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 3 OF 10
RAILROADS, MINOR WATER AND
OTHER CROSSINGS MEC/S/05/62/05 REVISION 0
• Working method with equipment
• Test procedure
• Manpower deployment
• Calculations of temporary works
• Soil investigations, etc.
Such works shall be without any extra cost to COMPANY.
2.3 Pipeline crossings for road, railroad, canals and rivers etc., shall be
hydrostatically pretested ex-situ, prior to joint coating, whenever,
• Crossing is executed by boring ;
• Crossing is installed in casing pipe;
• River crossing pipes which are to be continuously concrete weight coated
(to be tested prior to concrete coating);
• Whenever, in COMPANY's opinion, the repair of pipeline at crossing, in
case of a leak during final hydrostatic testing, would require inordinate
amount of effort and/ or time;
• Whenever pretesting is insisted upon by the Authorities having
jurisdication over the utility crossed.
The section of the pipeline for the crossings shall be tested as a single string.
Unless specified otherwise in the CONTRACT, the test pressure shall be the
one resulting in a hoop stress corresponding to 90% of SMYS of pipe material.
Test pressure shall be retained in the pipeline for minimum period of 2 hours.
Test section shall be visually examined for leaks/ defects, etc.
3.0 ROAD AND RAILROAD CROSSINGS
3.1 The work under crossings shall include necessary clearing, grading and
trenching to required depths and widths, welding of casing (when required) and
carrier pipes, coating, lowering-in, backfilling, clean-up, restoration to the original
condition and further strengthening and protective works, testing, installation of
assemblies, insulators and seals, and temporary works such as sheet pilling,
bridges, etc.
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