power end and a liquid end connected by a frame or distance pieceNOTE 1 The power end of a power pump transmits energy from a rotating shaft to pistons or plungers by means of a crankshaft, connecting rods and crossheads.NOTE 2 The liquid end of a power pump consists of the cylinders, the pistons or plungers, and the valves.

ISO 13710:2004

powered actuatorpowered operator

electric, hydraulic or pneumatic device bolted or otherwise attached to the valve for powered opening and closing of the valve

ISO 14313:1999

powered operatorpowered actuator

electric, hydraulic or pneumatic device bolted or otherwise attached to the valve for powered opening and closing of the valve[ISO 14313:1999]

ISO 14723:2001

power-tight threaded connection that has been fully made up by mechanical means, using power tongs or a screw-on machine

ISO 15463:2003

pozzolan siliceous or siliceous and aluminous material which in finely divided form reacts with calcium hydroxide to form a cementitious materialNOTE See Clause 17 for further description.

ISO 10426-2:2003

preferred operating region

portion of a pump’s hydraulic coverage over which the pump’s vibration is within the base limit of this International Standard

ISO 13709:2003

preflush, noun fluid containing no insoluble weighting agents used to separate drilling fluids and cementing slurries

ISO 10426-2:2003

preliminary anticipated system acceleration head

estimated pressure change due to changes in fluid velocity in the piping systemNOTE This is an important factor in the application of reciprocating pumps because of the pulsating nature of the flow in the pump suction line. For additional information on acceleration heads, see Annex E.

ISO 13710:2004

preload compressive bearing load developed between box and pin members at their interface; this is accomplished by elastic deformation induced during make-up of the coupling

ISO 13625:2002

present value value of the project cash flow excluding the initial investment outlay

ISO 15663-2:2001

pressure armour layer structural layer, with a lay angle close to 90°, that increases the resistance of the flexible pipe to internal and external pressure and to mechanical crushing loadsNOTE The layer also structurally supports the internal pressure sheath and typically consists of an interlocked metallic construction, which may be backed up by a flat metallic spiral layer.

ISO 13628-2:2000

pressure cap cap designed to contain internal pressure in the event of seal leakage or to prevent ingress due to hyperbaric pressure

ISO 14723:2001

pressure casing composite of all stationary pressure-containing parts of the ISO 10437:2003


unit, including all nozzles and other attached partspressure casing composite of all stationary pressure-containing parts of the

unit, including all nozzles and other attached partsISO 10440-1:2000

pressure casing composite of all stationary pressure-containing parts of the unit, including all nozzles and other attached parts

ISO 10440-2:2001

pressure casing composite of all the stationary pressure-containing parts of the unit

ISO 10442:2002

pressure casing composite of all stationary pressure-containing parts of the pump, including all nozzles, seal glands, seal chambers and other attached parts but excluding the stationary and rotating members of mechanical seals

ISO 13709:2003

pressure casing composite of all the stationary pressure-containing parts of the seal, including seal chamber, seal gland plate, and barrier/buffer fluid reservoir and other attached parts, but excluding the seal ring and the mating ring

ISO 21049:2004

pressure class numerical pressure design class expressed in accordance with either the nominal pressure (PN) class or the ANSI rating classNOTE In this International Standard, the pressure class is stated by the PN class followed by the ANSI rating class between brackets.

ISO 14313:1999

pressure class numerical pressure design class expressed in accordance with either the nominal pressure class or the ANSI rating classNOTE 1 In this International Standard the pressure class is stated by the PN class, followed by the ANSI rating class between parentheses.NOTE 2 Adapted from ISO 14313:1999.

ISO 14723:2001

pressure class numerical pressure design class expressed in accordance with either the nominal pressure (PN) class or the ANSI rating classNOTE In this part of ISO 15590, the pressure class is stated by the PN class followed by the ANSI rating class between brackets.[ISO 14313:1999]

ISO 15590-3:2004

pressure controlling parts

those parts intended to control or regulate the movement of pressurized fluids, such as valve bore sealing mechanisms and hangers

ISO 13628-4:1999

pressure design code recognized pressure vessel design standard specified or agreed by the purchaserEXAMPLE ASME BPVC-VIII

ISO 10438-1:2003

pressure design code recognized pressure vessel standard specified or agreed by the purchaser (e.g. ASME VIII)

ISO 10439:2002

pressure design code recognized pressure vessel standard specified or agreed by the purchaserEXAMPLE ASME VIII.

ISO 10440-1:2000

pressure design code recognized pressure vessel standard specified or agreed by the purchaserEXAMPLE ASME Boiler and Pressure Vessel Code, Section VIII.[ISO 10439:2002, definition 3.14]

ISO 10442:2002

pressure design code recognized pressure vessel standard specified or agreed by the purchaserEXAMPLE ASME Boiler and Pressure Vessel Code, Section VIII.

ISO 13705:2001

pressure design code recognized pressure vessel standard specified or agreed by the purchaserEXAMPLE ASME Section VIII.

ISO 13706:2005

pressure design code recognized pressure vessel standard or code specified or agreed by the purchaser (e.g. ASME, Boiler and Pressure Vessel Code 1998, Section VIII)

ISO 13707:2000

pressure design code recognized pressure vessel standard specified or agreed by ISO 15547-1:2005


the purchaserEXAMPLE ASME Section VIII, EN 13445.

pressure design code recognized pressure vessel standard specified or agreed by the purchaserEXAMPLE ASME Section VIII, EN 13445.

ISO 15547-2:2005

pressure design code recognized pressure vessel standard specified or agreed by the purchaserEXAMPLE ASME Boiler and Pressure Vessel Code, Section VIII.

ISO 16812:2002

pressure drop difference between the inlet and the outlet static pressures between termination points, excluding the static differential head

ISO 13705:2001

pressure end load axial load resulting from internal pressure applied to the area defined by the maximum seal diameter

ISO 13533:2001

pressure integrity structural and leak-resistant capability of a product to contain applied pressure

ISO 10423:2003

pressure rating number relating to the pressure for which a system is suitableNOTE The number may relate directly to the rated working pressure (e.g. ISO 10423 [1] pressure rating 13,8 MPa and API pressure rating 2 000 psi) or may have a more indirect correlation (e.g. ASME class 300).

ISO 13703:2000

pressure ratingrated pressure

rating for a component, relating to its long-term resistance to failure when subjected to either static or standardized cyclic internal pressure loading

ISO 14692-1:2002

pressure reversal changing the pressure differential from above to below the product or vice versa

ISO 14310:2001

pressure safety valve self-actuated valve that opens when pressure is higher or lower than a set value

ISO 10418:2003

pressure sensor device designed to detect a predetermined pressure ISO 13703:2000pressure stress multiplierPSM

fractional increase in hoop stress loading due to applied axial loads acting on a fitting

ISO 14692-1:2002

pressure vessel vessel in a consistometer into which the slurry container is placed for the thickening time test

ISO 10426-1:2005

pressure vessel vessel in a consistometer into which the slurry container is placed for the thickening-time test

ISO 10426-2:2003

pressure vessel quality metallic material specified for pressure-containing or pressure-controlling parts conforming to the applicable product specification level requirement

ISO 10423:2003

pressure-boundary penetration

device which penetrates directly into or communicates with the wellbore and is not defined elsewhere in this International StandardEXAMPLES Grease or sealant injection fitting; check valve; control, test or gauge port plug and fitting, needle valve on test, gauge or injection port; electric and control line penetration.

ISO 10423:2003

pressure-containing part

part whose failure to function as intended would result in a release of retained fluid to the atmosphereEXAMPLES Bodies, bonnets and stems.

ISO 10423:2003

pressure-containing partpressure-containing member

part exposed to wellbore fluids whose failure to function as intended would result in a release of wellbore fluid to the environmentEXAMPLES Bodies, bonnets and connecting rods.

ISO 13533:2001

pressure-containing part

part that acts as a barrier between process or motive liquid and the atmosphereEXAMPLES Liquid cylinder, discharge manifold, suction manifold, stuffing box, cylinder plugs and covers (if in contact with process fluid), valve seats (if a portion is in contact with the atmosphere), power cylinder, gas cylinder head, valve chest, valve chest cover and

ISO 13710:2004


heads.pressure-containing part

part designed to contain the pipeline fluidEXAMPLES Bodies, bonnets, glands, stems, gaskets and bolting.NOTE Adapted from ISO 14313:1999.

ISO 14723:2001

pressure-containing parts

those parts whose failure to function as intended would result in a release of retained fluid to the environmentEXAMPLES Bodies, bonnets and stems.

ISO 13628-4:1999


parts, such as bodies, bonnets, glands, stems, gaskets and bolting, designed to contain the pipeline fluid

ISO 14313:1999


those parts whose failure to function as intended would result in a release of retained fluid to the atmosphereNOTE Examples are valve bodies, bonnets and stems.

ISO 15156-2:2003

pressure-containing weld

weld whose absence reduces the pressure-containing integrity of the part

ISO 10423:2003

pressure-containing weld

weld whose failure will reduce the pressure-containing integrity of the component

ISO 13533:2001

pressure-controlling part

part intended to control or regulate the movement of pressurized fluidsEXAMPLES Valve bore sealing mechanisms, choke trim and hangers.

ISO 10423:2003

pressure-controlling partpressure-controlling member

part intended to control or regulate the movement of wellbore fluidsEXAMPLES Packing elements, rams, replaceable seats within a pressure-containing member or part.

ISO 13533:2001

pressure-controlling part

part intended to block or permit the flow of fluidsEXAMPLE Seat and obturator.NOTE Adapted from ISO 14313:1999.

ISO 14723:2001

pressure-controlling parts

parts, such as seat and obturator, intended to block or permit the flow of fluids

ISO 14313:1999

pressure-down rateRpd

rate at which pressure is reduced from the bottom-hole pressure, pBH, to the pressure at the top of cement column, pTOC, during a thickening-time test

ISO 10426-2:2003

pressure-limiting valve accumulation pressure

pressure at which a pressure-limiting valve discharges the pump-rated flow

ISO 13710:2004

pressure-limiting valve set pressure

pressure at which a pressure-limiting valve starts to release pressure

ISO 13710:2004

pressure-retaining partpressure-retaining member

part not exposed to wellbore fluids whose failure to function as intended will result in a release of wellbore fluid to the environmentEXAMPLES Closure bolts and clamps.

ISO 13533:2001

pressure-retaining part part whose failure would allow process or motive fluid to escape to the atmosphereEXAMPLES Pressure-containing parts (3.30) and liquid and gas cylinder bolting, stuffing box bolting, gland bolting, glands, and covers that constrain plugs and valve stops, but not parts such as packing, gaskets, pistons, plungers, piston rings, rods, valves, seats (if completely surrounded by pressure-containing parts), and internal bolting.

ISO 13710:2004

pressure-up rateRpu

rate at which pressure is increased from the starting pressure to the bottom-hole pressure during a thickening-time test

ISO 10426-2:2003

pressurized curing vessel

vessel used for curing a sample of cement under temperature and pressure for compressive strength testing

ISO 10426-2:2003

prevention <of hazardous event> reduction of the likelihood of a hazardous event

ISO 13702:1999

prevention <of hazards> reduction of the likelihood of a hazardous event ISO 15544:2000preventive maintenance maintenance carried out at predetermined intervals or

according to prescribed criteria, and intended to reduce the ISO 14224:1999


probability of failure or the degradation of the functioning of an item[IEC 60050-191:1990]

primary air portion of the total combustion air that first mixes with the fuel ISO 13705:2001primary equipment pieces of equipment that cannot normally be isolated from well

fluid or well pressureISO 10423:2003

primary intervention all work carried out during the scheduled intervention task ISO 13628-9:2000primary load axial load to which the equipment is subjected in operation ISO 13534:2000primary load axial load which equipment is subjected to in operations ISO 13535:2000primary load load which is independent of structural deformation in the riser

and induces an internal force that is necessary to satisfy the laws of static equilibriumNOTE The internal force acts as long as the load is applied, and does not diminish when yielding occurs.EXAMPLE Internal pressure, external hydrostatic pressure, self-weight, contents and buoyancy of the riser.

ISO 13628-7:2005

primary load load that arises within the equipment when the equipment is performing its primary design function

ISO 14693:2003

primary load-carrying component

component of the equipment through which the primary load is carried

ISO 14693:2003

primary method <for evacuation> preferred method of leaving the installation in an emergency

ISO 13702:1999

primary method <of evacuation> preferred method of leaving the installation in an emergency which can be carried out in a fully controlled manner under the direction of the person in charge

ISO 15544:2000

primary seal gas dry, filtered gas supplied to the high pressure side of a self-acting gas sealNOTE Primary seal gas is either supplied from the compressor discharge or from an external source. When supplied from an external source, it is referred to as seal buffer gas (see 3.1.32).

ISO 10438-1:2003

primary stress stress that satisfies the laws of equilibrium of pressure, external force and moment (i.e. load effects)NOTE 1 Regarding the mechanical behaviour of a structure, the basic characteristic of this type of stress is that in case of (non-admissible) increment of external load, the deformations upon full plasticification of the section considerably increases without being self-limiting.NOTE 2 Regarding primary stress, distinction is made between membrane stress and bending stress with respect to their distribution across the cross-section governing the load-carrying behaviour. Primary membrane stress is defined as the average value of the respective stress components distributed over the section governing the load-carrying behaviour. Primary bending stress is defined as primary stress distributed linearly across the considered section and proportional to the distance from the neutral axis.NOTE 3 Regarding the distribution of membrane stress along the wall, distinction is made between general primary membrane stress and local primary membrane stress. Membrane stress due to gross structural discontinuities (e.g. integral attachments) is considered as local.

ISO 13628-7:2005

primary-load-carrying component


ISO 13534:2000

primary-load-carrying component


ISO 13535:2000

prime pipe pipe meeting all of the specified inspection and testing requirements

ISO 15463:2003

principal party that initiates the project and ultimately pays for its design and construction

ISO 14692-1:2002


NOTE The principal generally specifies the technical requirements and is ultimately responsible for ensuring that safety and all other issues are addressed. The principal may also include an agent or consultant, authorized to act for the principal.

probabilistic seismic hazard analysisPSHA

framework permitting the identification, quantification and rational combination of uncertainties in earthquakes' intensity, location, rate of recurrence and variations in ground motion characteristics

ISO 19901-2:2004

probability of exceedance

probability that a variable (or that an event) exceeds a specified reference level given exposure timeEXAMPLES Examples of probabilities of exceedance during a given exposure time are the annual probability of exceedance of a specified magnitude of ground acceleration, ground velocity or ground displacement.

ISO 19901-2:2004

probability of failure frequency of occurrence of a product, process or service failure happening within one year divided by the total number of the particular products, processes or services in operation during the same year

ISO/TR 13881:2000

procedure series of steps to be carried out in a logical order for a defined operation or in a given situation

ISO 17776:2000

process component single functional piece of production equipment and associated piping used on processing and injection facilitiesEXAMPLES Separator, heater, pump, tank.

ISO 10418:2003

process component single functional piece of production equipment and associated pipingEXAMPLES Pressure vessel, heater, pump, etc.

ISO 13703:2000

process of quenching hardening of a ferrous alloy by austenitizing and then cooling rapidly enough so that some or all of the austenite transforms to martensite

ISO 10424-1:2004

process of tempering reheating a quench-hardened or normalized ferrous alloy to a temperature below the transformation range and then cooling to soften and remove stress

ISO 10424-1:2004

process shutdown isolation of a given process station from the overall process by closing appropriate shutdown valves

ISO 10418:2003

process shutdown controlled sequence of events that ensures that the well is secured against accidental release of hydrocarbons to the environment

ISO 13628-7:2005

process station one or more process components performing a specific process function such as separation, heating, pumping

ISO 10418:2003

process valve any valve located downstream of the tree wing valves in the production flow path

ISO 13628-1:2005

processor firm, company or corporation that operates facilities capable of heat-treating pipe made by a pipe mill

ISO 11960:2004

processor Firm, company or corporation that operates facilities capable of heat treating pipe made by a pipe mill.

ISO 11961:1996

processor firm, company or corporation that operates facilities capable of cutting the threads and assembly of the pipe with the tool joints

ISO 15546:2002

process-wetted part part exposed directly to the pipeline fluidNOTE Adapted from ISO 14313:1999.

ISO 14723:2001

process-wetted parts parts exposed directly to the pipeline fluid ISO 14313:1999product pipe, coupling, accessory, coupling stock or coupling blank,

either individually or collectively as applicableISO 11960:2004

product family model or type of specific equipment listed in clause 1 of this International Standard

ISO 13533:2001

product family component type all of whose variants have the same functionEXAMPLES Plain pipe, bend, tee, reducer, etc.

ISO 14692-1:2002


product family representative

component that is taken to be representative of that particular product family (2.2.100)NOTE Examples include plain pipe, pipe plus joint, elbows and reducers, tees, and flanges. Also included are fabrication processes used in the factory or on-site, that are not qualified as part of the process for manufacturing stock items.

ISO 14692-1:2002

product functional-testing grade

category based on a defined range of processes, method(s) and/or test(s) that are used by the supplier/manufacturer to demonstrate that a particular side-pocket mandrel has been manufactured to fully meet the functional and manufacturing requirements for that product

ISO 17078-1:2004

product sector subdivision of a product family (2.2.100) that groups variants into specific diameter and pressure ranges

ISO 14692-1:2002

product sector representative

component variant taken to be representative of that product sector (2.2.102) and upon which the basic qualification testing is performed

ISO 14692-1:2002

product specification level

degree of controls applied on materials and processes for the primary-load-carrying components of the equipmentNOTE The two product specification levels are identified by the code PSL 1 or PSL 2.

ISO 13535:2000

product specification level

level of material and process controls placed upon the primary load-carrying components of the covered equipment

ISO 13626:2003

product temperature margin

difference between the vaporization temperature of the fluid at the seal chamber pressure and the actual temperature of the fluidNOTE For pure fluids, the vaporization temperature is the saturation temperature at seal chamber pressure; for mixed fluids, the vaporization temperature is the bubble-point temperature at the seal chamber pressure.

ISO 21049:2004

production/injection conduit

tubulars and equipment which provide the flow path between the reservoir and the christmas tree, including the riser for subsea applications

ISO 16070:2005

profile feature that is designed for the reception of a locking mechanism

ISO 10432:2004

profile internal conduit configuration (receptacle) used to engage tools

ISO 13628-3:2000

profile feature designed to receive the lock mandrel's locking mechanism

ISO 16070:2005

project management dedicated management personnel with the task of implementing weight policy, objectives and procedures

ISO 19901-5:2003

proof load test production load test performed to validate the load rating of a unit

ISO 13535:2000

proof load test production load test undertaken to validate the structural soundness of the equipment

ISO 14693:2003

proof test test specified by the manufacturer which is performed to verify that the SSSV meets those requirements of the technical specification which are relevant to the validation testing performance

ISO 10432:2004

proportional limit greatest stress which a material is capable of sustaining without deviation from linear proportionality of stress and strain

ISO 14692-1:2002

protection cap cover to protect valve parts from mechanical damageNOTE A pressure cap may also be used for protection.

ISO 14723:2001

protection device instrument or item of equipment used within a protection system

ISO 10418:2003

protection potential structure-to-electrolyte potential for which the metal corrosion rate is insignificant

ISO 15589-1:2003

protection potential structure-to-electrolyte potential for which the metal corrosion ISO 15589-2:2004


rate is insignificantprotective coating corrosion-resistant material applied to a metal surface

EXAMPLE Coating on casing plates behind porous refractory materials to protect against sulfur in the flue gases.

ISO 13705:2001

proximity closeness in distanceNOTE 1 Mooring systems are considered to be in proximity to a surface installation (or facility) if any part of the other installation lies within a contour described by the set of offsets coinciding with each line reaching 100 % MBS in the intact or redundancy check condition, whichever is larger.NOTE 2 Mooring systems are considered to be in proximity to a sea floor installation (or facility) if any part of the other installation lies within a polygon formed by the anchor locations.

ISO 19901-7:2005

prying magnification of an external load by a pseudo-lever action when the load is an eccentric tensile load

ISO 13628-7:2005

pull-in head device used for terminating the end of a flowline or umbilical so that it can be loaded/offloaded from a vessel and pulled along the seabed and/or through an I-tube or J-tube

ISO 13628-1:2005

pull-in head device used for terminating the end of an umbilical so that it can be loaded/offloaded from a vessel and pulled along the seabed and/or through an I-tube or J-tubeNOTE In some designs the terminated armours may be used to anchor the umbilical at the top of the I-tube or J-tube. It normally comprises a streamlined cylindrical housing into which the umbilical armouring is terminated and within which the ends of the functional components are contained. It is usually capable of rapid disassembly to access the components for post-pull-in tests and monitoring. A form of pull-in head may also be used at the subsea end of the umbilical.

ISO 13628-5:2002

pull-in head part of the pull-in system acting as attachment point for the end of the pull-in wire

ISO 13628-9:2000

pulse wave of short duration ISO 15463:2003pulser electronic device and probe for generating a controlled-

magnitude magnetic pulse, used for standardizing transducersISO 15463:2003

pump efficiencypump mechanical efficiency

ratio of the pump's hydraulic power to its power input ISO 13710:2004

pump manufacturer agency that designs, manufactures, tests and provides service support for the pumpNOTE The pump manufacturer may also purchase the sealing system and perform the installation.

ISO 21049:2004

pup joint casing, tubing or plain-end casing liner of length shorter than Range 1

ISO 11960:2004

pup joint joint of pipe or tubing shorter than standard length ISO 13628-7:2005pup joint short pipe length usually with threaded ends ISO 13679:2002pup-joint material standard casing or tubing, or thick-wall tubes or mechanical

tubes, or bar stock used for the manufacture of pup jointsISO 11960:2004

purchaser agency that issues the order and specification to the vendorNOTE The purchaser may be the owner of the plant in which the equipment is to be installed or the owner’s appointed agent.

ISO 10437:2003

purchaser body that issues the order and the specification for the coupling to the vendorNOTE The purchaser may be the end user, the end user’s agent or the vendor of the driving or driven machine.

ISO 10441:1999

purchaser party responsible for both the definition of requirements for a product order and for payment for that order

ISO 11960:2004


purchaser organization that buys the C/WO riser system on behalf of the user and/or operator or for its own use

ISO 13628-7:2005

purchaser individual or organization that issues the order and specification to the vendorNOTE The purchaser may be the owner of the plant in which the equipment is to be installed, or the owner´s agent (often the vendor of the equipment to be driven by the gear).

ISO 13691:2001

purchaser individual or organization that issues the order and specification to the vendorNOTE The purchaser may be the owner or the owner’s agent.

ISO 13707:2000

purchaser owner, or owner’s agent, that issues the order and specification to the vendor

ISO 13709:2003

purchaser issuer of the order and specification to the vendorNOTE The purchaser can be the owner of the plant in which the equipment is to be installed or the owner's appointed agent.

ISO 13710:2004

purchaser body that issues the order and the specification to the vendorNOTE The purchaser may be the end user or the end user’s agent or the vendor of the driving or driven machine.

ISO 14691:1999

purchaser entity that has purchased directly from the manufacturer the new OCTG being inspectedNOTE The purchaser might be the owner.

ISO 15463:2003

purchaser agency that issues the order and specifications to the vendor ISO 21049:2004purchaser individual or organization that issues the order and

specification to the vendorNOTE The purchaser may be the owner or the owner's agent.[ISO 13707:2000]

ISO 21329:2004

pure oil mist lubrication dry sump>systems in which the mist both lubricates the bearing(s) and purges the housing and there is no oil level in the sump

ISO 13709:2003

purge oil mist lubrication

<wet sump>systems in which the mist only purges the bearing housing

ISO 13709:2003

pusher seal seal in which the secondary seal is mounted between the seal ring on the flexible element and the sleeve or seal gland plate in which this secondary seal slides axially to compensate for wear and misalignment

ISO 21049:2004

qualification process of demonstrating that a component is in accordance with the requirements of ISO 14692-2

ISO 14692-1:2002

qualified part part manufactured under a recognized quality assurance programme and, in the case of replacement, produced to meet or exceed the performance of the original part produced by the original equipment manufacturer (OEM)NOTE ISO 9001 is an example of a recognized quality assurance programme.

ISO 10417:2004

qualified part part manufactured under a recognized quality assurance programme and, in the case of replacement, produced to meet or exceed the performance of the original part produced by the original equipment manufacturer (OEM)NOTE ISO 9001 is an example of a recognized quality assurance programme.ISO 10417

ISO 10432:2004

qualified personnel personnel with characteristics or abilities, gained through training and/or experience as measured against established requirements, standards or tests, that enable the individual to perform a required function

ISO 10417:2004

qualified personnel individual with characteristics or abilities gained through training, experience, or both, as measured against the established requirements of the manufacturer/purchaser/this

ISO 10423:2003


International Standardqualified personnel individual with characteristics or abilities gained through

training, experience or both, as measured against themanufacturer's established requirements

ISO 13533:2001

qualified personnel individuals with characteristics or abilities gained through theory and training and/or experience as measured against the manufacturer’s established requirements

ISO 13628-7:2005

qualified pressure component pressure rating determined in accordance with qualification requirements given in 2.2.104

ISO 14692-1:2002

qualified stress hoop stress based on the qualified pressure (2.2.105) ISO 14692-1:2002quality conformance to specified requirements ISO 13628-10:2005quality conformance to specified requirements ISO 13628-2:2000quality assurance those planned, systematic corrective and preventive actions

which are required to ensure that materials, products or services will meet specified requirements

ISO 13628-10:2005

quality assurance planned, systematic and preventive actions which are required to ensure that materials, products or services will meet specified requirements

ISO 13628-2:2000

quality control inspection, test or examination to ensure that materials, products or services conform to specified requirements

ISO 13628-10:2005

quality control inspection, test or examination to ensure that materials, products or services conform to specified requirements

ISO 13628-2:2000

quality programme established documented system to ensure quality ISO 13628-10:2005quality-control grade category based on a defined range of processes and/or

method(s) that are used by the supplier/manufacturer to assure the quality of the materials and manufacturing process(es) used to produce a particular side-pocket mandrel

ISO 17078-1:2004

quarter, verb mix and divide into four specimens to assure homogeneity of specimens

ISO 10416:2002

quench crack crack in steel resulting from stresses produced during the transformation from austenite to martensiteNOTE This transformation is accompanied by an increase in volume.

ISO 11960:2004

quench hardeningquenching

heat treatment requiring austenitization followed by cooling, under conditions such that austenite transforms into martensiteNOTE 1 Quench hardening is often followed by tempering. NOTE 2 Adapted from ISO 4885.

ISO 13680:2000

quench, noun neutral fluid, usually water or steam, introduced on the atmospheric side of the seal to retard formation of solids that may interfere with seal movement, or for other purposes

ISO 21049:2004

quenched and tempered

quench hardened and then tempered ISO 15156-2:2003

Quenching and tempering A heat treatment consisting of quench hardening followed by tempering. Quench hardening implies austenitization followed by cooling, under conditions such that austenite transforms more or less completely into martensite and possibly into bainite. Tempering implies heating to a specific temperature (<Ac1) ne or more times or holding at this temperature, followed by cooling at an appropriate rate so that the structure is modified and the specified properties are achieved.The abbreviated form of this delivery condition is Q.

ISO 3183-2:1996

quenching and tempering

heat treatment consisting of quench hardening followed by temperingNOTE 1 Quench hardening implies austenitization followed by cooling, under conditions such that austenite transforms more or less completely into martensite and possibly into bainite.

ISO 3183-3:1999


NOTE 2 Tempering implies heating to a specific temperature below the lower transformation temperature (Ac1) one or more times or holding this temperature, followed by cooling at an appropriate rate so that the structure is modified and the specified properties are achieved.NOTE 3 The abbreviated form of this delivery condition is Q.

quill-shaft coupling coupling designed to accommodate angular misalignment, parallel (or lateral) offset and torsional fluctuations by elastic deformation of a relatively long slender shaftNOTE Quill-shaft couplings cannot normally accommodate axial displacement.

ISO 10441:1999

racking platform platform located at a distance above the working floor for laterally supporting the upper end of racked pipe

ISO 13626:2003

radially [vertically] split <casing joints> transverse to the shaft centreline ISO 10440-1:2000radially split split with the principal joint perpendicular to the shaft

centrelineISO 10437:2003

radially split casing or other component in which the main joint is perpendicular to the axis of the shaft

ISO 10439:2002

radially split split with the principal joint perpendicular to the shaft centreline

ISO 13709:2003

radially split casing casing with joints that are transverse to the shaft centerline ISO 10440-2:2001radiant section portion of the heater in which heat is transferred to the tubes

primarily by radiationISO 13705:2001

radiation losssetting loss

heat lost to the surroundings from the casing of the heater and the ducts and auxiliary equipment (when heat recovery systems are used)

ISO 13705:2001

ram blowout preventer blowout preventer that uses metal blocks with integral elastomer seals to seal off pressure on a wellbore with or without tubulars in the bore

ISO 13533:2001

ratcheting progressive inelastic deformation or strain which can occur in a component that is subjected to variations of mechanical stress, thermal stress, or both (thermal stress ratcheting is partly or wholly caused by thermal stress)NOTE Ratcheting results in a plastic deformation, which increases by about the same amount at each cycle and quickly leads to an unacceptable value.

ISO 13628-7:2005

rated capacity capacity, in cubic metres per hour, required by the rated conditions

ISO 10440-1:2000

rated capacity volume flowrate required by the rated conditionsNOTE Rated capacity is expressed in cubic metres per hour.

ISO 10440-2:2001

rated conditions specified conditions at which operation is expected and/or optimum efficiency is expected

ISO 10440-1:2000

rated conditions specified conditions at which operation is expected and/or optimum efficiency is expected

ISO 10440-2:2001

rated discharge pressure

highest pressure required to meet the conditions the purchaser specifies for the intended service

ISO 10440-1:2000


highest pressure required to meet the conditions the purchaser specifies for the intended service

ISO 10440-2:2001


highest pressure required to meet the specified operating conditions

ISO 10442:2002


highest pressure required to meet the conditions specified by the purchaser for the intended service

ISO 13631:2002


highest pressure required to meet the conditions specified by the purchaser for the intended service

ISO 13707:2000

rated discharge temperature

predicted actual operating temperature resulting from rated conditions

ISO 10440-1:2000

rated discharge predicted actual operating temperature resulting from rated ISO 10440-2:2001


temperature conditionsrated discharge temperature

highest predicted operating temperature resulting from any specified operating condition

ISO 13707:2000

rated flow total volume of liquid actually delivered per unit time at rated operating conditions, normalised to inlet conditionsNOTE Rated flow includes liquid and any dissolved or entrained gases or solids specified.

ISO 13710:2004

rated input speed specified (or nominal) rated speed of the driver, as designated by the purchaser

ISO 13691:2001

rated load nominal applied loading condition used during coupling design, analysis and testing, based on a maximum anticipated service loadingNOTE Under the rated working load, no average section stress in the riser coupling exceeds allowable limits established in this International Standard.

ISO 13625:2002

rated load maximum operating load, both static and dynamic, to be applied to the equipmentNOTE The rated load is numerically equivalent to the design load.

ISO 14693:2003

rated operating point operating point at which the rated volume flow and the rated discharge pressure are attained

ISO 10442:2002

rated operating point point at which the vendor certifies that pump performance is within the tolerances stated in this International StandardNOTE Normally the rated operating point is the specified operating point with the highest flow.

ISO 13709:2003

rated operating speed speed required to meet the conditions specified by the purchaser for the intended serviceNOTE This speed is equal to the maximum continuous speed for constant speed compressor units.

ISO 10442:2002

rated output speed specified (or nominal) rated speed of the driven equipment, as designated by the purchaser.NOTE In selecting the number of teeth for the pinion and gear, it is often impracticable for the vendor to match exactly both the rated input and the rated output speeds designated on the data sheets. The purchaser therefore indicates which of the two is specified (that is, must be exactly adhered to by the vendor) and which is nominal (that is, permits some variation). The letter S is used to indicate the specified speed, and the letter N to indicate the nominal speed. The purchaser also indicates on the data sheets the allowable percentage of variation in the designed gear ratio.

ISO 13691:2001

rated power greatest turbine power specified and its corresponding speed; it includes all the margin required by the specifications of the driven equipment

ISO 10437:2003

rated power maximum power the compressor and any shaft-driven appurtenances require for any of the rated conditions, including the effect of any equipment (such as pulsation suppression devices, process piping, intercoolers, aftercoolers, and separators) furnished by the compressor vendor

ISO 10440-1:2000

rated power of the compressor>maximum power required of the compressor plus any shaft-driven appurtenances for any of thespecified operating conditionsNOTE The rated power includes the effect of equipment such as pulsation suppression devices, process piping, intercoolers and separators. Driver and transmission losses are not included in the rated power of the compressor. Losses incurred in outboard bearings (e.g. as used to support large flywheels) are included.

ISO 13631:2002

rated power (of the compressor)

maximum power the compressor plus any shaft-driven appurtenances require for any of the specified operating

ISO 13707:2000


conditionsNOTE 1 The rated power includes the effect of equipment such as pulsation suppression devices, process piping, intercoolers and separators.NOTE 2 Driver and transmission losses are not included in the rated power of the compressor. Losses incurred in outboard bearings (e.g. as used to support large flywheels) are included.

rated pressure maximum differential pressure, at the rated temperature, to which the side-pocket mandrel is designed to be subjected in normal operation

ISO 17078-1:2004

rated setback load maximum weight of tubular goods which can be supported by the substructure in the setback area

ISO 13626:2003

rated speed100 % speed

highest rotational speed required to meet any of the specified operating conditions

ISO 10437:2003

rated speed speed of the power input rotor corresponding to the requirements of the compressor rated capacityNOTE It is expressed in revolutions per minute.

ISO 10440-1:2000

rated speed speed of the power input rotor corresponding to the requirements of the compressor rated capacityNOTE Rated speed is expressed in revolutions per minute.

ISO 10440-2:2001

rated speed highest speed required to meet any of the specified operating conditions

ISO 13631:2002

rated speed highest speed required to meet any of the specified operating conditions

ISO 13707:2000

rated speed rate of rotation, motion or velocity as specified by the manufacturer

ISO 14693:2003

rated static rotary load maximum weight which can be supported by the rotary-table support beams

ISO 13626:2003

rated temperature maximum design temperature at the factored pressure determined in accordance with ISO 14692-2 and ISO 14692-3

ISO 14692-1:2002

rated temperature maximum temperature, at the rated pressure, to which the mandrel is designed to be subjected in normal operation in a well

ISO 17078-1:2004

rated volume flow inlet volume flow required by the specified operating conditions

ISO 10442:2002

rated working pressure maximum internal pressure that the equipment is designed to contain and/or control NOTE Working pressure is not to be confused with test pressure.

ISO 10423:2003

rated working pressure maximum internal pressure that the equipment is designed to contain and/or control

ISO 13533:2001

rated working pressure maximum internal pressure equipment is designed to contain and/or controlNOTE Working pressure is not to be confused with test pressure.

ISO 13628-4:1999

rated working pressure landing nipple internal pressure design limit or lock mandrel differential pressure design limit from above and/or below, as established by the supplier/manufacturer

ISO 16070:2005

recess enlargement in conduit bore, normally concentric with the bore ISO 13628-3:2000recognized classification societyRCS

member of the international association of classification societies (IACS), with recognized and relevant competence and experience in floating structures, and with established rules and procedures for classification/certification of installations used in petroleum-related activities

ISO 19901-7:2005

record, noun retrievable information ISO 13533:2001records retrievable information ISO 10423:2003redress any activity involving the replacement of qualified parts (3.12)

within the limits described in 5.3.3ISO 10417:2004

redress any activity involving the replacement of qualified parts ISO 10432:2004


cf. repair (3.23)NOTE See Clause 8 for more information.

reduced-opening valve valve with either a regular or Venturi-type opening, either circular or non-circular, through the closure mechanism

ISO 10423:2003

reduced-opening valve valve with the opening through the obturator smaller than at the end connection(s)

ISO 14313:1999

reduced-opening valve valve with the opening through the obturator smaller than at the end connection(s)[ISO 14313:1999]

ISO 14723:2001

reducer component that allows pipes of different sizes to be connected ISO 14692-1:2002redundancy (in an item) existence of more than one means for performing

a required function[IEC 60050-191:1990]

ISO 14224:1999

reel device for storing umbilicals or components comprising two flanges, separated by a barrel, with the barrel axis normally being horizontal

ISO 13628-5:2002

re-entry spool tree upper connection profile, which allows remote connection of a tree running tool, LWRP or tree cap

ISO 13628-4:1999

re-entry spool uppermost part of a subsea tree to which the C/WO riser is attached to gain vertical well access or the uppermost part of a lower workover riser package to which an emergency disconnect package connector is attached to provide a single disconnect point

ISO 13628-7:2005

reference dimension dimension that is a result of two or more other dimensions ISO 10424-1:2004reference electrode electrode whose open circuit potential is constant under

similar conditions of measurement, used to measure the structure-to-electrolyte potential

ISO 15589-1:2003

reference indicator real or artificial discontinuity in a reference standard, which provides reproducible sensitivity levels for inspection equipmentEXAMPLES Artificial reference indicators can be holes, notches, grooves or slots.

ISO 15463:2003

reference period period of time used as basis for determining values of basic variables

ISO 19900:2002

reference standard thread compound that is formulated in accordance with the requirements of annex B, to include the limitations and tolerances in Tables B.1, B.2 and B.3NOTE The reference standard is not intended for general field service.

ISO 13678:2000

reference standard pipe, or pipe section, containing one or more reference indicators, used as a basis for comparison or for inspection equipment standardization

ISO 15463:2003

reinforcement strong material embedded into a matrix to improve its mechanical propertiesNOTE Reinforcements are usually long fibres, whiskers, particulates, etc. The term should not be used synonymously with filler.

ISO 14692-1:2002

reinforcing layer structural layer with a specific lay angle, typically around 55°, which consists of helically wound cables embedded in elastomer, and is used to sustain, totally or partially, tensile loads and internal pressure

ISO 13628-10:2005

relative densityspecific gravity

ratio of the mass of a substance to the mass of an equal volume of a standard substance at a reference temperatureNOTE The standard substance is usually water; the reference temperature is usually 4 °C.

ISO 10426-2:2003

relative densityspecific gravity

property of a liquid expressed as the ratio of the liquid’s density to that of water at 4 °C (39,2 °F)

ISO 13709:2003

relevant indication surface NDE indication with major dimensions greater than 1,6 ISO 10423:2003


mm (1/16 in)NOTE Inherent indications not associated with a surface rupture are considered non-relevant.EXAMPLES Magnetic permeability variations, non-metallic stringers.

relevant indication liquid penetrant or magnetic particle examinationany indication with a major dimension over 1,6 mm (0,062 in)

ISO 13533:2001

relevant indication any indication with a major dimension over 1,6 mm (1/16 in) ISO 13625:2002relevant indication NDT indication that is caused by a condition or type of

discontinuity that requires evaluationISO 15463:2003

reliabilityperformance

ability of an item to perform a required function under given conditions for a given time interval[IEC 60050-191:1990]

ISO 14224:1999

reliability ability of a structure or a structural component to fulfil the specified requirements

ISO 19900:2002

relief valve set pressure pressure at which a relief valve starts to lift ISO 10437:2003remanufacture activity involving disassembly, reassembly and testing of

wellhead and christmas tree equipment, with or without the replacement of parts, where machining, welding, heat treating or other manufacturing operations are employedNOTE Remanufacture does not include the replacement of bodies.

ISO 10423:2003

remanufacture process of disassembly, reassembly and testing of drill-through equipment, with or without the replacement of parts, in which machining, welding, heat treatment or other manufacturing operation is employed

ISO 13533:2001

remanufacture action performed on equipment that involves a special process or re-machining

ISO 13534:2000

remote devicelocated away from the equipment or console, typically in a control room

ISO 10437:2003

remote located away from the equipment or the console, typically in a control house

ISO 10438-1:2003

remote of a control devicelocated away from the equipment or console, typically in a control room

ISO 13710:2004

remote (adj.) applies to any device located away from the equipment or console, typically in a control room

ISO 13707:2000

remote earth that part of the electrolyte in which no measurable voltages, caused by current flow, occur between any two pointsNOTE This condition generally prevails outside the zone of influence of an earth electrode, an earthing system, an impressed-current groundbed or a protected structure.

ISO 15589-1:2003

remotely operated toolROT

dedicated tool that is normally deployed on lift wires or drill stringNOTE Lateral guidance can be by guide wires, dedicated thrusters or ROV assistance.

ISO 13628-8:2002

remotely operated vehicleROV

free-swimming submersible craft used to perform tasks such as valve operations, hydraulic functions and other general tasksNOTE ROVs can also carry tooling packages for undertaking specific tasks such as pull-in and connection of flexible flowlines and umbilicals, and component replacement.

ISO 13628-8:2002

remotely operated vehicleROV

underwater vehicle operated remotely from a surface vessel or installation[ISO 14723]

ISO 15589-2:2004

remote-operated vehicleROV

underwater vehicle operated remotely from a surface vessel or installation

ISO 14723:2001

removal section first section in the surface drilling-fluid system, consisting of a series of compartments to remove gas and undesirable solids

ISO 13501:2005


repair any activity beyond the scope of redress that includes disassembly, re-assembly and testing, with or without the replacement of qualified parts, and may include machining, welding, heat-treating or other manufacturing operations, that restores the equipment to its original performance

ISO 10417:2004

repair activity involving disassembly, reassembly and testing of wellhead and christmas tree equipment with or without the replacement of partsNOTE Repair does not include machining, welding, heat treating, other manufacturing operations or the replacement of bodies.

ISO 10423:2003

repair any activity beyond the scope of redress that includes disassembly, re-assembly, and testing with or without the replacement of parts and may include machining, welding, heat treating or other manufacturing operations, that restores the equipment to its original performancecf. redress (3.22)ISO 10417NOTE See Clause 8 for more information.

ISO 10432:2004

repair process disassembly, reassembly and testing of drill-through equipment, with or without the replacement of partsNOTE Repair does not include machining, welding, heat treating, or other manufacturing operation of component parts and does not include the replacement of pressure-containing part(s) or member(s). Repair may include replacement of parts other than pressure-containing part(s) or member(s).

ISO 13533:2001

repair action performed on equipment that involves replacement of parts, other than expendable parts, but excludes remanufacture

ISO 13534:2000

repair removal of defects from, and refurbishment of, a component or assembly by welding, during the manufacture of new equipmentNOTE The term "repair", as referred to in this International Standard, applies only to the repair of defects in materials during the manufacture of new equipment.

ISO 13535:2000

repair removal of defects from, and refurbishment of, a component or assembly by welding during the manufacturing processNOTE The term “repair”, as referred to in this International Standard, applies only to the repair of defects in materials during the manufacture of new equipment.

ISO 14693:2003

repair level level to which equipment will be repaired or remanufactured in compliance with this International Standard

ISO 10423:2003

repairer/remanufacturer principal agent in the repair and remanufacture of wellhead and christmas tree equipment who chooses to be in compliance with this International Standard

ISO 10423:2003

replacement part part used to repair/remanufacture a piece of equipment that meets the wellhead and christmas tree requirement for the applicable repair/remanufacture level

ISO 10423:2003

repositionable packer [bridge plug]

packer [bridge plug] that meets the definition of retrievable packer [bridge plug] (see 3.31 in original document) and has a design feature facilitating relocation inside the conduit (without removal) while re-establishing its intended function

ISO 14310:2001

representative value value assigned to a basic variable for verification of a limit state

ISO 19900:2002

required capacity capacity specified by the purchaser to meet process conditions, with no negative tolerance (NNT) permitted

ISO 13631:2002

required capacity rated process capacity specified by the purchaser to meet process conditions, with no-negative-tolerance (NNT)

ISO 13707:2000


permittedNOTE See annex B in original document for an explanation of the term no-negative tolerance.

required function function, or combination of functions, of an item which is considered necessary to provide a given service[IEC 60050-191:1990]

ISO 14224:1999

rescue process by which those who have entered the sea directly or in TEMPSC/liferafts are retrieved to a place where medical assistance is available

ISO 13702:1999

rescue process by which those who have entered the sea directly or in survival craft/liferafts are retrieved to a place where medical assistance is available

ISO 15544:2000

residual current part of the total current that is not constituted from harmonic tidal components (i.e. the tidal stream)NOTE Residual currents are caused by a variety of physical mechanisms and comprise a large range of natural frequencies and magnitudes in different parts of the world.

ISO 19901-1:2005

residual fluid content fluid content remaining after testing or commissioning and present during the subsequent loading condition until the start of production

ISO 19901-5:2003

residual stress stress present in a component free of external forces or thermal gradients

ISO 15156-1:2001

residual unbalance level of unbalance remaining in a component or assembly after it has been balanced, either to the limit of the capability of the balancing machine or in accordance with the relevant standard

ISO 10441:1999

residual unbalance level of unbalance remaining in a component or assembly after it has been balanced either to the limit of the capability of the balancing machine or in accordance with the relevant standard

ISO 14691:1999

resilient seal seal or sealing system, which relies on entrapment of a seal ring within a section of the connection (e.g. in the thread-form, on a seal area, etc.) to achieve a seal

ISO 13679:2002

resistance mechanical property of a component, a cross-section, or a member of the structure, e.g. bending resistance, local buckling resistance

ISO 13628-7:2005

resistance capacity of a component, or a cross-section of a component, to withstand action effects without failure

ISO 19900:2002

resistance capacity of a structure, component or a cross-section of a component to withstand action effects without exceeding a limit stateNOTE This definition is at variance with that specified in ISO 19900:2002.

ISO 19901-7:2005

response amplitude operatorRAO

relationship between wave surface elevation amplitude and the vessel response amplitude, and the phase lag between the two

ISO 13628-7:2005

response spectrum plot representing structural response in terms of absolute acceleration, pseudo velocity, or relative displacement values against natural frequency or period

ISO 19901-2:2004

response time sum of the signal time and the shift time ISO 13628-6:2000restoring force force exerted by a centralizer against the casing to keep it

away from the wellbore wallNOTE Restoring force values can vary based on installation methods.

ISO 10427-1:2001

restoring force force exerted by a centralizer against the casing to keep it away from the wellbore wallNOTE Restoring-force values can vary based on the installation methods.

ISO 10427-2:2004


[ISO 10427-1:2001, 3.5]restricted-area sealing meansrestricted-area pack-off

packoff or other device used to isolate an area at higher pressure from one at lower pressureNOTE This device serves to limit pressure-induced loads on connectors or areas of a lower pressure rating. It may also be a seal which encloses a pressure-containment area smaller than the adjacent ring gasket or connector seal.

ISO 10423:2003

retained fluid actual fluid produced by a well or injected into a well ISO 10423:2003retainer valve valve assembly in the C/WO riser used to retain fluid within the

riser and hence preventing its escape to the environment during a riser disconnect operationNOTE Typically located just above the disconnect point.

ISO 13628-7:2005

retort instrument used to distil oil, water and other volatile material in a drilling fluidNOTE The amount of volatile fluid is used to determine oil, water and total solids contents as volume fraction percent, expressed as a percent (see ISO 10414-1 or ISO 10414-2).

ISO 13501:2005

retrievable packer [bridge plug]

packer [bridge plug] that has a design feature facilitating removal from the conduit substantially intact

ISO 14310:2001

return period average period of time between occurrences of a given eventNOTE The inverse of the return period is the statistical probability of such an event occurring in any given year.

ISO 13628-7:2005

return period reciprocal of the probability of exceeding an event during a particular period of timeNOTE The return period is the average time (usually in years) between occurrences of an event exceeding a specified magnitude.

ISO 19900:2002

return period average period between occurrences of an event or of a particular value being exceededNOTE The offshore industry commonly uses a return period measured in years for environmental events. The return period in years is equal to the reciprocal of the annual probability of exceedance of the event.

ISO 19901-1:2005

return period average period between occurrences of an event or of a particular value being exceededNOTE The offshore industry commonly uses a return period measured in years for environmental events. The return period is equal to the reciprocal of the annual probability of exceedance of the event.[ISO 19901-1:2005]

ISO 19901-7:2005

reverse torqueZ

torque applied during tests to simulate loads that might cause the connector to rotate or unscrew, if applicable

ISO 21329:2004

rheology science of the deformation and flow of matter ISO 13503-1:2003right-of-way corridor of land within which the pipeline operator has the right

to conduct activities in accordance with the agreement with the land owner

ISO 13623:2000

rigid centralizer centralizer manufactured with bows that do not flex ISO 10427-1:2001rigid centralizer centralizer manufactured with bows, blades or bars that do not

flexNOTE Adapted from ISO 10427-1:2001, 3.6.

ISO 10427-2:2004

riser that part of an offshore pipeline, including subsea spool pieces, which extends from the sea bed to the pipeline termination point on an offshore installation

ISO 13623:2000

riser vertical portion of a pipeline (including the bottom bend) arriving on or departing from a platform

ISO 13703:2000

riser that part of an offshore pipeline, including any subsea spool pieces, which extends from the seabed to the pipeline termination point on an offshore installation[ISO 13623]

ISO 15589-2:2004


riser tubular used for the transport of fluids between the sea floor and a termination point on the platformNOTE For a fixed structure the termination point is usually the topsides. For floating structures the riser may terminate at other locations of the platform.

ISO 19900:2002

riser piping connecting the process facilities or drilling equipment on the floating structure with the subsea facilities or pipelines, or reservoirNOTE 1 Possible functions include drilling and well intervention, production, injection, subsea systems control and export of produced fluids.NOTE 2 Adapted from ISO 19900:2002, definition 2.29.

ISO 19901-7:2005

riser that part of an offshore pipeline, including subsea spool pieces, which extends from the seabed to the pipeline termination on an offshore installation[ISO 13623:2000]

ISO 21329:2004

riser coupling box female coupling member ISO 13625:2002riser coupling pin male coupling member ISO 13625:2002riser disconnect operation of unlatching a riser connector

EXAMPLE Disconnecting the emergency disconnect package from the lower riser package and/or disconnecting the riser from the subsea test tree.

ISO 13628-7:2005

riser joint section of riser pipe having ends fitted with a box and a pin, typically including integral choke and kill and auxiliary lines

ISO 13625:2002

riser joint joint consisting of a tubular member(s) midsection, with riser connectors at the endsNOTE Riser joints are typically provided in 9,14 m to 15,24 m (30 ft to 50 ft) lengths. Shorter joints, pup joints, can also be provided to ensure proper space-out while running the subsea tree, tubing hanger, or during workover operations.

ISO 13628-7:2005

riser main tube basic pipe from which riser joints are fabricated ISO 13625:2002riser model structural model, established from the tabulated data of the

riser, to describe the actual riser, and used in a global analysis of the riser system

ISO 13628-7:2005

riser pipe seamless pipe which forms the principal conduit of the riser jointEXAMPLE The riser pipe is the conduit for containing the production fluid flow from the well to the surface tree.

ISO 13628-7:2005

riser system comprises the riser and all integrated components including subsea and surface equipmentEXAMPLE In tubing hanger mode, the system includes all components from tubing hanger to the top drive; in tree mode, the system includes all components from the wellhead to the top drive.

ISO 13628-7:2005

risk combination of the chance that a specified undesired event will occur and the severity of the consequences of that event

ISO 13702:1999

risk combination of the chance that a specified hazardous event will occur and the severity of the consequences of the event

ISO 15544:2000

risk combination of the probability of an event and the consequences of the event

ISO 17776:2000

risk analysis use of available information to identify hazards and to estimate risk

ISO 17776:2000

risk assessment overall process of risk analysis and risk evaluation ISO 17776:2000risk evaluation judgement, on the basis of risk analysis, of whether a risk is

tolerableISO 17776:2000

risk of failure probability multiplied by consequence ISO/TR 13881:2000Rockwell C hardnessHRC

hardness value, measured in accordance with ISO 6508, obtained using a diamond cone indenter and a force of 1 471 N

ISO 15156-2:2003


rod boardrod hanger

platform located at a distance above the working floor for supporting rods

ISO 13626:2003

rod reversal change in direction of force in the piston rod loading (tension to compression or vice-versa), which results in a load reversal at the crosshead pin during each revolution

ISO 13631:2002

rod reversal change in direction of force in the piston rod loading (tension to compression or vice versa), which results in a load reversal at the crosshead pin during each revolution

ISO 13707:2000

roll welding welding process in which two pipes are abutted in a horizontal position and rotated while one or more welding passes are deposited between previously prepared bevels on the abutting ends

ISO 13847:2000

room temperature any temperature between 4 °C and 50 °C (40 °F and 120 °F) ISO 10423:2003room temperature any temperature between 4 °C and 40 °C (40 °F and 104 °F),

i.e. temperature corresponding to the test conditions of the material

ISO 13628-7:2005

root bottom of a thread ISO 15463:2003root diameter diameter of the root circle of the internal teeth ISO 10441:1999ROT system dedicated, unmanned, subsea tools used for remote

installation or module replacement tasks that require lift capacity beyond that of free-swimming ROV systemsNOTE The ROT system comprises wire-suspended tools with control system and support-handling system for performing dedicated subsea intervention tasks. They are usually deployed on liftwires or a combined liftwire/umbilical. Lateral guidance may be via guidewires, dedicated thrusters or ROV assistance.

ISO 13628-9:2000

rotary shouldered connection

connection used on drill stem elements, which has coarse, tapered threads and sealing shoulders

ISO 10424-1:2004

rotary table device used to apply torque to the drill string during drilling and normally located in the centre of the drill floorNOTE Can be rotated and can support wear bushing or spider.

ISO 13628-7:2005

rotor complete rotor body and the shaft and shrunk-on sleeves (when furnished)

ISO 10440-1:2000

rotor complete rotor body and the shaft and shrunk-on sleeves (when furnished)

ISO 10440-2:2001

rotor assembly of all the rotating parts of a centrifugal pump ISO 13709:2003rotor pump shaft, whose external surface is in the form of a single

or multiple helix, provided with a connection to attach to the drive string

ISO 15136-1:2001

rotor assembly all rotating elements mounted on the rotor, excluding couplings

ISO 10440-1:2000

rotor assembly rotating elements mounted on the rotor, excluding couplings ISO 10440-2:2001rotor body profile section on or integral with the shaft ISO 10440-1:2000rotor body profile section on or integral with the shaft ISO 10440-2:2001rotor stop device which determines the rotor position during PCP

installationSee Figure D.1. in original document

ISO 15136-1:2001

rough bore flexible pipe with a steel strip carcass as the innermost layer ISO 13628-10:2005rough bore flexible pipe with a carcass as the innermost layer ISO 13628-2:2000rounded indication surface NDE indication which is circular or elliptical, having a

length less than 3 times its widthISO 10423:2003

rounded indication liquid penetrant or magnetic particle examinationany indication that is approximately circular or elliptical and whose length is less than three times its width

ISO 13533:2001

rounded indication indication revealed by NDE, with a circular shape or with an elliptical shape having a length of less than three times the

ISO 13535:2000


widthrounded indication indication that is circular or elliptical with its length less than

three times the widthISO 13625:2002

rounded indication indication, revealed by nondestructive examination, with a circular or elliptical shape and having a length less than three times its width

ISO 14693:2003

rounded indication material inconsistency that is circular or elliptical in shape, such that the length of the material inconsistency is less than three times its width

ISO 17078-1:2004

routine test test performed to provide evidence that the product, process or service or part thereof is in compliance with the relevant requirements of the technical specification

ISO 13880:1999

roving number of strands, tows or ends collected into a parallel bundle with little or no twist

ISO 14692-1:2002

running force maximum force required to move a centralizer through a specified wellbore diameterNOTE Running-force values can vary depending on the installation methods.

ISO 10427-1:2001

running force maximum force required to move a centralizer through a specified wellbore diameterNOTE Running-force values can vary based on the installation methods.[ISO 10427-1:2001]

ISO 10427-2:2004

running liquid fire fire involving a flammable liquid flowing over a surface ISO 13702:1999running tool tool used to run, retrieve, position or connect wellhead

equipment remotely from the drill floorISO 10423:2003

running tool tool used to run, retrieve, position, or connect subsea equipment remotely from the surfaceEXAMPLES Tree running tools, tree cap running tools, flowline connector running tools, etc.

ISO 13628-4:1999

running tool tool used to operate, retrieve, position or connect subsea equipment remotely from the surfaceNOTE An example is the subsea control-module running tool.

ISO 13628-6:2000

running tool specialized tool used to run equipment in a wellEXAMPLE Wireline running tool or various types of tubing-type running tools.

ISO 13628-7:2005

rupture allowable stressσr

allowable stress for the creep-rupture range (see 4.4 in original document)NOTE See 3.2.3 in original document for information about tubes that have longitudinal welds.

ISO 13704:2001

rupture design pressurepr

maximum operating pressure that the coil section will sustain during normal operation

ISO 13704:2001

rupture exponentn

parameter used for design in the creep-rupture rangeSee figures in annexes E and F in original document.

ISO 13704:2001

saddle length of an arc of GRP material adhesively bonded to the outside of the pipe

ISO 14692-1:2002

safe working load the design load minus the dynamic load ISO 13535:2000safe working load design load reduced by the dynamic load ISO 14693:2003safety integrity levelSIL

discrete level for specifying the safety integrity requirements of the safety functions to be allocated to the safety instrumented systemNOTE SIL 4 has the highest level of safety integrity; SIL 1 has the lowest.

ISO 10418:2003

safety systems systems provided on a platform to detect, control and mitigate hazardous situationsNOTE Safety systems include gas detection, emergency shutdown, fire protection, and their control systems.

ISO 19901-2:2004


safety valve landing nipple

any receptacle containing a profile designed for the installation of an SSSV lock mandrelNOTE It may be ported for communication to an outside source for SSSV operation.

ISO 10417:2004

safety valve lock mandrel

retention device used for SSSV equipment ISO 10417:2004

sag point point where the casing deflection is at a maximumNOTE Casing that is supported at two points will tend to sag between the support points, this sag is called the casingsag or casing deflection.

ISO 10427-2:2004

sand trap first compartment and the only unstirred or unagitated compartment in a surface system, and intended as a settling compartment

ISO 13501:2005

scanner detector assembly carrying one or more transducers, used for detecting imperfections and defects in OCTGNOTE The scanner is often equipped with a magnetizer and is a part of it.

ISO 15463:2003

scatter diagram joint probability of two or more (metocean) parametersNOTE A scatter diagram is especially used with wave parameters in the metocean context, see A.5.8. The wave scatter diagram is commonly understood to be the probability of the joint occurrence of the significant wave height (Hs) and a representative period (Tz or Tp).

ISO 19901-1:2005

scour removal of seabed soils caused by currents and wavesNOTE Such erosion can be due to natural processes or can be due to interruption of the natural flow regime near the sea floor by structural elements.

ISO 19900:2002

screen cloth type of screening surface woven in square, rectangular or slotted openings

ISO 13501:2005

screening mechanical process resulting in a division of particles on the basis of size by their acceptance or rejection by a screening surface

ISO 13501:2005

screening criterion target or standard used to judge the tolerability of an identified hazard or effectNOTE See 5.3.2 in original document for further information.

ISO 17776:2000

sea fastening items used for temporary fastening to keep movable items in position during transportation at sea

ISO 19901-5:2003

sea floor interface between the sea and the seabed[ISO 19901-4:2003]

ISO 19901-1:2005

sea floor interface between the sea and the seabed ISO 19901-2:2004sea floor interface between the sea and the seabed ISO 19901-4:2003sea floor slide failure of sea floor slopes ISO 19901-2:2004sea state condition of the sea during a period in which its statistics

remain approximately constantNOTE In a statistical sense the sea state does not change markedly within the period. The period during which this condition exists is usually assumed to be three hours, although it depends on the particular weather situation at any given time.

ISO 19901-1:2005

seabed materials below the sea in which a structure is founded, whether of soils such as sand, silt or clay, cemented material or of rockNOTE The seabed can be considered as the half-space below the sea floor.[ISO 19901-4:2003]

ISO 19901-1:2005

seabed materials below the sea in which a structure is foundedNOTE The seabed can be considered as the half-space below the sea floor.

ISO 19901-2:2004

seabed materials below the sea in which a structure is founded, ISO 19901-4:2003


whether of soils such as sand, silt or clay, cemented materials or of rockNOTE 1 The seabed can be considered as the half-space below the sea floor.NOTE 2 Offshore foundations are most commonly installed in soils, and the terminology in this part of ISO 19901 reflects this. However, the requirements equally apply to cemented seabed materials and rocks. Thus, the term “soil” does not exclude any other material at or below the sea floor.NOTE 3 As yet there are no universally accepted definitions of the various types of soil and rock, see A.6.4.3.

seal barrier to prevent the passage of fluids ISO 13628-7:2005seal barrier resisting the passage of fluids ISO 13678:2000seal barrier to prevent the passage of fluids ISO 13679:2002seal device providing a barrier to the passage of liquid and/or gas ISO 14310:2001seal combination of a mating ring, seal ring, secondary seal(s),

axially flexible element(s) and supporting hardware that allows a rotating shaft to penetrate a stationary housing without incurring uncontrolled leakage

ISO 21049:2004

seal barrier that resists the passage of fluids[ISO 13678:2000]

ISO 21329:2004

seal balance ratio ratio of seal face area exposed to closing force by hydraulic pressure in the seal chamber, to the total seal face areaSee Figure 10.NOTE It is sometimes expressed as a percentage.

ISO 21049:2004

seal barrier gas clean gas supplied to the area between the seals of a dual seal arrangement at a pressure higher than the process pressure

ISO 10438-1:2003

seal buffer gas clean gas supplied to the high pressure side of a seal ISO 10438-1:2003seal chamber component, either integral with or separate from the pump

case (housing), that forms the region between the shaft and casing into which the shaft seal is installed

ISO 21049:2004

seal face side or end of a mating ring or seal ring which provides the sealing surface on the ring

ISO 21049:2004

seal gas leakage gas which flows from the high pressure side of the seal to the low pressure side of the seal

ISO 10438-1:2003

seal line helix formed by the line of contact between rotor and stator ISO 15136-1:2001seal manufacturer agency that designs, manufactures, tests, and provides

service support for seals and associated support sealing systems

ISO 21049:2004

seal ovality maximum seal diameter minus the minimum seal diameter divided by the average seal diameter multiplied by 100NOTE Seal ovality is expressed as a percentage.

ISO 13679:2002

seal ring seal face that contacts the mating ring; it is flexibly mounted using springs or bellows

ISO 21049:2004

sealines all pipelines, flowlines, umbilicals and cables installed on the seabed

ISO 13628-9:2000

sealing bore polished section of conduit that receives a packing element ISO 13628-3:2000sealing device device preventing contact of liquid and/or gas across the

interface between the lock mandrel and the landing nippleISO 10432:2004

sealing device device preventing passage (i.e. communication) of liquid and/or gas across the interface between the lock mandrel and the landing nipple

ISO 16070:2005

seal-welded welded to improve leak tightness of tube-to-tubesheet joints ISO 16812:2002Seamless (S) pipe Tubular product manufactured in a hot forming process which

may be followed by sizing (see 6.5 in original document) or ISO 3183-2:1996


cold finishing (see 3.3.4 in original document) to produce the desired dimensions.

seamless pipe wrought steel tubular product made without a weld seamNOTE It is manufactured by hot-working steel, and if necessary, by subsequently cold-working or heat-treating, or a combination of these operations, to produce the desired shape, dimensions and properties.

ISO 11960:2004

seamless pipe A wrought steel tubular product made without a welded seam, manufactured by hot working steel, and if necessary, by subsequently cold finishing the hot-worked tubular product to produce the desired shape, dimensions, and properties.

ISO 11961:1996

seamless pipe tubular product made without a welded seam, manufactured in a hot-forming process using an extrusion or drawing process that can be followed by cold sizing or cold finishing to produce the desired shape, dimensions and properties

ISO 13628-7:2005

seamless pipe wrought steel tubular product made without a welded seamNOTE Seamless pipe is manufactured by hot-working steel and, if necessary, by subsequently cold finishing the hot-worked tubular product to produce the desired shape, dimensions and properties.

ISO 15463:2003

seamless pipe wrought tubular product made without a welded seam, manufactured by hot working and, if necessary, by subsequent cold finishing of the tubular product to produce the desired shape, dimensions and properties

ISO 15546:2002

seamless pipeS pipe

tubular product manufactured in a hot forming processNOTE The forming process may be followed by cold sizing (see 6.5 in original document) or cold finishing (see 3.3.5 in original document) to produce the desired dimensions.

ISO 3183-3:1999

seamless pipe: Tubular product without a welded seam, manufactured in a hot forming process which may be followed by cold finishing to obtain the desired shape, dimensions and properties.NOTE 2 Cast pipes are not covered by IS0 3183.

ISO 3183-1:1996

seating surface contact surface of the obturator and seat which ensure valve sealingNOTE Adapted from ISO 14313:1999.

ISO 14723:2001

seating surfaces contact surfaces of the obturator and seat which ensure valve sealing

ISO 14313:1999

second end connection connection made at the termination of the pipelaying process ISO 13628-4:1999secondary air air supplied to the fuel to supplement primary air ISO 13705:2001secondary equipment piece of equipment that can normally be isolated from the well

fluid or well pressureISO 10423:2003

secondary load load induced by structural deformation (or the prevention thereof) in the riser which is necessary to satisfy the laws of compatibility of strain and deformationNOTE The internal forces induced by a secondary load diminish when yielding occurs. Secondary loads do not have to be taken into account where they do not affect the resistance of the member/component to resist other loads. Preload of bolts in flanges is an example. During make-up of a flange, the torque/tension applied by the tool on the bolts is primary, but after make-up, the residual bolt preload is secondary.EXAMPLE An example of a secondary load is the bending caused in the C/WO riser during operation within the drilling riser due to flex joint/ball joint angles. Bending moments that exceed yield, in this case, do not generally cause excessive yielding and failure. Other examples are differential temperature in restrained sections and residual stresses after welding.

ISO 13628-7:2005

secondary method <for evacuation> method of leaving the installation which can be carried out in a fully controlled manner under the direction of the person in charge, independent of external support

ISO 13702:1999


secondary method <of evacuation> method of leaving the installation in an emergency which can be carried out in a fully controlled manner under the direction of the person in charge, independent of external support

ISO 15544:2000

secondary seal device, such as an O-ring or flexible graphite gasket, or bellows, that prevents leakage around other seal components

ISO 21049:2004

secondary stress stress developed by constraint due to a geometrical discontinuity, by the use of materials of different elastic moduli under external load, by constraint due to differential thermal expansion, or by assembly load (preload) that does not impair the sealing performance of a connectorNOTE 1 Only stresses that are distributed linearly across the thickness are considered secondary stresses. For non-linearly distributed stresses, the secondary stresses are those of the equivalent linear distribution.NOTE 2 With respect to the mechanical behaviour of the structure, the basic characteristic of secondary stresses is that they lead to plastic deformation when equalizing different local distortions in the case of excess of the yield strength. Characteristic for a secondary stress is that it is self-limiting, i.e. local flow deformation leads to a limitation of the stress.NOTE 3 Secondary stresses can be of the membrane or bending type.NOTE 4 Bending stresses caused by gross structural discontinuities and acting across the wall thickness of the pipe are classified as secondary stresses.

ISO 13628-7:2005

secondary-seal seal gas clean purge gas supplied to the area between the seals of a tandem self-acting gas seal having an intermediate labyrinthNOTE This gas is at a pressure lower than the process pressure.

ISO 10438-1:2003

second-end connection connection made at the termination point of the flowline or umbilical installation process

ISO 13628-1:2005

secure status establishment of two independent barriers between the reservoir and the environment

ISO 13628-7:2005

sedimentation separation and settling of solids in a cement slurry ISO 10426-2:2003seiche oscillation of a body of water at its natural period ISO 19901-1:2005seismic hazard curve curve showing the probability of exceedance against a

measure of seismic intensityNOTE The seismic intensity measures can include parameters such as peak ground acceleration, spectral acceleration, or spectral velocity.

ISO 19901-2:2004

seismic reserve capacity factor

ratio of spectral acceleration which causes structural collapse or catastrophic system failure to the ELE spectral acceleration

ISO 19901-2:2004

seismic risk categorySRC

category defined from the exposure level and the expected intensity of seismic motions

ISO 19901-2:2004

self-acting gas seal module

arrangement of components on a skid or a rack used to support the self-acting gas seal

ISO 10438-1:2003

self-acting gas seal system

self-acting gas seal module and all other components necessary for operation of the self-acting gas seal

ISO 10438-1:2003

self-equalizing feature SCSSV mechanism which, on initiation of opening sequence of the SSSV, permits the well pressure to automatically bypass the SCSSV closure mechanism

ISO 10417:2004

semi-submersible floating structure normally consisting of a deck structure with a number of widely spaced, large cross-section, supporting columns connected to submerged pontoonsNOTE Pontoon/column geometry is usually chosen to minimize global motions in a broad range of wave frequencies.

ISO 19901-7:2005

semi-welded plate pair two adjacent plates welded together where the weld replaces the function of a gasket

ISO 15547-1:2005


NOTE Gaskets are used to seal adjacent semi-welded plate pairs

sensitivity size of the smallest discontinuity detectable by an NDT method with a reasonable signal-to-noise ratio

ISO 15463:2003

sensitivity analysis process of testing the outcome of a life-cycle costing in order to establish whether the final conclusion is sensitive to changes in assumptions

ISO 15663-1:2000

sensitivity analysis process of testing the outcome of a life-cycle costing so as to establish if the final conclusion is sensitive to changes in assumptions

ISO 15663-3:2001

sensor device which automatically detects an operating condition and transmits a signal to initiate/perform a specific control functionNOTE An example of a control function initiated by a sensor is process component shutdown.

ISO 10418:2003

separation gas supply of inert gas or air fed into the region between the seal and the shaft bearing

ISO 10438-1:2003

separation margin margin between a critical speed and the nearest required operating speed

ISO 10437:2003

serialization assignment of a unique code to individual parts and/or pieces of equipment to maintain records

ISO 10423:2003

serialization assignment of a unique code to individual parts and/or pieces of equipment to maintain records

ISO 13533:2001

service condition maximum or minimum temperature or pressure under static or dynamic conditions

ISO 21049:2004

service conditions conditions of use which depend on the design of the pipeline as specified by the purchaser in relationship with the intended applicationNOTE Within this part of ISO 3183, the terms “sour service”, “offshore service” and “low-temperature service” indicate service conditions.

ISO 3183-3:1999

service life period of time during which the flexible pipe fulfils all performance requirements

ISO 13628-10:2005

service life period of time during which the flexible pipe fulfils all performance requirements

ISO 13628-2:2000

service life specified time during which the umbilical system shall be capable of meeting the functional requirements

ISO 13628-5:2002

service life duration of time in which the equipment performs under the specified design conditions, i.e. time in active operation excluding storage periodsNOTE The service life is normally a small fraction of the design life.

ISO 13628-7:2005

serviceability condition of a piece of equipment at any point in time that affects the ability of the equipment to perform its function(s) as intended

ISO 13534:2000

serviceability ability of a structure or structural component to perform adequately for normal functional use

ISO 19901-7:2005

setting heater casing, brickwork, refractory and insulation, including the tiebacks

ISO 13705:2001

settlement permanent downward movement of a structure as a result of its own weight and other actions

ISO 19901-4:2003

settling out pressure pressure of the compressor system when the compressor is shut down

ISO 10439:2002

settling-out pressure maximum pressure the system can reach under static conditions

ISO 10438-1:2003

severe galling galling that cannot be repaired by the use of fine files and abrasive paper

ISO 13679:2002


severity class effect on equipment unit function ISO 14224:1999shaft part of a check valve that connects the obturator to the

operator and which may consist of one or more componentsISO 14723:2001

shaft-driven pump oil pump driven by the shaft of one of the main machines served by the oil system

ISO 10438-1:2003

shaft-mounted assembly

total assembly of parts rigidly connected to the shaft of the driving or driven machineNOTE This includes the hub, where supplied, and all other components up to the flexible element(s) of a metallic or elastomeric flexible-element coupling or one of the pair of contacting parts in a mechanical contact type coupling.

ISO 10441:1999

shaft-mounted assembly

total assembly of parts rigidly connected to the shaft of the driving or driven machine, including the hub, where supplied, and all other components up to the flexible-element(s) of a metallic or elastomeric flexible-element coupling or one of the pair of contacting parts in a mechanical contact type coupling

ISO 14691:1999

shale shaker mechanical device that separates cuttings and large solids from a drilling fluidNOTE The separation methods can include vibrating screens, rotating cylindrical screens, etc.

ISO 13501:2005

shall is used to indicate that a provision is mandatory ISO 10405:2000shear device component designed to disconnect under a predetermined

loadISO 14310:2001

shear history sequence of shear rates and temperatures applied to fluids prior to and during measurements

ISO 13503-1:2003

shear rate rate at which one particle of fluid is sliding by another particle divided by the distance between those particles

ISO 13503-1:2003

shear stress force required to sustain fluid flow ISO 13503-1:2003shear-history simulator apparatus used to simulate shear history in a fluid ISO 13503-1:2003shearing valve gate valve or ball valve designed to shear wireline or coiled

tubing and that can seal the boreISO 13628-7:2005

shield sectionshock section

tubes that shield the remaining convection-section tubes from direct radiation

ISO 13705:2001

shift time period of time elapsed between the arrival of a control signal at the subsea location and the completion of the control function executionNOTE Of primary interest is the time to fully stroke, on a subsea tree, a master or wing valve that has been designated as the underwater safety valve.

ISO 13628-6:2000

ship-shaped structure monohull floating structure having a geometry similar to that of ocean-going ships

ISO 19901-7:2005

short-term distribution probability distribution of a variable within a short interval of time during which conditions are assumed to be statistically constantNOTE The interval chosen is most often the duration of a sea state.

ISO 19901-1:2005

short-term hydrostatic pressureSTHP

short-term burst pressure determined with free ends at SLT (2.2.116)NOTE STHP is determined in accordance with ASTM D1599.

ISO 14692-1:2002

shot peening inducing compressive stresses in the surface layer of a material by bombarding it with a selected medium (usually round steel shot) under controlled conditions

ISO 15156-2:2003

should is used to indicate that a provision is not mandatory, but recommended as good practice

ISO 10405:2000

shroud removable covering for the top and sides of the plate pack of the plate-and-frame heat exchanger, which provides protection in the event of a spray leak or fire

ISO 15547-1:2005

shutdown condition preset value of a parameter requiring automatic or manual ISO 10439:2002


shutdown of the systemshutdown point preset value of a parameter at which automatic or manual

shutdown of the system is requiredISO 10438-1:2003

shut-down point preset value of a parameter at which automatic or manual shut-down of the system is required

ISO 13707:2000

shutdown set point preset value of a measured parameter at which automatic or manual shutdown of the system or equipment is required

ISO 10437:2003

shutdown set point pre-set value of a measured parameter at which automatic or manual shutdown of the system or equipment is required

ISO 13710:2004

shutdown valveSDV

automatically operated, fail-closed valve used for isolating a pipeline or process station

ISO 10418:2003

shutdown valve automatically-operated valve used for isolating a process component or process system

ISO 13703:2000

shut-in tubing pressureSITP

maximum pressure that the wellhead could be subjected to as a result of a long-term shut-off of the well

ISO 10418:2003

side-pocket mandrel tubing-mounted device that accepts a flow-control or other device in a bore that is offset from and essentially parallel with the through-bore of the tubing productNOTE This parallel bore includes sealing surfaces and latching profiles.

ISO 17078-1:2004

sieve laboratory screen with wire-mesh or electronically-punched holes of known dimensions

ISO 13501:2005

sieve analysis classification by mass of solid particles passing through or retained on a sequence of screens with decreasing aperture sizesNOTE Sieve analysis can be carried out by wet or dry methods.

ISO 13501:2005

signal response of electronic NDT equipment to an imperfection or defect

ISO 15463:2003

signal time period of time elapsed between the remote initiation of a control command and the initiation of a control function operation subsea

ISO 13628-6:2000

signal-to-noise ratio ratio of the signal from a significant imperfection or defect to signals generated from surface noise

ISO 15463:2003

significant value statistical measure of the peak responsesNOTE In most offshore applications the significant value is taken as 2s, where s is the standard deviation of the time series of the zero-mean random variable over the duration of the measurement.

ISO 19901-7:2005

significant wave height statistical measure of the height of waves in a sea stateNOTE The significant wave height was originally defined as the mean height of the highest one-third of the zero up-crossing waves in a sea state. In most offshore data acquisition systems the significant wave height is currently taken as (where m0 is the zeroth spectral moment, see 3.31) or 4, where is the standard deviation of the time series of water surface elevation over the duration of the measurement, typically a period of approximately 30 min.

ISO 19901-1:2005

single point mooring mooring system that allows the floating structure to which it is connected to vary its heading (weathervane)EXAMPLE One example of a single point mooring is a turret mooring system where a number of mooring lines are attached to a turret, which includes bearings to allow the structure to rotate.

ISO 19901-7:2005

single seal one barrier or multiple barriers that cannot be physically differentiated in their function

ISO 13679:2002

single-engagement coupling

coupling with only one plane of flexureNOTE Single-engagement couplings of some types, notably gear and metallic flexible-element types, will not normally accommodate parallel (or lateral) offset.

ISO 10441:1999

single-engagement coupling with only one plane of flexure ISO 14691:1999


coupling NOTE Single-engagement couplings of some types, notably gear and metallic flexible-element types, will not normally accommodate parallel (or lateral) offset misalignment.

site location where piping system is installed ISO 14692-1:2002site response analysis wave propagation analysis permitting the evaluation of the

effect of local geological and soil conditions on the design ground motions at a given siteNOTE The site response analysis results can include amplitude, frequency content and duration.

ISO 19901-2:2004

size relevant dimensional characteristics of the equipment as defined by the manufacturer

ISO 10432:2004

size relevant dimensional characteristics of the equipment as defined by the supplier/manufacturer

ISO 16070:2005

size class designation by which dimensionally-interchangeable equipment of the same maximum load rating is identified

ISO 13535:2000

size class designation of the dimensional interchangeability of equipment specified herein

ISO 14693:2003

size range range of tubular diameters to which an assembly is applicable ISO 14693:2003sizing agent coating on glass fibres used to promote bonding of glass-

reinforcement to resinISO 14692-1:2002

skelp hot-rolled steel strip used for manufacturing EW pipe ISO 11960:2004skid system storage, transportation, lifting and testing frames to facilitate

movement of the ROT systems and the modules and components to be replaced or installedNOTE Skids are used in combination with a skidding system.

ISO 13628-9:2000

slick joint special riser joint designed to prevent damage to the riser and control umbilical where they pass through the rotary tableNOTE Usually included in C/WO risers and is sometimes named “cased wear joint”.

ISO 13628-7:2005

slippage fluid leakage occurring across the dynamic seal lines between the cavities

ISO 15136-1:2001

slippage force range range of forces required to continue to move a stop collar after the holding force has been overcome

ISO 10427-2:2004

slip-type casing hanger mechanism used to support a casing string in a casing head by gripping the pipe with wedge-type members

ISO 10423:2003

slow roll speed recommended by the vendor (typically 400 r/min to 500 r/min) for warm-up and initial check of equipment integrity prior to full operation

ISO 10437:2003

slug tank small compartment, normally adjacent to the suction compartment, used to mix special fluids to pump downholeNOTE Slug tanks are most commonly used to prepare a small volume of weighted drilling fluid before a drillstem trip in and out of the borehole.

ISO 13501:2005

slurry container container in a pressurized consistometer used to hold the slurry for conditioning purposes or for thickening-time test

ISO 10426-2:2003

slurry containerslurry cup

container in a pressurized consistometer used to hold the slurry for conditioning purposes or for the thickening time test

ISO 10426-1:2005

smooth bore flexible pipe with an elastomer layer as the innermost layer ISO 13628-10:2005smooth bore flexible pipe with an internal pressure sheath as the innermost

layerISO 13628-2:2000

S-N curve graphical presentation of the dependence of fatigue life, N, on fatigue strength, SNOTE It is also known as the Wöhler curve.

ISO 13628-7:2005

S-N curves curves showing stress range versus number of cycles ISO 13628-2:2000S-N data data obtained by plotting cyclic stress level versus

number of cycles to failureISO 13628-5:2002

soft zone cracking form of SSC that may occur when a steel contains a local “soft ISO 15156-1:2001


SZC zone” of low yield strength materialNOTE Under service loads, soft zones may yield and accumulate plastic strain locally, increasing the SSC susceptibility to cracking of an otherwise SSC-resistant material. Such soft zones are typically associated with welds in carbon steels.

solid centralizer centralizer manufactured in such a manner as to be a solid device with nonflexible fins or bandsNOTE These centralizers have solid bodies and solid blades.

ISO 10427-2:2004

solid solution single crystalline phase containing two or more elements ISO 15156-3:2003solution annealing heating to a suitable temperature, holding at that temperature

long enough to cause one or more constituents to enter into solid solution, then cooling rapidly enough to hold such constituents in solution[ISO 4885]

ISO 13680:2000

sonic strength extent of strength development of a cement sample calculated by measuring the velocity of sound through itNOTE The calculation is based on specific mathematical correlations and not on direct measurements of strength.

ISO 10426-2:2003

sootblower device used to remove soot or other deposits from heat-absorbing surfaces in the convection sectionNOTE Steam is normally the medium used for soot blowing.

ISO 13705:2001

sour service exposure to oilfield environments that contain H2S and can cause cracking of materials by the mechanisms addressed in ISO 15156NOTE Adapted from ISO 15156-1:2001.

ISO 10432:2004

sour service service conditions with a H2S content exceeding the minimum specified by ISO 15156 at the design pressureNOTE For the purposes of this provision, NACE MR0175 is equivalent to ISO 15156.

ISO 13628-10:2005

sour service service conditions with an H2S content exceeding the minimum specified by ANSI/NACE MR0175 at the design pressure

ISO 13628-2:2000

sour service service conditions with H2S content exceeding the minimum specified by ISO 15156 (all parts) at the design pressure

ISO 13628-7:2005

sour service exposure to oilfield environments that contain H2S and can cause cracking of materials by the mechanisms addressed by this part of ISO 15156

ISO 15156-1:2001

source origin of radiation, which is an x-ray tube or radioisotope ISO 15463:2003source of release point from which flammable gas, liquid or a combination of

both can be released into the atmosphereISO 13702:1999

spacer pressure-containing piece of equipment used to connect and provide separation between other pieces of equipment

ISO 10423:2003

spacer fluid containing insoluble weighting materials that is used to separate drilling fluids and cementing slurries

ISO 10426-2:2003

spacer that part of a coupling that is removable to provide space and give access for the use of tools to remove the coupling hubs or for other purposesNOTE The spacer may be a single component or an assembly.

ISO 10441:1999

spacer part of a coupling that is removable to provide space and give access for the use of tools to remove the coupling hubs or for other purposesNOTE The spacer may be a single component or an assembly.

ISO 14691:1999

spacer gap length axial length of the free gap, after the removal of the spacer, that is available for the use of tools to remove the hubs or for other purposesNOTE Spacer gap length may be less than the distance between the shaft ends.

ISO 10441:1999

spacer gap length axial length of the free gap, after the removal of the spacer ISO 14691:1999


assembly, that is available for the use of tools to remove the hubs or for other purposesNOTE The spacer gap length may be less than the distance between the shaft ends.

spar platform deep-draught, small water-plane area floating structure ISO 19901-7:2005special end-finish threads with thread form and features, manufacturing

specifications, dimensions, connection make-up and performance properties which are beyond the scope of this International Standard

ISO 11960:2004

special feature specific component or sub-assembly that provides a functional capability that is not validated during the validation test conducted in accordance with 6.5

ISO 10432:2004

special process operation which converts or affects material properties ISO 13533:2001special process operation that can change or affect the mechanical properties,

including toughness, of the materials used in equipmentISO 13534:2000

special process operation which may change or affect the mechanical properties, including toughness, of the materials used in the equipment

ISO 13535:2000

special process operation that may change or affect the mechanical properties, including toughness, of the materials used in the equipment

ISO 14693:2003

special process process where the conformity of the resulting product cannot be readily or economically verified by subsequent monitoring or measurement

ISO/TS 29001:2003

special processes Final operations which are performed during pipe manufacturing that affect product attributes, except chemistry and dimensions.NOTE 1 The special processes are heat treatment and, if applicable, cold finishing.

ISO 11961:1996

special tool tool which is not a commercially available catalogue item ISO 10437:2003special tool tool that is not commercially available, e.g. from a catalogue ISO 13710:2004special-purpose application

application for which the equipment is designed for uninterrupted, continuous operation in critical service and for which there is usually no spare equipment

ISO 10438-1:2003

special-purpose application

application for which the equipment is designed for uninterrupted, continuous operation in critical service and for which there is usually no spare equipment

ISO 13691:2001

special-purpose turbines

horizontal turbines used to drive equipment that are usually not spared and are used in uninterrupted continuous operation in critical serviceNOTE This category is not limited by steam conditions, power or turbine speed.

ISO 10437:2003

special-service side-pocket mandrel

side-pocket mandrel designed for special operations including chemical injection, CO2 injection, hydraulic control, electrical control, or other applications where a secondary conduit terminates at the side-pocket mandrel

ISO 17078-1:2004

specific speed index relating flow, total head and rotational speed for pumps of similar geometrySee Annex A.

ISO 13709:2003

specified material material meeting a particular performance requirement(s) as specified by a manufacturer or industry standard

ISO 10423:2003

specified minimum yield strengthSMYS

minimum yield strength required by the specification or standard under which the material is purchased

ISO 13623:2000

specified minimum yield strength

minimum yield strength at room temperature prescribed by the specification or standard under which the material is purchased

ISO 13628-7:2005


specified minimum yield strength

minimum yield strength required by the specification or standard under which the material is purchased[ISO 13623:2000]

ISO 21329:2004

specimen connection between two pieces of pipeNOTE The specimen can be composed of one coupling and two pins for coupled connections, or one pin and one box for integral connections.

ISO 13679:2002

spectral acceleration maximum absolute acceleration response of a single degree of freedom oscillator subjected to ground motions due to an earthquake

ISO 19901-2:2004

spectral density functionenergy density functionspectrum

measure of the variance associated with a time-varying variable per unit frequency band and per unit directional sectorNOTE 1 Spectrum is a shorthand expression for the full and formal name of spectral density function or energy density function.NOTE 2 The spectral density function is the variance (the mean square) of the time-varying variable concerned in each frequency band and directional sector. Therefore the spectrum is in general written with two arguments: one for the frequency variable and one for a direction variable.NOTE 3 Within this document the concept of a spectrum applies to waves, wind turbulence and action effects (responses) that are caused by waves or wind turbulence. For waves, the spectrum is a measure of the energy traversing a given space.

ISO 19901-1:2005

spectral displacement maximum relative displacement response of a single degree of freedom oscillator subjected to ground motions due to an earthquake

ISO 19901-2:2004

spectral frequency distribution

description of the pressure pulsation harmonic amplitudes versus frequency at a selected test point location for an active or passive acoustic analysis (see 3.1 in original document)

ISO 13707:2000

spectral momentnth spectral moment

integral over frequency of the spectral density function multiplied by the nth power of the frequency, either expressed in hertz (cycles per second) as

or expressed in circular frequency (radians/second) as NOTE 1 As = 2 f, the relationship between the two moment expressions is: mn( ) = (2)n mn(f).NOTE 2 The integration extends over the entire frequency range from zero to infinity. In practice the integration is often truncated at a frequency beyond which the contribution to the integral is negligible and/or the sensor no longer responds accurately.

ISO 19901-1:2005

spectral peak period period of the maximum (peak) energy density in the spectrumNOTE In practice there is often more than one peak in a spectrum.

ISO 19901-1:2005

spectral velocity maximum pseudo velocity response of a single degree of freedom oscillator subjected to ground motions due to an earthquake

ISO 19901-2:2004

speed power pumpnumber of revolutions of the crankshaft in a given unit of time.NOTE It is expressed in revolutions per minute.

ISO 13710:2004

speed direct-acting pumpnumber of strokes of the piston in a given unit of time.NOTE It is expressed in strokes per minute.

ISO 13710:2004

spider device having retractable jaws or dogs used to support the riser on the uppermost connector support shoulder during running of the riserNOTE The handling spider sits either on the rotary bushing or in the rotary table. It provides a hang-off point for the integral C/WO riser. Some spiders will lock to the rotary via the kelly drive pinholes in the master bushing. With the pins engaged, the spider can resist

ISO 13628-7:2005


torque. For non-integral risers, tubing slips and false rotaries are used in lieu of the spider.

splash zone part of the riser subjected to repeated wetting and drying by seawater

ISO 13628-7:2005

splash zone area of a structure that is frequently wetted due to waves and tidal variations

ISO 19900:2002

splice, verb join together component lengths or sub-components to achieve the required production length

ISO 13628-5:2002

split gate valve valve where the gate is made of two or more pieces which are capable of being energized to seal both upstream and downstream at the same time

ISO 13628-4:1999

spool short segment of rigid pipe with a connector half at either endNOTE A spool is commonly used to connect flowlines and/or subsea facilities together, e.g. a subsea tree to a subsea manifold.

ISO 13628-1:2005

spoolpiece permanent assembly of pipe and fittings fabricated in the factory using laminated or adhesive joints

ISO 14692-1:2002

spread mooring mooring system consisting of multiple mooring lines terminated at different locations on a floating structure, and extending outwards, providing an almost constant structure heading

ISO 19901-7:2005

spurt loss volume of fluid that passes through the filtration medium before a filter cake is formed

ISO 10416:2002

squall strong wind event characterized by a sudden onset, a duration of the order of minutes and a rather sudden decrease in speedNOTE 1 A squall is often accompanied by a change in wind direction, a drop in air temperature and by heavy precipitation.NOTE 2 To be classed as a squall the wind speed would typically be greater than about 8 m/s and last for longer than 2 min (thereby distinguishing it from a gust).

ISO 19901-1:2005

squeeze-cementing remedial process in which cementing material is forced under pressure into a specific portion of the well such as a fracture or opening

ISO 10426-2:2003

SSSV system equipment

components which include the surface-control system (3.2.4), control line (3.1), SSSV (3.23), safety valve lock (3.17), safety valve landing nipple (3.16), flow couplings and other downhole control components

ISO 10417:2004

SSV actuatorunderwater safety valve actuatorUSV actuator

device which causes the SSV/USV valve to open when power is supplied and to close automatically when power is lost or released

ISO 10423:2003

SSV valveUSV valve

portion of the SSV/USV which contains the wellstream and shuts off flow when closed

ISO 10423:2003

stab mating box and pin assembly that provides pressure-tight engagement of two pipe jointsNOTE An external mechanism is normally used to keep the box and pin engaged. For example, riser joint annulus stabs can be retained in the stab mode by the make-up of the riser coupling.

ISO 13628-7:2005

stab sub male half of sealing mechanism between component interfacesNOTE Stab subs can use elastomeric or metal seals or both.

ISO 13628-7:2005

stability difference in inlet volume flow (as percentage of rated inlet volume flow) between the rated inlet volume flow and the surge point at rated speed

ISO 10439:2002

stabilized pressure testingin a state in which the initial pressure-decline rate has decreased to within the manufacturer'sspecified rateNOTE Pressure decline can be caused by such things as changes in

ISO 13533:2001


temperature, setting of elastomer seals or compression of air trapped in the equipment being tested.

stabilized temperature testingin a state in which the initial temperature fluctuations have decreased to within the manufacturer's specified rangeNOTE Temperature fluctuation can be caused by such things as mixing of different-temperature fluids, convection or conduction.

ISO 13533:2001

stack vertical conduit used to discharge flue gas to the atmosphere ISO 13705:2001stainless steel steel containing more than 11 % chromium (mass fraction) to

render the steel corrosion-resistantNOTE Other elements may be added to secure special properties.

ISO 10423:2003

stainless steel steel containing 10,5 % or more chromium, possibly with other elements added to secure special properties

ISO 15156-3:2003

standard connection flange, hub or studded connection manufactured in accordance with an ISO standard, including dimensional requirements

ISO 13533:2001

standard flow flowrate at an absolute pressure of 0,101 3 MPa (1,013 bar) and a temperature of 0 °CNOTE It is expressed in units of volume flow.

ISO 13631:2002

standard flow flow rate expressed in volume flow units at ISO standard conditions which are an absolute pressure of 1,013 bar and a temperature of 0 °C

ISO 13707:2000

standard laboratory temperatureSLT

temperature as defined by a recognized standard with standard toleranceEXAMPLE 23 °C 2 °C.

ISO 14692-1:2002

standard service packer or bridge plug whose components may or may not be manufactured from materials that comply with NACE MR0175

ISO 14310:2001

standardization the adjustment of an NDT instrument using an appropriate reference standard, to obtain or establish a known and reproducible response

ISO 15463:2003

standardization check check of the standardization adjustments to ensure that they remain correct

ISO 15463:2003

standby pump oil pump that is normally either stopped or running at idling speed, that is capable of either automatically or manually being immediately brought up to operating speed, and that is capable of operating continuously

ISO 10438-1:2003

standby service normally idle, or idling, piece of equipment that is capable of immediate automatic or manual startup and continuous operation

ISO 10437:2003

standby service normally idle or idling piece of equipment that is capable of immediate automatic or manual start-up and continuous operation

ISO 10438-1:2003

standby service service condition in which a normally idle or idling piece of equipment is capable of immediate automatic or manual start-up and continuous operation

ISO 10442:2002

standby service normally idle or idling piece of equipment that is capable of immediate automatic or manual start-up and continuous operation

ISO 13709:2003

standoff smallest distance between the outside diameter of the casing and the wellbore

ISO 10427-1:2001

standoff smallest distance between the outside diameter of the casing and the wellbore[ISO 10427-1:2001, 3.8]

ISO 10427-2:2004

standoff ratio ratio of standoff to annular clearanceNOTE It is expressed as a percentage.

ISO 10427-1:2001

standoff ratio ratio of standoff to annular clearance for perfectly centred ISO 10427-2:2004


Rs casingNOTE 1 It is expressed as a percentage.NOTE 2 Adapted from ISO 10427-1:2001, 3.9.

starting force maximum force required to insert a centralizer into a specified wellbore diameterNOTE Starting-force values can vary depending on the installation methods.

ISO 10427-1:2001

starting force maximum force required to insert a centralizer into a specified wellbore diameterNOTE Starting-force values can vary based on the installation methods.[ISO 10427-1:2001, 3.10]

ISO 10427-2:2004

starting pressurepS

initial pressure applied to the test sample at the beginning of the thickening-time testNOTE pS is also used to determine the pressure-up rate.

ISO 10426-2:2003

static application flexible pipes not exposed to significant cyclically varying loads or deflections during normal operations

ISO 13628-10:2005

static application application in which the flexible pipes are not exposed to significant cyclically varying loads or deflections during normal operations

ISO 13628-2:2000

static fluid loss test test to determine fluid lost from a cement slurry when placed against a 325 mesh screen at 6 900 kPa (1 000 psi) differential pressure

ISO 10426-2:2003

static level stabilized fluid level under standard conditions of temperature and pressure when the PCP is at a stopped positionNOTE Standard conditions, unless otherwise indicated, are 15 °C and 0,101 3 MPa.

ISO 15136-1:2001

static pushover methodstatic pushover analysis

application and incremental increase of a global static pattern of actions on a structure, including equivalent dynamic inertial actions, until a global failure mechanism occurs

ISO 19901-2:2004

static seal seal in which no motion exists relative to sealing surfaces after installation

ISO 10423:2003

static sealing-pressure rating

highest pressure that the seal can continuously withstand at the maximum allowable temperature while theshaft is not rotatingNOTE Thereafter, the seal maintains its dynamic sealing pressure rating.

ISO 21049:2004

static stability test test to determine the degree of sedimentation and free fluid development in a cement slurry

ISO 10426-2:2003

stationkeeping system system capable of limiting the excursions of a floating structure within prescribed limits

ISO 19901-7:2005

stator housing and a lining (typically elastomeric) in the form of a double or multiple internal helix, which always has one more helix than the rotor, with a connection to the production tubing

ISO 15136-1:2001

steam rate quantity of steam required by the turbine per unit of power output measured at the output shaft of the turbine

ISO 10437:2003

stem part that connects the obturator to the operator and which may consist of one or more components

ISO 14313:1999

stem part that connects the obturator to the operator and which may consist of one or more components[ISO 14313:1999]

ISO 14723:2001

stem extension assembly

assembly consisting of the stem extension and the stem extension housing

ISO 14313:1999

stepwise crackingSWC

cracking that connects hydrogen-induced cracks on adjacent planes in a steelNOTE This term describes the crack appearance. The linking of hydrogen-induced cracks to produce stepwise cracking is dependent

ISO 15156-1:2001


upon local strain between the cracks and embrittlement of the surrounding steel by dissolved hydrogen. HIC/SWC is usually associated with low-strength plate steels used in the production of pipes and vessels.

still water level abstract water level typically used for the calculation of wave kinematics for global actions and wave crest elevation for minimum deck elevationsNOTE Still water level is an engineering abstract calculated by adding the effects of tides and storm surge to the water depth but excluding variations due to waves (see Figure 1). It can be above or below mean sea level.

ISO 19901-1:2005

stilling tube pipe extending into the reservoir from the connection to below pump suction loss level to prevent splashing and provide free release of foam and gasNOTE A stilling tube is typically used for non-pressurized returns, and has an open top or vent holes to equalize to reservoir pressure.

ISO 10438-1:2003

stirred fluid-loss cell cell specially designed to allow for conditioning of the cement slurry within the same cell used to perform a static fluid loss test

ISO 10426-2:2003

stop collar device attached to the casing to prevent movement of a casing centralizerNOTE A stop collar can be either an independent piece of equipment or integral with the centralizer.

ISO 10427-1:2001

stop collar device attached to the casing to prevent movement of a casing centralizerNOTE A stop collar can be either an independent piece of equipment or integral with the centralizer.[ISO 10427-1:2001, 3.11]

ISO 10427-2:2004

storage act of retaining SSSV system equipment without damage or contamination, after processing is completed and prior to or after field use, including the transport process

ISO 10417:2004

storage compound substance that is applied to threaded oilfield pipe connections to protect against corrosion during either shipment or storage or bothNOTE Compounds that are for storage only should not be used for connection make-up.

ISO 13678:2000

storm surge change in sea level (either positive or negative) that is due to meteorological (rather than tidal) forcing

ISO 19901-1:2005

straightness degree to which the longitudinal axis of a length of OCTG is parallel to a straight line

ISO 15463:2003

strakespoiler

metal attachment to a stack which can prevent the formation of von Karman vortices that can cause wind-induced vibration

ISO 13705:2001

stray current current in the path other than the protective current under consideration

ISO 15589-1:2003

strength mechanical property of a material, usually given in units of stress

ISO 13628-7:2005

strength retrogression reduction in compressive strength and increase in permeability of a cement caused by exposure to temperatures exceeding 110 °C (230 °F)

ISO 10426-2:2003

strength-welded welded so that the design strength is equal to, or greater than, the maximum allowable axial tube strength of tube-to-tubesheet joints

ISO 16812:2002

stress amplification factorSAF

KSAFfactor equal to the local peak alternating stress in a component (including welds) divided by the nominal alternating stress in the pipe wall at the location of the componentNOTE This factor is used to account for the increase in the stresses

ISO 13625:2002


caused by geometric stress amplifiers which occur in riser components.

stress concentration factorSCF

local peak alternating stress in a component (including welds) divided by the nominal alternating stress in the pipe wall at the location of the componentNOTE This factor is used to account for the increase in the stresses caused by geometric stress amplifiers, which occur in the riser component.

ISO 13628-7:2005

stress corrosion crackingSCC

cracking of metal involving anodic processes of localized corrosion and tensile stress (residual and/or applied) in the presence of water and H2SNOTE Chlorides and/or oxidants and elevated temperature can increase the susceptibility of metals to this mechanism of attack.[ISO 15156-1]

ISO 10432:2004

stress corrosion crackingSCC

cracking of metal involving anodic processes of localized corrosion and tensile stress (residual and/or applied) in the presence of water and H2SNOTE Chlorides and/or oxidants and elevated temperature can increase the susceptibility of metals to this mechanism of attack.

ISO 15156-1:2001

stress cracking stress corrosion cracking, or sulfide stress cracking, or bothNOTE Adapted from NACE MR0175: Jan 2003.

ISO 10432:2004

stress intensification factorSIF

ratio of the actual/effective stress in a component/fitting under external load to the nominal stress in that component/fitting as determined based on a straight pipe run with the same section modulus and Young's modulus

ISO 14692-1:2002

stress intensity factor fracture mechanics factor used to define the local conditions of stress and strain around a crack tip in terms of global parameters such as of loads, geometry and crack size

ISO 13628-7:2005

stress joint specialized riser joint designed with a tapered cross-section, in order to control curvature and reduce local bending stressesNOTE It is the lowermost riser joint in the riser string when configured for workover.

ISO 13628-7:2005

stress range difference between stress maximum and stress minimum in a stress cycle

ISO 13628-7:2005

stress relief controlled heating of material to a predetermined temperature for the purpose of reducing any residual stresses after welding

ISO 10423:2003

stress relief controlled heating of material to a predetermined temperature for the purpose of reducing any residual stresses

ISO 10432:2004

stress relief controlled heating of material to a predetermined temperature for the purpose of reducing any residual stresses

ISO 13533:2001

stress relieving heating a metal to a suitable temperature, holding at that temperature long enough to reduce residual stresses, and then cooling slowly enough to minimize the development of new residual stresses

ISO 15156-2:2003

stress thicknessσ

thickness, excluding all thickness allowances, calculated from an equation that uses an allowable stress

ISO 13704:2001

stress-corrosion cracking

cracking which results from a combination of corrosion and stress

ISO 10423:2003

stress-oriented hydrogen-induced crackingSOHIC

staggered small cracks formed approximately perpendicular to the principal stress (residual or applied) resulting in a “ladder-like” crack array linking (sometimes small) pre-existing HIC cracksNOTE The mode of cracking can be categorized as SSC caused by a combination of external stress and the local strain around hydrogen-induced cracks. SOHIC is related to SSC and HIC/SWC. It has been observed in parent material of longitudinally welded pipe and in the heat-affected zone (HAZ) of welds in pressure vessels. SOHIC is a relatively uncommon phenomenon usually associated with low-

ISO 15156-1:2001


strength ferritic pipe and pressure vessel steels.stress-relief features modification performed on rotary shouldered connections by

removing the unengaged threads on the pin or box to make the joint more flexible and to reduce the likelihood of fatigue-cracking in highly stressed areas

ISO 10424-1:2004

strip [plate] end weld weld that joins strip [plate] ends together ISO 3183-3:1999Strip end weld A weld that joins strip (skelp) ends together. ISO 3183-2:1996strip/skelp end weld: Seam weld that joins plate or strip ends together. ISO 3183-1:1996stroke total upward and downward vertical movements of the riser

relative to the vessel, i.e. travel of the riser tensioner, draw works and slick jointNOTE It includes effects from environmental loads, functional loads (i.e. top tension, temperature and mean static vessel offset) and pressure.

ISO 13628-7:2005

structural code recognized structural standard specified or agreed by the purchaserEXAMPLES AISC M011 and AISC S302.

ISO 13706:2005

structural component physically distinguishable part of a structureEXAMPLE Column, beam, stiffened plate, tubular joint, or foundation pile.

ISO 19900:2002

structural component physically distinguishable part of a structure[ISO 19900:2002]

ISO 19901-7:2005

structural design code structural design standard specified or agreed by the purchaserEXAMPLES ICBO Uniform Building Code, ASCE standards, AISC Specification for design, fabrication and erection of structural steel for buildings.

ISO 13705:2001

structural model idealization of the structural system used for design or assessment

ISO 19900:2002

structural system load-bearing components of a structure and the way in which these components function together

ISO 19900:2002

structural welding code recognized structural welding code specified or agreed by the purchaser

ISO 15547-1:2005

structural welding code recognized structural welding code specified or agreed by the purchaser

ISO 15547-2:2005

structure organized combination of connected parts designed to withstand actions and provide adequate rigidity

ISO 19900:2002

structure organized combination of connected components designed to withstand actions and provide adequate rigidity[ISO 19900:2002]

ISO 19901-7:2005

structure orientation position of a structure in plan referenced to a fixed direction such as true north

ISO 19900:2002

structured breakdown of costs

list of cost elements associated with an option which has been structured taking into account the way in which the costs are acquired and recorded

ISO 15663-1:2000

studded connection connection in which thread-anchored studs are screwed into tapped holes

ISO 13533:2001

studded-flange connection

flanged end or outlet connection in which thread-anchored studs screwed into tapped holes replace the holes for bolt studs

ISO 10423:2003

sub short drill stem members with different rotary shouldered connections at each end for the purposes of joining unlike members of the drill stem

ISO 10424-1:2004

submerged arc-weld: Longitudinal or helical seam weld produced by the submerged arc-welding process defined in 3.2.1.2 (a).

ISO 3183-1:1996

Submerged arc-welded (SAW) pipe

Tubular product manufactured by forming from strip or plate and welding the abutting edges by addition of filler metal. The

ISO 3183-2:1996


pipe having a longitudinal (SAWL) or helical (SAWH) seam is produced by the automatic submerged arc process (but see also 6.3 in original document). At least one pass is made on the inside and at least one pass on the outside of the pipe. An intermittent or continuous single pass tack weld made by the gas metal arc-welding process is permitted.

submerged arc-welded pipeSAW pipe

tubular product, manufactured by forming from strip or plate and welding the abutting edges by addition of filler metal, in which the longitudinal (SAWL) or helical (SAWH) seam is produced by the automatic submerged-arc welding processcf. 6.3.NOTE At least one pass is made on the inside and at least one pass on the outside of the pipe. A single pass tack weld prior to the deposition of the submerged arc-weld metal is permitted (see 6.3.3 in original document).

ISO 3183-3:1999

submergence difference between the dynamic level and the PCP setting depth

ISO 15136-1:2001

subsea BOP blow-out preventer stack designed for use on subsea wellheads.NOTE This provides the capability to remotely shear and seal the wellhead bore and also provides the capability to circulate from the surface through the wellhead.

ISO 13628-4:1999

subsea casing hangers device that supports a casing string in the wellhead at the mudline

ISO 13628-4:1999

subsea completion equipment

specialized tree and wellhead equipment used to complete a well below the surface of a body of waterNOTE This may be made above a subsea wellhead or mudline suspension system. Equipment includes subsea wellhead, tree, tree appurtenances (e.g., tree cap, control pod), and associated subsea tree running tools.

ISO 13628-4:1999

subsea intervention all work carried out subsea ISO 13628-9:2000subsea production control system

control system operating a subsea production system during production operations

ISO 13628-6:2000

subsea termination interface

mechanism which forms the transition between the umbilical and the subsea termination or subsea umbilical distribution unitNOTE The interface comprises typically an umbilical armour termination, bend stiffener, hose and/or tube end fittings. If the umbilical contains electric cables, then electrical penetrator(s) and/or electrical connectors may also be incorporated.

ISO 13628-5:2002

subsea test tree assembly of valves positioned above the tubing hanger running tool located inside the subsea BOP and equivalent to the lower workover riser packageNOTE It is used to secure the well and provides a disconnect point for the C/WO riser. The subsea test tree can be configured for operation on horizontal or vertical trees.

ISO 13628-7:2005

subsea tree christmas tree placed at the seabed ISO 13628-3:2000subsea tree assembly of valves attached to the uppermost connection of

the subsea wellhead and used to control well productionISO 13628-7:2005

subsea umbilical distribution unit

mechanism for mechanically, electrically, optically and/or hydraulically connecting an umbilical independently to more than one subsea systemNOTE In this context, hydraulic fluids includes production system service fluids and produced fluid, control fluid and gas lift lines.

ISO 13628-5:2002

subsea umbilical termination

mechanism for mechanically, electrically, optically and/or hydraulically connecting an umbilical or jumper

ISO 13628-5:2002


bundle to a subsea systemNOTE In this context, hydraulic fluids include production system service fluids and produced fluid, control fluid, well service fluid and gas lift lines.

subsea wellhead wellhead assembly used during drilling and completion operations that has provisions to lock and seal to a subsea BOP stack and to the subsea tree

ISO 13628-7:2005

subsea wellhead housing

pressure-containing housing that provides a means for suspending and sealing the well casing strings installed during a floating drilling operation

ISO 13628-4:1999

subsea wireline/coiled tubing BOP

subsea BOP that attaches to the top of a subsea tree to facilitate wireline or coiled tubing intervention

ISO 13628-4:1999

substantive change change identified by the manufacturer which affects the performance of the product in the intended service

ISO 10423:2003

substantive design change

change to the design, identified by the supplier/manufacturer, that affects the performance of the product in the intended service condition

ISO 14310:2001

substructure any structure through which hook load, rotary load and/or setback load are transmitted

ISO 13626:2003

subsurface safety valveSSSV

device whose design function is to prevent uncontrolled well flow when closedNOTE These devices can be installed and retrieved by wireline or pump-down methods (wireline-retrievable) or be an integral part of the tubing string (tubing-retrievable).[ISO 10432]

ISO 10417:2004


automatically operated device installed in a well below the mudline and having the design function to prevent uncontrolled well flow in response to a hazardous situation

ISO 10418:2003


device whose design function is to prevent uncontrolled well flow when closedNOTE SSSVs can be installed and retrieved by wireline or pump-down methods (wireline-retrievable) or be an integral part of the tubing string (tubing-retrievable).

ISO 10432:2004

subsurface safety valve equipmentSSSV equipment

subsurface safety valve, and all components that establish tolerances and/or clearances which can affect its performance or interchangeability

ISO 10432:2004

subsurface-controlled subsurface safety valveSSCSV

SSSV actuated by the characteristics of the well itselfNOTE These devices are usually actuated by the differential pressure through the SSCSV (velocity type) or by tubing pressure at the SSCSV (high or low pressure type).

ISO 10417:2004

subsurface-controlled subsurface safety valveSSCSSV

SSSV actuated by the pressure characteristics of the well ISO 10418:2003

subunit assembly of items that provides a specific function that is required for the equipment unit within the main boundary to achieve its intended performance

ISO 14224:1999

suction compartment general any compartment from which a pump removes fluid ISO 13501:2005suction compartment specific area of the check/suction section that supplies

drilling fluid to the suction of the drilling-fluid pumpsISO 13501:2005

suction-specific speed index relating flow, NPSHR and rotative speed for pumps of similar geometrySee Annex A.

ISO 13709:2003

sulfide stress crackingSSC

cracking of metal involving corrosion and tensile stress (residual and/or applied) in the presence of water and H2SNOTE SSC is a form of hydrogen stress cracking (HSC) and involves embrittlement of the metal by atomic hydrogen that is produced by acid corrosion on the metal surface. Hydrogen uptake is promoted in

ISO 10432:2004


the presence of sulfides. The atomic hydrogen can diffuse into the metal, reduce ductility and increase susceptibility to cracking. High strength metallic materials and hard weld zones are prone to SSC.[ISO 15156-1]

sulfide stress crackingSSC

cracking of metal involving corrosion and tensile stress (residual and/or applied) in the presence of water and H2SNOTE SSC is a form of hydrogen stress cracking (HSC) and involves embrittlement of the metal by atomic hydrogen that is produced by acid corrosion on the metal surface. Hydrogen uptake is promoted in the presence of sulfides. The atomic hydrogen can diffuse into the metal, reduce ductility and increase susceptibility to cracking. High strength metallic materials and hard weld zones are prone to SSC.

ISO 15156-1:2001

sulfide stress-cracking service

service in which the process stream contains water or brine and contains a sufficient concentration of hydrogen sulfide (H2S) to induce sulfide stress-cracking of susceptible materials

ISO 13703:2000

sulfide-stress cracking cracking of metallic materials due to exposure to fluid containing hydrogen sulfide

ISO 10423:2003

sump pan or lower compartment below the lowest shale-shaker screen

ISO 13501:2005

supplier/manufacturer company, organization or entity that designs, manufactures and/or markets side-pocket mandrel products

ISO 17078-1:2004

support ribslegs

metal structure which provides a stable footing when the valve is set on a fixed baseNOTE Adapted from ISO 14313:1999.

ISO 14723:2001

support ribs or legs metal structure which provides a stable footing when the valve is set on a fixed base

ISO 14313:1999

support shoulder shoulder or projection on the external surface of a connector or the riser component for supporting the riser system or well control equipment during riser running operations

ISO 13628-7:2005

surface control system surface equipment including manifolding, sensors, and power source to control the SCSSV

ISO 10417:2004

surface finishRa

measurement of the average roughness of a surfaceNOTE 1 It is expressed in micrometres (µm).NOTE 2 All of the surface finishes given in this International Standard are to be considered maxima.

ISO 13533:2001

surface safety valveSSV

automatic wellhead valve assembly which closes upon loss of power supplyNOTE Where used in this International Standard, the term is understood to include an SSV valve and SSV actuator.

ISO 10417:2004


automatically operated wellhead valve assembly which will isolate the reservoir fluids upon loss of the power medium

ISO 10418:2003


automatic wellhead valve assembly which closes upon loss of power supplyNOTE Where used in this International Standard, the term is understood to include an SSV valve and SSV actuator.

ISO 10423:2003


safety device that is located in the production bore of the well tubing above the wellhead (platform well), or at the point of subsea well production embarkation onto a platform, as defined in API RP 14H, and that will close upon loss of hydraulic pressure

ISO 13628-6:2000

surface tree device which provides flow control of the production and/or annulus bores during both tubing hanger installation and subsea tree installation/workover operationsNOTE It can also have provisions to support the mass of the C/WO riser system.

ISO 13628-7:2005

surface tree adapter joint

crossover from the standard riser joint connector to the connection at the bottom of the surface treeNOTE Its bore configuration is consistent with the standard riser

ISO 13628-7:2005


joint. This speciality joint is usually made up to the surface tree prior to installation.

surface-controlled subsurface safety valveSCSSV

SSSV controlled from the surface by hydraulic, electrical, mechanical or other means

ISO 10417:2004


SSSV controlled from the surface by hydraulic, electric, mechanical or other means

ISO 10418:2003


safety device that is located in the production bore of the well tubing below the subsea wellhead, and that will close upon loss of hydraulic pressure, as defined in ISO 10432NOTE Its function is to provide closure of the well flow in the event of catastrophic loss of the primary flow control safety equipment provided by the subsea tree assembly, or when commanded from the surface facility, e.g. in the event of an emergency shutdown Level 0.

ISO 13628-6:2000

surge vessel motion along the fore/aft axis ISO 13628-7:2005surge pressure pressure produced by sudden changes in the velocity of the

moving stream of fluids inside the riserISO 13628-7:2005

surveillance period interval of time between the start date and end date of data collection

ISO 14224:1999

survival craft craft capable of sustaining the lives of persons in it from the time of abandoning the installation

ISO 15544:2000

survival suit protective suit made of waterproof materials which reduces the body heat-loss of a person wearing it in cold water

ISO 13702:1999

survival suit protective suit made of materials which reduce body heat-loss of a person wearing it in cold water

ISO 15544:2000

sustained wind speed time-averaged wind speed with an averaging duration of 10 min or longer

ISO 19901-1:2005

swab valvecrown valve

uppermost valve on the vertical bore of the christmas tree above the flowline outlet

ISO 10423:2003

sway vessel motion along the port/starboard axis ISO 13628-7:2005sweet service service conditions which have a H2S content less than that

specified by ISO 15156 at the design pressureNOTE For the purposes of this provision, NACE MR0175 is equivalent to ISO 15156.

ISO 13628-10:2005

sweet service service conditions with an H2S content not exceeding the minimum specified by ANSI/NACE MR0175 at the design pressure

ISO 13628-2:2000

swell sea state in which waves generated by winds remote from the site have travelled to the site, rather than being locally generated

ISO 19901-1:2005

swivel device at the top of the drill stem that permits simultaneous circulation and rotation

ISO 10424-1:2004

swivel flange (type 17SV)

flange assembly consisting of a central hub and a loose flange rim which is free to rotate about the hubNOTE The rotating flange rim has holes to accept bolts. The central hub has a sealing mechanism which will engage an ISO ring gasket. ISO type SV swivel flanges will mate with standard ISO type 17SS and 6BX flanges of the same size and pressure rating.

ISO 13628-4:1999

system assembled section of piping consisting of a representative range of pipes, fittings, connections, attachments, supports, penetrations and associated coatings, e.g. for thermal insulation or fire protection, as would be found in service

ISO 14692-1:2002

system pressure test field hydrostatic leak-tightness pressure test of the complete riser system performed after installation and before start of operation

ISO 13628-7:2005

system test pressure test pressure applied to the riser during system field pressure ISO 13628-7:2005


test of the C/WO riser system performed after installation and before start of operation

tack weld: Seam weld used to align the abutting edges until the final seam welds are produced.

ISO 3183-1:1996

tagged equipment equipment tagged in accordance with the project coding manual

ISO 19901-5:2003

tally, verb add up lengths of OCTG to arrive at an aggregate ISO 15463:2003tangent straight section at the ends of an induction bend ISO 15590-1:2001tangent straight section at the ends of the fitting


target wallre-radiating wall

vertical refractory firebrick wall which is exposed to direct flame impingement on one or both sides

ISO 13705:2001

taut-line mooring mooring system where the restoring action is provided by elastic deformation of mooring lines

ISO 19900:2002

taut-line mooring mooring system where the restoring action is provided by elastic deformation of mooring lines[ISO 19900:2002]

ISO 19901-7:2005

technical drawings drawings showing the required dimensions, surface finishes, deviations of form and position, tolerances and all other details required to provide the product, process or service

ISO 13880:1999

technical specification document that prescribes technical requirements to be fulfilled by the product, process or service in order to comply with the functional specificationNOTE A technical specification should indicate, whenever appropriate, the procedure(s) by means of which it might be determined whether the requirements given are fulfilled.

ISO 13879:1999

technical specification document that defines technical requirements to be fulfilled by the product, process or service in order to comply with the functional specificationNOTE 1 A technical specification should indicate, whenever appropriate, the procedure(s) by means of which it may be determined whether the requirements given are fulfilled.NOTE 2 A technical specification may be a standard, be included in a standard(s) or be independent of a standard.NOTE 3 A technical specification expresses the technical requirements expressed by characteristics, features, properties and all information that is required to produce a product, execute a process or provide a service, including objective evidence that the product, process or service will comply with the functional requirements.

ISO 13880:1999

technical specification parameter(s) stating the operating limit(s) relating to the manufacture of the component parts or assemblies

ISO 17078-1:2004

tee pressure-containing fitting with three openingsNOTE Two openings opposite one another form the run portion of the tee, and one opening is at 90° to the line of the run.Tees may be equipped with threads, flanges, studs or other end connectors.

ISO 10423:2003

temperature allowanceTA

part of the design metal temperature that is included for process- or flue-gas maldistribution, operating unknowns, and design inaccuraciesNOTE The temperature allowance is added to the calculated maximum tube metal temperature or to the equivalent tube metal temperature to obtain the design metal temperature (see 2.4 in original document).

ISO 13704:2001

temperature allowance number of degrees Celsius (Fahrenheit) to be added to the process fluid temperature to account for flow maldistribution and operating unknownsNOTE The temperature allowance is added to the calculated

ISO 13705:2001


maximum tube-metal temperature or the equivalent tube-metal temperature to obtain the design metal temperature

temperature cycle range

specified range of temperature fluctuation at which the product is designed to operateNOTE The temperature cycle range is applicable anywhere within the product’s temperature range.

ISO 14310:2001

temperature range specified range of temperature at which the product is designed to operate

ISO 14310:2001

tempering heating, one or more times, to a specific temperature below the lower critical temperature and holding at that temperatureNOTE 1 Tempering is often preceded by quench hardening.NOTE 2 Adapted from ISO 4885.

ISO 13680:2000

tempering heat treatment by heating to a temperature below the lower critical temperature, for the purpose of decreasing the hardness and increasing the toughness of hardened steel, hardened cast iron and, sometimes, normalized steel

ISO 15156-2:2003

temporaries, noun pl components, assemblies or utility items which are temporarily installed during a specific loading condition and removed afterwards, either prior to or after installation

ISO 19901-5:2003

temporary refugeTR

place provided where personnel can take refuge for a predetermined period whilst investigations, emergency response and evacuation preplanning are undertaken

ISO 13702:1999

temporary refugeTR

place where personnel can take refuge for a pre-determined period whilst investigations, emergency response and evacuation pre-planning are undertaken[ISO 13702:1999, definition 2.1.52]

ISO 15138:2000

temporary refugeTR

place provided where personnel can take refuge for a predetermined period whilst investigations, emergency response and evacuation preparations are undertakenNOTE A temporary refuge, where provided, need not necessarily be useable under all accident scenarios.

ISO 15544:2000

tender offer made by an organization in response to an invitation to provide a product

ISO/TS 29001:2003

tensile armour layer structural layer consisting of helically wound metallic wires, typically with a lay angle of between 20° and 55°NOTE Tensile armour layers are typically counter-wound in pairs, and are used to sustain, totally or partially, tensile loads and internal pressure.

ISO 13628-2:2000

tensile load maximum force creating tension that may be applied to a side-pocket mandrel, as defined by the supplier/manufacturer

ISO 17078-1:2004

tensile strength maximum tensile stress that a material is capable of sustaining that is calculated from the maximum load during a tensile test carried to rupture and the original cross-sectional area of the specimen

ISO 10424-1:2004

tensile strength tensile strength of elastomeric materials in this part of ISO 13628 is defined in accordance with ISO 37NOTE For the purposes of this provision, ASTM D638 is equivalent to ISO 37.

ISO 13628-10:2005

tensile strength maximum tensile stress which a material is capable of sustaining; calculated from the maximum load during a tension test carried to rupture and the original cross-sectional area of the specimen

ISO 13628-2:2000

tensile strength ultimate strength ratio of maximum load to original cross-sectional areaNOTE See ISO 6892.

ISO 15156-2:2003

tensile test mechanical test used to determine the behaviour of material under axial loading

ISO 10424-1:2004


tension joint special riser joint that provides a means for tensioning the C/WO riser with the floating vessel's tensioning system during open-sea workover modeNOTE When in use, the tension joint is located below the slick joint, which has a provision for attaching the tensioner unit to the riser.

ISO 13628-7:2005

tension ring attachment point on the tension joint for the floating vessel tensioning lines

ISO 13628-7:2005

tensioner system device that applies a close to constant tension to the riser string while compensating for the relative vertical motion (stroke) between the floating vessel and the top of the deployed riser string

ISO 13628-7:2005

tensioning stretching of a screening surface of a shale shaker to the proper tension while positioning it within the vibrating frame

ISO 13501:2005

terminal flanged or welded connection to or from the coil providing for inlet and outlet of fluids

ISO 13705:2001

termination head part of the PICS interfacing with the end of the sealine ISO 13628-9:2000tertiary method <for escape to the sea> method of leaving the instsllation

which relies considerably on the individual's own actionISO 13702:1999

tertiary method <for escape to the sea> method which relies considerably on the individual’s own action

ISO 15544:2000

test two or more valid hardness test readings that have been made in the same test area

ISO 15463:2003

test agency organization which provides a test facility and administers a test program that meets the validation test requirements of this International StandardNOTE See Annex A for test agency requirements.

ISO 10432:2004

test area area on OCTG that has been ground or filed smooth and flat to remove the decarburized surface material, on which a hardness test is performed

ISO 15463:2003

test batch group of items representing a production batch whose conformity with a specified requirement can be determined by testing representative samples in accordance with a defined procedure

ISO 15156-2:2003

test block special precision blocks, used as standards to verify calibration of an inspection instrument

ISO 15463:2003

test load envelope extremes of loads (axial load, pressure, bending) and temperature within which the connection will perform cyclicallyNOTE The manufacturer has the primary responsibility for defining the test load envelope for their connection products (see 4.1).

ISO 13679:2002

test piece welded assembly prepared for the purpose of approving a welding procedure specification, welder or welding operator

ISO 13847:2000

test pressure pressure above working pressure used to demonstrate structural integrity of a pressure vessel

ISO 10424-1:2004

test pressure pressure at which the equipment is tested based upon all relevant design criteria

ISO 10432:2004

test pressure pressure at which the equipment is tested based upon all relevant design criteriaNOTE See 6.5.1 for test pressure requirements.

ISO 16070:2005

test pressure maximum differential pressure between the applied pressure and atmospheric pressure, as specified by the pertinent test procedure, when the test is conducted in such a way that the article being tested is a “closed” system with no inputs or outputs allowed during the test time period

ISO 17078-1:2004


test sample assembly of a connector and two pieces of pipe specifically for testing

ISO 21329:2004

test section test apparatus which contains the SSSV and provides for connection to a test facility's validation test apparatus

ISO 10432:2004

test temperature temperature at which the equipment is tested based upon all relevant design criteria

ISO 16070:2005

test temperature temperature, as specified by the pertinent test procedure, at which the test is conducted

ISO 17078-1:2004

test tool tool used to run into the wellhead in order to perform a pressure test

ISO 10423:2003

test unit prototype unit upon which a design verification test is conducted

ISO 13535:2000

test unit unit formed by tubes from the same heat, with the same outside diameter and wall thickness, the same grade, the same manufacturing process, the same final heat-treatment conditions and the same cold-working parameters

ISO 13680:2000

test unit prototype unit upon which a design verification test is conducted

ISO 14693:2003

test unit fitting or test piece of the same designation, starting material wall thickness, heat, manufacturing procedure specification, and heat treatment condition

ISO 15590-2:2003

test weight sum of the dry weight plus the fluid content required to test the equipment and assembly

ISO 19901-5:2003

testing action carried out on a piece of equipment to ensure that it can perform a required function

ISO 13534:2000

TFL piping system all piping from the surface lubricator through the flowline and tubing to the deepest point in the well to which TFL tools can be circulated

ISO 13628-3:2000

thermal efficiency total heat absorbed divided by the total input of heat derived from the combustion of fuel (hL) plus sensible heats from air, fuel and any atomizing medium

ISO 13705:2001

Thermomechanical forming

A forming process in which the final deformation is carried out in a certain temperature range leading to a material condition with certain properties which cannot be achieved or repeated by heat treatment alone. Subsequent heating above 580 °C may lower the strength values.The abbreviated form of this delivery condition is M.NOTES3 Thermomechanical forming leading to the delivery condition M may include processes of increased cooling rates without or with tempering including self-tempering but excluding definitively direct quenching and quenching and tempering.4 As a consequence of lower carbon content and carbon equivalent values material in the delivery condition M has improved weldability properties.

ISO 3183-2:1996

thermomechanical forming

forming process in which the final deformation is carried out in a certain temperature range, leading to a material condition with certain properties which cannot be achieved or repeated by heat treatment aloneNOTE 1 Subsequent heating above 580 C may lower the strength values.NOTE 2 The abbreviated form of this delivery condition is M.NOTE 3 Thermomechanical forming leading to the delivery condition M may include processes of increased cooling rates without or with tempering, including self-tempering but excluding definitively direct quenching and quenching and tempering.

ISO 3183-3:1999

thermoset plastic which, when cured by application of heat and/or ISO 14692-1:2002


chemical reaction, changes into a substantially infusible and insoluble material

thermosetting polyester thermosetting class of resin produced by dissolving unsaturated, generally linear, alkyd resins in a vinyl-type active monomer such as styrene, methylstyrene or diallyl phthalateNOTE Cure is effected through vinyl polymerization using peroxide catalysts and promoters or heat to accelerate the reaction.

ISO 14692-1:2002

thickening time time for a cement slurry to develop a selected BcNOTE The results of a thickening time test provide an indication of the length of time a cement slurry remains pumpable under the test conditions.

ISO 10426-1:2005

thickening time time required for a cement slurry to develop a selected Bearden consistency valueNOTE The results of a thickening-time test provide an indication of the length of time a cement slurry can remain pumpable under the test conditions.

ISO 10426-2:2003

third party independent party qualified to witness, confirm or approve the referenced data, result, procedure, test orqualification

ISO 13628-2:2000

thread compound substance that is applied to threaded oilfield pipe connections prior to make-up to assist in their lubrication during assembly and disassembly and in their sealing against high internal and external pressures in serviceNOTE Some thread compounds may also contain substances that provide storage compound properties.

ISO 13678:2000

thread compound/connection system

system consisting of the various critical threaded pipe connection components, including the specific connection geometry, and the individual connection materials and coatings combined with the thread compound

ISO 13678:2000

thread form thread profile in an axial plane for a length of one pitch ISO 10424-1:2004thread form profile of a thread in an axial (longitudinal) plane for a length of

one pitchISO 15463:2003

thread lot all products manufactured on a given machine during a continuous production cycle that is not interrupted by a catastrophic tool failure or injurious machine malfunction (excluding worn tools or minor tool breakage), tool holder change (except rough boring bar) or any other malfunction of either threading equipment or inspection gauges

ISO 13679:2002

thread protector cap or insert used to protect threads and seals during handling, transportation and storage

ISO 10423:2003

thread protector cap or insert used to protect threads and seals during handling, transportation and storage

ISO 11960:2004

thread protector protection device placed on the end of OCTG to protect threads and seals from damage

ISO 15463:2003

thread seal seal or sealing system, which relies on intimate fitting of the thread-form and usually entrapment of the thread compound within the thread-form to achieve a seal

ISO 13679:2002

threaded coupling coupling having matching threaded members to form engagement

ISO 13625:2002

threaded flange flange having a sealing face on one side and a female thread on the other for the purpose of joining flanged connections to threaded connections

ISO 10423:2003

threshold investigation level established during EMI or UT inspection, above which indications are further investigated

ISO 15463:2003

throat bushing device that forms a restrictive close clearance around the ISO 13709:2003


sleeve (or shaft) between the seal and the impellerthroat bushing device that forms a restrictively close clearance around the

sleeve (or shaft) between the inner seal and the impellerISO 21049:2004

throttle bushing device that forms a restrictively close clearance around the sleeve (or shaft) at the outboard end of a mechanical seal gland plate

ISO 21049:2004

through-conduit valve valve with an unobstructed and continuous cylindrical opening ISO 14313:1999through-conduit valve valve with an unobstructed and continuous cylindrical opening

[ISO 14313:1999]ISO 14723:2001

thruster-assisted mooring

stationkeeping system consisting of mooring lines and thrusters

ISO 19901-7:2005

tieback adapter device used to provide the interface between mudline suspension equipment and subsea completion equipment

ISO 13628-4:1999

time domain timewise, incremental simulation of riser responseNOTE Offers the capability of modelling hydrodynamic and structural non-linearity.

ISO 13628-7:2005

tolerable risk risk which is accepted in a given context based on the current values of society

ISO 17776:2000

tolerance amount of variation permitted ISO 10424-1:2004tolerance permissible deviation from the specified value ISO 15463:2003tool joint heavy coupling element for drill pipe having coarse, tapered

threads and sealing shouldersISO 10424-1:2004

top connectorbottom hole test adapter

uppermost fitting of a christmas tree which allows full-bore access to the christmas tree

ISO 10423:2003

top event particular hazardous event considered in the development of fault and event trees

ISO 17776:2000

top tensioned riser vertical or nearly vertical riser supported by top tension in combination with boundary conditions that allow for relative riser/vessel motions in vertical direction and constrained to follow the horizontal vessel motion at one or several locations

ISO 13628-7:2005

topsides structures and equipment placed on a supporting structure (fixed or floating) to provide some or all of a platform’s functionsNOTE 1 For a ship-shaped floating structure, the deck is not part of the topsides.NOTE 2 For a jack-up, the hull is not part of the topsides.NOTE 3 A separate fabricated deck or module support frame is part of the topsides.

ISO 19900:2002

torsional balance pipe characteristic that is achieved by designing the structural layers in the pipe, such that axial and pressure loads do not induce significant twist or torsional loads in the pipe

ISO 13628-10:2005

torsional balance pipe characteristic that is achieved by designing the structural layers in the pipe so that axial and pressure loads do not induce significant twist or torsional loads in the pipe

ISO 13628-2:2000

torsional damping absorption or dissipation of oscillatory rotary energyNOTE Torsional damping may be necessary to limit the build-up of transient or steady-state torsional resonant oscillations in a system.

ISO 10441:1999

torsional natural frequency

natural rotational oscillatory frequency of a system composed of rotating mass inertias acting in combination with the restraining torsional rigidities of the connected shafts and couplings

ISO 10441:1999

torsional stiffness ratio of the applied torque to the resulting angular displacement of either a complete coupling or part of a coupling, such as the spacerNOTE With some types of coupling, the torsional stiffness may not be constant but may be a function of the magnitude of the torque and,

ISO 10441:1999


with oscillating torques, also the frequency.torsional stiffness torque required to produce unit angular displacement between

the coupled shaftsNOTE Couplings with elastomeric flexible-elements may exhibit a dynamic torsional stiffness which is significantly different from the static value.

ISO 14691:1999

torsional tuning changing of one or more torsional natural frequencies of a coupled system to avoid system resonance at a known excitation frequencyNOTE Torsional tuning may be accomplished by varying one or more of the torsional stiffnesses or mass inertias in the system.

ISO 10441:1999

torsionally resilient coupling

flexible coupling incorporating increased torsional flexibility and/or torsional dampingNOTE A torsionally resilient coupling may or may not also be designed to accommodate misalignment and/or axial displacement.

ISO 10441:1999

total dilution volume of drilling fluid that would be built to maintain a specified volume fraction of drilled solids over a specified interval of footage if there were no solids removal system

ISO 13501:2005

total heat release heat liberated from the specified fuel, using the lower heating value of the fuel

ISO 13705:2001

total indicated runouttotal indicator readingTIR

difference between the maximum and minimum readings of a dial indicator, or similar device, monitoring a face or cylindrical surface, during one complete revolution of the monitored surfaceNOTE With a truly flat face or a truly cylindrical surface, the TIR implies respectively an out-of-squareness equal to the reading or an eccentricity equal to half the reading. If the surface in question is not truly flat or cylindrical, interpretation of the meaning of TIR is more complex and may represent ovality or lobing.

ISO 10441:1999

total indicated runouttotal indicator readingTIR

runout of a diameter or face determined by measurement with a dial indicatorNOTE The indicator reading implies an out-of-squareness equal to the reading or an eccentricity equal to half the reading.

ISO 13691:2001

total indicator readingtotal indicated runoutTIR

difference between the maximum and minimum readings of a dial indicator or similar device, monitoring a face or cylindrical surface, during one complete revolution of the monitored surfaceNOTE For a perfectly cylindrical surface, the indicator reading implies an eccentricity equal to half the reading. For a perfectly flat face the indicator reading gives an out-of-squareness equal to the reading. If the diameter in question is not perfectly cylindrical or flat, interpretation of the meaning of TIR is more complex and may represent ovality or lobing.

ISO 13709:2003

total indicator readingtotal indicated runoutTIR

difference between the maximum and minimum readings of a dial indicator or similar device when monitoring a face or cylindrical surface during one complete revolution of the monitored surfaceNOTE For a perfectly cylindrical surface, the indicator reading implies an eccentricity equal to half the reading. For a perfectly flat face, the indicator reading gives an out-of-squareness equal to the reading. If the diameter in question is not perfectly cylindrical or flat, interpretation of the meaning of TIR is more complex, and may represent ovality or lobing.

ISO 21049:2004

total non-blanked area net unblocked area that will permit the passage of fluid through a screenNOTE 1 It is expressed in square metres (square feet).NOTE 2 Some screen designs can eliminate as much as 40 % of the gross screen panel area from fluid flow due to backing-plate and bonding-material blockage.

ISO 13501:2005


totally enclosed motor-propelled survival craftTEMPSC

craft capable of sustaining the lives of persons in distress from the time of abandoning the installation

ISO 13702:1999

tow untwisted fibrous bundle ISO 14692-1:2002tow tex mass of a fibrous bundle expressed per unit length ISO 14692-1:2002tow-out final towing of a complete floating structure to the offshore

production fieldISO 19901-5:2003

traceability job lotability to identify individual components as originating from a particular job lot, including the particular heat(s)

ISO 17078-1:2004

transducer device which converts one form of energy to anotherEXAMPLES Ultrasonic probes, search coils, eddy-current probes and most other detectors.

ISO 15463:2003

transition zone areas at the start and stop points of bending which include material that extends from the unheated mother pipe to the material that has been heated to the full bending temperature

ISO 15590-1:2001

transport actions required to ship SSSV system equipment from one geographic location to another

ISO 10417:2004

transport loading condition in which a major assembly or a module is transferred from one inshore/at shore location to another location or to the offshore production field

ISO 19901-5:2003

transverse across, usually circumferential or substantially circumferential in direction

ISO 15463:2003

tree cap protective cover for the upper tree connectionNOTE This may be used to contain pressure, and may be an integral part of the tree control system.

ISO 13628-4:1999

tree connector mechanism to join and seal a subsea tree to a subsea wellheadNOTE This may require diver assistance for installation, or be hydraulically actuated to permit remote operation.

ISO 13628-4:1999

tree guide frame structural framework to provide guidance with the PGB interface, for installation of the subsea tree on the subsea wellhead, and which also provides support for tree flowlines and connection equipment, control pods, anodes, and counterbalance weights

ISO 13628-4:1999

tree running tool device used to run and land the subsea tree on the subsea wellhead

ISO 13628-7:2005

tree side outlet point where a bore exits at the side of the tree block ISO 13628-4:1999tree upper connection uppermost fitting of a subsea tree which allows full bore

access to the treeNOTE The connection profile may be API or other proprietary types (see re-entry spool).

ISO 13628-4:1999

trepan, verb produce a hole through a part by boring a narrow band or groove around the circumference of the hole and removing the solid central core of material

ISO 13533:2001

tribocharging generation of electrostatic charge caused by moving contact of one insulating material over another

ISO 14692-1:2002

trip speed rotational speed at which the independent overspeed shutdown system operates to shut down a turbine

ISO 10437:2003

trip speed speed at which the independent emergency overspeed device operates to shut down a prime moverNOTE For constant speed motor drivers, this is the speed corresponding to the synchronous speed of the motor at the maximum frequency of the electrical supply.

ISO 10439:2002

trip speed speed at which independent emergency overspeed devices operate to shut down a prime moverNOTE It is expressed in revolutions per minute.

ISO 10440-1:2000


trip speed speed at which independent emergency overspeed devices operate to shut down a prime moverNOTE Trip speed is expressed in revolutions per minute.

ISO 10440-2:2001

trip speed rotational speed of the coupling corresponding to the speed at which the independent emergency overspeed device operates to shut down a variable speed prime moverNOTE Where the term is used in relation to a machine train driven by a constant-speed, alternating-current electric motor, the trip speed is assumed to be the coupling speed corresponding to the motor synchronous speed at the maximum supply frequency.

ISO 10441:1999

trip speed speed at which the independent emergency overspeed device operates to shut down a prime moverNOTE For constant speed motor drivers, this is the speed corresponding to the synchronous speed of the motor at the maximum frequency of the electrical supply.[ISO 10439:2002, definition 3.19]

ISO 10442:2002

trip speed rotational speed at which the independent emergency overspeed device operates to shut down a prime moverNOTE 1 For fixed-frequency alternating current motor drives, the trip speed is taken to be the speed corresponding to the synchronous speed of the motor at the highest supply frequency.NOTE 2 For steam turbines and reciprocating engines, the trip speed is at least 110 % of the maximum continuous speed. For gas turbines, the trip speed is at least 105 % of the maximum continuous speed.

ISO 13691:2001

trip speed speed at which the independent emergency overspeed device operates to shut down a variable speed prime mover

ISO 13707:2000

trip speed <electric motor driver>synchronous speed at maximum supply frequency

ISO 13709:2003

trip speed <variable-speed driver>speed at which the independent emergency overspeed device operates to shut down the driver

ISO 13709:2003

trip speed rotational speed of the coupling corresponding to the speed at which the independent emergency overspeed device operates to shut down a variable-speed prime moverNOTE Where the term is used in relation to a machine train driven by a constant-speed, alternating-current electric motor, the trip speed is assumed to be the coupling speed corresponding to the motor synchronous speed at the maximum supply frequency.

ISO 14691:1999

trip tank gauged and calibrated vessel used to account for fill and displacement volumes as pipe is pulled from and run into the holeNOTE Close observation allows early detection of formation fluid entering a wellbore and of drilling fluid loss to a formation.

ISO 13501:2005

tropical cyclone closed atmospheric or oceanic circulation around a zone of low pressure that originates over the tropical oceansNOTE 1 The circulation is counter-clockwise in the northern hemisphere and clockwise in the southern hemisphere.NOTE 2 At maturity, the tropical cyclone can be one of the most intense storms in the world, with wind speeds exceeding 90 m/s and accompanied by torrential rain.NOTE 3 In some areas, local terms for tropical cyclones are used. For example, tropical cyclones are typically referred to as hurricanes in the Gulf of Mexico and North Atlantic, while in the South China Sea and NW Pacific they are called typhoons. In the South Pacific and South Indian Ocean, however, they are commonly referred to as cyclones.NOTE 4 The term cyclone is also used to refer to a tropical storm with sustained wind speeds in excess of 32 m/s (Beaufort Force 12).

ISO 19901-1:2005

tsunami long period sea waves caused by rapid vertical movements of ISO 19901-1:2005


the sea floorNOTE The vertical movement of the sea floor is often associated with fault rupture during earthquakes or with seabed mud slides.

tsunami long period sea waves caused by rapid vertical movements of the sea floorNOTE The vertical movement of the sea floor is often associated with fault rupture during earthquakes or with seabed mud slides.

ISO 19901-2:2004

tube bundle assembly of headers, tubes and frames ISO 13706:2005tube guide device used with vertical tubes to restrict horizontal movement

while allowing the tube to expand axiallyISO 13705:2001

tube retainer device used to restrain horizontal radiant tubes from lifting off the intermediate tube supports during operation

ISO 13705:2001

tube sampling sampling method comprising withdrawal of powdered sample from bag or bulk via a cylindrical device pushed into the sample, locked shut and withdrawn

ISO 10416:2002

tube supporttube sheet

device used to support tubes ISO 13705:2001

tubing pipe placed within a well to conduct fluid from the well’s producing formation into the christmas tree or to conduct kill or treatment fluids in a wellNOTE Tubing is distinguished from casing as being retrievable during the life of the well.

ISO 10423:2003

tubing pipe placed within a well and serving to produce well fluids or to inject fluids

ISO 11960:2004

tubing pipe used in wells to conduct fluid from the well's producing formation into the subsea tree

ISO 13628-7:2005

tubing tube used in wells to conduct fluid from the well's producing formation into the Christmas tree or vice versa

ISO 13680:2000

tubing pipe placed within a well to serve as a production or injection conduit

ISO 14310:2001

tubing pipe placed within a well and serving as a conduit for produced well fluids or to inject fluids

ISO 15463:2003

tubing hanger component used to support the downhole completion tubing stringNOTE It is also typically used to seal and contain the completion annulus from the environment.

ISO 13628-7:2005

tubing hanger mandrel mechanism used to support a tubing string in a tubing head by means of a male or female thread attached to the tubing

ISO 10423:2003

tubing hanger running tool

device used to run, land and lock the tubing hanger inside the wellhead, tubing spool, or subsea tree

ISO 13628-7:2005

tubing head adapter equipment which adapts the uppermost connection of a tubing head to the lowermost valve of the christmas tree

ISO 10423:2003

tubing head spool piece of equipment attached to the uppermost casing head or smallest casing string which serves to suspend the tubing and to seal the annular space between the tubing and casing

ISO 10423:2003

tubing riser riser which consists of one or more individual strings of production tubing and a hydraulic control umbilicalNOTE If multiple tubing strings are used, they can be left either independent of each other, or secured together using some type of clamping device. The hydraulic control umbilical is normally clamped or strapped to one of the tubing strings as it is run.

ISO 13628-7:2005

tubing-conveyed pump pump whose stator is connected to the bottom of the tubing ISO 15136-1:2001tubing-retrievable safety valve

downhole safety valve run in the well on tubingNOTE It is normally surface-controlled and has an ID close to the size of the tubing bore, thereby providing an almost unrestricted bore.

ISO 13628-3:2000

tubular component cylindrical component (pipe) having a longitudinal hole, used ISO 15156-2:2003


in drilling/production operations for conveying fluidsturbine manufacturer company that designs, manufactures, tests and provides

service support for the turbineISO 10437:2003

turndown percentage of change in inlet volume flow (referred to rated inlet volume flow) between the rated inlet volume flow and the surge point inlet volume flow at the rated head, when the unit is operating at rated suction temperature and gas composition

ISO 10439:2002

twin-seat valve both seats bi-directional valve with two seats, each sealing in either directionNOTE Adapted from ISO 14313:1999.

ISO 14723:2001

twin-seat valve one seat uni-directional and one seat bi-directional valve with two seats, one sealing in one direction and the other in either directionNOTE Adapted from ISO 14313:1999.

ISO 14723:2001

twin-seat, both seats bi-directional, valve

valve with two seats, each sealing in both directions ISO 14313:1999

twin-seat, one seat uni-directional and one seat bi-directional, valve

valve with two seats, one sealing in one direction and the other in either direction

ISO 14313:1999

type SSSV equipment with unique characteristics which differentiate it from other functionally similar SSSV equipmentEXAMPLES SCSSV, velocity-type SSCSV and low-tubing-pressure-type SSCSV are types of SSSV.

ISO 10432:2004

type components of common functionNOTE Pipes, prime connections, flanges, reducers, tees and elbows are examples of different component types.

ISO 14692-1:2002

type lock mandrel or landing nipple equipment with unique characteristics which differentiate it from other functionally similar lock mandrel or landing nipple equipment

ISO 16070:2005

type kind of side-pocket mandrel or other component (e.g. valve, flow control device, latch, wireline tool, etc.) that is distinguished by a particular method of being positioned and retrieved from a well, and that has a specific name and/or description

ISO 17078-1:2004

Type 1 component [weld]

component [weld] that isolates pressure and/or may be loaded in tensionNOTE The tension may be the result of axial loads on the packer or bridge plug during run-in, setting, in situ, retrieval, or any other source.

ISO 14310:2001

Type 2 component [weld]

component [weld] that does not meet the criteria of a Type 1 component [weld]

ISO 14310:2001

Type A seal balanced, inside-mounted, cartridge-design pusher seal with multiple springs and in which the flexible element normally rotates

ISO 21049:2004

Type B seal balanced, inside-mounted, cartridge-design non-pusher (metal bellows) seal in which the flexible element normally rotates, and in which the secondary sealing elements are elastomeric O-rings

ISO 21049:2004

Type C seal balanced, inside-mounted, cartridge-design non-pusher (metal bellows) seal in which the flexible element is normally stationary, and in which the secondary sealing elements are flexible graphite

ISO 21049:2004

type test test performed to provide evidence that the design meets the requirements of the functional specification

ISO 13880:1999

type testing exposure of a system to a fire insult to qualify the assembled system components for a defined range of service conditions

ISO 14692-1:2002

ultimate strength ultimate strength in this part of ISO 13628 is defined in ISO 13628-10:2005


accordance with ISO 6892NOTE For the purposes of this provision, ASTM A370 is equivalent to ISO 6892.

ultra-deep water water depth exceeding 1 830 m (6 000 ft)NOTE 1 Since the physical circumstances of any situtation will change as a function of water depth, use of the term “ultra-deep water” implies that it may be necessary to consider design and/or technology alternatives.NOTE 2 For description of pressure and temperature ratings, the definition given in the applicable subsystem International Standard and other relevant standards and design codes is used.

ISO 13628-1:2005

ultrasonic having a frequency above the audible range, i.e. above 20 kHz ISO 15463:2003ultrasonic test NDT method using high-frequency sound waves ISO 15463:2003ultrasonic velocity speed at which ultrasonic sound waves travel through a

mediumISO 15463:2003

ultraviolet radiationUV

electromagnetic radiation in the frequency band just above the visible spectrum

ISO 14692-1:2002

umbilical group of electric cables, hoses or steel tubes, either on their own or in combination (or with optical fibre cables), cabled together for flexibility and oversheathed and/or armoured for mechanical strength

ISO 13628-6:2000

umbilical flexible hose consisting of a group of electrical cables, optical fibre cables, hoses, pipes, either on their own or with combinations of each other, cabled together for flexibility and oversheathed and/or armoured for mechanical strength, used to transmit fluid/electrical signals to and from a power source to a remote station

ISO 13628-7:2005

umbilical clamp clamp used to attach the umbilical(s) to the riser joints ISO 13628-7:2005umbilical joint means of joining together two lengths of umbilical to

effect a repair or to achieve the required production length

ISO 13628-5:2002

umbilical jumper short segment of umbilical with a termination plate at either end (incorporating connectors for the various lines) used to connect subsea facilities togetherNOTE An umbilical jumper is commonly used to connect e.g. a subsea umbilical termination to a subsea umbilical distribution unit.

ISO 13628-1:2005

umbilical system umbilical, complete with end terminations and other ancillary equipment, installed between a fixed platform, a floating production facility or a land-based station, and a fixed platform, a floating production system or a subsea system, providing control, data communication and transportation of production system service fluids and/or utility supplies

ISO 13628-5:2002

umbilical, noun group of electric cables, optical fibre cables, hoses, tubes, either on their own or in combination with each other, cabled together for flexibility and oversheathed and/or armoured for mechanical strength

ISO 13628-5:2002

umbilicals hose, tubing, piping, and/or electrical conductors which direct fluids and/or electrical current or signals to or from subsea treesNOTE Umbilical lines are typically used for control, monitoring, and/or injection functions.

ISO 13628-4:1999

unaged representative sample

sample of umbilical, or its internal components, which has not previously been subjected to loadings, stresses and/or elevated temperatureEXAMPLES Electric cables, hoses, tubes and optical fibres.

ISO 13628-5:2002

unbonded pipe pipe construction consists of separate unbonded polymeric ISO 13628-10:2005


and metallic layers, which allows relative movement between layers

unbonded pipe construction consisting of separate unbonded polymeric and metallic layers, which allows relative movement between layers

ISO 13628-2:2000

underflow centrifugal separator discharge stream from a centrifugal separator that contains a higher percentage of solids than does the feed

ISO 13501:2005

underflow screen separator discharge stream from a screen separator that contains a lower percentage of solids than does the feed

ISO 13501:2005

underpressure in a process component, pressure which is less than the design collapse pressure

ISO 10418:2003

underwater safety valveUSV

automatic valve assembly (installed at an underwater wellhead location) which will close upon loss of power supplyNOTE Where used in this International Standard, the term is understood to include a USV valve and USV actuator.[ISO 10423]

ISO 10417:2004


automatically operated wellhead valve assembly, installed at an underwater wellhead location, which will isolate the reservoir fluids upon loss of the power medium

ISO 10418:2003


automatic valve assembly (installed at an underwater wellhead location) which will close upon loss of power supplyNOTE Where used in this International Standard, the term is understood to include a USV valve and USV actuator.

ISO 10423:2003


safety valve assembly that is declared to be the USV as defined in API RP 14H and will close upon loss of hydraulic pressure

ISO 13628-6:2000

undesirable event adverse occurrence or situation in a process component or process station which poses a threat to safetyEXAMPLES Overpressure, underpressure, liquid overflow.

ISO 10418:2003

undrained condition condition whereby the applied stresses and stress changes are supported by both the soil skeleton and the pore fluid and do not cause a change in volume

ISO 19901-4:2003

undrained shear strength

maximum shear stress at yielding or at a specified maximum strain in an undrained conditionNOTE Yielding is the condition of a material in which a large plastic strain occurs at little or no stress increase.

ISO 19901-4:2003

uni-directional valve valve designed for blocking the flow in one direction only ISO 14313:1999uni-directional valve valve designed for blocking the flow in one direction only

[ISO 14313:1999]ISO 14723:2001

unit responsibility responsibility for coordinating the technical aspects of the equipment and all auxiliary systems included in the scope of the orderNOTE The technical aspects to be considered include, but are not limited to, such factors as the power requirements, speed, rotation, general arrangement, couplings, dynamics, noise, lubricant selection, instrumentation, piping, testing of components, conformance to specifications and material test reports.

ISO 10437:2003

unit responsibility responsibility for coordinating the technical aspects of the equipment and all auxiliary systems included in the scope of the orderNOTE Responsibility for such factors as the power requirements, speed, rotation, general arrangement, couplings, dynamics, noise, lubrication, sealing system, material test reports, instrumentation, piping and testing of components is included.

ISO 10438-1:2003

unit responsibility responsibility for coordinating the technical aspects of the equipment train and all auxiliary systems

ISO 10439:2002


unit responsibility responsibility for coordinating the technical aspects of the complete machine train and the associated auxiliary systemsNOTE 1 The technical aspects to be considered include, but are not limited to, such factors as the power requirements, speed, rotation, general arrangement, couplings and coupling guards, dynamics, noise, lubrication, sealing system, instrumentation, piping, conformance to specifications and testing of components.NOTE 2 Unit responsibility will normally reside with the vendor of the driven machine.

ISO 10441:1999

unit responsibility responsibility for coordinating the technical aspects of the equipment and all auxiliary systems included in the scope of the orderNOTE Responsibility for such factors as the power requirements, speed, rotation, general arrangement, couplings, dynamics, noise, lubrication, sealing system, material test reports, instrumentation, piping, and testing of components is included.

ISO 13691:2001

unit responsibility responsibility for co-ordinating the technical aspects of the equipment and all auxiliary systems included in the scope of the orderNOTE It includes responsibility for reviewing such factors as the power requirements, speed, rotation, general arrangement, couplings, dynamics, noise, lubrication, sealing system, material test reports, instrumentation, piping and testing of components.

ISO 13707:2000

unit responsibility responsibility for coordinating the documentation, delivery and technical aspects of the equipment and all auxiliary systems included in the scope of the orderNOTE The technical aspects to be considered include but are not limited to such factors as the power requirements, speed, rotation, general arrangement, couplings, dynamics, lubrication, sealing system, material test reports, instrumentation, piping, conformance to specifications and testing of components.

ISO 13709:2003

unit responsibility responsibility for coordinating the delivery and technical aspects of the equipment and all auxiliary systems included in the scope of the orderNOTE The technical aspects to be considered include but are not limited to such factors as the power requirements, speed, rotation, general arrangement, couplings, dynamics, noise, lubrication, sealing system, material test reports, instrumentation, piping, conformance to specifications and testing of components.

ISO 13710:2004

unit responsibility responsibility for coordinating the technical aspects of the complete machine train and the associated auxiliary systemsNOTE 1 The technical aspects to be considered include, but are not limited to, such factors as the power requirements, speed, rotation, general arrangement, couplings and coupling guards, dynamics, noise, lubrication, sealing system, instrumentation, piping, conformance to specifications and testing of components. NOTE 2 Unit responsibility normally resides with the vendor of the driven machine.

ISO 14691:1999

unoccluded unobstructed area of a screen opening ISO 13501:2005unweighted drilling fluid

drilling fluid that does not contain commercial suspended solids added for the purpose of increasing the density of the drilling fluid

ISO 13501:2005

upper critical temperature

Ar3temperature at which austenite begins to transform to ferrite during cooling

ISO 11960:2004

upper kelly valvekelly cock

valve immediately above the kelly that can be closed to confine pressures inside the drill stem

ISO 10424-1:2004

upset, noun forged metal end of OCTG with increased wall thickness and diameter, later to be threaded or welded

ISO 15463:2003


upstream direction of movement to the reservoir ISO 13628-4:1999upstream direction towards the source of pressure or flow ISO 13628-6:2000user manufacturer, service company, end user or operator applying

the testing of this part of ISO 13503ISO 13503-3:2005

user individual or company that uses equipment or material, or implements standards

ISO 13534:2000

user and/or operator organization that uses and/or operates the C/WO riser system ISO 13628-7:2005user/purchaser company, organization or entity that purchases, installs and/or

uses side-pocket mandrel productsISO 17078-1:2004

utility umbilical umbilical for the provision of electric/hydraulic power, process fluids and data communications installed between two fixed platforms, between a fixed platform and a floating facility, or between a fixed platform/floating facility and a land-based station

ISO 13628-5:2002

utilization factoru

fraction of the anodic material that can be used in the cathodic protection process

ISO 15589-2:2004

vacuum in a process component, pressure less than atmospheric pressure

ISO 10418:2003

validation test test performed to qualify a particular size, type and model of equipment for a specific class of serviceNOTE See Annex B for details.

ISO 10432:2004

valve block integral block containing two or more valves ISO 13628-4:1999valve-bore sealing mechanism

internal valve parts which close off the flow through the valve boreEXAMPLES Gates, balls, plugs, poppets, flappers and their respective seats.

ISO 10423:2003

valve-removal plug threaded plug which can be installed in the wellhead to enable gate valve removal under pressure

ISO 10423:2003

vanish point location where the external thread runs out or terminates on the OCTG outside surfaceNOTE The vanish point is the point where the lead of the chaser tool makes its final cut.

ISO 15463:2003

vapour barrier metallic foil placed between layers of refractory as a barrier to flue gas flow

ISO 13705:2001

variable-bore ramVBR

closing and sealing component in a ram blowout preventer that is capable of sealing on a range of tubular sizes

ISO 13533:2001

variant component with a unique combination of nominal diameter, type and pressure rating

ISO 14692-1:2002

vendorsupplier

agency that supplies the equipment in response to the orderNOTE The vendor may be the manufacturer of the equipment or the manufacturer’s agent and is normally responsible for service support.

ISO 10437:2003

vendor agency that manufactures, sells and provides service support for the equipment

ISO 10438-1:2003

vendor body that supplies the coupling in reponse to an order from the purchaserNOTE The vendor may be the manufacturer of the coupling or the manufacturer’s agent and is normally responsible for service support.

ISO 10441:1999

vendor organization that supplies the equipmentNOTE The vendor may be the manufacturer of the equipment or the manufacturer´s agent and is normally responsible for service support.

ISO 13691:2001

vendor organization that supplies the equipmentNOTE The vendor may be the manufacturer or the manufacturer’s agent and is normally responsible for service support.

ISO 13707:2000

vendorsupplier

manufacturer or manufacturer’s agent that supplies the equipment and is normally responsible for service support

ISO 13709:2003

vendorsupplier

manufacturer or manufacturer's agent that is contractually responsible for the supply of the equipment

ISO 13710:2004


vendor body that supplies the coupling in reponse to an order from the purchaserNOTE The vendor may be the manufacturer of the coupling or the manufacturer’s agent and is normally responsible for service support.

ISO 14691:1999

vendorsupplier

manufacturer of the equipment, or his agent, normally responsible for service supportNOTE This International Standard addresses the responsibilities between two parties, defined as the purchaser and the vendor or the supplier. There are many parties that are involved in the purchase and manufacture of the equipment.These parties are given different titles depending on their order in the chain. They may be called buyer, contractor, manufacturer or subvendor. For example, the party supplying a lubricating oil console may be the console vendor of the compressor manufacturer, the subvendor of the purchaser, and the purchaser of components within the console. All of these terms, however, can be reduced to the purchaser and vendor or supplier. It is for this reason that only these two terms are defined. Attempts to define these other terms would only cause confusion.

ISO 21049:2004

vent gas seal gas leakage which is taken away by the vent system ISO 10438-1:2003vent system arrangement of piping and valves used to take gas to a safe

locationISO 10438-1:2003

venturi plug valve valve with a substantially reduced opening through the plug and a smooth transition from each full-opening end to the reduced opening

ISO 14313:1999

Venturi valve valve with a reduced opening, in which the transformation from the full-opening ends to the reduced-closure area is well streamlined to reduce pressure loss

ISO 10423:2003

verification examination to confirm that an activity, a product or a service is in accordance with specified requirements

ISO 13628-7:2005

verification examination made to confirm that an activity, product, or service is in accordance with specified requirements

ISO 19901-7:2005

vernier calliperdial calliper

measuring device, usually with two legs or jaws, that can be adjusted to measure the thickness, diameter, and distance between surfacesNOTE Vernier callipers have a vernier scale readout whereas dial callipers have a dial readout.

ISO 15463:2003

vertical in-line pump vertical-axis pump whose suction and discharge connections have a common centreline that intersects the shaft axisNOTE The pump’s driver is generally mounted directly on the pump.

ISO 13709:2003

vertical tree subsea tree with either multiple or concentric bores and production valves located in the vertical bore of the tree, where the tubing hanger is installed before the tree

ISO 13628-7:2005

vertically suspended pump

vertical-axis pump whose liquid end is suspended from a column and mounting plateNOTE The pump’s liquid end is usually submerged in the pumped liquid.

ISO 13709:2003

vessel mean offset offset created by steady forces from current, wind and waves ISO 13628-7:2005vessel offset total offset of the vessel, taking into account the vessel mean

offset, wave frequency motions and low-frequency wind and wave motions

ISO 13628-7:2005

Vickers hardnessHV

hardness value, measured in accordance with ISO 6507-1, obtained using a diamond pyramid indenter and one of a variety of possible applied loads

ISO 15156-2:2003

vinyl ester class of thermosetting resin containing esters of acrylic and/or methacrylic acids, many of which have been made from epoxy resinNOTE Cure is accomplished, as with unsaturated polyesters, by

ISO 14692-1:2002


copolymerization with other vinyl monomers such as styrene.virgin materialvirgin stock

new and unused material as supplied by the material manufacturerNOTE Virgin material or virgin stock does not comprise or contain regranulated, recycled, reprocessed, reused or other similar material.

ISO 13628-5:2002

viscoelastic fluid crosslinked polymer solution or other fluid that exhibits significant elasticity, leading to the Weissenberg effect (bob climbing)

ISO 13503-1:2003

viscosity ratio of shear stress to shear rateNOTE 1 In the SI system, viscosity is expressed in pascal seconds (Pas).NOTE 2 If the shear stress is expressed in the CGS system (dynes per square centimetre) and the shear rate is expressed in reciprocal seconds, the viscosity is expressed in poise, P. 1 P 1 dyn·s/cm2 1 gcm1s1 101 Pas.

ISO 13501:2005

viscosity measure of the internal friction of a fluid when caused to flow by an external force

ISO 13503-1:2003

visual examination examination of parts and equipment for visible defects in material and workmanship

ISO 10423:2003


ISO 13533:2001


ISO 13628-10:2005


ISO 13628-2:2000

volatile hazardous air pollutantVHAP

any compound as defined by Title 1, Part A, Section 112 of the U.S. National Emission Standards for Hazardous Air Pollutants (NESHAPs) (Clean Air Act Amendment)

ISO 21049:2004

volume of solids drilled volume of solids drilled over a specified interval ISO 13501:2005volumetric efficiency ratio of the pump rated flow to the total piston or plunger

displacements per unit timeNOTE Volumetric efficiency is normally expressed as a percentage.

ISO 13710:2004

volumetric heat release heat released divided by the net volume of the radiant section, excluding the coils and refractory dividing walls

ISO 13705:2001

volumetric non-destructive examinationvolumetric NDE

examination for internal material defects by methods such as radiography and/or ultrasonic testing

ISO 10423:2003

volumetric non-destructive examination

examination for internal material defects by radiography, acoustic emission or ultrasonic testing

ISO 13533:2001

vortex cylindrical or conical shaped core of air or vapour lying along the central axis of the rotating slurry inside a hydrocyclone

ISO 13501:2005

vortex-induced vibration

in-line and transverse oscillation of a riser caused by current-induced periodic shedding of vortices

ISO 13628-7:2005

vulcanization process of cross-linking the elastomer chains to reduce the plasticity of the elastomerNOTE Otherwise referred to as “curing”.

ISO 13628-10:2005

wall thinning amount of reduction from the original wall thickness of the pipe to the wall thickness in the extrados after bending

ISO 15590-1:2001

water depth vertical distance between the sea floor and still water levelNOTE 1 As there are several options for the still water level (see 3.35), there can be several water depth values. Generally, design water depth is determined to LAT or to mean sea level.NOTE 2 The water depth used for calculating wave kinematics varies between the maximum water depth of the highest astronomical tide plus a positive storm surge, and the minimum water depth of the lowest astronomical tide less a negative storm surge, where

ISO 19901-1:2005


applicable. The same maximum and minimum water depths are applicable to bottom founded and floating structures, although water depth is usually a much less important parameter for floating structures. Water depth is, however, important for the design and analysis of the mooring system and risers for floating structures.

water hammer shock load or high-pressure surge caused by sudden halting of flow in a pipe

ISO 14692-1:2002

water-based drilling fluid

drilling fluid in which water is the suspending medium for solids and is the continuous phase, whether oil is present or not

ISO 13501:2005

water-wetting capability capability of a fluid to alter the quality or state of being water-wettedNOTE A fully water-wet state is considered most desirable to provide cement bonding.

ISO 10426-2:2003

water-wetting capability capability of a fluid to alter the quality or state of being water-wettedNOTE A fully water-wet state is considered most desirable to provide cement bonding.

ISO 10426-2:2003/Amd.1:2005

wave frequency motion motion of the vessel at the frequencies of incident waves ISO 13628-7:2005wave scatter diagram table listing occurrence of sea-states in terms of significant

wave height and wave peak period or mean upcrossing periodISO 13628-7:2005

wave spectrum measure of the amount of energy associated with the fluctuation of the sea surface elevation per unit frequency band and per unit directional sectorNOTE 1 The wave frequency spectrum (integrated over all directions) is often described by use of some parametric form such as the Pierson-Moskowitz or JONSWAP wave spectrum.NOTE 2 The area under the wave spectrum is the zeroth spectral moment m0, which is a measure of the total energy in the sea state; m0 is used in contemporary definitions of the significant wave height.

ISO 19901-1:2005

wave steepness characteristic of individual waves calculated as wave height divided by wave lengthNOTE For periodic waves, the concept is straightforward as H / . For random waves, the definition is used with the significant wave height (Hs) and the wave length that corresponds with the peak period (Tp) of the wave spectrum in deep water. The significant wave steepness is then defined as Hs / p = Hs / [(g/2 Tp2] and is typically in the range of 1/16 to 1/20 for severe sea states.

ISO 19901-1:2005

weak link device which is used to ensure that the umbilical parts or severs at a specified load and location

ISO 13628-5:2002

wear bushing retrievable cylindrical device which protects the internal surfaces of wellhead equipment and the top of the last casing suspended

ISO 10423:2003

wear bushing bushing to be installed in the rotary table, to provide a smooth lateral support to the workover riser at drill floor level

ISO 13628-7:2005

wear bushings bore protector which also protects the casing hanger below it ISO 13628-4:1999weathervaning process by which a floating structure passively varies its

heading in response to time-varying environmental actionsISO 19901-7:2005

weigh batch mixerscale tank

device or system for the weighing and blending of cement with dry additives

ISO 10426-2:2003

weight allowance quantified weight addition accounting for definable components which could not be specified at the actual project stageNOTE Weight allowance is expressed either as a percentage or as a lump sum.

ISO 19901-5:2003

weight contingency weight addition, based on risk analysis or experience, used to transform a base weight estimate to a 50/50 weight estimate accounting for uncertainties and/or definable components

ISO 19901-5:2003


which could not be specified at the actual project stageNOTE Weight contingency is expressed either as a percentage or as a lump sum.

weight installation code computer code which verifies whether a component or a weight item is physically installed or not in an assembly or module

ISO 19901-5:2003

weight item defined collection of bulk and/or equipment, design volume or assembly suitable for weight reporting purposes

ISO 19901-5:2003

weight management all planned and controlled activities which deal with thedefinition and publication of the project weight objective and policy,identification of, information about and evaluation of alternative design solutions,selection and implementation of an optimal design with respect to weight, CoG, volume, functionality, cost and progress.NOTE The project management, the engineering disciplines and the weight control discipline are actively cooperating and taking part in and influencing the weight management process by means of adequate working methods and tools, to include weight optimization, weight consciousness and weight reductions.

ISO 19901-5:2003

weight objective defined set of engineering goals necessary to fulfil the project contractual weight/CoG requirements and intentions in order to contribute to the correct design quality as defined by the management

ISO 19901-5:2003

weight phase code computer code defining in which loading conditions a component or a weight item is present

ISO 19901-5:2003

weight policy statement by the project management based on the weight objective and how it will be achievedNOTE The statement should as a minimum describethe weight objective's importance to the project aims and results,the priority, profile and control at different levels in the project,a philosophy for responsibility and authority within and between project groups engaged in weight/CoG matters.

ISO 19901-5:2003

weight reporting adequate and timely weight/CoG information reported with respect to content and presentation in order to fulfil expectations and requirements from/needs of organizations involved in the project

ISO 19901-5:2003

weight status code computer code related to the weight item level of accuracy ISO 19901-5:2003weighted drilling fluid drilling fluid to which high specific-gravity solids have been

added to increase its densityISO 13501:2005

weighting material high specific-gravity solids used to increase the density of drilling fluidsNOTE This material is commonly barite or haematite, and in special applications may be limestone

ISO 13501:2005

weld groove area between two metals to be joined that has been prepared to receive weld-filler metal

ISO 10423:2003

weld groove area between two metals to be joined that has been prepared to receive weld filler metal

ISO 13533:2001

weld joint fitting together of components in order to facilitate joining by welding

ISO 10423:2003

weld joint fitting together of components in order to facilitate their joining by welding

ISO 13533:2001

weld metal that portion of a weldment that has been molten during welding

ISO 15156-2:2003

weld repair process of correcting a defect that is discovered after the weld has been completed and submitted for inspection

ISO 13847:2000


NOTE The repair may involve complete removal of a cylinder of pipe or removal of a localized area by grinding or other means followed by additional welding.

weld, verb act of fusing materials, with or without the addition of filler materials

ISO 13533:2001

weld, verb join two or more pieces of metal by applying heat and/or pressure with or without filler metal, to produce a union through localized fusion of the substrates and solidification across the interfaces

ISO 15156-1:2001

welded plate pack plate pack where the gaskets have been replaced by welds ISO 15547-1:2005welder person who holds and manipulates the electrode holder,

welding gun, torch or blowpipe by hand [ISO 9606-1:1994/Amd.1:1998]

ISO 13847:2000

welding fusion of materials, with or without the addition of filler materials

ISO 10423:2003

welding neck flange flange with a neck on the side opposite the sealing face prepared with a bevel to weld to corresponding pipe or transition pieces

ISO 10423:2003

welding operator person who performs mechanized and/or automatic welding[ISO 14732:1998]

ISO 13847:2000

welding procedure specific course of action to be followed in making a weld, including reference to materials, preparation, preheating (if necessary), method and control of welding and post-weld heat treatment (if necessary) and equipment to be used[ISO 9956-1:1995]

ISO 13847:2000

welding procedure specificationWPS

document providing the required variables for a specific welding procedure

ISO 13847:2000

Welding process 3.2.1.1 Without filler metal(a) continuous welding: Process of forming a seam by heating the strip in a furnace and mechanicallypressing the formed edges together, wherein successive coils of strip had been joined together toprovide a continuous flow of steel for the welding mill. (This process is a type of butt-welding.)(b) electric-welding: Process of forming a seam by electric-resistance or electric-induction weldingwherein the edges to be welded are mechanically pressed together and the heat for welding isgenerated by the resistance to flow of electric current.3.2.1.2 With filler metal(a) submerged arc-welding: Welding process that produces coalescence of metals by heating them withan arc or arcs between bare metal consumable electrode or electrodes and the work. The arc andmolten metal are shielded by a blanket of granular, fusible material on the work. Pressure is not used,and part or all of the filler metal is obtained from the electrode(s).(b) gas metal arc-welding: Welding process that produces coalescence of metals by heating them withan arc or arcs between a continuous consumable electrode and the work. Shielding is obtainedentirely from an externally supplied gas or gas mixture. Pressure is not used, and the filler metal isobtained from the electrode.

ISO 3183-1:1996


weldment that portion of a component on which welding has been performed, including the weld metal, the heat-affected zone (HAZ), and the adjacent parent metal

ISO 15156-2:2003

well completion well operations including tubing installation, well perforation and test production

ISO 13628-7:2005

well simulation test test whose parameters are designed and modified as required to simulate the conditions found in a wellbore

ISO 10426-2:2003

well test rate stabilized rate at which the well is produced on a routine basis ISO 10417:2004wellhead all permanent equipment between the uppermost portion of

the surface casing and the tubing head adapter connectionISO 10423:2003

wellhead housing pressure boundary

wellhead housing from the top of the wellhead to where the lowermost seal assembly seals

ISO 13628-4:1999

wellhead pressure maximum shut-in surface pressure that may exist in a well ISO 13703:2000wet critical speed rotor critical speed calculated considering the additional

support and damping produced by the action of the pumped liquid within internal running clearances at the operating conditions and allowing for flexibility and damping within the bearings

ISO 13709:2003

wetted surface any surface which has contact with pressurized well fluid, either by design or because of internal seal leakage

ISO 10423:2003

wetting agent substance which lowers the surface tension of a liquid ISO 15463:2003wheel lower speed gear element in mesh ISO 13691:2001white cast iron cast iron that displays a white fracture surface due to the

presence of cementiteISO 15156-2:2003

wind spectrum measure of the variance associated with the fluctuating wind speed per unit frequency bandNOTE 1 The wind spectrum is an expression of the dynamic properties of the wind (turbulence). It reflects the fluctuations about and in the same direction as a certain mean wind speed, usually the 1 h sustained wind speed. There is hence no direction variable associated with the wind spectrum within this document.NOTE 2 As the sustained wind speed varies with elevation, the wind spectrum is a function of elevation.

ISO 19901-1:2005

winding angle angle of main reinforcement to pipe axial axisNOTE The angle can be either positive or negative.

ISO 14692-1:2002

wing valve valve located on the christmas tree, but not in the vertical run, which can be used to shut off well flow

ISO 10423:2003

wireline one type of equipment and associated technique(s) used to perform various operations in a well using a continuous length of solid line (slick line) or stranded wire, appropriate spooling equipment at the surface and weight stem and specialized tools attached to the well (downhole) end of the wire

ISO 17078-1:2004

wireline/coiled tubing BOPWCT-BOP

subsea BOP that attaches to the top of a subsea tree to facilitate wireline or coiled tubing interventionNOTE WCT-BOP rams are designed to shear wireline or coiled tubing and seal the bore, in one operation.

ISO 13628-7:2005

witness point point in the chain of activities, defined in the quality or inspection plan agreed upon, to be witnessed by theconformity assessment body if deemed necessary

ISO/TR 13881:2000

witnessed inspection or test that the purchaser attendsNOTE A hold is applied to the production schedule and the inspection or test is carried out with the purchaser or purchaser's representative in attendance

ISO 10437:2003

witnessed type of inspection or test for which the purchaser is notified of the timing of the inspection or test and a hold is placed on the inspection or test until the purchaser or his representative is in attendance

ISO 13709:2003


witnessed inspectionwitnessed test

inspection or test for which the purchaser is notified of the timing and a hold is placed on production until the purchaser or his representative is in attendance

ISO 21049:2004

witnessed inspection [test]

inspection [test] for which the purchaser is notified of the timing of the inspection [test] and a hold is placed on the inspection [test] until the purchaser or his representative is in attendance

ISO 13710:2004

work all activities to be performed within relevant contract(s) issued by designer, owner, operator, contractor, fabricator or manufacturer

ISO 13628-7:2005

working pressure pressure to which a particular piece of equipment is subjected during normal operation

ISO 10424-1:2004

working pressure SSSV internal pressure rating, including the differential rating with the valve closed

ISO 10432:2004

working temperature temperature to which a particular piece of equipment is subjected during normal operation

ISO 10424-1:2004

workover riser equipment to provide a conduit from the tree upper connection to the surface and allows the passage of wireline tools.NOTE It has to resist environmental wind, wave and current forces.

ISO 13628-4:1999

workover riser jointed riser that provides a conduit from the subsea tree upper connection to the surface and allows for the passage of tools during workover operations of limited duration, and can be retrieved in severe environmental conditionsNOTE Historically, workover operations have normally been performed in open sea (i.e. for vertical tree systems), but can be performed inside a drilling riser, provided sufficient barrier elements are available.

ISO 13628-7:2005

woven rovingWR

cloth reinforcement structure in which fibre bundle tows are woven together in a single plane to provide reinforcement which is usually orientated to provide strength in the orthogonal 0° and 90° directions

ISO 14692-1:2002

wrought metal metal in the solid condition that is formed to a desired shape by working (rolling, extruding, forging, etc.), usually at an elevated temperature

ISO 15156-2:2003

wrought products products shaped by means of forging or hot isostatic pressing ISO 10423:2003wrought structure structure that contains no cast dendritic elements ISO 10423:2003wrought structure structure that contains no cast dendritic structure ISO 13533:2001wye spool piping section of a subsea tree where the loop joins the

vertical tubing boreISO 13628-3:2000

wye spool spool between the master and swab (crown) valves of a TFL tree, that allows the passage of TFL tools from the flowlines into the bores of the tree

ISO 13628-4:1999

yield strength stress level, measured at room temperature, at which material plastically deforms and will not return to its original dimensions when the load is releasedNOTE All yield strengths specified in this International Standard are the 0,2 % yield offset strength in accordance with ASTM A 370.

ISO 10423:2003

yield strength stress level, measured at room temperature, at which material plastically deforms and will not return to its original dimensions when the stress is releasedNOTE 1 It is expressed in newtons per square millimetre (pounds per square inch) of loaded area.NOTE 2 All yield strengths specified in this International Standard are considered as being the 0,2 % yield offset strength in accordance with ISO 6892.

ISO 13533:2001

yield strength yield strength in this standard for steel materials is defined as 0,2 % yield offset strength, as specified in ISO 6892

ISO 13628-10:2005


NOTE For the purposes of this provision, ASTM A370 is equivalent to ISO 6892.

yield strength engineering stress at which, by convention, it is considered that plastic elongation has commencedNOTE It is specified in terms of either a specified deviation from a linear stress-strain relationship, or a specified total extension attained, or maximum or minimum engineering stresses measured during discontinuous yielding.

ISO 13628-2:2000

yield strength stress at which a material exhibits a specified deviation from the proportionality of stress to strainNOTE The deviation is expressed in terms of strain by either the offset method (usually at a strain of 0,2 %) or the totalextension-under-load method (usually at a strain of 0,5 %).

ISO 15156-1:2001

yield strength stress level measured at a specific test temperature beyond which the material plastically deforms and will not return to its original dimensionsNOTE The yield strength is expressed in units of force per unit area.

ISO 17078-1:2004

yoke U-shaped piece of soft magnetic material, either solid or laminated, around which a coil is wound to carry a magnetizing current

ISO 15463:2003

zone <area classification> distance in any direction from the source of release to the point where the flammable atmosphere has been diluted by air to a sufficiently low levelNOTE Different zone ratings are possible depending on the frequency that flammable mixtures are expected to be present.

ISO 13702:1999


Documents

3 · Web viewNOTE Other constituents present, such as oxygen (O2), may contribute to such chloride stress-corrosion cracking. ISO 13703:2000 chock block or wedge used beneath a length