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 4 OF 10
RAILROADS, MINOR WATER AND
OTHER CROSSINGS MEC/S/05/62/05 REVISION 0
The work shall be carried out in accordance with the approved drawings and job
standards, as directed by COMPANY and to the satisfaction of COMPANY and
the authorities having jurisdication over th facility crossed. The work carried out
for road and railroad crossings shall meet the minimum requirements of API RP
1102, latest edition.
Before the installation work of crossings is started, the CONTRACTOR shall
provide suitable barricades, temporary bridge/ bypass work (especially where
roads are open-cut) with railing, if required by COMPANY for safety of traffic.
Adequate traffic warning signals and/ or traffic lights and suitable diversions shall
be provided as directed by COMPANY/ Authority having jurisdication over these
areas. Such diversions shall not cross the pipeline where it has already been
installed, unless proper safeguarding in COMPANY's opinion is ensured.
Prior approval from the statutory authorities shall be obtained to lay the pipeline
across highways/ roads either by boring or by open-cut method. Installation of
the crossing shall be by the method (i.e., boring/ open-cut) approved by
Authorities having jurisdiction. Railroad crossings shall always be bored/ jacked.
3.2 Boring/ jacking of carrier pipes for crossings is allowed only if the pipes for
boring/ jacking are provided with a suitable corrosion coating and
CONTRACTOR remains liable for the suitablity of the pipe and weld-coating of
carrier pipes to be bored and for which coating and method of application are
anyhow to be authorised by COMPANY without prejudice to CONTRACTOR's
liability. In all other cases the carrier pipes shall be cased.
Before start of the boring/ jacking CONTRACTOR shall execute a soil
investigation and determine the ground water table. Based on these
investigations CONTRACTOR shall prepare a construction drawing and submit
to COMPANY for approval including time schedule and soil investigation report.
The CONTRACTOR shall submit for approval of COMPANY the method of
boring / trenchless to be carried out, depending on the nature of soil conditions,
nature of crossing, local requirements etc.
During the execution of boring the ground water table over the length of the
boring shall be lowered up to atleast 0.50 M below bottom of the pipeline. This
water table is to be regularly inspected and maintained by CONTRACTOR and
reported to COMPANY. To safeguard the stability of the borepit, CONTRACTOR
shall, if necessary in COMPANY's opinion, use a closed sheetpiling which shall
extend atleast over 50% of the length in undisturbed soil. The length of the
boring shall be in accordance with the length of the ROW of the crossing (road,
railroad, etc.) with minimum 0.6 m extra on either side.
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