Design of impressed current cathodic protection of offshore platform in East Borneo Sea

Cathodic protection is one of the corrosion prevention methods commonly used to protect submerged steel structures in the marine environment. This method is done by connecting the steel structure to be protected with other metals that have lower electronegativity or by flowing electric current through an external anode. Generally cathodic protection designs in modern times are based on recommended practices or international standards, empirical approaches, and guidance from previous practical experience. The objective of this study is to design impressed current cathodic protection ICCP system for offshore platforms. The study begins by gathering information or parameters that will be used as input variables in calculations, such as environmental data, structure and anode dimensions, cable resistance, electrical equipment data, and others. In this study, offshore platform in East Kalimantan was used as an object of the research. Structural design of the "V" offshore platform at PT. XYZ is use as research object. The results of this research include DC current requirements, the number of anodes, DC voltages & currents, and power capacity of transformers / rectifiers. It was found that at the service life of 20 years, 4 anodes were needed, while from attenuation it was found that the number of anodes was sufficient to cover all parts of the structure.