This Standard provides guidelines for the cathodic protection of external surfaces of fixed immersed structures, including offshore platforms, wharves, jetties, pontoons, sewage treatment plants, water treatment plants, lock gates, dam gates, pump station piles in rivers, weirs, mooring buoys, piling, foundations and water inlet/outlet structures.The Standard specifically covers the following subjects which relate to cathodic protection:(a) The design of structures requiring cathodic protection.(b) Coatings for use on immersed metal structures.(c) Criteria for the choice of cathodic protection potential.(d) The design of cathodic protection systems.(e) The installation of cathodic protection systems.(f) The control of interference currents on foreign structures.(g) The cathodic protection of structures subject to stray direct current.(h) The operation and maintenance of cathodic protection systems.NOTES: 1 Guidance on the general use and design of cathodic protection systems and factors affecting the corrosion of immersed metallic structures are given in Appendix A.2 This Standard employs positive current flow, and uses the potential sign conventions specified in AS 1852.