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 17 of 19
to the pipeline then investigation shall be made for current discharge points on both
the pipelines.
Mitigation measured shall be provided depending on type of interference. These shall
include installation of bond with variable resistor and diodes, installation of galvanic
anodes for auxiliary drainage of current, adjustment/relocation (if possible) of
offending interference source, provision of electric shield etc., depending on the type
of interference.
Bonding with foreign pipeline/structure as a mitigation measure shall be provided
where the owner of the pipeline/structure has no objection, otherwise, alternative
mitigation measure shall be provided. Where bonding is provided for mitigation the
bonding resistor shall be adjusted for optimum value for minimum/no interference.
Galvanic anodes installed as a mitigation measure shall be sized for the life specified
for permanent CP.
12.0 SYSTEM MONITORING
The temporary CP system provided shall be monitored at all the test stations once in a
month for healthiness/adequacy of protection till commissioning of permanent CP or
for design life of temporary CP specified, whichever is less. During this period if any
deficiency/interference in protection system is noticed the same shall be
rectified/augmented by additional anodes as required. The monitoring report shall be
submitted regularly to owner for his review/information.
13.0 DRAWINGS AND DOCUMENTS
13.1 General
13.1.1 Within three weeks from the date of issue of PURCHASE ORDER, CONTRACTOR shall
submit four copies of the list of all drawings/ data/ manuals/ procedures for approval,
identifying each by a number and descriptive title and giving the schedule date. This
list shall be revised and extended, as necessary, during the progress of work
13.1.2 All drawings and documents shall be in English and shall follow metric system. Number
of copies of each submission shall be as follows unless otherwise specified.
Submission No. of Copies
a. For review/approval 6
b. Drawings issued for execution
construction 6
c. Final / As built drawings
execution/construction 6
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