Introduction_to_mesc_group_77[1].pdf

8/19/2019 Introduction_to_mesc_group_77[1].pdf

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MESC ADDITIONAL REQUIREMENT Revision: 13- Apr- 2005.

INT 77 / 001 Page 1 of 8.

77 VALVES AND ACCESSORIES

Introduction to MESC Group 77.

1. INTRODUCTION

Valves specified in group 77 cover most types and sizes required for the group's field,refinery, chemical plant and utility piping systems, coherent with 'tubulars' and 'fittings'specified in MESC groups 74 and 76 respectively.

Valves for special applications are coded in their relevant groups, e.g.:

- group 09, wellhead valves- group 44, valves for LPG cylinders- group 60, solenoid valves and control valves for process instrumentation- group 61, vacuum and pressure relief valves for tanks- group 80, valves for sanitary requirements- group 90, valves for laboratory use

In these groups the different types of valves are grouped together in alphabeticalorder, with the main body material and end connections at sub-group level followed bya breakdown per material type for the trim and service application at sub-sub grouplevel.

Valve additional requirements are presented in section 5.

They reflect latest Shell policies and piping class requirements as well as presentcapabilities of valve manufacturers.

Additional requirements which were used together with locally coded (dot 9) valveshave been removed, i.e.:- SPE 77/132 for regular/full opening swing check valves to API 6D,- SPE 77/163 for axial disc check valves to ASME B 16.34,- SPE 77/164 for pressure balance piston shut-off valves,- SPE 77/210 for valves in sub-sea service.

For detailed information refer to section five - Introduction to additional requirements.

2. VALVE SELECTION

For guidance in selecting the appropriate valves for any particular service, referenceis made to 'design and engineering practice' publications DEP 31.38.01.12-gen andDEP 31.38.01.15-gen.

These valves are incorporated in the MESC database.

3. VALVE TYPES

3.1 ANGLE VALVESThe application of angle type globe valves is not recommended and they havetherefore not been included as a group standard with the exception of small size

needle type globe valves for instrumentation purposes.


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INT 77 / 001 Page 2 of 8.

3.2 BALL VALVESBall valves are compact, have a positive shut-off and are easy to operate andmaintain. They are available as 'soft seated' and 'metal seated' valves, both with'reduced' and 'full' bore.

A disadvantage of soft-seated ball valves is the restricted temperature rating becauseof the polymers and elastomer seats and seals.Metal-seated valves shall be used for temperature ranges exceeding the rangesspecified for soft-seated valves.

3.3 CAST-IRON AND DUCTILE IRON VALVESFor safety reasons cast-iron valves shall not be used. A limited range of lined butterfly, diaphragm, ball and check valves with bodymaterials made of ductile iron ion are included in MESC.

3.4 CHECK VALVESCheck valves DN40 and smaller shall be of the ball type or piston type.Check valves DN50 and larger shall be of the swing type or dual-plate type.

3.5 GATE VALVES AND GLOBE VALVESGate and globe (needle type) valves in the sizes DN40 and smaller are specifiedin EN ISO 15761. Globe (plug/ball type) valves are not available in sizes larger than DN 300.

3.6 HIGH PERFORMANCE BUTTERFLY VALVESHigh performance butterfly valves (HPBV) are included as an alternative to gate andball valves, since lug and single flange HPBV offer space and weight savings. Theyare available as 'soft seated’, ‘metal/soft' and 'metal seated'.The recommended body styles are double flanged, lug and single flange.

3.7 PLUG VALVESThe selection and use of plug valves (i.e. pressure balanced and sleeve types)and double plug isolation valves shall follow the requirements of the DEP manuals.

3.8 PRESSURE SEAL VALVESGate, globe and check valves with a pressure seal type bonnet/cover connectionoffers in-line maintainability as well as reduced weight (compared with flangedbody/bonnet connections).Pressure seal type valves shall be used for steam services in the ASME pressureratings 900 to 2500.

3.9 SLIM LINE GATE AND GLOBE VALVESGate and globe valves with a slim line body are single flanged and available in the

size range DN50 and smaller with a minimum pressure rating of ASME class 300. Inthe higher-pressure ratings they offer space and weight savings as compared to thetraditional valves. However, these valves are not yet available in MESC.

4 VALVE DETAILS

4.1 BY-PASSES

A by-pass, when necessary, shall be fitted locally. If valves shall be supplied completewith by-pass this shall be clearly specified in the requisition and/or purchase order.

4.2 FLANGES

Valves shall be supplied with drilled flanges as specified in the MESC buyingdescriptions.


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INT 77 / 001 Page 3 of 8.

4.3 FINISH OF FLANGE FACINGS

Flanged valves shall be executed with a smooth flange surface finish

(Ra 3.2-6.3 µm), unless otherwise specified in the MESC buying description.

4.4 OUTSIDE AND INSIDE SCREW STEM TYPE VALVES

Valves with outside screw stem (gate and globe) are the preferred standard for thegroup.

4.5 SPARE PARTS FOR VALVES

Spare parts for both valves and valve actuators shall be coded locally in sub groups77.90 to 77.99. Valve actuators shall be coded in sub group 77.88.

4.6 FIRE-TESTED OR FIRE-SAFE DESIGNS

Normally fire safe or fire-tested valves shall be used. When valves have limitations,this shall be clearly addressed and these valves shall not be used in locations thatmay be exposed to a fire hazard.

5. INTRODUCTION TO ADDITIONAL REQUIREMENTS

5.1 The additional requirements (SPE’s) reflect the latest Shell policy and piping-classrequirements as well as the present capabilities of manufacturers.

For valves the following categories of additional requirements (SPE’s) are available:

A Additional requirements to the 'individual' valve design codes, e.g. BS, API, ASME.

B Requirements unique to a specific service.

C Requirements that cover testing, painting and coating.

D Requirements for sealing materials (gaskets, packing, O-rings).


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INT 77 / 001 Page 4 of 8.

5.2

5.2.1

The breakdown per category is as follows:

I. CATEGORY A:

Short Description For Sizes Design Code SPE

1. Ball valves DN 8 to DN 400 BS 5351 77/100

2. Gate, globe, check valves DN100 andsmaller

ISO 15761 77/101

3. Gate valves DN50 and larger ISO10434,and API 600.

77/102

4. Globe valves DN50 to DN 400 BS 1873 77/103

5. Check valves DN50 to DN 600 BS 1868 77/104

6. Gate, globe, globe stopand check valves (copperalloy)

DN8 to DN 80 BS 5154 77/105

7. Butterfly valves(resilient lined and softseated)

DN50 to DN900 API 609,EN 593 orMSS SP67

77/106

8. Plug valves DN15 to DN600 BS 5353 77/107

9. Diaphragm valves DN15 to DN300 EN 13397 andBS 5156

77/108

10. Metal ball valves DN 15 to DN400 ISO 17292 77/110

11. Ball valves DN 50 and larger ISO 14313 and API SPEC 6D

77/130

12. Through conduit gatevalves

DN 50 and larger ISO 14313 and API SPEC 6D

77/131

13. Cancelled and removed 77/132

14. Dual plate check valves DN50 and larger API 594 77/133

15. Butterfly valves(high performance, off-settypes)

DN40 and larger API 609,EN593, MSSSP67, MSSSP68 or mfr std

77/134

16. Safety/relief valves,spring loaded,pilot operated.

DN 25-200 inletsDN 50-250 outlets

API 526 77/135

17. Incorporated in SPE 77/134 77/136

18. Rising stem non contactball valves

DN 50 and larger ISO 14313(API 6D)

77/140


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INT 77 / 001 Page 5 of 8.

19. Gate, globe and checkvalves (with pressure sealor breech lock bonnet)

DN50 to DN 600 ASME B16.34 77/160

20. Gate, globe and checkvalves (classes 1500,2500 and 4500)

DN 15 to DN50 ASME B16.34 77/161

21. Gate, globe and ballvalves (mono flange -slim-line body)

DN50 and smaller MFR STD 77/162



24. Integral double block andbleed valve assemblies.

DN50 and smaller MFR STD 77/165

25. Integral double block andbleed valve assemblies

DN80 to DN250 MFR STD 77/166

26. Ball valves and checkvalves (lined).

DN15 to DN200 MFR STD 77/190

27. Ball valves,(small bore, highpressure).

DN15 to DN40 ASME B16.34 77/191

5.2.2 II. Category B:

Short Description SPE

1. Valves in services below minus 50ºC 77/200

2. Valves for vacuum service 77/201

3. Valves in steam service 77/202

4. Valves in hydrogen service 77/203

5. Valves in Hydro Fluoric (HF) service 77/204

6. Valves in oxygen service 77/205

7. Valves in chlorine service 77/206

8. Valves in ethylene oxide (EO) and 1,3 butadiene services 77/207

9. Gate and globe valves with restricted gland packingtolerances for specific service with tight fugitive emissionrequirements.

77/208

10. Valves in services between zero and minus 50ºC 77/209


12. Valve stem and stem adapter dimensions and bracket drillingpatterns for actuated quarter turn valves.

77/211


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INT 77 / 001 Page 6 of 8.

5.2.3 III. Category C:


1. Spare 77/300

2. Cancelled. 77/301

3. Materials, examination and certification requirements for valves ingeneral services

77/302

4. Materials, examination and certification requirements for valves inspecial services

77/303

5. Cancelled and removed. Now included in SPE 77/302 77/304


7. Production testing of valves in low temperature services 77/306

8. Production testing of valves in vacuum service 77/307

9. Production testing of valves in hydrogen and wet HydrogenSulphide (H2S) services.

77/308

10. Production testing of soft seated gate valves used for doubleblock and bleed service.

77/309

11. Painting and coating of valves. 77/310

12. Lining for valves 77/311

13. Industrial valves: Fugitive emission measurement,classification system, qualification procedures and prototypeand production tests of valves.

77/312

14. Cladding overlays for valves 77/313

15. Spare 77/314

16. Auto catalytic (Electroless) Nickel Phosporus (ENP) plating ofsealing surfaces for corrosion resistant, wear or anti-galling

coating.

77/315

17. Cancelled and removed. Now included in SPE 77/315. 77/316

18. Spare 77/317

19. Spare 77/318

20. Spare 77/319



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INT 77 / 001 Page 7 of 8.

5.2.4 IV. Category D:


1. Gaskets, metal grooved with a facing layer on both sides,design to BS EN 1514 part 4 and prEN 12560-6.

85/100

2. Graphite gaskets, flat sheets and rings, with or without stainlesssteel insert(s), design to BS EN 1514-1 and PrEN 12560-1.

85/101

3. Gaskets, flat ring, virgin PTFE with perforated steel insert 85/102

4. Gaskets, spiral wound to BS EN 1514-2, BS EN 12560-2 and ASME B 16.20

85/103

5. Gaskets (rings and sheets), PTFE, reinforced with mineral filler(s) 85/104

6. Cancelled (CAF and asbestos materials) 85/105

7. Gaskets, fibre, nitrile rubber bonded 85/106

8. Gaskets (rings and sheets), 100% (bi-axially) expanded PTFE(ePTFE), rigid quality.

85/107

9. Elastomeric gasket types (CR, NBR, IIR) 85/108

10. Gasket tape, 100% (bi-axiallly ) expanded PTFE 85/109

11. Available gasket and sealing materials INF 85/115

12. Packing, recommended makes and styles 85/200

5.2.6 MESC additional requirements, are mandatory when referred to in a MESCdescription.

A MESC description shall refer to only one specification from category "A".To complete the MESC buying description one or more additional requirements fromcategories “B”, "C" and/or “D” may be required (see example below).

A MESC description and all additional requirements referred to shall be considered asa unit.


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INT 77 / 001 Page 8 of 8.

5.2.7 Example:

A MESC description calls for mandatory additional requirements:SPE 77/102, SPE 77/200, SPE 77/302, SPE 77/306, SPE 77/312 and SPE 85/103.

This means ‘CATEGORIES’:

A B C D

Whenever deviated from centrally coded standard buying descriptions and/or additional

requirements, the unique (dot 1) MESC number(s) shall not be used anymore and thePrincipal shall create locally coded (dot 9) MESC number(s) instead.

However, as a good policy, adherence to the available standard description is essential toobtain the full benefits of standardisation and procurement co-ordination.

Alternatively you may contact Shell Global Solutions International – GSEM-1.

SPE 77/200

VALVE SERVICES

BELOW MINUS 50°C

SPE 77/302

MATERIALS

ACCEPTANCE REQ

SPE 77/306

PRODUCTION TESTING

LOW TEMP

SPE 77/312

FUGITIVE EMISSION

LEAK DETECTION

SPE 85103

GASKET SPW

BS3381/ASME B16.20

SPE 77/102

GATE VALVE

BS 1414

SPE 77/200

VALVE SERVICES

BELOW MINUS 50°C

SPE 77/302

MATERIALS

ACCEPTANCE REQ

SPE 77/306

PRODUCTION TESTING

LOW TEMP

SPE 77/312

FUGITIVE EMISSION

LEAK DETECTION

SPE 85103

GASKET SPW

BS3381/ASME B16.20

SPE 77/102

GATE VALVE

BS 1414

Introduction_to_mesc_group_77[1].pdf

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