| 摘要 |
A carriage is designed for transport into and out of a pipe, carrying appropriate lighting and a television camera with a lens cover movable from a remote location between covering and uncovering positions. A movable portion carrying two sets of three nozzles, one of each set being equipped to emit a spray of water, liquid penetrant and air, is mounted on the carriage. After an initial visual inspection on a remote TV monitor to verify location and check for the presence of relatively large cracks or flaws, the lens is covered, the inside pipe surface is sprayed first with water for cleaning, then with penetrant which enters any cracks which may be present, and again with water to wash away any penetrant other than that which has entered cracks in the area being inspected. The surface is then dried by the air nozzle, the lens cover removed and a "black light" source turned on, thus rendering visible on the TV monitor any liquid penetrant which is entrapped in small cracks or faults in the pipe. A radioactive substance may also be carried on the device and used for supplementary inspection by wrapping a photographic film on the exterior of the pipe. |
