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This Association for Materials Protection and Performance (AMPP) standard test method presents guidelines and procedures for use primarily by corrosion control 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) on sections of underground pipelines. This test method applies only to pipe coated with dielectric coatings.
When surveying a coated pipeline system, it may be necessary to determine the conductance of the coating. The conductance of a coating can vary considerably along the pipeline. Variations may be caused by changes in average soil resistivity, terrain, and quality of construction. To obtain data for coating conductance calculations, interrupted structure-to-electrolyte potentials and line current readings are taken at pre-selected intervals. It should be noted that the average soil resistivity has a direct effect on the coating conductance measurement. Because soil resistivity can affect the coating conductance, it must be known when evaluating a section of a pipeline coating.
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Keywords: electrical conductance, dielectric coatings, pipeline coating, soil resistivity , pipeline polarization, coating conductance, pipeline coating inspection
HISTORICAL DOCUMENT. Standard for achieving effective control of external corrosion on buried or submerged metallic piping systems or other buried metallic structures. System design. Coatings. Cathodic protection criteria & installation. Control of interference currents.
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Requirements to ensure adequate isolation of cathodically protected pipelines, especially those with high-quality dielectric coatings.
Application of CP to control external corrosion of carbon steel on-grade storage tank bottoms that are in contact with an electrolyte. Both galvanic anode CP systems and impressed current CP systems.