| 摘要 |
<P>PROBLEM TO BE SOLVED: To provide a washing method for a pipe inside, which easily recovers a member for cleaning when an abnormality is generated in the member for cleaning in washing. <P>SOLUTION: A ball 22 for cleaning, to which a string 39 for emergency recovering is connected, is inserted from a start-side branch pipe 41 into a main pipe 1 and water W is made to flow into the main pipe 1, so that while the ball 22 for cleaning is sent and also the string 39 for emergency recovering is sent from outside into the start-side branch pipe 41, the inside of the main pipe 1 is cleaned with the ball 22 for cleaning. When the abnormality is generated in the ball 22 for cleaning before the ball 22 for cleaning reaches a reach-side branch pipe in the main pipe 1, the string 39 for emergency recovering is returned outside from the inside of the start-side branch pipe 41, so that the ball 22 for cleaning is returned from the inside of the main pipe 1 into the start-side branch pipe 41 to be recovered. <P>COPYRIGHT: (C)2012,JPO&INPIT |
