Generally additional cathodic protection (CP) systems based on sacrificial anodes (and in some naval vessels Impressed Cathodic Protection Systems (ICCP)) are installed in ballast tanks to provide protection to the areas that may become unprotected by degraded coatings. Because of the complex geometry of the tanks and the presence of pipework, equipment and in some cases ladders and walkways the correct placement of both sacrificial & ICCP anodes is essential to get a good potential distribution that ensures no areas are either under or over protected.

Computer modeling has become widely used in the maritime corrosion industry to predict the performance of CP designs and to ensure adequate protection is provided to the structure over its life. In this paper a case study is presented where computer modeling is used to verify and optimize the design of the corrosion control system of a ballast tank and to predict how it will perform over the service life of the tank. Case studies will be presented for both a sacrificial CP system and ICCP design.

Key words: Galvanic corrosion, Cathodic Protection, Ballast tanks, ICCP

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