Volume-II of IV - GAIL

MECON LIMITED
REGD. OFF : RANCHI (BIHAR)
PROCESS & PIPING
DESIGN SECTION
NEW DELHI
STANDARD SPECIFICATION
TITLE PIPELINES CROSSING ROADS, SPECIFICATION NO. PAGE 9 OF 10
RAILROADS, MINOR WATER AND
OTHER CROSSINGS MEC/S/05/62/05 REVISION 0
CONTRACTOR shall take special care to check with the responsible authorities
for special conditions applying to working on, over, under or through minor water
crossings and CONTRACTOR shall comply with any such conditions. Written
arrangements with authorities shall be drawn up in cooperation with COMPANY.
5.7 For crossings beneath the bed of water courses, the pipe section shal be made
in such a way that it conforms to the existing or future bed as indicated in the
approved drawings. In crossings for which an individual drawing has not been
prepared, the minimum cover of the pipeline shall not be less than that indicated
in the standard drawings for a similar type of crossing.
5.8 Whenever the crossing requries a straight section of pipe between the lower
bends coinciding with the river bed, this section shall be laid at a single
horizontal level.
5.9 For crossings of ditches, canals, banked channels, etc. by boring, the pipe
section shall be prepared, laid and tested in accordance with the applicable
clauses of Section 3.0 of this specification.
5.10 The CONTRACTOR shall arrange temporary installation of diversions as may
be necessary, to ensure the effective functioning of these water courses
crossed, to the entire satisfaction of the concerned Local Authorities as well as
the COMPANY.
5.11 Banks and trenches of minor water crossings shall be backfilled with soil which
is to be approved by COMPANY and shall be thoroughly compacted to prevent
soil and bank erosion as per the drawings and standards to the satisfaction of
authorities having jurisdication thereof and the COMPANY. Whenever boulders,
rock, gravel and other hard objects are encountered, they shall not be placed
directly on the pipe. Sufficient earth, sand or selected and approved backfill
material shall be backfilled initially around and over the pipe to provide a
protective padding or cushion extending to a minimum thickness of 30
centimeters around the pipe before backfilling remainder of the trench with
excavated or other material as per approved drawings and standards.
After the trench has been backfilled and during the clean up works, the minor
water crossing shall be cleaned at least across the whole of the ROW.
When directed by the COMPANY, CONTRACTOR shall stabilise and restore
the bank of the water crossings with materials to be supplied by him as follows.
\\Akjha\work contrac\standard TS for Pipe Line WC (Vol-II) MASTER FOLDER\05 pipeline crossing road,railroad , minor water etc\PCR-MWC final-1 05.doc