Mitsubishi Heavy Industries Technical Review
    Vol. 53 No. 4 (2016)   New Products & Technologies
    Technical Papers

    Thickness Measurement Technology using Cable-less Inner UT for Boiler Heat Exchanger Tube

    Mikiyasu Urata,
    Kiyotaka Aoki,
    Naoya Urata,
    Takayuki Wada,
    Senichi Tsubakizaki,
    Shintaro Matsumoto

    Heat exchanger tubes in the main equipment of thermal power plant boilers, such as economizers and reheaters, have concerns about the occurrence of local thinning caused by wear of the external surface and widespread corrosion thinning. As a technology for the accurate detection of such damage, Mitsubishi Heavy Industries, Ltd. (MHI) and Mitsubishi Hitachi Power Systems, Ltd. developed the cable-less inner UT system, which is an ultrasonic water immersion method that can measure tube thickness from inside the tube. This paper describes a summary of the cable-less inner UT system and an example case of heat exchanger tube thickness measurement performed on an actual boiler.