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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 alphabetical order, with the main body material and end connections at sub-group level followed by a breakdown per material type for the trim and service application at sub-sub group level. Valve additional requirements are presented in section 5. They reflect latest Shell policies and piping class requirements as well as present capabilities of valve manufacturers. Additional requirements which were used together with locally coded (dot 9) valves have 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, reference is made to 'design and engineering practice' publications DEP 31.38.01.12-gen and DEP 31.38.01.15-gen. These valves are incorporated in the MESC database.
3.
VALVE TYPES
3.1
ANGLE VALVES The application of angle type globe valves is not recommended and they have therefore not been included as a group standard with the exception of small size needle type globe valves for instrumentation purposes.
MESC ADDITIONAL REQUIREMENT
Revision: 13- Apr- 2005.
INT 77 / 001
Page 2 of 8.
3.2
BALL VALVES Ball valves are compact, have a positive shut-off and are easy to operate and maintain. 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 because of the polymers and elastomer seats and seals. Metal-seated valves shall be used for temperature ranges exceeding the ranges specified for soft-seated valves.
3.3
CAST-IRON AND DUCTILE IRON VALVES For safety reasons cast-iron valves shall not be used. A limited range of lined butterfly, diaphragm, ball and check valves with body materials made of ductile iron ion are included in MESC.
3.4
CHECK VALVES Check 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 VALVES Gate and globe (needle type) valves in the sizes DN40 and smaller are specified in EN ISO 15761. Globe (plug/ball type) valves are not available in sizes larger than DN 300.
3.6
HIGH PERFORMANCE BUTTERFLY VALVES High performance butterfly valves (HPBV) are included as an alternative to gate and ball valves, since lug and single flange HPBV offer space and weight savings. They are available as 'soft seated’, ‘metal/soft' and 'metal seated'. The recommended body styles are double flanged, lug and single flange.
3.7
PLUG VALVES The 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 VALVES Gate, globe and check valves with a pressure seal type bonnet/cover connection offers in-line maintainability as well as reduced weight (compared with flanged body/bonnet connections). Pressure seal type valves shall be used for steam services in the ASME pressure ratings 900 to 2500.
3.9
SLIM LINE GATE AND GLOBE VALVES Gate 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. In the higher-pressure ratings they offer space and weight savings as compared to the traditional valves. However, these valves are not yet available in MESC.
4
VALVE DETAILS
4.1
BY-ES A by-, when necessary, shall be fitted locally. If valves shall be supplied complete with by- 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 buying descriptions.
MESC ADDITIONAL REQUIREMENT
Revision: 13- Apr- 2005.
INT 77 / 001
4.3
Page 3 of 8.
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 the group.
4.5
SPARE PARTS FOR VALVES Spare parts for both valves and valve actuators shall be coded locally in sub groups 77.90 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 that may 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-class requirements 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).
MESC ADDITIONAL REQUIREMENT
Revision: 13- Apr- 2005.
INT 77 / 001
Page 4 of 8.
5.2
The breakdown per category is as follows:
5.2.1
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 and smaller
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 stop and check valves (copper alloy)
DN8 to DN 80
BS 5154
77/105
7.
Butterfly valves (resilient lined and soft seated)
DN50 to DN900
API 609, EN 593 or MSS SP67
77/106
8.
Plug valves
DN15 to DN600
BS 5353
77/107
9.
Diaphragm valves
DN15 to DN300
EN 13397 and BS 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 gate valves
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-set types)
DN40 and larger
API 609, EN593, MSS SP67, MSS SP68 or mfr std
77/134
16. Safety/relief valves, spring loaded, pilot operated.
DN 25-200 inlets DN 50-250 outlets
API 526
77/135
17. Incorporated in SPE 77/134 18. Rising stem non ball valves
77/136 DN 50 and larger
ISO 14313 (API 6D)
77/140
MESC ADDITIONAL REQUIREMENT
Revision: 13- Apr- 2005.
INT 77 / 001
5.2.2
Page 5 of 8.
19. Gate, globe and check valves (with pressure seal or breech lock bonnet)
DN50 to DN 600
ASME B16.34
77/160
20. Gate, globe and check valves (classes 1500, 2500 and 4500)
DN 15 to DN50
ASME B16.34
77/161
21. Gate, globe and ball valves (mono flange slim-line body)
DN50 and smaller
MFR STD
77/162
22. Cancelled and removed
77/163
23. Cancelled and removed
77/164
24. Integral double block and bleed valve assemblies.
DN50 and smaller
MFR STD
77/165
25. Integral double block and bleed valve assemblies
DN80 to DN250
MFR STD
77/166
26. Ball valves and check valves (lined).
DN15 to DN200
MFR STD
77/190
27. Ball valves, (small bore, high pressure).
DN15 to DN40
ASME B16.34
77/191
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 packing tolerances for specific service with tight fugitive emission requirements.
77/208
10. Valves in services between zero and minus 50ºC
77/209
11. Cancelled and removed
77/210
12. Valve stem and stem adapter dimensions and bracket drilling patterns for actuated quarter turn valves.
77/211
MESC ADDITIONAL REQUIREMENT
Revision: 13- Apr- 2005.
INT 77 / 001
5.2.3
Page 6 of 8.
III. Category C: Short Description
SPE
1.
Spare
77/300
2.
Cancelled.
77/301
3.
Materials, examination and certification requirements for valves in general services
77/302
4.
Materials, examination and certification requirements for valves in special services
77/303
5.
Cancelled and removed. Now included in SPE 77/302
77/304
6.
Cancelled and removed. Now included in SPE 77/303
77/305
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 Hydrogen Sulphide (H2S) services.
77/308
10. Production testing of soft seated gate valves used for double block 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 prototype and 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 of sealing 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
21. Cancelled and removed. Now included in SPE 77/302
77/320
MESC ADDITIONAL REQUIREMENT
Revision: 13- Apr- 2005.
INT 77 / 001
5.2.4
5.2.6
Page 7 of 8.
IV.
Category D:
Short Description
SPE
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 stainless steel 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
MESC additional requirements, are mandatory when referred to in a MESC description. A MESC description shall refer to only one specification from category "A". To complete the MESC buying description one or more additional requirements from categories “B”, "C" and/or “D” may be required (see example below). A MESC description and all additional requirements referred to shall be considered as a unit.
MESC ADDITIONAL REQUIREMENT
Revision: 13- Apr- 2005.
INT 77 / 001
5.2.7
Page 8 of 8.
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
SPE 77/102 GATE VALVE BS 1414
SPE 77/200 VALVE SERVICES BELOW MINUS 50°C
SPE 77/302 MATERIALS ACCEPTANCE REQ SPE 85103 GASKET SPW BS3381/ASME B16.20 SPE 77/306 PRODUCTION TESTING LOW TEMP
SPE 77/312 FUGITIVE EMISSION LEAK DETECTION
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 the Principal shall create locally coded (dot 9) MESC number(s) instead. However, as a good policy, adherence to the available standard description is essential to obtain the full benefits of standardisation and procurement co-ordination. Alternatively you may Shell Global Solutions International – GSEM-1.
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 alphabetical order, with the main body material and end connections at sub-group level followed by a breakdown per material type for the trim and service application at sub-sub group level. Valve additional requirements are presented in section 5. They reflect latest Shell policies and piping class requirements as well as present capabilities of valve manufacturers. Additional requirements which were used together with locally coded (dot 9) valves have 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, reference is made to 'design and engineering practice' publications DEP 31.38.01.12-gen and DEP 31.38.01.15-gen. These valves are incorporated in the MESC database.
3.
VALVE TYPES
3.1
ANGLE VALVES The application of angle type globe valves is not recommended and they have therefore not been included as a group standard with the exception of small size needle type globe valves for instrumentation purposes.
MESC ADDITIONAL REQUIREMENT
Revision: 13- Apr- 2005.
INT 77 / 001
Page 2 of 8.
3.2
BALL VALVES Ball valves are compact, have a positive shut-off and are easy to operate and maintain. 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 because of the polymers and elastomer seats and seals. Metal-seated valves shall be used for temperature ranges exceeding the ranges specified for soft-seated valves.
3.3
CAST-IRON AND DUCTILE IRON VALVES For safety reasons cast-iron valves shall not be used. A limited range of lined butterfly, diaphragm, ball and check valves with body materials made of ductile iron ion are included in MESC.
3.4
CHECK VALVES Check 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 VALVES Gate and globe (needle type) valves in the sizes DN40 and smaller are specified in EN ISO 15761. Globe (plug/ball type) valves are not available in sizes larger than DN 300.
3.6
HIGH PERFORMANCE BUTTERFLY VALVES High performance butterfly valves (HPBV) are included as an alternative to gate and ball valves, since lug and single flange HPBV offer space and weight savings. They are available as 'soft seated’, ‘metal/soft' and 'metal seated'. The recommended body styles are double flanged, lug and single flange.
3.7
PLUG VALVES The 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 VALVES Gate, globe and check valves with a pressure seal type bonnet/cover connection offers in-line maintainability as well as reduced weight (compared with flanged body/bonnet connections). Pressure seal type valves shall be used for steam services in the ASME pressure ratings 900 to 2500.
3.9
SLIM LINE GATE AND GLOBE VALVES Gate 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. In the higher-pressure ratings they offer space and weight savings as compared to the traditional valves. However, these valves are not yet available in MESC.
4
VALVE DETAILS
4.1
BY-ES A by-, when necessary, shall be fitted locally. If valves shall be supplied complete with by- 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 buying descriptions.
MESC ADDITIONAL REQUIREMENT
Revision: 13- Apr- 2005.
INT 77 / 001
4.3
Page 3 of 8.
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 the group.
4.5
SPARE PARTS FOR VALVES Spare parts for both valves and valve actuators shall be coded locally in sub groups 77.90 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 that may 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-class requirements 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).
MESC ADDITIONAL REQUIREMENT
Revision: 13- Apr- 2005.
INT 77 / 001
Page 4 of 8.
5.2
The breakdown per category is as follows:
5.2.1
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 and smaller
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 stop and check valves (copper alloy)
DN8 to DN 80
BS 5154
77/105
7.
Butterfly valves (resilient lined and soft seated)
DN50 to DN900
API 609, EN 593 or MSS SP67
77/106
8.
Plug valves
DN15 to DN600
BS 5353
77/107
9.
Diaphragm valves
DN15 to DN300
EN 13397 and BS 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 gate valves
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-set types)
DN40 and larger
API 609, EN593, MSS SP67, MSS SP68 or mfr std
77/134
16. Safety/relief valves, spring loaded, pilot operated.
DN 25-200 inlets DN 50-250 outlets
API 526
77/135
17. Incorporated in SPE 77/134 18. Rising stem non ball valves
77/136 DN 50 and larger
ISO 14313 (API 6D)
77/140
MESC ADDITIONAL REQUIREMENT
Revision: 13- Apr- 2005.
INT 77 / 001
5.2.2
Page 5 of 8.
19. Gate, globe and check valves (with pressure seal or breech lock bonnet)
DN50 to DN 600
ASME B16.34
77/160
20. Gate, globe and check valves (classes 1500, 2500 and 4500)
DN 15 to DN50
ASME B16.34
77/161
21. Gate, globe and ball valves (mono flange slim-line body)
DN50 and smaller
MFR STD
77/162
22. Cancelled and removed
77/163
23. Cancelled and removed
77/164
24. Integral double block and bleed valve assemblies.
DN50 and smaller
MFR STD
77/165
25. Integral double block and bleed valve assemblies
DN80 to DN250
MFR STD
77/166
26. Ball valves and check valves (lined).
DN15 to DN200
MFR STD
77/190
27. Ball valves, (small bore, high pressure).
DN15 to DN40
ASME B16.34
77/191
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 packing tolerances for specific service with tight fugitive emission requirements.
77/208
10. Valves in services between zero and minus 50ºC
77/209
11. Cancelled and removed
77/210
12. Valve stem and stem adapter dimensions and bracket drilling patterns for actuated quarter turn valves.
77/211
MESC ADDITIONAL REQUIREMENT
Revision: 13- Apr- 2005.
INT 77 / 001
5.2.3
Page 6 of 8.
III. Category C: Short Description
SPE
1.
Spare
77/300
2.
Cancelled.
77/301
3.
Materials, examination and certification requirements for valves in general services
77/302
4.
Materials, examination and certification requirements for valves in special services
77/303
5.
Cancelled and removed. Now included in SPE 77/302
77/304
6.
Cancelled and removed. Now included in SPE 77/303
77/305
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 Hydrogen Sulphide (H2S) services.
77/308
10. Production testing of soft seated gate valves used for double block 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 prototype and 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 of sealing 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
21. Cancelled and removed. Now included in SPE 77/302
77/320
MESC ADDITIONAL REQUIREMENT
Revision: 13- Apr- 2005.
INT 77 / 001
5.2.4
5.2.6
Page 7 of 8.
IV.
Category D:
Short Description
SPE
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 stainless steel 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
MESC additional requirements, are mandatory when referred to in a MESC description. A MESC description shall refer to only one specification from category "A". To complete the MESC buying description one or more additional requirements from categories “B”, "C" and/or “D” may be required (see example below). A MESC description and all additional requirements referred to shall be considered as a unit.
MESC ADDITIONAL REQUIREMENT
Revision: 13- Apr- 2005.
INT 77 / 001
5.2.7
Page 8 of 8.
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
SPE 77/102 GATE VALVE BS 1414
SPE 77/200 VALVE SERVICES BELOW MINUS 50°C
SPE 77/302 MATERIALS ACCEPTANCE REQ SPE 85103 GASKET SPW BS3381/ASME B16.20 SPE 77/306 PRODUCTION TESTING LOW TEMP
SPE 77/312 FUGITIVE EMISSION LEAK DETECTION
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 the Principal shall create locally coded (dot 9) MESC number(s) instead. However, as a good policy, adherence to the available standard description is essential to obtain the full benefits of standardisation and procurement co-ordination. Alternatively you may Shell Global Solutions International – GSEM-1.
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