Numerical analyses and experimental measurements on potential distributions inside a ballast tank were studied. The relationship between the paint conditions and potential distributions was quantitatively examined. The actual potential distribution in a ballast tank were measured. A boundary element method for a cathodic protection system was employed to the numerical analyses. A polarization resistance of a metal was obtained by a laboratory experiment for the numerical analyses. A differential analysis and a differential measurement were proposed. The differential numerical results were compared with the differential experimental results in the ballast tank. It was seen that the differential potential distributions were well modeled in the numerical analyses.

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