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A model is developed to simulate electrolytic coupling between the carrier and casing pipe in a cased crossing, and to estimate diversion of the cathodic protection current from the rest of the pipeline for a given set of conditions.
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The installation of protective coating systems must be accomplished in a manner that will avoid adverse electrolytic coupling between dissimilar metals in water tanks, process equipment, and even some atmospheric applications where condensing humidity and rainwater provide the aqueous medium for electrolytes. This paper discusses several examples of premature coating and structural failures resulting from the mixing of dissimilar metal types in systems where the anode and cathode areas are not optimized by design or engineering controls.