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 15 of 24
ii) All cables inside station / plant area shall be laid at a depth of 0.75 M. Cables
outside station / plant area shall be laid at a depth of 1.5m. Cables shall be laid
in sand under brick cover and back filled with normal soil. Outside station /
plant area, the routes shall be marked with polythylene cable warning mats
placed at a depth of 0.9 mtr. from the finished grade.
iii) In case of above ground cable installations, all un-armoured CP cables shall be
laid in GI conduits of sufficiently large size.
iv) All underground unarmoured cables shall run through PE sleeves. Distant
measurement cables and permanent reference cell cables routed along the
pipeline shall be carried at the top of the carrier pipe by securely strapping it
with adhesive tape or equivalent as required.
v) RCC or GI pipes of proper size shall be provided for all underground cables for
road crossings.
vi) Cables shall be neatly arranged in trenches in such a manner that crisscrossing
is avoided and final take-off to equipment is facilitated.
8.2 Cable to pipe connections
All cable connections to the pipeline including charged foreign pipelines shall be made
by an approved exothermic process. A suitable water proof sealing system of the cable
connections shall be made which will be compatible with parent coating system of the
pipeline after exnothernice process.
For charged pipeline pin-brazing shall be used. Eutectic solder shall not be acceptable
for charged or non-charged pipeline.
8.3 Ground bed fencing
8.4 Civil Works
A chain link fencing shall be provided around each ground bed location as per job
requirements.
All civil works as per enclosed specifications associated with the complete cathodic
protection system are included in scope of contractor. This shall include providing
cable trenches and foundations for all equipment, outdoor T/R units, anode lead
junction boxes, all test stations, polarisation cells, etc.
9.0 SHOP INSPECTION AND TESTING
i) Owner/ Owner’s representative shall visit the works during manufacture of
various equipment to assess the progress of work as well as to ascertain that
only quality raw materials are used. All necessary assistance shall be provided
by contractor and vendors during such inspections.
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