Volume-II of IV - GAIL

MECON LIMITED
DELHI
D:\old data\FATEH\MP Region\Kailaras\Tender RFQ\Globe Valve\TS - Globe Valve.doc
PROCESS & PIPING
DESIGN SECTION
TECHNICAL SPECIFICATION
TITLE GLOBE VALVES SPECIFICATION NO. PAGE 4 OF 11
3.0 DESIGN AND CONSTRUCTION
MEC/TS/05/62/005 REVISION 0
3.1 Valves shall be designed, manufactured, tested, inspected and marked as per
the manufacturing standards design codes and standards (Latest editions)
indicated in the respective valve specification sheets. Any conflict between the
the technical specifiction, specification sheets and referred standard codes shall
be brought to the notice of the purchaser for clarifications, but generally
technical specification, data sheets shall govern. No deviation to specification/
standard shall be permitted through vendor drawings approval. Approval of
drawings shall be valid only for design features.
3.2 Bonnet extension wherever specification the valve sheet to BS : 6364 shall be
for “Non Cold Box Application” unless otherwise specified in the requisition.
Even if not called for in valve sheet, valves indicated as ‘CRYO’ shall be
supplied with bonnet extension.
3.3 For heavy valves provisions shall be available for lifting by way of lugs, eye
bolts and such standard devices.
3.4 All flanged valves shall have flanges integral (except forged valves) with the
valve body. Flange finish shall be as per valve specification sheet.
3.5 For all weld end valves with bevel end as per ANSI B16. 25.
The contour of bevel shall be as follows :
Material Wall Thickness Weld Contour
Carbon steel upto 22 mm figure 2 type A
(Except low temp. > 22 mm figure 3 type A
carbon steel )
Alloy steel, upto 10 mm figure 4
Stainless steel & > 10 mm to 25 mm figure 5 type A
low temp. carbon steel > 25 mm figure 6 type A
3.6 If an overlay weld-deposit is used for the body seat ring and seating surface,
the seat ring base material shall be at least equal to the corrosion resistance of
the material of the shell.