| 摘要 |
PROBLEM TO BE SOLVED: To inspect piping and recover a piping inspection device even for piping incapable of forming insertion part only on one side of inspection objective part. SOLUTION: A pig 23 loading a non-destructive inspection apparatus 21 is inserted in piping 22 and wind pressure or fluid pressure generated in the front and the back of the pig are received with a pressure receiver 24 placed on the back and front of the pig, and the pig is propelled by the pressure difference received by the pressure receiver 24. At this moment, a plurality of pressure receiver plate 26, 27 and 28 with different area fixed to each of step end surfaces 25a, 25b and 25c of a step shaft 25 of which tip end projecting to both ends of the pig 23 shrinks is used as the pressure receiver 24, and wind pressure or fluid pressure is dispersed to receive on each of receiver plates 26, 27 and 28.
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