Pipelaying Tender-VOL IV - WorleyParsons.com

EPMC SERVICES FOR REWARI – KANPUR PIPELINE
SPECIFICATION FOR PIPELINE CONSTRUCTION
4.13.3 Whenever the bottom of the trench contains projecting rocks which might damage the pipe or
coating, the bottom of the trench shall be padded with a minimum of 4" (102 mm) of sand or soft soil to
be furnished and installed by CONTRACTOR, all of which shall be approved by OWNER.
4.13.4 The pipe shall be lowered into the trench as soon as the coating has hardened sufficiently so
that the lowering will not cause holidays. This shall be checked by picking the pipe up after it has been
lowered in and checking with a holiday detector. If this check shows holidays, the pipe must be lowered
to skids until it has had sufficient time to properly harden.
4.13.5 Wide non-abrasive slings, belts, or rubber tire and cradles shall be used in all lowering of the
pipeline. The CONTRACTOR shall lower line in such a manner as to provide sufficient slack and to the
satisfaction of OWNER. The line shall not be dropped or subjected to jar or impact.
4.13.6 All coated and wrapped pipe, which has been supported in any manner, shall be subjected to
close inspection and checked with a holiday detector to see that the coating is undamaged and if found
damaged shall be patched.
4.13.7 CONTRACTOR shall furnish sufficient proper equipment during the lowering-in operation to
prevent bending of the pipe or damage to coating.
4.13.8 Where ditch is excavated in rock, padding will be provided as specified in Clause 4.19 and 4.20
entitled "Rock Trench and Earth Padding".
4.13.9 Where multiple lines are installed in a common ditch, a minimum of 6 inch (15 cm) spacing shall
separate the individual lines. Individually placed mounds of earth at approximately 20 foot (6 m)
intervals shall be placed in the ditch between the lines prior to backfilling to assure separation of the
lines.
4.14 Backfill
This shall include all work necessary to backfill excavated material in the ditch, and restore creek
banks, hillsides, or other places where the right-of-way has been graded.
4.14.1 Immediately after the pipe has been lowered, it shall be weighted by filling the ditch over the
pipe with backfill material. After the ditch has been filled to the level of surrounding ground, one tread
of a heavy tractor shall run over backfill to pack the backfill. This tamping operation is not to be done
through rocky land where the coating might be damaged or through sections where drainage tile is
encountered and might be damaged. After the above tamping operation, the remaining backfill shall be
spread over the pipeline ditch in a manner acceptable to the OWNER and the land owner.
4.14.2 Pipe, fittings, or appurtenances shall not be backfilled unless the pipe has the proper fit and the
required cover and has been approved for backfill by OWNER.
4.14.3 Where the pipe has been laid under streets, sidewalks, or railroads, backfill shall be done as set
out in Clause 4.17 entitled Highway and Railway Crossings.
n:\513-mh-2145-rkpl\11 engineering\11.8 pipelines\06 spec\specification for pipeline construction\mh2145-c000-
pl-spc-0001.doc
MH2145-C000-PL-SPC-0001 RevA Page 21 of 32