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 18 of 24
f) Polarisation Cell
- Location / Identification number
- Rating
- Check for electrolyte
- Check for wiring
- Check standby current drain after CP system energisation. (Current drain with
respect to voltage across the cell shall be recorded).
- Details of grounding provided for the polarisation cell.
g) Spark Gap Arrester
- Location/ identification NO
- Ratings
- Check for healthiness
h) Anode Ground Bed
- Location / Station
- Check for actual layout and compliance with drawings
- Resistance of each individual anode
- Current dissipation by each individual anode with respect to anode voltage
- Total resistance of complete anode bed
- Mutual interference
i) Grounding Cell
- Location
- Type / no. of anodes
- Ratings
11.2 CP Commissioning Procedure
A model commissioning procedure for a 2 station CP system of a pipeline is given
below for general guidance. Contractor shall develop detailed commissioning
procedure as per this guideline and get it approved before commencing CP system
commissioning activities.
i) On completion of installation of anode beds and other systems as envisaged in
this specification, they shall be individually checked, tested and compared
against the agreed specifications and procedure.
ii) The CP commissioning shall be carried out with current interrupter provided in
the output of the CP TR/ ECU Unit to measure CP “ON” & “OFF” potentials.
iii) Current dissipated by each anode shall be corrected through anode lead
junction box.
iv) Electrical continuity of the entire pipeline shall be verified in conformity with
design.
v) Input resistance of the pipeline at all the drainage points shall be checked and
recorded.
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