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This paper discusses the design process and challenges in choosing what was at the time, the largest ever cathodic protection retrofit in terms of delivered current capacity offshore, and the actual current the structure required to maintain protection.
An oil drilling and producing jacket was installed in the North Sea in 1980 100 miles off the coast of Scotland in 160 m depth seawater. The jacket has 8 legs and was installed with traditional standoff galvanic anodes.Surveys from 2010 to 2013 indicated a reduction in corrosioinprotection from the cathodic protection system and plans were implemented to upgrade the cathodic protection system. In 2015 a remote anode sled impressed current cathodic protection system was installed and commissioned in early 2016.This paper discusses the design process in choosing what is at the time the largest ever cathodic protection retrofit in terms of delivered current capacity offshore and the actual current the structurerequired.
Key words: Cathodic Protection Retrofit, Offshore ICCP, Current Density
In this paper, a new concept named CP by distributed sacrificial anodes (DSA) is presented. The main principle of CP by DSA is to convert cathode area to anode area by distributing anode mass over the surface of the equipment to be protected.
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An experimental setup was designed to investigate the cathodic protection (CP) penetration into coating disbondment. Embedded detection probes underneath the disbondment enabled pH and steel potential measurements without disturbing the environment inside the disbondment.