| 摘要 |
PROBLEM TO BE SOLVED: To specify a thickness-reduced section of a pipe due to liquid drop collision erosion, produced at a curved part of a pipe through which steam flows. SOLUTION: A method for inspecting reduction in the thickness of a pipe A due to liquid drop collision erosion 11 produced at a curved part 2 of the pipe 1, through which steam flows by collision of liquid drops in the steam to the inner surface of the pipe includes measuring of pressure fluctuation, based on propagation of sound waves generated by the liquid drop collision erosion 11 in the steam, by using sensors 3, 4, 5, 6 provided at positions upstream and downstream of the curving part 2 of the pipe 1 with intervals; determining the propagation rates of the sound waves propagating in the steam upstream and downstream separately by using the measured results of these; and specifying the production location of the liquid drop collision erosion 11 by the sonar principle, by using the determined propagation rates of the sound wave upstream and downstream and the time difference between the time of the sound waves that has reached the sensor upstream of the curved part 2 and the time of the sound waves that has reached the sensor downstream. COPYRIGHT: (C)2011,JPO&INPIT
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