| 摘要 |
A device or drift for gauging the inside diameter of pipe comprising an elongated body having a cylindrical outer surface adapted to receive a set of bushings having an outside diameter consistent with the inside diameter of the pipe to be gauged. A plurality of bushing sets are available for use on the body to gauge various weights and sizes of pipe. The body is formed of a hard, heavy material to force the drift through the pipe, while the bushings are formed from a softer material so as to avoid injury to the pipe when the drift passes through it. The bushings are formed with channels and holes axially therethrough to allow the passage of fluid contained in the pipe in order that such fluid will not hinder the movement of the drift. A retriever is also disclosed which may be dropped through the pipe to dislodge a stuck drift. The retriever has a shock transfering end which imparts momentum to the drift in order to free it.
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