OS0407-186 Study on Nondestructive Identification of Location and Thickness of Pipe Wall Thinning by Inverse Analysis of Electromagnetic Field : Verification by Using Grooved Plate Specimen

Abstract

Recently, the decision of the appropriate time to replace the pipe is becoming important because of an accident prevention and a long life of industrial structures etc. Therefore, techniques of identification of location and thickness of pipe wall thinning is necessary. In this study, a new technique of nondestructive identification of location and thickness of pipe wall thinning has been developed by using inverse analysis of electromagnetic field. For the technique, the location and thickness of the thinning are estimated from measured magnetic flux density when an electric current is applied to the surface of pipe. Furthermore, the sensitivity for the magnetic flux density is improved by using high magnetic permeability material. In order to verify the validity of the proposed technique, measurement experiments were performed by using the grooved plate specimens that imitate a thinning part of the pipe.