Deepwater designs and manufactures cathodic protection systems for purpose-built and conversion FPSO (Floating Production Storage and Offloading) structures. The nature of FPSOs presents some interesting cathodic protection challenges. Some FPSOs are treated as ships and others as floating production platforms, which requires a cathodic protection designer to shift between design methodologies for different components of the structure. Moorings, hulls, ballast tanks and other parts of the FPSO are all susceptible to different complications, requiring engineers to be versed in the many options available. To design a system that protects the structure as a whole, each part must be addressed separately.