standard specification for erection tender - GAIL

egulators shall have flanged end connection integral to the valve body.
2.2.2 The valve/regulator body rating shall be equal to or better than the flange rating
specified in the data sheet.
2.2.3 The valve/ regulator shall be suitable for installation in horizontal as well as
vertical lines.
2.2.4 Flow direction shall be clearly stamped or cast on the valve / regulator body to
ensure correct installation.
2.2.5 End Connection
2.2.5.1 Unless otherwise specified, the end connection details shall be as below;
a) Threaded end connections shall be to NPT as per ANSI/ASME B1.20.1.
b) Flanged end connection shall be as per ANSI/ASME B 16.5.
c) Flange face finish shall be as per clauses 6.4.4.1, 6.4.4.2 and 6.4.4.3 of ANSI /
ASME B16.5. The face finish as specified in data sheets, shall have serrations as follows:
125AARH : 125 TO 200 AARH
63AARH : 32 to 63 AARH
d) Ring type joint flanges shall have octagonal grooves as per ANSI B16.20.
2.2.5.2 Face-to-face dimensions of self actuated control valve / regulators with
flanged globe body design shall be in accordance with ISA S-75.03. The allowable error
in dimensions shall be + 2mm.
2.2.5.3 Bottom drains shall be plugged or blind flanged. Wherever plug is used,
threads shall correspond to ANSI/ ASME B1.20.1.
2.3 Trim
2.3.1 The term 'trim' covers those parts of a body assembly (excluding the body,
diaphragm and bottom flange), which are exposed to and in contact with the line
medium, consisting of but not limited to the seat ring, plug stem, plug, plug guide, guide
bushing and cage.
2.3.2 Guiding
2.3.2.1 The self actuated control valve / regulator guiding shall be as per manufacturer
standard. However, for globe body design of self actuated control valves / regulators
following shall govern:
a) Single seated valves shall have top guiding.
b) Double seated valves shall have top and bottom guiding and shall be of the pressurebalanced
design.
2.3.2.2 Guide bushing shall be of sufficiently hard material to resist side thrust on
the plug.
2.3.3 Material of construction
2.3.3.1 Unless specified otherwise, the trim material for all offered self actuated control
valves / regulators shall be 316 Stainless Steel.
2.3.3.2 Wherever stelliting of trim has been specified in purchaser's data sheets it stands
for stelliting of the complete plug and seat joint, orifice and plug contour unless specified
GAIL (INDIA) LTD
NEW DELHI
STANDARD SPECIFICATION FOR SELF
ACTUATED CONTROL VALVES /
REGULATORS
SPECIFICATION REV-0
S-08-02-007
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