| 摘要 |
<p>A mobile carrier assembly 1 includes a magazine 2 having as shown five chambers each adapted to receive a pipeline pig, rotatably mounted on a blind hub 4 attached to a carrying handle or frame 5. In use a ROV engages a lug 6 and carries the assembly to an undersea location where a frame member 8 is received by corresponding guide members 27 on a pig launcher/receiver (PLR) 20. The magazine 2 passes through a large connector 22 which engages the blind hub 4. The ROV then operates a bucket drive 28 on said large connector causing the latter to engage the blind hub in sealing fashion. A hydraulic ram 23 controlled by the ROV expands and contracts indexing the magazine to select a pig to be launched or an empty chamber to receive a pig. Indexing is achieved by a roller (not shown) on the free end of the ram shaft engaging in a cusped track 9 on the outside of the magazine. The pressure connection for launching the pig comes in through the centre of the magazine and passes through the blind and back in behind the pig to be launched. The connection can also be the pressure release when the unit is being used as a receiver.</p> |
