OS0307 Development of on-site type guided wave testing system

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  • OS0307 オンサイト型ガイドウェーブ探傷システムの開発(OS3-2 超音波,OS-3 非破壊評価と構造モニタリング1)

Abstract

In the operation of electric power plant, it is necessary to understand the condition of the pipe quantitatively. The purpose is to prevent the accident caused of the wall thinning portion clue to erosion or corrosion. The thickness of the pipe is partially measured with the ultrasonic thickness gage now. However, it is difficult to investigate the wall thinning portion in the pipe quantitatively without confirming it beforehand. In this study, to identify the location of thinning for the purpose, the ultrasonic testing system using the guided wave was developed, that was able to investigate partially the wall thinning portion of all aspects of pipe to be inspected at a time. The Ultrasonic system that developed was applied to the actual pipe of the power plant. Sensitivity has been improved from the result of the field test. In addition, the propagation control of the guided wave was enabled. As a Result, the range of detection is expanded more than traditional system and the detection accuracy of thinning has been improved. An efficient pipe investigation becomes possible because it widely understand the condition of the pipe by using this system. The reliability improvement of facilities and the reduction of maintenance and repairs are expected to be attempted.

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