| 摘要 |
An assembly of insert piping for a tuyere pipe of a metal refining furnace comprises a length of pipe flared outwardly at one end to approximately the internal diameter of the tuyere pipe of the furnace, so as to fit snugly therein. The length of pipe is provided at its flared end with means for connection with a pipe puller and has its other end provided with means for temporary connection with a length of injection pipe that is adapted to project several inches into the furnace. The flared end of the flared pipe is preferably a bell-end adapter pipe fitting into which a pipe puller can be screwed, and the opposite end of such flared pipe is preferably connected to the injection pipe by means of a sleeve pipe coupling. The flared length of pipe is preferably of black iron perforated along its length to permit gas circulation therearound.
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