Volume-II of IV - GAIL

MECON LIMITED
Delhi
PROCESS & PIPING
DESIGN SECTION
TECHNICAL SPECIFICATION FOR
TEMPORARY CATHODIC
PROTECTION SYSTEM
TECHNICAL SPECIFICATION NO. : MEC/TS/05/62/016A REV-1 Page 2 of 19
NACE publications
IEC publications
DNV publications
IEEE publications
DIN publications
ASTM publications
In case of conflicting requirements amongst any of the above standards the
publication having most stringent requirement shall be governing.
3.0 CORROSION DATA
3.1 The corrosion survey including soil resistivity data along ROW and other data required
for CP design is attached with this document. However, verification of its veracity and
adequacy shall be the entire responsibility of the contractor. In addition, contractor
shall have to generate/ collect additional data as required for completeness of the job.
Contractor shall also carry out soil resistivity survey at temporary mode ground bed
locations for proper design of ground beds. Wenner's 4-pin method or approved equal
shall be used for such measurements. Survey instruments shall have maximum AC and
DC ground current rejection feature.
3.2 Additional data to be collected
The following data shall be collected to generate design data for evaluation of
interaction/ interference possibilities due to presence of other services in ROW/ in
vicinity.
i. Route and types of foreign service/pipeline in and around or crossing the right
of way (including those existing and those which are likely to come up during
contract execution or any abandoned pipelines.
ii. Diameter, wall thickness, pressure, pipeline coating against corrosion, soil
cover used in case of pipelines.
iii. Detail of the existing cathodic protection system protecting the services i.e.
location, rating, type of protection, anode beds, test station locations and their
connection schemes.
iv. Graphical representation of existing structure/ pipe-to soil potential records.
T/R unit current/ voltage readings.
v. Remedial measures existing on foreign pipeline/services to prevent interaction.
vi. Possibility of intergration/isolation of CP system, Which may involve
negotiations with owners of other services.
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