Blakeborough Choke Valve

Choke Valves

CV 2-0406

Blakeborough ControlsCHOKE VALVES

2 Weir Valves & Controls First choice for process protection

Weir Valves & Controls

The key to the success of Weir Valves & Controls isour capability to deliver engineering solutions thatadd value to the customer’s process. We offer a totalpackage of products to meet end-to-end projectrequirements. Using our own analysis andconfiguration system, we will design and deliver theoptimum valves and controls solution to protect thevalue of the production process.

A rigorous programme of information managementmeans that the division is able to take a moreanticipatory role in defining the future needs andexpectations of the market by fully utilising theorganisation's critical resources to provide wholeprocess isolation and control valve solutions for theglobal Energy sector.

With a comprehensive range of engineered valveproducts Weir Valves & Controls have developed anextensive global installed base and expertise acrossa wide range of industry sectors:

• Power Generation• General Industrial• Oil & Gas Production• Refining• Petrochemical• Chemical• Pulp & Paper• Desalination

Quality assurance

Weir Valves & Controls operates quality programmesto cover the full scope of their activities.Comprehensive quality systems have beendeveloped to serve the power, oil and gas andindustrial markets which they serve.

The company holds approvals to:

• ASME Section III ‘N’, ‘NPT’, ‘NV’

• ASME Section I ‘V’

• ASME Section VIII code UV

• BS EN ISO 9001:1994

• NF EN ISO 9001

• API Q1 TO API LICENCES API 6D (6D-0182) ANDAPI 6A (6A-0445)

• API 526

• TUV - AD MERKBLATT WRD HP 0

The Quality systems have been approved for thesupply of products to meet the requirements of thePressure Equipment Directive (PED) and compliancemodules A,D1,H,B&D have been applied incategories I through IV respectively.

The company is committed to compliance withlegislation and has an established environment andhealth and safety policy.

An ongoing commitment to customer care is metthrough the process of continuous improvementand the further development of our systems andprocesses towards meeting ISO 9001:2000.

Valve testing facilities

All pressure containing items are hydrostaticallytested, seat leakage tested and functionally tested.In addition, gas, packing emission, cryogenic andadvanced functional testing can be arranged.

Material testing facilities

• Non-destructive examination by radiography,ultrasonics, magnetic particle and liquidpenetrant.

• Chemical analysis by computer controlled directreading emission spectrometer.

• Mechanical testing for tensile properties atambient and elevated temperatures, bend andhardness testing. Charpy testing at ambient,elevated and sub-zero temperatures.

Further technical information can be obtained fromour Web site: http://www.weirvalve.com

CV 2-0406 3Weir Valves & Controls First choice for process protection

Blakeborough Controls CHOKE VALVES

CONTENTS

ASME B16.34 4

API 6A High duty/subsea 5

Application 6

Selection guidelines 7 - 8

Dimensions 9

Blakeborough ControlsThe Control Valve business unit have designed andmanufactured valves for in excess of 40 years. Theircontrol valve product range offers an extensivechoice in terms of size, pressure class, body/trimmaterials, and includes top, top & bottom guidedand cage guided valves. In addition they also supplya wide range of desuperheating equipment tosatisfy power and steam conditioning applications.

6A-04456D-0182

Stem packing system

CV 2-04064 Weir Valves & Controls First choice for process protection

Blakeborough ControlsASME B16.34 CHOKE VALVE

Description

The body/bonnet seal is a high integrity metallic Cseal. The seal loading is obtained from high dutybolting designed to ASME VIII during installationand is pressure energised by the process fluid.

The trim design is cage guided with either solid orbalanced plug design. The cage and seat areclamped into the body to give easy access and easyremoval. The cage can house from 1 to 3 pressurereducing sleeves.

The packing system incorporates a scrapper ring toprevent the ingress of sand to the stem seal. Thestem seal is specially designed low emission packingincorporating 3 self/pressure energised ‘U’ seals.

As a minimum seat faces are stellited however, forhigh service chokes the plug and seat will normallybe manufactured from tungsten carbide oradvanced ceramic. On single phase clean servicesthe seat/plug faces are tapered. On multi-phaseduties and contaminated services a shrouded seatdesign is used to protect the seat faces from theerosive flow. This design directs the flowimpingement away from the valve plug seating face,and the increased deadband and direction of flowprotects the valve.

Features

• Designed to ASME B16.34

• Cast body - Carbon steel, Stainless Steel &Duplex st. st.

• High integrity body/bonnet bolting system

• Seat retained by cage for ease of maintenance

• Large range of single stage and multi-stage trimdesigns

Pressure Rating

ANSI 900 - ANSI 4500

Sizes

2” - 8”

End Connections

• Flanged • RF • RTJ • Hubbed

Actuation (Linear)

• Manual

• Pneumatic (Diaphragm/Piston)

• Electric

• Electro/Hydraulic

Actuation (Stepping)

• Pneumatic

• Hydraulic

The standard ASME B16.34 range of choke valves


Blakeborough Controls API 6 A HIGH DUTY / SUBSEA CHOKE VALVE

Description

The body/bonnet seal is a clamped connection witha hub style seal ring. Sealing integrity is enhancedby applying an inconel overlay to the body andbonnet sealing areas on carbon steel valves.

The trim arrangement is a cage guided designavailable in both solid and balanced configuration.On sub-sea designs the trim is attached to thebonnet forming a cartridge, simplifying retrieval formaintenance.

The packing system incorporates a series of stemscrapper rings to prevent the ingress of sand to thestem seal. The stem seal is specially designed lowemission packing incorporating 3 self/pressureenergised ‘U’ seals.

As a minimum seat faces are stellited, however, forhigh service chokes the plug and seat will normallybe manufactured from tungsten carbide oradvanced ceramic. On single phase clean servicesthe seat/plug faces are tapered. On multi-phaseduties and contaminated services a shrouded seatdesign is used to protect the seat faces from theerosive flow, see protected seating detail opposite.This design directs the flow impingement away fromthe valve plug seating face, and the increaseddeadband and direction of flow protects the valve.

Features

• Designed to API 6A

• Forged or Cast body - Carbon steel, StainlessSteel & Duplex st. st.

• High integrity clamped body/bonnet connection

• Cartridge trim on sub-sea designs for ease ofretrieval

• Extensive range of trim options

Pressure Rating

API 3000 - 10000

Sizes

21⁄16” - 71⁄16”

End Connections

• Flanged • RTJ • Hubbed

Actuation (Topside)

• Manual

• Pneumatic

• Electric

• Electro/Hydraulic

Actuation (Subsea)

• Manual

• Hydraulic (Stepping)

Cartridge trim arrangement


Blakeborough ControlsCHOKE VALVE APPLICATION

Choke valves are required to handle some of themost severe operating conditions:- pressure dropsof up to 500 bar, with erosive fluid mixtures ofhydrocarbon liquids, hydrocarbon gases, sea waterand sand.

The problems associated with this application areflow erosion to the valve body, valve trim and thedownstream pipework, vibration and noise. Therange of products used on this application rangefrom the bean type choke with a fixed area, toneedle and seat designs which are high recoveryand multistage trims.

Consider a fluid passing through a simple orifice(bean) choke. Under high pressure drop conditionsthe fluid pressure drops rapidly below its vapourpressure thereby producing vapour bubbles. As thefluid recovers downstream of the orifice eithercavitation or flashing can occur depending onwhether the downstream pressure is higher orlower than the fluid vapour pressure. If the pressureis lower than the vapour pressure, flashing occurs,and this can cause erosion damage in thedownstream pipework. If the downstream pressureis higher than the vapour pressure then as thepressure recovers vapour bubbles formed duringthe throttling process are no longer in equilibriumand will collapse (or implode) resulting in very highforces being generated. This energy release canresult in significant erosion damage, and extensivenoise and vibration problems. On high recoverydesigns and on severe applications whole sectionsof metal can be eroded away, affecting the pressureintegrity of the valve body and downstreampipework.

On gas flows high uncontrolled velocities can resultin shock waves/turbulence interaction leading tohigh noise levels and vibration problems.

Flashing damage


Blakeborough Controls CHOKE VALVE SELECTION

Choke Valve Selection Guidelines

When specifying choke valves it is critical that thecorrect size, trim design and materials are selectedto ensure a satisfactory life and operation of thevalve.

Our philosophy is to control the energy dissipationwithin the valve and not to pass the problem on tothe downstream pipework.

In the selection process the following considerations/calculations are made and recommended limits onvelocity and pressure drop for trim materialfollowed.

Cavitation Index

Used on liquid service applications to indicatepotential for cavitation. A positive value indicatescavitation. It is normally recommended to eliminatecavitation, however, for intermittent use a low level,<0.5 bar, would be acceptable.

Inlet Velocity & Outlet Velocity

These velocities are limited as per the tables. Thereason for limiting to these values are to minimisevalve body erosion and to minimise the potential forinstability and vibration.

On gas/vapour flows the outlet Mach Number isfurther limited depending on acceptable noise level.For noise levels less than 85 dBA the outlet MachNumber should be limited to <0.3, for noise levels85 dBA - 95 dBA the outlet Mach Number should belimited to 0.5.

Sound Pressure Level

Noise predictions are carried out in order to ensurenoise limits are not exceeded and the energyconversion is dissipated over the correct number ofstages of let-down.

Pressure drop limitations

The above limits are used for liquid serviceapplications to minimise erosion rates. As a generalrule on clean gas/vapour service the stage pressuredrops can be doubled.

Body Size Max. recommended liquid phase velocityLow alloy High alloy

ins. mm ft/s m/s ft/s m/s

2 - 8 50 - 200 52.5 16 58 18

Table 1 - Liquid velocity limits

Body Size Max. recommended gas phase velocityInlet Outlet

ins. mm ft/s m/s ft/s m/s

2 - 8 50 - 200 490 150 0.65 x Sonic 0.65 x Sonic

Table 2 - Gas/vapour velocity limits

Material Stage Pressure DropPsi Bar

316 st. st. 218 1517-4 st. st. NACE 435 3017-4 st. st. 725 50316 st. st. + Stellite 725 50Tungsten Carbide 2175 150Advanced ceramics 2175 150

Table 3 - Pressure drop limitation (liquids)

Note

These limits will be affected by fluid phase and the presenceof contamination. The figures assume that cavitation has beeneliminated.


Blakeborough ControlsCHOKE VALVE SELECTION

Body Size Trim Size Metallic Trim Carbide Trim

(ins) (ins) MF MFP CS2 CS3 PMF MF MFP CS2 CS3 PMF

11⁄2 11⁄2 12 9 8 7 - 9 7 8 7 -11⁄2 38 35 24 12 35 38 35 24 12 35

21⁄2 11⁄2 38 35 24 12 35 38 35 24 12 3521⁄2 70 65 40 10 65 65 61 40 10 65

31⁄2 21⁄2 70 65 40 10 65 65 61 40 10 6531⁄2 150 138 72 36 138 140 130 72 36 138

41⁄2 31⁄2 150 138 72 36 138 140 130 72 36 13841⁄2 230 200 96 48 200 220 188 96 48 200

51⁄2 41⁄2 230 200 96 48 200 220 188 96 48 20051⁄2 360 350 144 72 350 340 327 144 72 350

Table 4 - Design Cv values

Service Body Trim

Standard Carbon St. WCB or AISI 4130 316 & stellite Gr. 6Sour Carbon St. WCB or AISI 4130 (Nace) 316 & stellite Gr. 6 (NACE)Corrosive sour Carbon St. WCB or AISI 4130 + 316 & stellite Gr. 6 (NACE)

inconel in seal area ASTM A182 F316

High duty production Carbon St. WCB or AISI 4130 17-4 PH & tungsten carbideHigh duty production with Carbon St. WCB or AISI 4130 17-4 PH & tungsten carbide withcontaminates protected seat designHigh duty production with Carbon St. WCB or AISI 4130 + Duplex st.st./super duplex st.st. &contaminates, sour inconel, Duplex St.St. tungsten carbide with protected

Super Duplex St.St seat designWater Injection Carbon St. WCB or AISI 4130 316 & stellite Gr. 6Water Injection - high duty Carbon St. WCB or AISI 4130 + 316 & stellite Gr. 6 (NACE) &

inconel in seal area tungsten carbide/advanced ceramicsSt. St. CF8M or Duplex St. St.

Table 6 - Materials of Construction

Body Size Available End Connections

(ins) API (ins) ANSI (ins)

3000 - 10000 900 1500 2500 4500

11⁄2 21⁄16 2 2 2 321⁄2 31⁄8 3 3 3 & 4 431⁄2 41⁄16 4 & 6 4 & 6 4 & 6 641⁄2 51⁄8 6 & 8 6 & 8 6 & 8 851⁄2 71⁄16 6 & 8 6 & 8 8 8

Table 5 - End connection sizes


Blakeborough Controls DIMENSIONS

Nominal End End Connections RatingConnection ANSI 900 ANSI 1500 ANSI 2500

(ins) F M F M F M

2” 71⁄16 7 71⁄8 7 87⁄8 73” 83⁄16 77⁄8 89⁄16 77⁄16 103⁄4 114” 95⁄16 91⁄16 911⁄16 97⁄15 1313⁄16 131⁄4

6” 121⁄4 15 1315⁄16 141⁄4 183⁄4 155⁄8

8” 149⁄16 151⁄4 149⁄16 16 CF CF

Table 7 - ANSI Outline dimensions

Nominal End End Connections RatingConnection API 3000 API 5000 API 10000

(ins) F M F M F M

21⁄16” 91⁄8 8 93⁄8 8 107⁄8 101⁄8

31⁄8” 101⁄8 97⁄8 105⁄8 97⁄8 113⁄8 121⁄4

41⁄16” 121⁄16 13 127⁄16 13 137⁄8 137⁄8

51⁄8” 141⁄8 147⁄8 143⁄8 147⁄8 181⁄8 151⁄8

71⁄16” 171⁄16 171⁄4 171⁄4 171⁄4 CF CF

Table 8 - API Outline dimensions

For dimensions of ANSI 4500 Choke valves consult factory CF = consult factory

M

F

F


Blakeborough ControlsAPPLICATIONS

29 Choke valves supplied to Kalanaft150mm ANSI 900.Carbon Steel WCB body.17-4 PH St. St. Trim with Tungsten Carbide coating.Used on an Oil/Gas application with a 1130 psi (78 bar)pressure drop.

50mm API 5000 Subsea Choke supplied to MazagonDock for an Injection Water application.

4 Choke valves for BP Colombia with electro hydraulic actuators71/16” API 10000.Duplex St. St. (UNS 31803) body.17-4 PH solid Tungsten Carbide, 4-stage Trim.Used on a Produced Water application with a 4300 psi (297 bar)pressure drop. 8 Choke valves for Hyundai Heavy Industries, Korea

100mm ANSI 900 St. St. CF3m, with 17-4 PH St. St. Trim withTungsten Carbide coating.Used on a Natural Gas application.


Blakeborough Controls CHOKE VALVES

Product Portfolio

The following list identifies the product range forBlakeborough - Controls business unit.

For further information please contact our factory inHuddersfield.

Globe & Angle Control valves

Severe service valves

Desuperheaters

Turbine bypass valves

Choke valves

Project Name & Name Valve Size Rating Qty Line fluid Pressure Body/Trim material& Location of Client drop

Caythorpe

Kelt V.K. Ltd 80 mm ANSI 1500 1 Gas/Condensate/Sand 234 bar A105, 17-4 / ceramic

Transmark / Maersk 80 mm ANSI 2500 1 Raw Gas (sour) 245 bar Tungsten Carbide

Tyne & Trent, ARCO 25 mm (h) ANSI 1500 3 Produced Water 118 bar UNS S31803/Ceramic

25 mm (h) ANSI 1500 2 H.C. Condensate 111.4 bar UNS S31803/Ceramic

40 mm (h) ANSI 1500 5 Water 101.2 bar UNS S31803/Ceramic

ETAP, BP Aberdeen (*) 80 mm ANSI 2500 1 Produced Water 354 bar Gr F 60/Ceramic

80 mm ANSI 2500 1 Deaerated Seawater 399 bar Gr F 60/Ceramic

50 mm API 10000 1 Well Stream Fluids 503 bar GrF51/Ceramic

100 mm API 10000 1 Well Stream Fluids 531 bar Inconel/Ceramic

80 mm (h) ANSI 1500 1 Produced Water 35 bar Duplex

200 mm (h) ANSI 1500 2 Hydrocarbon/Liquid/Sand 53 bar Duplex/Tungsten Carbide

80 mm ANSI 2500 3 Produced Water 350 bar F60/Ceramic

Marathon Brae 25 mm API 10000 1 Methanol 680 bar 316 L + Ceramic

Panaqua

ONGC - India 80 mm ANSI 900 32 Produced Water 103 bar WCB/Tungsten Carbide

KOC - Kuwait 150 mm API 5000 16 Produced Water 60 bar 316 L/Stellite

CRMP 1 - India 50 mm API 5000 2 Injection Water 40 bar AISI 4130 Tungsten Carbide

Mazagon Dock (sub sea)

Gupco - Egypt 150 mm ANSI 900 2 155 bar WCB/Stellite

Lakshimi - Hyundai 100 mm ANSI 900 8 Natural Gas 8 bar CF3M/17-4 PH + T.C. Coat.

Kala Naft - Iran 150 mm ANSI 900 29 Oil/Gas 78 bar WCB/17-4 PH + T. C Coat.

Lasmo Oil - Pakistan 100 mm ANSI 900 2 Natural Gas/Liquid 39 bar CF8M/410 + T. C. Coating

Lasmo Oil - Pakistan 150 mm ANSI 900 6 Natural Gas/Liquid 21 bar CF8M/410 + T. Coating

BP Columbia 7.1/16” API 10000 4 Produced Water 297 bar Duplex/17-4PH + Tung.Carbide

Shell Na Kika - LTS 50 mm API 10000 2 Natural Gas 358 bar 660 St. St./316 + T. C. Coating

Examples of Choke Valves Supplied by Blakeborough

Sales/manufacturing:

Weir Valves & Controls UK LtdTel: +44 (0) 1422 282000Fax: +44 (0) 1422 282100Email: [email protected]

Weir Valves & Controls France SASSebim siteTel: +33 (0) 4 42 07 00 95Fax: +33 (0) 4 42 07 11 77Email: [email protected] siteTel: +33 (0) 3 21 79 54 50Fax: +33 (0) 3 21 28 62 00Email: [email protected]

Weir Valves & Controls USA IncTel: +1 978 744 5690Fax: +1 978 741 3626Email: [email protected]

Regional sales offices:

CanadaTel: +1 905 812 7100Fax: +1 905 812 0069Email: [email protected]

ChinaTel: +86 10 8528 8315-7Fax: +86 10 8528 8318Email: [email protected]

MalaysiaTel: +60 3 2287 3560Fax: +60 3 2287 3561Email: [email protected]

Middle EastTel: +971 4 883 6396Fax: +971 4 883 6126Email: [email protected]

KoreaTel: +82 31 493 7979Fax: +82 31 495 3737Email: [email protected]

AustraliaTel: +61 2 4349 2999Fax:+61 2 4349 2900Email: [email protected]

South AfricaTel: +27 1 1929 2906Fax:+27 1 1929 2925Email: [email protected]

Division head office:

Weir Valves & ControlsTel: +44 (0)1484 824200Fax: +44 (0)1484 824230Email: [email protected]

Local Representative

A list of worldwide agents is available onrequest

Weir Valves & Controls UK Ltd

Britannia HouseHuddersfield RoadElland, West YorkshireHX5 9JR England

Tel: +44 (0) 1422 282 000Fax: +44 (0) 1422 282 100Email: [email protected]

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CV 2-0406

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Blakeborough Choke Valve