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 10 OF 10
RAILROADS, MINOR WATER AND
OTHER CROSSINGS MEC/S/05/62/05 REVISION 0
The excavation shall be trimmed in steps-and-berms backfilled with well
compacted solid soil, followed by a minimum 0.25m thick layer of properly
shaped boulders (75-150mm) encased in a net of galvanised iron wire of dia
3mm spaced at a maximum distance of 50mm to be laid over the backfilled,
compacted and graded banks.
The GI wire shall be made from steel having tensile strength of 400 N/mm 2 and
with a minimum elongation at failure of 10%. The minimum zinc coating of 200
gm -2 shall be applied on single/ double twisted wire.
The length of the above protection shall be equal to the actual bank excavation
edge including damage and extending 2m on either sides. The width of this
protection on the slope shall be determined by the following :
• 2m plus the highest water level (recoverable) or upto the top of bank
whichever is higher.
• Upto the bottom of the crossing or 20m below the highest water level
whichever is smaller.
Bank stabilisation for certain minor water crossings shall be determined by
COMPANY based on nature of crossing e.g. type of river, canal, major nallah,
flood control banks and other water bodies; type of soil, regulations of local
authorities; and any other socio-economic consideration evaluated by the
COMPANY.
5.12 The crossing of any embankments shall be carried out strictly in accordance with
approved drawings.
No drilling work on embankments shall be permitted without prior written
approval from the competent authorities.
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