| 摘要 |
Apparatus for cutting through a pipe wall under water, as in decommissioning an offshore structure, has a body (16) which can be lowered down the pipe (10) and then locked in position, and a cutting head (20) at the bottom of the body with a toothed disc-like blade (52) which can be advanced radially into contact with the pipe wall and rotated about its own axis to cut through the pipe wall. The cutting head is then rotated and makes one revolution to cut right through the pipe wall to separate an upper pipe section from a lower pipe section. To keep the cut open as cutting proceeds, wedges (62) are fired into the cut around the pipe as the cutting head rotates and leaves an open cut behind it. |
