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 20 OF 53
MEC/S/05/62/01 REVISION A
Care shall be exercised to see that fresh soil recovered from trenching
operation, intended to be used for backfilling over the laid pipe in the trench, is
not mixed with loose debris or foreign material. The excavated material shall
never be deposited over or against the strung pipe.
6.2.2 In steep slope area or on the hillside, before commencing the works, proper
barriers or other protection shall be provided to prevent removed materials from
rolling downhill.
6.2.3 On slopes where there is danger of landslide, the pipeline trench shall be
maintained open only for the time strictly necessary. Forever, the COMPANY
may require excavation of trench by hand, local route detours and limiting the
period of execution of the works.
6.2.4 In certain slope sections before the trench cuts through the water table, proper
drainage shall be ensured both near the ditch and the Right-of-Way in order to
guarantee soil stability.
6.2.5 All sewers, drains ditches and other natural waterways involved in the execution
of the works shall be maintained open and functional. The same applies to
canals, irrigation canals, pipelines and buried facilities crossed by the ditch for
which temporary pipeline shall be laid, if required, and proper temporary
installations provided.
6.3 Blasting
Blasting for trenching and the related removal of scattered rock and debris
caused by the blasting from the Right-of-Way and/or adjacent property, shall be
performed by CONTRACTOR as part of his work.
Every possible precaution shall be taken to prevent injuries and damages to
persons and properties during blasting operations, which shall be performed in
accordance with Standard Rules for Blasting.
CONTRACTOR shall obtain necessary permits for storage and use of
explosives and comply with the laws, rules and regulations of the respective
Governmental agencies having jurisdiction thereof. No blasting will be allowed
without prior and due notice given by CONTRACTOR to COMPANY,
Government authorities, land-owners, property occupants, adjacent work crew,
and other concerned parties.