Volume-II of IV - GAIL

MECON LIMITED
Delhi
PROCESS & PIPING
DESIGN SECTION
TECHNICAL SPECIFICATION FOR
PERMANENT CATHODIC
PROTECTION SYSTEM
TECHNICAL SPECIFICATION NO. : MEC/TS/05/62/016B REV-1 Page 2 of 24
IEEF publications
DIN publications
In case of conflicting requirements amongst any of the above standards, the
publication having most stringent requirement shall be governing.
3.0 SYSTEM IMPLIMENTATION
All work to be performed and supplies to be effected as a part of contract shall require
specific approval of owner or his authorised representative. Major activities requiring
approval shall include but not limited to the following :
a) Corrosion survey data interpretation report and plot plans for land acquisition.
b) Conceptual system design.
c) Basic engineering package.
d) Purchase requisition for major equipment and vendor approval.
e) Detailed engineering package.
f) Field testing and commissioning procedures.
g) Procedures for interference testing and mitigation.
h) As built documentation.
i) CPL survey procedure.
4.0 CORROSION SURVEY
4.1 General
4.1.1 The details of corrosion survey including soil resistivity data along the right of way and
other data required for CP design are attached with this specification. 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
required for completeness of the job.
4.1.2 To carry out soil resistivity measurement (at pipeline depth) Wenner’s 4-pin method or
an equivalent method approved by owner shall be used. Survey instruments shall have
maximum AC and DC ground current rejection feature.
4.2 Soil resistivity survey at impressed current anode ground bed plot
4.2.1 Each selected anode bed plot shall be sub- divided into sub-plots. Sizes of sub-plots
shall depend upon the expected depth for soil resistivity investigations. Each of these
sub-plots shall be investigated for restivity data individually. Sufficient observations
shall be taken at each of these sub-plots as required and desired by Owner/ Owner’s
representative to obtain sufficient information about sub- soil stratification and,
wherever possible, to establish the depth of water table/ basement. The number of
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