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 31 OF53
MEC/S/05/62/01 REVISION A
8.1.6 Repair of damaged pipe ends by hammering and/or heating is not allowed. If the
dented area is minor and at least 200mm away from the pipe end, and the steel
is not stretched, severed, or split in the COMPANY's opinion, the pipe may be
straightened with a proper jack.
8.2 Pipe Handling And Skid Spacing
8.2.1 When lifting pipe, care must be taken not to kink or overstress it. Proper pipe
slings approved by COMPANY shall be used. CONTRACTOR shall submit his
method of skidding and skid spacing for COMPANY's approval. A strip of soft
material shall be placed in between skid and pipe to protect the external coating
of the pipe. The material shall be approved by the COMPANY.
8.2.2 The maximum skid spacing is not allowed before the stringer bead and the top
and bottom reinforcements are completed, provided that the distance between
the incomplete weld and the skid shall not exceed 9 (nine) percent of the skid
spacing.
8.2.3 Skids shall be atleast 1.20 meter long. For pipe with an O.D. of 12-3/4 inch and
larger the skids in contact with the pipe shall have a width of at least 200mm.
For pipe with an O.D. of less than 12 inch the skids in contact with the pipe shall
have a width of atleast 150mm. Pipe supports shall be stable, so that pipe
movement will not cause the supports to move. Skids shall not be removed
under a string before lowering in. The welded pipe shall be maintained on skids
at the minimum distance of 500mm above ground. Crotches shall be installed at
frequent intervals (atleast every 10th support) with a greater number required at
bends and undulation grounds.
8.3 Night Caps
At the end of each day's work or every time when joining and welding operations
are interrupted, the open ends on the welded strings of pipes shall be capped
with a securely closed metal cap or plug as approved by COMPANY so as to
prevent the entry of dirt, water, or any foreign matter into the pipeline. These
covers shall not be removed until the work is to be resumed. The caps/plugs
used shall be mechanical type and shall not be attached to pipe by welding or
by any other means which may dent, scratch or scar the pipe.