ANSI/NACE TM0102-2002

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Standard Test Method - Measurement of Protective Coating Electrical Conductance on Underground PipelinesNational Association of Corrosion Engineers / 01-Oct-2002 / 16 pages

This standard test method presents guidelines and procedures for use primarily by corrosioncontrol personnel in the pipeline industry to determine the general condition of a pipeline coating.These techniques are used to measure the coating conductance (inverse of coating resistance) onsections of underground pipelines. This test method applies only to pipe coated with dielectriccoatings.When surveying a coated pipeline system, it may be necessary to determine the conductance ofthe coating. The conductance of a coating can vary considerably along the pipeline. Variationsmay be caused by changes in average soil resistivity, terrain, and quality of construction. To obtaindata for coating conductance calculations, interrupted pipe-to-soil potentials and line currentreadings are taken at pre-selected intervals. It should be noted that the average soil resistivity hasa direct effect on the coating conductance measurement. Because soil resistivity can affect thecoating conductance, it must be known when evaluating a section of a pipeline coating.




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