| 摘要 |
Inspection apparatus adapted to be propelled through a pipeline. Means are provided to establish a circumferentially directed flux field in wall of pipe, and longitudinally extending flexible fins or flaps of elastomeric material curve outwardly from apparatus to resiliently hold flux leakage detection means against wall of pipe. Means responsive to axial movement of apparatus imparts helical movement of apparatus. Apparatus is readily adapted to inspect pipelines of different sizes.
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