Measurement of Current Density and Coating Resistance

This entering current causes ohmic voltage drops in the soil at holidays in the pipe coating, which are specified as At/, AI/j, Af/j. Af/ from which the average value 

There is a correlation between the average protection current density of the particular measured section 

Since these are usually not known, calculations are not possible, for example, from the lowest protection current density, J, at the protection potential, U. The measurement of protection current requirement is based on the fact that the protection criterion Eq. (2-39) f/ is achieved at every position. In contrast to the coating 

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