B204 光ファイバ振動センサを用いた電磁超音波共振法による配管減肉測定システム(検査・モニタリング-1,OS6 保全・設備診断技術)

概要

論文の詳細を見る
Pipes in power plants tends to be damaged at the pipe elbows and lower reach of orifices by FAC (Flow accelerated corrosion) and erosion. Therefore, JSME (Japan Society of Mechanical Engineering) has provided a guideline which describes where and how to detect and measure the pipe damages, based on statistical data on pipe damage and actual performance of inspection methods. As one of the conventional techniques, an ultrasonic thickness meter is generally used to measure the main pipe thickness and detect the corrosion wastage in power generation plants. However, this requires plant outage time and cost to dismantle and reassemble the heat-insulating coat of the pipes. To solve these problems, we developed a new method of measurement by combining Electromagnetic Acoustic Transducer (EMAT) and Fiber-Optic sensors. The pipe thickness is measured by analyzing the resonance phenomenon of ultrasonic wave multi-reflected from both inner and outer surface of the pipe. Since it can be put between the pipe and the heat insulator, this sensor enables us to measure and monitor the thickness of the pipe online.
一般社団法人日本機械学会の論文
2009-06-28