PIPELINE AC CORROSION RISK MEASUREMENT AND EVALUATION METHOD AND MEASUREMENT AND EVALUATION DEVICE

摘要

To provide a measuring and assessing method which can be used jointly across regions wherein different commercial frequencies are employed. The measuring and assessing method for the AC corrosion risk of a pipeline wherein the coupon is connected to a metallic pipeline buried in the earth and the AC corrosion risk of the pipeline is assessed on the basis of coupon DC current density and coupon AC current density that are acquired from a measured value of a coupon current, wherein the measuring and assessing method comprises: a step of specifying frequency to specify a source of AC corrosion from a waveform of the measured value of the coupon current; and a step of calculating a coupon current density whereby a pair of coupon DC current density and coupon AC current density is acquired from the measured value of the coupon current in one time unit by defining one cycle of a specified frequency as one time unit.