Volume-II of IV - GAIL

5.0 TESTS ON SOIL SAMPLES
Soil/ water samples shall be collected along the right of way for
analysis. Samples shall be collected on an average at one location per
every 10 km along right of way with minimum at two locations. Exact
locations shall be decided at site depending on the type of soil, soil
resistivity and in consultation with Owner or his representative. The
soil samples shall be collected at 1 mtr and 2 mtr depth at each
location.
The collected soil/ water samples shall be analysed to determine
presenceand percentage of corrosive compounds including moisture
content, oxygen activity and pH value.
6.0 ADDITIONAL DATA COLLECTION
The following data shall be collected with a view to generate design
data of evaluation of cathodic protection interaction possibilities due to
presence of other services in right of way and its vicinity.
6.1 Route and types of foreign service/ pipelines in and around or crossing
the right of way.
6.2 Diameter, wall thickness, pressure, soil cover etc. of the foreign
pipeline.
6.3 Voltage rating, phases and sheathing details of parallel running or
crossing cables with ROW.
6.4 Foreign pipeline coating details.
6.5 Details of exiting cathodic protection systems protecting the services
including rating and location of grounds bed test station locations and
connections schemes etc. Where pipeline is likely to pass close to any
existing ground bed, necessary anode-bed potential gradient survey
shall be carried out.
6.6 Interference remedial measures existing on foreign pipelines/ services/
shall be collected from the owner of the foreign pipeline/ services.
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