Host: The Japan Society of Mechanical Engineers
Name : [in Japanese]
Date : October 08, 2016 - October 10, 2016
Location and size of wall thinning on the circular pipe inner wall was estimated by direct-current potential difference method which is one of non-destructive testing methods. Using carbon steel pipes for pressure service STPG370 as a test material, wall thinning part was formed on the inner surface of circular pipe by machine processing. Potential difference at around the wall thinning part was measured by applying direct current to the material. As a result, the largest normalized potential difference was observed at the wall thinning part showing gradual reduction as the position got away from the wall thinning part. As a result of estimation of wall thinning part by applying this value to a defect current modification method, estimated dimension was proved to be slightly smaller than the actual size even though the position was correctly estimated.
