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BRITISH STANDARD BS EN14382:2005

Safety devices for gaspressure regulating

stations and

installations Gas

safety shut-off devices

for inlet pressures up to

100 bar

ICS 23.060.40

+A1:2009

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BS EN 14382:2005

This British Standard waspublished under the authorityof the Standards Policy andStrategy Committeeon 23 February 2006

BSI 2009

ISBN978 0 580 67990 2

National foreword

This British Standard is the UK implementation of EN 14382:2005+A1:2009.It supersedes BS EN 14382:2005 which is withdrawn.

The UK participation in its preparation was entrusted to Technical CommitteeGSE/32, Gas governors.

A list of organizations represented on this committee can be obtained onrequest to its secretary.

Amendments/corrigendaissued since publication

+A1:2009

The start and finish of text introduced or altered by amendment is indicated

in the text by tags. Tags indicating changes to CEN text carry the number ofthe CEN amendment. For example, text altered by CEN amendment 1 isindicated by a b.

Date Comments

Implementation of CEN amendment A1:2009

This publication does not purport to include all the necessary provisions of acontract. Users are responsible for its correct application.

Compliance with a British Standard cannot confer immunity fromlegal obligations.

30 June2009

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Contents

page

Foreword .............................................................................................................................................................. 5

1 Scope ...................................................................................................................................................... 6

2 Normative references ............................................................................................................................ 7

3 Terms, definitions and symbols ........................................................................................................... 9

4 Construction requirements .................................................................................................................204.1 Basic requirements .............................................................................................................................204.1.1 General ..................................................................................................................................................20

4.1.2 Types of shut-off devices ...................................................................................................................214.1.3 End connections ..................................................................................................................................224.1.4 Flange ratings ......................................................................................................................................224.1.5 Nominal sizes and face-to-face dimensions .....................................................................................234.1.6 Sealing of the adjusting device ..........................................................................................................264.1.7 Set range...............................................................................................................................................264.1.8 External visual Indication of the position of the closing member ..................................................264.1.9 Springs ..................................................................................................................................................264.1.10 Parts transmitting actuating forces ...................................................................................................264.1.11 !Replaceable parts that may be affected by erosion or abrasion ..............................................264.2 Materials ...............................................................................................................................................264.2.1 Requirements for metallic materials ..................................................................................................264.2.2 Requirements for elastomers (including vulcanized rubber) .........................................................31

4.2.3 Requirements for non metallic materials different from those in 4.2.2 .........................................314.3 Strength of housings ...........................................................................................................................324.3.1 Body and its inner metallic partition walls"..................................................................................324.3.2 Flanges .................................................................................................................................................324.3.3 !Other pressure containing parts ..................................................................................................324.3.4 Inner metallic partition walls ..............................................................................................................344.3.5 Minimum values of safety factor ........................................................................................................344.3.6 Welded joint coefficient ......................................................................................................................35

5 Functional requirements .....................................................................................................................355.1 General ..................................................................................................................................................355.1.1 Shutting-off and opening ....................................................................................................................355.1.2 Mounting position ................................................................................................................................355.1.3 Bypass ..................................................................................................................................................355.1.4 Ice formation ........................................................................................................................................355.1.5 Fail-close conditions ...........................................................................................................................355.1.6 Pressure drop ......................................................................................................................................355.1.7 !Surveillance and maintenance ......................................................................................................365.2 Shell strength, external tightness and internal sealing ...................................................................365.2.1 Shell strength .......................................................................................................................................365.2.2 External tightness ................................................................................................................................365.2.3 Internal sealing ....................................................................................................................................365.3 Accuracy group ...................................................................................................................................375.4 Response time .....................................................................................................................................375.5 Relatching difference and unlatching ...............................................................................................375.5.1 Relatching difference ..........................................................................................................................37

5.5.2 Unlatching under mechanical impact ................................................................................................375.6 Closing force ........................................................................................................................................385.7 Endurance and accelerated ageing ...................................................................................................38

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5.8 Strength of the trip mechanism, valve seat and closing member against the dynamicimpact of flowing gas .......................................................................................................................... 38

5.9 Flow coefficient ................................................................................................................................... 395.10 Final visual inspection ........................................................................................................................ 39

6 Testing .................................................................................................................................................. 39

6.1 General ................................................................................................................................................. 396.2 Tests ..................................................................................................................................................... 396.3 Type test ............................................................................................................................................... 406.4 Selection of test samples ................................................................................................................... 416.5 Routine tests ........................................................................................................................................ 416.6 Production surveillance ...................................................................................................................... 41

7 Test and verification methods ........................................................................................................... 417.1 Dimensional check and visual inspection ........................................................................................ 417.2 Materials check .................................................................................................................................... 417.3 Verification of the strength of pressure containing parts and inner metallic partition walls ...... 427.3.1 Strength calculation method .............................................................................................................. 427.3.2 Experimental design method ............................................................................................................. 42

7.4 Verification of the strength of parts transmitting actuating forces ............................................... 437.5 Shell and inner metallic partition walls strength test ...................................................................... 437.6 Alternative shell and inner metallic walls strength test .................................................................. 447.7 External tightness test ........................................................................................................................ 447.7.1 External tightness test of metallic housing ...................................................................................... 447.7.2 External tightness test of chambers bounded on at least one side by a diaphragm ................... 457.8 Internal sealing test ............................................................................................................................. 467.9 Accuracy group ................................................................................................................................... 467.9.1 General conditions .............................................................................................................................. 467.9.2 Test at ambient temperature .............................................................................................................. 467.9.3 Test at the limit temperatures 20 C or 10 C and 60 C .............................................................. 477.9.4 !Verification of the upper limit of the highest set range for overpressure monitoring"...... 487.9.5 Determination of flow coefficient ....................................................................................................... 48

7.10 Response time ..................................................................................................................................... 507.11 Relatching difference and unlatching ............................................................................................... 517.11.1 !Trip pressure for over-pressure monitoring".......................................................................... 517.11.2 Lower trip pressure ............................................................................................................................. 517.12 Closing force ........................................................................................................................................ 527.13 Endurance and accelerated ageing ................................................................................................... 537.14 Resistance to gas of non metallic parts............................................................................................ 537.15 Verification of the strength of the trip mechanism, valve seat and closing member against

dynamic impact of flowing gas .......................................................................................................... 537.16 Final visual inspection ........................................................................................................................ 547.16.1 After type test ...................................................................................................................................... 547.16.2 After routine tests and production surveillance .............................................................................. 54

8 Documentation .................................................................................................................................... 548.1 Documentation related to type test ................................................................................................... 548.1.1 Documentation required prior to type test ....................................................................................... 548.1.2 Test report ............................................................................................................................................ 558.2 Documentation for the customer ....................................................................................................... 558.2.1 Sizing equation .................................................................................................................................... 558.2.2 Documentation provided at the request of the customer ............................................................... 558.2.3 Documentation provided with the shut-off device ........................................................................... 558.3 Documentation related to production surveillance in accordance with 6.6.................................. 568.3.1 Documentation to be available for production surveillance ........................................................... 568.3.2 Production surveillance report .......................................................................................................... 56

9 Marking ................................................................................................................................................. 569.1 General requirements ......................................................................................................................... 56

9.2 Marking of connections for sensing, exhaust and breather lines .................................................. 579.3 Identification of auxiliary devices ...................................................................................................... 57

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Annex A (informative) Ice formation ...............................................................................................................58A.1 General ..................................................................................................................................................58A.2 Requirements .......................................................................................................................................58A.3 Tests ......................................................................................................................................................58

Annex B (informative) Compliance evaluation ...............................................................................................59

B.1 General ..................................................................................................................................................59B.2 Introduction ..........................................................................................................................................59B.3 Procedure .............................................................................................................................................59B.4 Manufacturers compliance evaluation .............................................................................................60B.5 Issue of the certificate of compliance ...............................................................................................60

Annex C (informative) Pressure drop and flow coefficient ...........................................................................61C.1 Calculation method for pressure drop throughout the SSD ...........................................................61C.2 Test method for the determination of the flow coefficient Cv........................................................61

Annex D (informative) Alternative test method for verification of the strength of the tripmechanism, valve seat and closing member....................................................................................63

D.1 Test method..........................................................................................................................................63

D.2 Test method for the determination of the dynamic factorC

r..........................................................63D.3 Test method for a series of SSDs ......................................................................................................64

Annex E (informative) Sizing equation ............................................................................................................66

Annex F (informative) Inspection certificate ..................................................................................................67

Annex G (informative) Order specification .....................................................................................................69G.1 General ..................................................................................................................................................69G.2 Minimum specifications ......................................................................................................................69G.2.1 Details of construction ........................................................................................................................69G.2.2 Dimensions...........................................................................................................................................69G.2.3 Performance .........................................................................................................................................69G.3 Optional specifications .......................................................................................................................70

Annex H (informative) Acceptance test ..........................................................................................................71

Annex I (informative)!Seat leakage (alternative requirement)"............................................................72

Annex J (normative) Materials .........................................................................................................................73J.1 Steel materials for pressure containing parts and inner metallic partition walls .........................73J.2 Metallic materials different from steel materials for pressure containing parts and inner

metallic partition walls ........................................................................................................................79J.3 Materials for fixtures, integral process and sensing lines, connectors and fasteners ................84

Annex K (informative) !Suitability of safety shut-off device for damp operating conditions ...............87

Annex L (informative) Glossary .......................................................................................................................88

Annex ZA (informative) Relationship between this European Standard and the Essential

Requirements of EU Directive 97/23/EC ............................................................................................90Bibliography ......................................................................................................................................................92

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Foreword

This document (EN 14382:2005+A1:2009) has been prepared by Technical Committee CEN/TC 235 Gaspressure regulators and associated safety devices for use in gas transmission and distribution, the secretariatof which is held by UNI.

This European Standard shall be given the status of a national standard, either by publication of an identicaltext or by endorsement, at the latest by September 2009, and conflicting national standards shall bewithdrawn at the latest by September 2009.

This document includes Amendment 1, approved by CEN on 2009-01-12.

This document supersedes!EN 14382:2005".

The start and finish of text introduced or altered by amendment is indicated in the text by tags !".

This document has been prepared under a mandate given to CEN by the European Commission and theEuropean Free Trade Association, and supports essential requirements of EU Directive 97/23/EC.

For relationship with EU Directive 97/23/EC, see informative Annex ZA, which is an integral part of thisdocument.

Safety shut-off devices dealt with in this document are standard safety shut-off devices and, when used inpressure regulating stations complying with EN 12186 or EN 12279, they are considered as standard pressureequipment in accordance with Clause 3.1 of Art. 1 of Pressure Equipment Directive (PED).

For standard safety shut-off devices used in pressure regulating stations complying with EN 12186 orEN 12279, Table ZA.1 given in Annex ZA includes all applicable Essential Requirements given in Annex I ofPED!except the external corrosion resistance in case of environmental conditions where corrosion is likelyto occur".

The normative Annex J of this document lists some suitable materials for pressure containing parts, innermetallic partition walls, fasteners and connectors. Other materials may be used when complying with therestrictions given in Table 5.

!deleted text"

!Continued" integrity of safety shut-off devices is assured by periodic functional checks. For periodicfunctional checks it is common to refer to national regulations/standards where existing orusers/manufacturers practices.

According to the CEN/CENELEC Internal Regulations, the national standards organizations of the followingcountries are bound to implement this European Standard: Austria, Belgium, Bulgaria, Cyprus, CzechRepublic, Denmark, Estonia, Finland, France, Germany, Greece, Hungary, Iceland, Ireland, Italy, Latvia,Lithuania, Luxembourg, Malta, Netherlands, Norway, Poland, Portugal, Romania, Slovakia, Slovenia, Spain,Sweden, Switzerland and United Kingdom.

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1 Scope

!This document specifies constructional, functional, testing and marking requirements, sizing anddocumentation of gas safety shut-off devices used in the pressure regulating stations in accordance with

EN 12186 or EN 12279:"

for inlet pressures up to 100 bar and nominal diameters up to DN 400;

for an operating temperature range from 20 C to +60 C,

which operate with fuel gases of the 1st and 2nd family in accordance with EN 437 in transmission anddistribution networks and also in commercial and industrial installations.

"Gas safety shut-off devices" will hereafter be called "SSDs" except in titles.

!For standard safety shut-off devices when used in pressure regulating stations complying with EN 12186

or EN 12279, Annex ZA lists all applicable Essential Requirements except the external corrosion resistance incase of environmental conditions where corrosion is likely to occur."

!This document considers the following classes/types of SSDs:"

temperature classes:

class 1: operating temperature range from 10 C to 60 C;

class 2: operating temperature range from 20 C to 60 C;

functional classes:

!class A: SSDs that close when damage to the pressure detector element occurs (applicable tooverpressure SSDs only) or when external power fails and whose re-opening, after an intervention foroverpressure, is possible only manually;

class B: SSDs that do not close when damage to the pressure detector element occurs and whose re-opening, after an intervention for overpressure, is possible only manually;

SSDs types:

type IS: (integral strength type);

type DS: (differential strength type)."

SSDs complying with the requirements of this document may be declared as in conformity withEN 14382 and bear the mark EN 14382.

The material and functional requirements specified in this document may be applied to SSDs which usethermal energy or the effects of electrical energy to trip the operation of the closing member. For these SSDsthe operational parameters are not specified in this document.

This document does not apply to:

SSDs upstream from/on/in domestic gas-consuming appliances which are installed downstream ofdomestic gas meters;

!SSDs incorporated into pressure-regulating devices used in service lines with volumetric flow rate200 m

3/h at normal conditions and inlet pressure 5 bar."

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2 Normative references

The following referenced documents are indispensable for the application of this document. For datedreferences, only the edition cited applies. For undated references, the latest edition of the referenceddocument (including amendments) applies.

!deleted text"

!EN 287-1:1992,Approval testing of welders Fusion welding Part 1: Steel"

EN 334:2005, Gas pressure regulators for inlet pressures up to 100 bar

!EN 473:2000", Non destructive testing Qualification and certification of NDT personnel Generalprinciples

!deleted text"

!EN 970:1997", Non-destructive examination of fusion welds Visual examination

!deleted text"

!EN 1092-1:2007, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PNdesignated Part 1: Steel flanges

EN 1092-2:1999, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PNdesignated Part 2: Cast iron flanges

EN 1092-3:2005, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PNdesignated Part 3: Copper alloy flanges

EN 1092-4:2004, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, PNdesignated Part 4: Aluminium alloy flanges"

EN 1349, Industrial process control valves

!EN 1418:1997", Welding personnel Approval testing of welding operators for fusion welding andresistance weld setters for fully mechanized and automatic welding of metallic materials

!deleted text"

!EN 1759-1, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories,Class-designated Part 1: Steel flanges, NPS to 24

EN 1759-3, Flanges and their joints Circular flanges for pipes, valves, fittings and accessories, Classdesignated Part 3: Copper alloy flanges

EN 1759-4, Flanges and their joint Circular flanges for pipes, valves, fittings and accessories, classdesignated Part 4: Aluminium alloy flanges"

EN 10045-1, Metallic materials Charpy impact test Part 1: Test method

!EN 10204:2004", Metallic products Types of inspection documents

!EN 10226-1, Pipe threads where pressure tight joints are made on the threads Part 1: Taper externalthreads and parallel internal threadsDimensions, tolerances and designation

EN 10226-2, Pipe threads where pressure tight joints are made on the threads Part 2: Taper externalthreads and taper internal threads Dimensions, tolerances and designation"

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EN 12186, Gas supply systems Gas pressure regulating stations for transmission and distribution Functional requirements

EN 12279, Gas supply systems Gas pressure regulating installations on service lines Functionalrequirements

!EN 12516-1:2005, Industrial valves Shell design strength Part 1: Tabulation method for steel valveshells

EN 12516-2:2004, Industrial valves Shell design strength Part 2: Calculation method for steel valve shells

EN 12516-4:2008, Industrial valves Shell design strength Part 4: Calculation method for valve shells inmetallic materials other than steel"

!deleted text"

EN 12627, Industrial valves Butt welding ends for steel valves

EN 13445-4, Unfired pressure vessels Part 4: Fabrication

EN 13906-1, Cylindrical helical springs made from round wire and bar Calculation and design Part 1:Compression springs

EN 13906-2, Cylindrical helical springs made from round wire and bar Calculation and design Part 2:Extension springs

EN 60534-1:1993, Industrial-process control valves Part 1: Control valve terminology and generalconsiderations (IEC 60534-1:1987)

EN ISO 175:2000, Plastics Methods of test for the determination of the effects of immersion in liquidchemicals (ISO 175:1999)

!EN ISO 9606-2:2004, Qualification test of welders Fusion welding Part 2: Aluminium and aluminiumalloys (ISO 9606-2:2004)

EN ISO 9606-3:1999, Qualification test of welders Fusion welding Part 3: Copper and copper alloys(ISO 9606-3:1999)

EN ISO 9606-4:1999, Qualification test of welders Fusion welding Part 4: Nickel and nickel alloys(ISO 9606-4:1999)

EN ISO 15607:2003, Specification and qualification of welding procedures for metallic materials Generalrules (ISO 15607:2003)

EN ISO 15609-1:2004, Specification and qualification of welding procedures for metallic materials Weldingprocedure specification Part 1: Arc welding (ISO 15609-1:2004)

EN ISO 15610:2003, Specification and qualification of welding procedures for metallic materials Qualification based on tested welding consumables (ISO 15610:2003)

EN ISO 15611:2003, Specification and qualification of welding procedures for metallic materials Qualification based on previous welding experience (ISO 15611:2003)

EN ISO 15612:2004, Specification and qualification of welding procedures for metallic materials Qualification by adoption of a standard welding procedure (ISO 15612:2004)

EN ISO 15613:2004, Specification and qualification of welding procedures for metallic materials Qualification based on pre-production welding test (ISO 15613:2004)

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EN ISO 15614-1:2004, Specification and qualification of welding procedures for metallic materials Weldingprocedure test Part 1: Arc and gas welding of steels and arc welding of nickel and nickel alloys (ISO 15614-1:2004)

EN ISO 15614-2:2005, Specification and qualification of welding procedures for metallic materials Welding

procedure test Part 2: Arc welding of aluminium and its alloys (ISO 15614-2:2005)"

EN ISO/IEC 17025:2000, General requirements for the competence of testing and calibration laboratories(ISO/IEC 17025:1999)

ISO 7-1, Pipe threads where pressure tight joints are made on threads Part 1: Dimensions, tolerances anddesignation

ISO 1817, Rubber, vulcanized Determination of the effect of liquids

ISO 7005 (all parts), Metallic flanges

ANSI/ASME B1.20.1:1983, Pipe threads, general purpose (inch)

!deleted text"

MSS SP 55:1985, Quality standard for steel castings for valves, flanges and fittings and other pipingcomponents (Visual method)

3 Terms, definitions and symbols

!For the purposes of this document, the following terms, definitions and symbols apply.

NOTE Annex L list all definitions and terms in alphabetic order for English language, the relevant translation in

French and German language and the relevant sub clause of this clause."

3.1!General terms and definition of type of safety devices"

!deleted text"

3.1.1safety shut-off device

device whose function is to stay in the open position under normal operating conditions and to shut-off the gasflow automatically and completely when the monitored pressure exceeds the pre-set values!(over-pressuremonitoring and/or under-pressure monitoring)"

3.1.2

direct acting shut-off device!SSD in which the pressure detector element is directly connected to the trip mechanism (see Figure 1)"

3.1.3indirect acting shut-off deviceSSD in which the energy required to move the closing member or to operate the controller is supplied by aninternal or external power supply (see Figures 2 and 3)

3.1.4cut-off device

SSD designed to shut-off the gas flow, which responds slower dynamically than a slam shut device when themonitored pressure exceeds the pre-set values

EXAMPLE SSD using actuator driven by pipeline gas or external power

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3.1.5slam shut deviceSSD designed to quickly shut-off the gas flow when the monitored pressure exceeds the pre-set values

EXAMPLE Spring or weight loaded SSD

3.1.6sensing pointpoint from which the monitored variable is fed to the SSD

3.1.7SSD size!deleted text"

nominal size DN of the inlet connection in accordance with EN ISO 6708

!3.1.8series of safety shut-off devicesSSDs with the same design concept but differing only in size"

3.2!Terms and definition of components of safety devices"

3.2.1main componentsparts including normally: a controller, a trip mechanism, an actuator, a closing member and a relatching devicepermitting the manual opening of the SSD. All these parts are functionally connected (see Figures 1, 2 and 3)

3.2.1.1closing memberpart which shuts off the gas flow completely

3.2.1.2trip mechanismmechanism which releases the closing member when activated by the controller

3.2.1.3actuatordevice activated by the trip mechanism which shuts the closing member

3.2.1.4relatching devicedevice which enables the complete opening of the SSD

3.2.1.5

bodymain pressure containing envelope which provides the fluid flow passageway and the pipe end connections

3.2.1.6valve seatcorresponding sealing surfaces within an SSD which make full contact only when the closing member is in theclosed position

3.2.1.7seat ringpart assembled in a component of the SSD to provide a removable seat

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3.2.1.8controller

!device which includes:

a setting element to adjust the set value of the trip pressure;

a pressure detector element which has the function to detect the feedback of the monitored pressure (e.g.a diaphragm);

a unit which compares the set value of the trip pressure with the monitored pressure;

a system which gives the energy to operate the trip mechanism"

3.2.1.9bypassdevice permitting manual equalization of pressure across a closed SSD

3.2.2

fixturesdevices functionally connected to the main components of the SSD

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!

"

Key

1 Bypass 6 Controller2 Relatching device 7 Sensing line

3 Trip mechanism 8 Actuator

4 Breather line 9 Sensing point

5 Setting element 10 Closing member

!11 Scheme 1a"

Figure 1 Example of a direct acting safety shut-off device

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Key

1 Bypass 7 Sensing line

2 Actuator 8 External loading pressure line

3 Relatching device 9 Internal loading pressure line

4 Exhaust line 10 Breather/exhaust line5 Trip mechanism 11 Sensing point

6 Controller 12 Closing member

Figure 2 Example of an indirect acting shut-off device

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Key

1 Bypass 7 Sensing line

2 Actuator 8 External loading pressure line

3 Relatching device 9 Internal loading pressure line

4 Exhaust line 10 Breather/exhaust line

5 Trip mechanism 11 Sensing point

6 Controller 12 Closing member

13 Pressure reducer (is applicable)

Figure 3 Example of an indirect acting shut-off device

!deleted text"

3.2.3loading pressure lineline connecting the controller and/or actuator to the internal or external power source

3.2.4pressure containing parts

parts whose failure to function would result in a release of the retained fuel gas to the atmosphere

NOTE These include bodies, closing member, controllers, bonnets, blind flanges and pipes for process and sensinglines but exclude compression fittings, diaphragms, bolts and other fasteners.

3.2.5

inner metallic partition wallmetallic wall that separates a chamber into two individual pressure-containing chambers at different pressuresunder normal operating conditions

3.2.6sensing lineline connecting the sensing point and the controller

3.2.7exhaust line!line connecting the controller and/or actuator of the SSD to atmosphere for the safe exhausting of fuel gasin the event of failure of any part"

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3.2.8breather line

!line connecting the atmospheric side of the pressure detector element to atmosphere

NOTE In the event of a fault in the pressure detector element this line can become an exhaust line."

!deleted text"

3.3!Terms, symbols and definitions related to the functional performance"

3.3.1pressureall pressures specified in this standard are static gauge pressures

NOTE Pressure is expressed in bar1).

3.3.1.1differential pressure

pdifference between two values of pressure at two different points

3.3.1.2loading pressurepressure of the gas from the upstream pipeline or of the gas from an external source used as an energysource for the controller and/or actuator

!deleted text"

3.3.2.1monitored pressure

pressure monitored and safeguarded by the SSD, normally the outlet pressure of the pressure regulatingstation/installation

3.3.2.2disturbance variablesvariables affecting the functioning of the SSD

EXAMPLES

!changes in flow rate;"

temperature changes;

mechanical impacts;

influence of moisture;

influence of gas conditioning agents;

dust, condensation or other foreign material;

dynamic force on closing member created by gas flow

1)1 bar = 105Pascal = 1 000 mbar = 10-1

MPa = 105N/m

2.

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3.3.2.3trip pressure

!pdo (for over-pressure monitoring)

pdu(for under-pressure monitoring)

pressure value at which the closing member moves to closed position"

!deleted text"

3.3.3 Possible values of all variables

3.3.3.1actual value of the trip pressure!pdio(for over-pressure monitoring)

pdiu(for under-pressure monitoring)

pressure value at which the closing member of an SSD starts to move"

3.3.3.2

maximum valuehighest value, which is specified by the index max added to the symbol of the variable:

to which any variable can be adjusted or to which it is limited;

any variable may reach during a series of measurements, or during a certain time period

3.3.3.3minimum valuelowest value, which is specified by the index min added to the symbol of the variable:

to which any variable can be adjusted or to which it is limited;

any variable may reach during a series of measurements or during a certain time period

3.3.4 !Terms, symbols and definitions related to the set value of the trip pressure"

3.3.4.1set point!pdso(for over-pressure monitoring)

pdsu(for under-pressure monitoring)

nominal trip pressure value under specified conditions"

3.3.4.2set range

!Wdo (for over-pressure monitoring)

Wdu(for under-pressure monitoring)

whole range of set points which can be obtained with a SSD by adjustment and/or the replacement of somecomponents (e.g. replacement of the setting mean, or pressure detector element)"

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3.3.4.3specific set range

!Wdso(for over-pressure monitoring)

Wdsu(for under-pressure monitoring)

whole range of set points which can be obtained with a SSD by adjustment and without replacement of any

component"

3.3.5 !Terms, symbols and definitions related to the flow"

3.3.5.1normal conditionsabsolute pressure of 1,013 bar and temperature of 0 C (273,15 K).

NOTE For calculation purposes a value of 273 K is used in this document.

3.3.5.2gas volumevolume of gas at normal conditions

NOTE Gas volume isexpressed in m3.

3.3.5.3volumetric flow rateQvolume of gas which flows through the SSD per unit time, at normal conditions

NOTE Volumetric flow rate is expressed in m3/h.

!deleted text"

!3.3.6 Terms, symbols and definitions related to accuracy and some other performances"

3.3.6.1trip pressure deviation!difference between the actual value of the trip pressure and the set point as a percentage of the set value(see Figure 4)"

3.3.6.2accuracy group

AGmaximum permissible absolute value of trip pressure deviation (see Figure 4)

3.3.6.3

inlet operating pressure range!b

pu"

range of inlet operating pressure for which the SSD ensures a given accuracy group

3.3.6.4response timeta

time interval between attaining the permissible limit value of the trip pressure at the sensing point andcomplete closure of the closing member

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3.3.6.5relatching difference

pw

!minimum difference" between the set value of the trip pressure and the monitored pressure which isrequired for the correct resetting of the SSD

!

"

Key

1 Set value of trip pressure (pdso)

2 Actual value of trip pressure (dio)

3 Trip pressure deviation

4 Accuracy group (AG)

5 Relatching difference (pw)

Figure 4 Monitored pressure and trip pressure

!3.3.6.6pressure dropdrop in pressure, at specified operating conditions, of gas passing through the SSD body"

3.4!Terms, symbols and definitions related to the design and tests"

!deleted text"

!3.4.1component operating pressurepgas pressure occurring in any part of a SSD during operation"

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3.4.1.1maximum component operating pressurepmax

highest operating pressure at which a component of an SSD will continuously operate within specifiedconditions

!3.4.2inlet pressurepu

inlet pressure at which the SSD can continuously operate within specified conditions"

!deleted text"

3.4.2.1maximum inlet pressurepumax

highest inlet pressure at which the SSD can continuously operate within specified conditions

3.4.3maximum allowable pressurePS!maximum pressure for which the body, its inner metallic partition walls and some other pressure containingparts are designed in accordance with the strength requirements in this document"

!3.4.4specific maximum allowable pressurePSDpressure for which some pressure containing parts of differential strength SSDs are designed where

PSD

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3.4.8safety factor

!ratio of the limit pressure pl to the maximum allowable pressure PS or to specific maximum allowable

pressure PSD applied to:

SSD body: Sb (only PS);

other pressure containing part of the SSD: S(PS or PSD)"

3.4.9operating temperature rangetemperature range at which the SSD components and fixtures are capable of operating continuously

!deleted text"

!deleted text"

3.4.10closing forceFS

force created by a spring, by a weight-piece or by pressure to operate the closing member

!deleted text"

4 Construction requirements

4.1 Basic requirements

4.1.1 General

SSDs shall not have any continuous discharge of gas into the atmosphere, however, temporary dischargesfrom fixtures may occur.

!SSDs shall be so designed that external tightness and internal sealing meet the requirements of 5.2. If inthe event of failure (e.g. of a diaphragm) leakage to atmosphere is possible, the breather shall be provided

with, a threaded connection of at least DN 10 to enable an exhaust line to be connected2."

!Where there is the possibility of damage to external protrusions or other parts during transport andhandling, the manual shall describe precautions to be taken to prevent the risk."

The force required to operate the relatching device shall be:

250 N;

150 N when the relatching device needs more than 10 operations (e.g. for a cut-off device).

For cut-off devices the operating and maintenance manual shall specify whether a by-pass shall be providedand how this will be accomplished.

!deleted text"

2!For proper operation of the SSD any exhaust line should be designed in a such way to prevent the ingress of foreignmaterials."

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SSDs may be stand-alone devices or may be built into gas pressure regulators.

After relatching, all functional units shall have returned to their starting position without impeding the closingfunction and the SSD shall be ready for operation. The handle of the relatching device may be detachable.Devices to lock the relatching device in the open position are not permitted.

Where pipeline gas is utilized as a source of energy for indirect acting SSDs, the location on the pipeline ofthe loading pressure connection shall not affect the safety performance of the SSD. If applicable, thisinformation shall be given in the operating manual.

Pressure containing parts not intended to be dismantled during servicing, adjustment or conversion shall besealed by means which will show evidence of interference (e.g. lacquer).

!Pressure containing parts, including measuring and test points, which may be dismantled for servicing,adjustment or conversion, shall be made pressure tight by mechanical means (e.g. metal to metal joints, o-rings, gaskets). Jointing compounds, such as liquids and pastes, shall not be used."

Jointing compounds, however, may be used for permanent assemblies and shall remain effective under

normal operating conditions.

4.1.2 Types of shut-off devices

4.1.2.1 Stand-alone shut-off devices

SSDs may be designed as independent units for separate installation. A stand-alone SSD comprises all themain components!(see 3.2.1)".

4.1.2.2 Shut-off devices integrated into a gas pressure regulator

SSDs shall be functionally independent from the components of the regulator and from other safety devices.

!This requirement is met if the function of the SSD is not affected in the event of the failure and/or loss offunctionality of one or more of the following components of the regulator or other safety devices:"

control/closing/relieving member;

seat ring;

actuator;

actuator casing;

controller;

sensing and process lines.

4.1.2.3 !Safety shut-off device with in-line gas pressure regulator

The system includes a regulator with the function of active regulator and an in-line SSD (in series).

The SSD shall be installed directly upstream of the regulator and both devices shall control the pressure at thesame location.

The associated in-line regulator shall be functionally independent from the SSD.

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This requirement is met if:

a) the function of the regulator is not affected in the event of the failure and/or loss of functionality of one ormore of the following SSD components:

controller;

sensing and process lines;

and if:

b) the function of the SSD is not affected in the event of the failure and/or loss of functionality and/orfunctionality of one or more of the following regulator components:

pilot (in case of pilot-controlled regulator);

sensing and process lines.

The motorization energy for regulator in case of pilot-controlled type, shall be taken downstream from theSSD."

4.1.3 End connections

End connections may be one of the following:

flanged connections according to the applicable parts of ISO 7005 (some parts of these documents canbe replaced by the equivalent documents when they are available. At the time of writing, this subject isdealt with in EN 1092-1, EN 1092-2, EN 1092-3, EN 1092-4, EN 1759-1, EN 1759-3 and EN 1759-4);

flangeless type (e.g. wafer body);

!threaded connections in accordance with EN 10226-1 or EN 10226-2 for:

DN 50;

DN 80 and PS 16 bar;"

compression fittings for DN 50;

butt-weld connections in accordance with EN 12627.

4.1.4 Flange ratings

The PN ratings for flanges shall be selected from the following designations:

6 - 10 - 16 - 20 - 25 - 40 - 50 - 1103)

!according to the relevant parts of ISO 7005 (some parts of these documents can be replaced by theequivalent documents when they are available). Flange ratings shall be in accordance with EN 1092-1,EN 1092-2, EN 1092-3, EN 1092-4, EN 1759-1, EN 1759-3 and EN 1759-4".

The underlined designations are preferred.

3) The nominal pressure designations PN 20, PN 50 and PN 110 are equivalent to class ratings 150, 300 and 600respectively.

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4.1.5 Nominal sizes and face-to-face dimensions

SSDs with flange connections should have the same nominal size at the inlet and outlet.

The nominal sizes and face-to-face dimensions given in Table 1 are recommended.

Alternatively, the nominal sizes and face-to-face dimensions may be taken from Table 2.

Flangeless SSDs (SSDs that have no line flanges but are intended to be installed by clamping between pipeflanges) are permitted as an alternative. In this case SSDs should have the same nominal size at the inlet andoutlet and face-to-face dimensions should be taken from Tables 3 or 4.

The following SSDs are permitted:

flanged with different nominal inlet and outlet sizes;

those with face-to-face dimensions differing from those given in Tables 1 and 2.

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Table 1 Recommended face-to-face dimensions for flanged SSDs

Nominal size Nominal pressure Limit deviations forface-to-face

dimensions in mmPN 10/16/20a PN 25/40/50 PN 110

Face-to-face dimensions in mm

25 184 197 210

2

40 222 235 251

50 254 267 286

65 276 b 292b 311 b

80 298 317 337

100 352 368 394

150 451 473 508

200 543 568 610

250 673 708 752

300 737 775 819

3350 889 927 972

400 1 016 1 057 1 108

Source: Tables 1 and 2 of EN 60534-3-1:2000 (nominal pressure in accordance with the relevant parts ofISO 7005 some parts of these documents can be replaced by the equivalent documents when they areavailable. At the time of writing, this subject is dealt with in EN 1092-1, EN 1092-2, EN 1092-3, EN 1092-4,EN 1759-1, EN 1759-3 and EN 1759-4).

a In some countries the group PN 10/16/20 also includes PN 6.

b Face-to- face dimensions according to Table 1 of IEC 60534-3.

Table 2 Alternative face-to face dimensions for flanged SSDs

Nominal size Nominal pressure Limit deviations for face-to-face dimensions in mm

PN 10/16/25/40/50 a PN 110

Face-to-face dimensions in mm

25 160 230

2

40 200 260

50 230 300

65 290 b 340 b

80 310 380

100 350 430150 480 550

200 600 650

250 730 775

300 850 900 3

400 1 100 1 150

Source: Table 2 of EN 60534-3-1:2000 with addition of PN 50 and replacement of PN 100 by PN 110(nominal pressure in accordance with the relevant parts of ISO 7005 some parts of these document can bereplaced by the equivalent documents when they are available. At the time of writing, this subject is dealt within EN 1092-1, EN 1092-2, EN 1092-3, EN 1092-4, EN 1759-1, EN 1759-3 and EN 1759-4).

a In some countries the group PN 10/16/25/40/50 also includes PN 6.

b Face-to-face dimensions according to Table 2 of IEC 60534-3.

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Table 3 Face-to-face dimensions for flangeless SSDs

Nominal size Face-to-face dimensions in mm Limit deviation for face-to-facedimensions in mm

25 102 1,5

40 114 1,5

50 124 1,5

80 165 1,5

100 194 1,5

150 229 1,5

200 243 1,5

250 297 2,5

300 338 2,5

400 400 2,5

Source: EN 60534-3-2 (nominal pressure according to the relevant parts of ISO 7005 some parts of thesedocuments can be replaced by the equivalent documents when they are available. At the time of writing, thissubject is dealt with in EN 1092-1, EN 1092-2, EN 1092-3, EN 1092-4, EN 1759-1, EN 1759-3 and EN 1759-4).

NOTE 1 Nominal pressures: PN 10/16/20/25/40/50/110. In some countries this group also includes PN 6.

NOTE 2 Face-to-face dimensions do not include any allowances for gaskets to seal the joints between the SSD ends and the

pipeline flanges.

Table 4 Face-to-face dimensions for flangeless SSDs

Nominal size Face-to-face dimensions in mm for Limit deviations forface-to-face dimensions in

mm

PN 10/16/20/25/40/50 a PN 110

25 77 86,5 1,5

40 77 86,5 1,5

50 77 86,5 1,5

80 94 104 1,5

100 114 133 1,5

150 140 175 1,5

200 171 205 1,5

250 203 240 2,5

300 240 280 2,5

400 320 350 2,5

NOTE 1 Face-to-face dimensions do not include any allowances for gaskets to seal the joints between the SSD end and

the pipeline flanges.

NOTE 2 Nominal pressure according to the relevant parts of ISO 7005 (some parts of these documents can be replaced by

the equivalent documents when they are available. At the time of writing, this subject is dealt with in EN 1092-1, EN 1092-2,

EN 1092-3, EN 1092-4, EN 1759-1, EN 1759-3 and EN 1759-4).

aIn some countries the group PN 10/16/20/25/40/50 also includes PN 6.

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4.1.6 Sealing of the adjusting device

A means for sealing the adjusting device shall be provided. If requested in the order specification the adjustingdevice shall be sealed.

4.1.7 Set range

Components may be replaced to cover the whole set range. In this case, the manufacturer shall specify thenecessary procedure in the operating manual.

4.1.8 External visual Indication of the position of the closing member

!SSDs shall be fitted with an external visual device which clearly indicates whether the closing member is inthe open or closed position."

4.1.9 Springs

Springs shall not be overstressed under any operating conditions and there shall be sufficient free movementof the spring to allow satisfactory operation.

The spring shall be designed such that buckling does not occur, in accordance to EN 13906-1 andEN 13906-2.

4.1.10 Parts transmitting actuating forces

Parts transmitting actuating forces should be metallic and designed with a safety factor of 3 againstpermanent deformation.

4.1.11 !Replaceable parts that can be affected by erosion or abrasion

The seat ring shall be replaceable where erosion or abrasion can occur."

4.2 Materials

4.2.1 Requirements for metallic materials

4.2.1.1 Pressure containing parts and inner metallic partition walls

The pressure containing parts, including those that becomes pressure containing parts in the event ofdiaphragm or differential pressure seal failure and the inner metallic partition walls can be constructed of:

materials complying with the restrictions given in Table 5 and an established national or an internationalstandard;

or materials given in Annex J.

The internal components of an SSD not subjected to differential pressure, may be constructed of either thematerials given in Annex J or materials complying with the requirements given in Table 5, without taking intoaccount the restrictions for pressures and nominal sizes, or of different materials provided they comply withthe requirements of this document.

4.2.1.2 !Material inspection documents"of pressure containing parts and inner metallicpartition walls

!This sub-clause specifies the different types of inspection documents supplied to the purchaser, inaccordance with the requirements of the order, for the delivery of components used for SSDs."

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Pressure containing parts and inner metallic partition walls:

bodies used in the SSDs category II, III and IV according to Annex II of PED, shall be accompanied by amaterial!inspection certificate"type 3.2 in accordance with EN 10204.For these bodies when the material manufacturer has an appropriate quality-assurance system, certified

by a competent body established within the EC and having undergone a specific assessment formaterials, an!inspection certificate"type 3.1 in accordance with EN 10204 may be used;

bodies used in the SSDs category I according to Annex II of PED, shall be accompanied by an inspectiondocument type 2.2 in accordance with EN 10204.

Pressure containing parts and inner metallic partition walls of other components used for SSDs with:

!PS 25 bar can be accompanied by a material test report at least type 2.2 in accordance withEN 10204;

PS >25 bar shall be accompanied by a material inspection certificate at least type 3.1 in accordance withEN 10204."

4.2.1.3 Fasteners, integral process and sensing lines and connectors

Fasteners, integral process and sensing lines and connectors can be made of:

materials complying with the restrictions given in Table 5 and with a national or an internationalestablished standard;

or materials given in Annex J.

4.2.1.4 !Material inspection documents"of fasteners and compression fittings

!This sub-clause specifies the different types of inspection documents supplied to the purchaser, inaccordance with the requirements of the order, for the delivery of components used for SSDs."

Bolts, screws, studs, nuts and compression fittings used in the pressure containing parts of the SSDs shallbear the marking in accordance with the relevant standard and they shall be accompanied by !a materialtest report"type 2.2 in accordance with EN 10204.

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Table 5 Materials

Restrictions

Material Safety shut-off device

Group Properties

Amina

%

PSmax

bar

(PS DNb)max

bar mm

DNbmax

mm

Pressure containing parts and inner metallic partition walls

Rolled and forged steel c 16 100 - -

Cast steel c 15 100 - -

Spheroidal graphite cast iron d 7 20 1 500 1000

15 50 5 000 300

Malleable cast iron 6 20 1 000 100

Copper-zinc wrought alloys 15 100 - 25

Copper-tin and copper-zinc cast alloys 5 20 1 000 100

15 100 - 25

Aluminium wrought alloys 4 20 - 50

7 50 - 50

100 - 25

Aluminium cast alloys 1,5 10 250 150

4 20 1 600 1 000

Integral process and sensing lines

Copper - 25 - -

Steel - 100 - -

Connectors

Steel 8 - - -

Fasteners

Steel for bolts, screw, studs 9 50 - -

12 100 - -

NOTE For castings the specified mechanical characteristics are those measured on machined test piece prepared from

separately cast test samples in accordance with the relevant standard for the selected materials.

a A= percentage elongation after fracture (according to the applicable standard relevant to the chosen material).

b For the bodies of pilots or fixtures this term shall refer to their inlet connections.

!cBending rupture energy measured in accordance with EN 10045-1 shall be not less than 27 J as average of three test pieces with

minimum individual of 20 J at minimum operating temperature (-10 C or -20 C)."

d Bending rupture energy measured in accordance with EN 10045-1 shall be not less than 12 J as an average of three test piecesand no less than 9 J as a minimum individual value at a temperature of -20 C for PS > 25 bar when used in SSD class 2.

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4.2.1.5 Manufacturing

The manufacturer shall state the selected material standards in the relevant documentation (see 8.1.1).

!Fabrication welds in all pressure containing parts shall be made using qualified welding procedures in

accordance with applicable EN ISO 15607, EN ISO 15609-1, EN ISO 15610, EN ISO 15611, EN ISO 15612,EN ISO 15613, EN ISO 15614-1 and EN ISO 15614-2 and by qualified welders or welding operatorsaccording to applicable EN ISO 9606-2, EN ISO 9606-3, EN ISO 9606-4, EN 287-1 and EN 1418."

In addition, for fabrication welds to make bodies, blind flanges, bonnets and actuator casings:

only full penetration welds shall be used;

weld fabrication and heat-treatment shall comply with EN 13445-4.

These additional requirements are not applicable to seal welding.

For all pressure containing parts and inner metallic partition walls, the manufacturer shall identify the materialthroughout the production from receipt up to the final routine tests by markings or labelling.

4.2.1.6 Non destructive testing (NDT)

Steel bodies shall be non-destructively tested in accordance with Tables 6 and 7.

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Table 6 Non destructive testing

!

Type of non destructive testing

Volumetric Surface

Radiographic Ultrasonic VisualMagneticparticle

Liquidpenetrant

Sectionstobeexaminedand/or

extentofcoverage

Steel castings EN 12516-1:2005, 10.3.2Accessible

surfaces

EN 12516-1:2005, 10.3.3Forgings, bars,plates and tubularproducts

EN 12516-1:2005, 10.4 and 10.5 Not applicable

Fabrication welds According to E and F in Table 7Accessible

surfacesAccording to B in Table 7

NDT procedures andacceptance criteria forcastings, forgings and theirfusion weld repairs

EN 12516-1:2005,

Annex B

EN 12516-1:2005,

Annex E

MSS

SP 55:1985 a

and EN 970 b EN 12516-1:2005,

Annex C

EN 12516-1:2005,

Annex DNDT procedures andacceptance criteria forfabrication welds, including

their repairs

EN 12516-1:2005, 10.6

and Annex B

EN 12516-1:2005, 10.6

and Annex E

EN 970 b

General

requirements

Examinations shall be performed on the material after heat treatment required by the material or welding,either before or after the finish machining at the option of the manufacturer.

Accessible surfaces in case of surface examination include exterior and interior surfaces but not threads,drilled or threaded holes etc.

a This document is applicable only to steel castings.

b This document is applicable only to fusion weld repairs.

NOTE EN 12516-1 is equivalent to ASME B16.34:1996 mentioned in the previous edition of this document.

"

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Table 7 Minimum inspection sample

pmax DN

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!The resistance to liquids of functional non metallic parts shall meet the requirements in Table 8."

After immersion for one week at 23 C 2 C in test liquid A (100 % n-pentane) as specified in ISO 1817,followed by drying in an oven at 70 C 2 C, the change in mass when determined by the method specifiedin 5.4 of EN ISO 175:2000 shall comply the requirements in Table 8.

Table 8 Requirements for non metallic materials different from those in 4.2.2

Property Determination ofchanges in mass

Requirements

Maximum change in mass after one week at 23 C 2 C EN ISO 175 5 %

Maximum change in mass after drying in an oven at 70 C 2 C EN ISO 175 +5 % /-2 %

4.3 Strength of housings

!deleted text"

4.3.1 !Body and its inner metallic partition walls"

The limit pressurepl(determined or calculated in accordance with 7.3), maximum allowable pressure PS and

maximum inlet pressurepumaxshall be as follows:

pl SbPS Sbpumax

4.3.2 Flanges

!The maximum allowable operating pressure for flanges in accordance to the relevant parts of ISO 7005shall not be less than maximum allowable pressure PS (some parts of these documents can be replaced bythe equivalent documents when they are available). Flanges shall be in accordance with EN 1092-1,EN 1092-2, EN 1092-3, EN 1092-4, EN 1759-1, EN 1759-3 and EN 1759-4."

4.3.3 !Other pressure containing parts

4.3.3.1 General

The other pressure containing parts are classified in the following three groups:

I) parts that are subjected to inlet pressure under normal operating conditions and that are designed towithstand a maximum allowable pressure equal to PS, e.g. specific pressure containing parts of SSD,

controller as per Figure 2;

II) parts that are connected to the body as a result of a failure conditions (e.g. casing of controller as perFigure 1) and that are either designed to withstand a maximum allowable pressure equal to PS or that aredesigned to withstand a specific maximum allowable pressure of PSD which is lower than PS and withadditional protective measures;

III) parts that can never be subjected to inlet pressure even in the case of failure conditions and that aredesigned to withstand a maximum allowable pressure PS or a specific maximum allowable pressure PSDwhich is lower than PS, e.g. controller as per scheme 1a of Figure 1).

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4.3.3.3 Differential strength safety shut-off devices

SSDs classified as differential strength SSDs include some pressure containing parts designed to withstand

the specific maximum allowable pressure PSD where PSD

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4.3.6 Welded joint coefficient

!For welded joints both in pressure containing parts and into inner metallic partition walls, the joint

coefficient shall not exceed the following values:

for welded joints subject to 100 % NDT: 1;

for welded joints subject to random NDT: 0,85;

for welded joints not subjected to NDT other than visual inspection: 0,7."

5 Functional requirements

5.1 General

5.1.1 Shutting-off and opening

The shutting-off of the gas flow shall be automatic and shall not be interruptible until the closed position of theclosing member has been reached.

!The opening of SSDs shall only be possible by manual operation."

5.1.2 Mounting position

SSDs within the scope of this document shall function in any mounting position specified by the manufacturer,

5.

5.1.3 Bypass

If an internal bypass is fitted for the purpose of pressure equalization it shall close safely and automaticallybefore or during tripping.

5.1.4 Ice formation

If requested in the order specification, the SSD shall be type-tested in accordance with the customerrequirements, for example in accordance with Annex A.

5.1.5 Fail-close conditions

!SSDs of class A shall fail closed in the following cases:

damage to the pressure detector element (e.g. diaphragm);

failure of the external power supply unless a backup system is provided.

NOTE Failure of a bellows or pressure detector element piston-type, need not be considered."

5.1.6 Pressure drop

When the body of the SSD is not a full bore ball valve type (see ISO 5752), the pressure drop in relation to theoperating conditions shall be specified by the manufacturer if required in the order specification.

For SSDs with straight full bore bodies or similar, the pressure drop calculated for the pipework shall includethe face-to-face dimension of the valve.

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For SSDs incorporated in a regulator the calculation of pressure drop may be carried out by the reciprocal ofthe formulae (3) or (5) in EN 334:2005.

For stand-alone SSDs the calculation of pressure drop may be carried out by the formula as detailed inAnnex C.

5.1.7 !Surveillance and maintenance

SSDs of Class A and B require suitable surveillance checks and maintenance, particularly Class B, to guardagainst premature and/or unnoticed failure of the pressure detector element.

In the case of SSDs of Class B the manufacturer shall draw the attention of the user to the residual risksassociated with the pressure detector element. The notice concerning the residual risks shall be included inthe documentation (8.2.3)."

5.2 Shell strength, external tightness and internal sealing

5.2.1 Shell strength

Pressure containing parts subjected to the test described in 7.5 shall show no visible leakage and nopermanent deformations exceeding 0,2 % or 0,1 mm, whichever is greater.

The percentage of the permanent deformation is calculated as:

l

ll 0100

where

l0 is the distance between any two points on a pressure containing part before applying the testpressure;

l is the distance between the same points after releasing the test pressure.

5.2.2 External tightness

The pressure containing parts and all connecting joints shall be leak-proof when tested in accordance with 7.7.

5.2.3 Internal sealing

For slam shut device:

the requirements of internal sealing are met when:

bubble tight for a time of 5 s;

leakage is no higher than the value given in Table 14. These values are to be used both in the test atambient temperature and the tests at limit temperatures.

Recognised alternative detection methods may be used for checking the internal leakage (e.g. electronicdevice).

For such methods the equivalence of the above requirements shall be demonstrated.

The accumulated internal leakage from internal walls, the closing member in its closed position, any bypassand connecting joints shall not exceed the values shown in Table 14 when tested in accordance with 7.8.

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For cut-off devices:

the leakage class in accordance with EN 1349 shall be established as specified in the order specification.

5.3 Accuracy group

The trip pressure deviation for an SSD shall conform to an accuracy group of Table 10.

Table 10 Specified accuracy groups

Accuracy group Permissible deviation

AG 1

AG 2,5

AG 5

AG 10

AG 20

AG 30

1 %a

2,5 %a

5 %a

10 %a

20 % b

30 % b

a Or 1 mbar, whichever is greater.

b For set values 200 mbar only.

An SSD type can conform to different accuracy groups as a function of the set range !Wdoand Wdu"or

of the inlet operating pressure range!bpu".

At the lower limit temperature the permissible deviation for the declared accuracy group may move to a less

stringent group as detailed in 7.9.3.

5.4 Response time

The response time tashall be:

for slam shut devices: 2 s;

for cut-off devices 0,08 DN s for DN 250 and 0,06 DN s for DN >250.

For cut-off devices lower response times may be specified in the order specification.

Adjustable response time may be requested in the order specification.

5.5 Relatching difference and unlatching

5.5.1 Relatching difference

The relatching difference pwshall be measured in accordance with!7.11".

5.5.2 Unlatching under mechanical impact

When subjected to the test in accordance with 7.11 no unlatching of the SSD shall occur.

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5.6 Closing force

When tested in accordance with 7.12, the closing force shall ensure closing of the closing member by asufficient safety factor under all operating conditions. In the case of closing springs, appropriate measuresagainst breakage shall be considered as those detailed in 4.1.9.

The closing forces shall correspond to the following:

open position:

DfWfSfRF +5s

closed position:

WfSfRF 52,s

where

FS is the closing force;

R is the friction force, (non static friction);

S is the unbalanced load from static pressure;

W is the weight of the moving parts;

D is the dynamic force on the closing member from the mass flowing through the SSD;

f = 1,1 where the force opposes the closing of the closing member;

f = 0,9 where the force assists the closing of the closing member.

The addition (+) is applied when the force opposes the closing of the closing member and the subtraction (-)when the force assists the closing of the closing member.

The dynamic force (D) is considered zero if it assists the closing of the closing member.

When there is any torque developed in moving parts by the flowing mass it shall be considered whencalculatingFS.

Both formulae shall be verified at the most critical operating conditions in the most critical mounting position.

5.7 Endurance and accelerated ageing

When tested in accordance with 7.13 the SSD shall meet the tightness requirements in accordance with 5.2.2and 5.2.3 and the set pressure deviations shall remain within its AG.

5.8 Strength of the trip mechanism, valve seat and closing member against the dynamicimpact of flowing gas

This requirement shall be applied to SSDs where there is a dynamic impact on the closing member in its fullyopen position.

After testing in accordance with 7.15 the SSD shall meet the internal sealing requirements.

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Table 11 Summary of tests and requirements

Test schedule Requirements Test method

T M S Clause Title Clause

Constructional tests

A A A 4.1 Dimensional check and visual inspection 7.1

A A A 4.2 Materials check 7.2

A 4.3 Verification of the strength of pressure containing partsand inner metallic partition walls

7.3

A 4.1.10 Verification of the strength of parts transmittingactuating forces

7.4

Functional tests

A A A 5.2.1 Shell and inner metallic partition walls strength test 7.5

A A A 5.2.2 External tightness test 7.7

A A A 5.2.3 Internal sealing test 7.8

A A a A a 5.3 Test at ambient temperature 7.9.2

A 5.3 Test at the limit temperatures -20 C or -10 C or 60 C 7.9.3

A 5.3 Verification of the upper limit of highest set range 7.9.4

A A 5.4 Response time 7.10

A 5.5 Relatching difference and unlatching 7.11

A 5.6 Closing force 7.12

A 5.7 Endurance and accelerated ageing 7.13

A 5.8 Verification of the strength of the trip mechanism, valve

seat and closing member against dynamic impact b

7.15

A 5.9 Determination of the flow coefficient c 7.9.5

A 5.10 Final visual inspection after type test 7.16.1

A A 7.16.2 Final visual inspection after routine tests andproduction surveillance

7.16.2

A = Applicable

S = Production surveillance

M = Routine testsT = Type test

!aTest: generally as 7.9.2 but only at ambient temperature, 6 consecutive operations for test S and 2 consecutive operations for

test M. The set range or the specific set range or the trip pressure in accordance to order specifications or at the manufacturersdiscretion when not otherwise specified."

b This test shall be carried out on SSDs only if there is a dynamic impact on the closure member in its fully open position.

c For SSDs with straight full bore bodies or similar, this test is not applicable.

6.3 Type test

Those tests (see Table 11) carried out to establish the performance classification of the SSD or the series ofSSDs. These include verification of the documentation listed in 8.1.1.

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When changes are made to the design of an SSD or a series of SSDs in such a manner as to affect the abovetests, the manufacturer shall inform the parties involved, if any, in the compliance evaluation to this document.

6.4 Selection of test samples

The number and types of SSD to be subjected to type test shall be selected according to the followingrequirements:

at least one SSD for each type of fixture and controller;

at least two sizes (nominal diameter DN);

at least one SSD for each accuracy group (AG)!deleted text".

If the same SSD can be used as a stand-alone or combined device it will be tested only once.

6.5 Routine tests

Those tests (see Table 11) carried out on each SSD by the manufacturer during the production process. Thetests verify that materials, dimensions, external conditions and accuracy groups remain in compliance with theresults of the type test.

Routine tests for integrated pressure regulators, if any, are detailed in EN 334.

6.6 Production surveillance

Those tests and verifications (see Table 11) carried out in order to confirm continuing compliance with thisdocument.

The tests and verifications include additionally:

verification of routine tests records;

verification of drawings and material certificates.

7 Test and verification methods

7.1 Dimensional check and visual inspection

The actions to assess:

the dimensional compliance of pressure containing parts with the applicable drawings;

the compliance of the SSD construction with the relevant assembly drawing and the constructionrequirements of this document.

7.2 Materials check

The actions to assess the compliance of the materials used or prescribed with the requirements in 4.2.

The verification of the materials used shall be carried out by the review of the material certificates.

The verification of the materials prescribed shall be carried out by the review of the list of parts.

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7.3 Verification of the strength of pressure containing parts and inner metallic partition walls

7.3.1 Strength calculation method

Verification is made by proving the compliance of the actual safety factors with those specified in 4.3.5 and the

compliance of minimum allowable thicknesses shown in drawings with values specified in the strengthcalculations.

Strength calculation!shall"be carried out according to EN 12516-2 and!EN 12516-4".

7.3.2 Experimental design method

Verification is made by proving the compliance of the actual safety factors with those specified in 4.3.5 takinginto account the minimum allowable thicknesses shown on drawings and the minimum proof stress (yielding)for selected material.

Actual safety factors are obtained through one of the following two ways:

hydrostatic pressure test until the first sign of yielding or failure becomes apparent in any component andverification that the limit pressureplat which the first sign of yielding or failure becomes apparent is:

min2,0p

r2,0p

min

ry

bl PSR

R

s

sSp for the body only;

min2,0p

r2,0p

min

ry

l PSR

R

s

sSp for other components;

hydrostatic pressure test and verification that permanent deformations do not exceed the values stated in5.2.1, however up to the following test pressures:

min2,0p

r2,0p

w

rwbPS9,0

R

R

s

sS for the body only;

min2,0p

r2,0p

w

rwPS9,0R

R

s

sS for other components;

where

smin is the minimum design wall thickness at the point where the first sign of yielding occurs in

mm;

sry is the measured wall thickness of test sample at the point where the first sign of yielding

occurs in mm;

|Rp0,2|min is the minimum proof stress (yielding) for selected material according to relevant

document in N/mm2;

|Rp0,2|r is the measured proof stress (yielding) for the material of the test sample according torelevant document in N/mm2;

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sw is theminimum design wall thickness for the weakest point in mm;

srw is themeasured wall thickness of test sample for the weakest point in mm.

The weakest point can be located by technical evaluation or via measurements (strain gauge etc.).

The test is carried out in such a manner that deformations of the test sample in all directions are possible.There shall be no additional stresses due to bending, torque or tension.

Forces from fastening systems shall be similar to those experienced under normal installation conditions.

SSD bodies and pressure containing parts manufactured from different materials may be pressure testedseparately.

!Special high strength clamping bolts, nuts and gaskets (between individual pressure containing parts) maybe used for hydrostatic testing."

!For the component with the specific maximum allowable pressure PSD, in the above two formulae (not inthose referred to body) replace the symbol PS with the symbol PSD."

Diaphragms used as pressure containing parts in chambers subjected, or that can be subjected to a maximum

differential pressure pmaxshall withstand a test pressure (in bar) of at least:

0,3 bar ifpmax

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Table 12 Pressure values for the shell strength test

!

Chambers with the maximum allowable

pressure PS

Chambers with specific maximum allowable

pressure PSD

Test pressures

1,5 PSbut at least PS + 2 bar

1,5 PSDbut at least PSD+ 2 bar

"

7.6 Alternative shell and inner metallic walls strength test

Hydrostatic pressure tests as detailed in 7.5 can be replaced by other tests (e.g. pneumatic test) whose

reliability shall be demonstrated. For tests other than the hydrostatic pressure test, additional safety measures,when appropriate, such as non-destructive tests or other methods of equivalent validity, shall be appliedbefore those tests are carried out.

7.7 External tightness test

7.7.1 External tightness test of metallic housing

The assembled SSD and its fixtures are pneumatically tested to assess compliance with the requirements of5.2.2. The test is carried out at ambient temperature with air or gas at the test pressure specified in Table 13.This test shall be carried out on a strength-tested SSD for at least:

15 min in the type test,

1 min in the routine tests and in the production surveillance.

The result of test is satisfactory if one of the following conditions is met:

bubble tight for a time of 5 s. This test may be carried out by covering the SSD with a foaming liquid, byimmersing the SSD into a tank of water or by other equivalent methods;

external leakage not higher than the values listed in Table 14 only for cut-off devices.

The test pressures in Table 13 do not apply to any chambers bounded on at lea