Volume-II of IV - GAIL

MECON LIMITED
REGD. OFF: RANCHI (BIHAR)
PROCESS & PIPING
DESIGN SECTION
NEW DELHI
TITLE PIPING FABRICATION AND
ERECTION
10.0 GENERAL
WELDING SPECIFICATION
STANDARD SPECIFICATION
SPECIFICATION NO. PAGE 10 OF 62
MEC/S/05/62/06 REVISION 0
ANNEXURE-1
This specification shall be followed for the fabrication of all types of welded joints
of carbon steel above ground natural gas service piping systems.
The welded pipe joints shall include the following :
a) All line pipe joints of the longitudinal and circumferential butt welded.
b) Attachments of castings, forgings, flanges.
c) Welded manifold headers and other sub-assemblies
d) Welded branch connections with or without reinforcing pads.
e) Joints in welded/ fabrication piping components.
f) The attachments of smaller connections for vents drain drips and other
instrument tappings.
Any approval granted by the Engineer-in-charge or owner's inspectors shall not
relieve the contractor of his responsibilities & guarantees.
1.1 Applicable Codes & Standards
All welding work, equipments for welding, heat treatment, other auxiliary
functions and the welding personnel shall be as per the requirements of the
latest editions of the following approved standards and procedures :-
i) Code for gas transmission and distribution piping systems. ANSI B31.8.
ii) Code for petroleum refinery piping, ANSI B31.3.