Impressed current cathodic protection systems and monitoring

摘要

An impressed current cathodic protection arrangement comprising an elongate metallic structure 2 to be protected and cathodic protection apparatus 3, which comprises a DC power supply 31 and an anode 32. One terminal of the power supply 31 is connected to the structure at a connection point 33 and another terminal of the power supply 31 is connected to the anode. The arrangement includes monitoring apparatus 4 for monitoring the effectiveness of cathodic protection provided by the cathodic protection apparatus 3 by determining the electrical potential of the structure relative to surroundings at least one location, which is spaced from the connection point 33. The arrangement may be used to protect pipeline systems and well installations in the oil and gas industry.