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 46 OF 53
MEC/S/05/62/01 REVISION A
12.4.4 The in-line inserting shall be made on the buried pipeline; care shall be taken to
operate at an external temperature as close as possible to the pipeline operating
temperature.
The joints shall be inserted on straight sections and laid on a fine sand bed.
12.4.5 During the execution of the in-line connection welding, the propagation of heat
shall be avoided. To achieve this, the joint shall be kept cold by means of nags
continuously wetted.
12.4.6 Insulating joints shall be electrically tested before welding into the pipeline. The
electrical conductance test shall be carried out using a Megger. Measurement of
the insulation resistance across the joints shall be approx. one (1) Mega Ohm.
The tests shall be repeated after installation and welding of the joint into the
pipeline to verify that the assembly is undamaged.
13.0 WORKING SPREAD LIMITATIONS
CONTRACTOR shall, in general, observe the following maximum distances
between the working mainline spread:
Between ROW grading, clearing and backfilling :40 Kms
Between backfilling and final clean-up :15 Kms
The above limitations do not apply to point spreads such as continuous rock
blasting, river crossing, etc.
Any deviations from the above shall require prior approval of COMPANY.
COMPANY reserves the right to stop the work, in case the approved spread
limitations are exceeded and CONTRACTOR shall not be paid any
compensation for stoppage of work.
14.0 CLEAN-UP AND RESTORATION OF RIGHT OF WAY
14.1 CONTRACTOR shall restore the ROW and all sites used for the construction of
pipelines, water crossing and other structures in accordance with COMPANY's
instructions, and deliver them to the satisfaction of COMPANY.