Volume-II of IV - GAIL

MECON LIMITED
Delhi
PROCESS & PIPING
DESIGN SECTION
TECHNICAL SPECIFICATION
FOR
PLUG VALVES
TECHNICAL SPECIFICATION NO. : MEC/TS/05/62/003 REV-2 Page 3 of 13
MSS-SP-44 : Steel pipeline flanges
SSPC-VIS-1 : Steel structures painting council-visual standard
2.3 In case of conflict between the requirements of this specification, API 6D and the
Codes, Standards and Specifications referred in clause 2.2 above, the requirements of
this specification shall govern. Order of precedence shall be as follows :
• Data Sheets
• This Specification
• API 6D Specification
• Other Referred Codes & Standards
• Manufacturer’s Standard
3.0 MATERIALS & TEST PROCEDURES
3.1 Material for major components of the valves shall be as indicated in Valve Data Sheet.
Other components shall be as per Manufacturer's standard which will be subject to
approval by Purchaser.
3.2 Carbon steel used for the manufacture of valves shall be fully killed.
3.3 Chemical composition (check analysis) of valve end connection which are subject to
further welding by Purchaser shall meet the following requirements for each heat of
steel used:
a) Carbon : 0.22% (max.)
b) Manganese : 1.70 % (max.)
c) Silicon : 0.55 % (max.)
d) Phosphorus : 0.030 % (max.)
e) Sulphur : 0.030 % (max.)
Total percentage of Vanadium, Niobium and Titanium shall not exceed 0.20. Residual
elements shall not exceed the following limits :
a) Nitrogen : 0.019 %
b) Nickel : 0.30 %
c) Copper : 0.20 %
d) Aluminum : 0.070 %
e) Chromium : 0.15 %
f) Molybdenum : 0.05 %
Carbon equivalent (CE) as calculated by the following shall not exceed 0.45%.
Mn Cr + Mo + V Ni + Cu
CE = C + -------- + ---------------------- + ---------------
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D:\old data\FATEH\MP Region\Kailaras\Tender RFQ\Plug Valves\Plug Valves - 003 - TS-R2.doc