Abstract
A theoretical evaluation has been made of the effect of a partial coating of a steel surface (with an organic paint system) on the internal distribution of hydrogen atoms generated by cathodic protection. Calculations were performed for large diameter tubing as used in offshore construction and the effect on hydrogen atom concentration of varying the area of the exposed metal and the thickness of the steel section was assessed. It is recommended that when a partial coating is applied to pipes the minimum width of the exposed region should be of the order of the pipe wall thickness and preferably twice that value.
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