Volume-II of IV - GAIL

MECON LIMITED
REGD. OFF : RANCHI (BIHAR)
Document6
PROCESS & PIPING
DESIGN SECTION
NEW DELHI
TITLE MAINLINE CONSTRUCTION
(ONSHORE)
STANDARD SPECIFICATION
SPECIFICATION NO. PAGE 19 OF 53
MEC/S/05/62/01 REVISION A
Beside recording the stamped - in pipe numbers, length of pipe and painted-on
serial numbers, the stamped-in numbers of T-pieces, bends, valves, etc. and the
batch numbers of bends, T-pieces, valves, etc. and the make of valves, shall
also be recorded in said list.
Before a pipe length, pipe end, etc. is cut the painted serial number and
stamped-in pipe number shall be transferred by CONTRACTOR in the presence
of COMPANY to either side of the joint which is to be made by cutting, and the
changes shall be recorded in the above mentioned list stating the (new) length.
The results shall be such that all pipes, pups, etc. of diameter greater than 2"
bear clear marks painted on.
CONTRACTOR shall explicitly instruct his staff that parts which cannot be
identified must not be removed, except after permission by COMPANY.
As a general rule parts must be marked as described above before being
moved. In no conditions may unmarked parts be incorporated into the WORK.
6.0 TRENCHING
6.1 Location
6.2 Excavation
CONTRACTOR shall, excavate and maintain the pipeline trench on the staked
center line of the pipeline taking into account the curves of the pipeline.
6.2.1 CONTRACTOR shall, by any method approved by COMPANY, dig the pipeline
trench on the cleared and graded Right-of-Way. In cultivable land and other
areas specifically designated by the COMPANY, top 60mm of the arable soil on
the pipeline trench top and 500mm on either side shall be excavated and stored
separately to be replaced in original position after backfilling and compacting
rest of the trench.
Suitable crossing shall be provided and maintained over the open ROW where
necessary, to pemit general public, property owners or his tenants to cross or
move stock or equipment from one side of the trench to the other.