BLASTING METHOD FOR INSIDE SURFACE OF PIPING AND ALMOST BLOCKING PIECE USED IN BLASTING OPERATION

摘要

PROBLEM TO BE SOLVED: To provide a blasting method by which a collision force of cleaning abrasives against foreign matters is increased, thereby efficiently removing the foreign matters. ;SOLUTION: In the blasting operation, the pressurized air is fed into one end of this piping 1, into which the cleaning abrasives are to be fed, or the cleaning abrasives are made to pass through the piping 1 by sucking the air 2 inside this piping 1 from the remaining other end, and simultaneously, an almost blocking piece 10 is transferred within the piping 1 by being pressed by the air 2 or the cleaning abrasives passed through the piping 1, thereby causing a local pressure fluctuation in the air 2 passing through a gap formed between the inside surface of the piping 1 and the external size of the almost blocking piece 10, whereby the collision force of the cleaning abrasives against the foreign matters is increased by this pressure fluctuation.;COPYRIGHT: (C)2000,JPO