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 14 of 24
7.10 Cables
After preparation of the under surface, spray painting with two coats of final paint
shall be done. The finished panels shall be dried in ovens in dust free atmosphere.
Panel finish shall be free from imperfections like pinholes, orange peels, runoff paint
etc. Bidder shall furnish detailed painting procedure alongwith bids.
All unpainted steel parts shall be cadmium plated to prevent rust formation.
i) Cables shall be annealed high conductivity tinned stranded copper conductor,
XLPE insulated, PVC sheathed, 650/1100 V grade, armoured for
Cathode/Anode / measurement cable. Unless otherwise specified in project
specifications, the size of the copper conductor shall be minimum 35 sq. mm.
for anode and cathode cables, 6 sq. mm. for potential measurement and
reference cells, 10 sq. mm. for current measurement, 25 sq. mm. for bonding/
grounding and 10 sq. mm. for anode tail cables. The anode tail cables shall be
XLPE insulated & PVC sheathed and not be armoured and length shall be
sufficient for termination on anode lead junction box without any joint. PE
sleeves shall be provided for unarmoured cables.
ii) The T/R unit incomer cable shall be minimum 10 sq. mm. aluminium, 650/1100
V PVC insulated, armoured, PVC sheathed.
7.11 Panel Cabling and cable glands
Adequate space shall be provided inside the panel for termination of cables.
Termination shall be performed using crimped lugs. Tags with cable numbers
engraved on it shall be attached to each cable at both ends. Cable glands shall be
double compression type of Nickel/ Chromium plated brass. The lugs shall be of tinned
copper. Phases of AC power cables shall be identified with red, yellow, blue PVC
adhesive material.
The armour of the cables from pipeline to CP station (potential measurement,
reference cell & drainage cables etc.), CP station to ground bed (anode cable) and test
station to pipeline shall be earthed only at one end of the cable to avoid armour
carrying CP current.
8.0 INSTALLATION
8.1 Cable Laying
j) Cables shall be laid in accordance with approved layout drawings to be
prepared by the contractor. No straight through joint shall be permitted in a
single run of cable. Cable route shall be carefully measured and cables cut to
required length. Enough slackness in cable shall be provided near anodes to
account for any settling of anode.
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