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Volume-II of IV - GAIL

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MECON LIMITED<br />

Delhi<br />

PROCESS & PIPING<br />

DESIGN SECTION<br />

TECHNICAL SPECIFICATION<br />

FOR<br />

FLANGES AND WELDED FITTINGS<br />

(SIZE 450mm (18”) NB AND ABOVE)<br />

TECHNICAL SPECIFICATION NO. : MEC/TS/05/62/026 REV-0 PAGE 2 OF 9<br />

1.0 SCOPE<br />

This specification covers the minimum requirements for the design,<br />

manufacture and supply <strong>of</strong> following items to be installed in pipeline<br />

system handling hydrocarbons in liquid or gaseous phase :<br />

• Carbon Steel Welded Fittings 450mm (18”) NB and above, such as<br />

tees, elbows, reducers and caps.<br />

• Carbon Steel Flanges 450mm (18”) NB and above, such as welding<br />

neck flanges and blind flanges.<br />

This specification does not cover the above mentioned items which are to<br />

be installed in pipeline system handling sour hydrocarbons (liquid/ gas)<br />

service as defined in NACE Standard MR-01-75.<br />

2.0 REFERENCE DOCUMENTS<br />

2.1 Reference has been made in this specification to the latest edition <strong>of</strong> the<br />

following Codes, Standards and Specifications:<br />

a) ASME B31.8 - Gas Transmission and Distribution Piping<br />

Systems<br />

b) ASME B31.4 - Pipeline Transportation Systems for Liquid<br />

Hydrocarbons, Liquid Petroleum Gas,<br />

Anhydrous Ammonia and Alcohols<br />

c) ASME B16.5 - Steel Pipe Flanges and Flanged Fittings<br />

d) ASME B16.9 - Factory Made Wrought Steel Butt Welding<br />

Fittings<br />

e) ASME B16.47 - Large Diameter Steel Flanges<br />

f) ASME B16.25 - Butt-welding Ends<br />

\\Akjha\work contrac\standard TS for Pipe Line WC (Vol-<strong>II</strong>) MASTER FOLDER\26 flange & welded fittings 18 inch & above\Specification for Flanges & Welded Fittings 26.doc

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