Volume-II of IV - GAIL

6.0 GAUGE PIG RUN
Contractor to carry out adequate number of gauging pig runs in each
pipeline covered under Scope of work including pig tracking for pipeline to
assess any internal restriction in the pipeline that may restrict the passage
of cleaning and caliper pig. Contractor to provide detailed daily site report
for each run in the approved format before commencing the subsequent
run Gauge pig shall be equipped with a gauge plate made of Aluminium
having its diameters 95% of minimum pipeline Internal Diameter (I.D.).
The gauge pig should be able to pass over or negotiate lateral tees or
bends on the pipeline.
7.0 CLEANING PIG RUN
7.1 Pipelines with Internal Coating
Contractor to carry out adequate number of cleaning pig runs by running
suitable cleaning pigs in the pipelines including pig tracking till such time
contractor is satisified with himself about the degree of cleanliness of
pipeline and provide detailed daily site report for each run in the approved
format before commencing the subsequent run. Choice of the type of
cleaning pig has been left to the contractor. The contractor shall assure
that the pigs, which are proposed to be used, are adequately soft and
they do not damage internal coating under any circumstances. The
brushes and scrappers used shall be of nonmetallic/ plastic material.
However, the details of these pigs including their construction details of
brushes, scrappers etc. (if applicable) shall be submitted to MECON/ GAIL
for approval before their usage.
7.2 Pipelines Without Internal Coating
CONTRACTOR to carry out adequate numbers of cleaning pig runs by
running suitable cleaning pigs in pipeline covered under SCOPE OF WORK
including pig tracking till such time CONTRACTOR is satisfied with himself
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