Cathodic protection monitoring and survey requirements for offshore platforms and pipelines: Part 2

Equipment for and typical results from fixed cathodic protection monitoring systems. The earliest ‘fixed’ offshore cathodic protection monitoring systems were probably those which formed an integral part of automatically controlled impressed current systems for ships. Early fixed monitoring systems for offshore platforms were developments from these ship systems using either fixed silver/silver chloride [Ag/AgCl] electrodes or fixed zinc [Zn] electrodes in some form of permanent housing that could be attached to the structure. They were exclusively hard wired from their locations to some form of topside display which had either no recording or the most rudimentary event counters.