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 3 of 19
3.3 Report
vii. Crossing and parallel running of electrified and non-electrified traction (along
with information regarding operating voltage, type AC/DC etc.) as well as
abandoned tracks near ROW having electrical continuity with the tracks in use.
viii. Crossing and parallel running of any HT/AC/DC overhead line
(existing/proposed) along with details of voltage, type AC/DC etc.
ix. Voltage rating, number of cores and sheathing details of under ground power
cables, along ROW or in its vicinity.
x. Information on existing and proposed DC/AC power sources and system having
earth as return path, in the vicinity of the entire pipeline, route such as HV/DC
sub stations, fabrication yards with electric welding etc.
xi. Any other relevant information that may be needed in designing and
implementing proper protection scheme for the proposed pipeline.
Unless otherwise mentioned, Contractor shall condut necessary potential
gradient survey for any existing anode ground bed that may interfere with the
CP system of the pipeline covered under this project.
xii. Any masonry work for other concrete or non conductive constructions in the
ROW which may block the CP current or cause interference to the pipeline.
xiii. Any underground cable running in parallel or crossing the ROW.
On completion of all field work a report incorporating all the results generated from
surveys and details of additional data collected shall be furnished. The report shall also
contain detailed interpretation of survey results and resistivity data enclosed, probable
interference prone areas etc. to form design basis for the scheme of cathodic
protection. This report shall be plotted on semi-log graph sheets.
4.0 CATHODIC PROTECTION DESIGN PARAMETERS
Unless otherwise specified in the project specifications, following parameters shall be
used for design of temporary cathodic protection system.
Those parts of sacrificial anode cathdic protection system which will be integrated with
permanent CP system shall be designed based on permanent CP parameters.
D:\old data\FATEH\MP Region\Kailaras\Tender RFQ\TCP&PCP\Temporary Cathodic Protection - 016A-R1.doc