| 摘要 |
<p>An apparatus is disclosed for efficiently and positively cleaning a main piping not only totally, but also partially by the reciprocation of a pig. The cleaning apparatus is provided with a launcher (4) for projecting a pig and a catcher (36) for receiving the pig at both ends of a main piping (37). A compressed gas is supplied from a feed nozzle of the launcher thereby to send the pig to the catcher (36). In consequence to the arrival of the pig, the compressed gas is discharged through a discharge nozzle (29) of the catcher (36), when the pressure is decreased and the pig is accordingly stopped. The decrease of the pressure is detected by a pressure sensor (33) of the launcher (4). When the pig arrives at the catcher (36), it is detected by a pressure sensor (33) of the catcher (36). The compressed gas is supplied from a feed nozzle (22) of the catcher (36) based on the detecting signal of the pressure sensor (33) of the launcher (4), thereby to send the pig towards the launcher (4). The reciprocating motion of the pig is executed by opening/closing electromagnetic valves of the launcher (4), catcher (36), main piping (37) and branch pipes (41a, 41b) by means of a controller. <IMAGE></p> |
