Ocean going vessels have long employed impressed current cathodic protection systems to minimize corrosion on hulls. In recent years, improvements in offshore oil and gas recovery have led to the development of Floating Production & Offloading vessels and Floating Storage and Offloading vessels (FPSO’s and FSO’s). This new class of vessel is moored in a stationary condition over the production field. The difference in operating conditions between FPSO’s /FSO’s and regular transport ships has initiated a debate over cathodic protection requirements for the hulls of this new class of vessel. A review of offshore vessel and structure CP design is presented, contrasting the effectiveness of impressed current (IC) and galvanic anode designs for the hull. The ability to satisfy industry design codes and recommended practices is presented. Results from design calculations, as well as boundary element modeling (BEM) indicate that galvanic anode design is the optimal method.

Subject
Galvanic anodes, Anode potential, Impressed current cathodic protection, Cathodic protection, Cathodic current, Installation, Negative potentials, Hull, Anodic current, Marine vessels, Floating production storage and offloading units, Galvanic current, Anodes
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2004
Association for Materials Protection and Performance (AMPP)
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