Old cabinets, new CP system

3 September 2003

BAC Corrosion Control has upgraded automatic cathodic protection (CP) control system for the cooling water supply and discharge system at the Torness plant in Scotland.

Torness uses four vertical mixed flow pumps, each rated at 11m3/s and 1490kW, to circulate sea water from the North Sea. The impressed current CP system is controlled from four cabinets, originally installed by BAC Corrosion Control in 1985, when the AGR was built. Since that time control technology has advanced and various factors prompted the station management to replace the old cabinets with more up-to-date equipment.

BAC stripped out all the old control gear from the cabinets, which used grid coil resistors to vary anode current in the CP system, and installed new control modules so that current could be more precisely controlled than before.

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