| 摘要 |
The pipe carrying drum (30), mounted with its axis parallel or right-angles to the fore-aft direction of the vessel hull, has a curved launch structure (36) with pipe engaging clamps (46 and 48) engaging the pipe along a curved path, and reciprocally moveable to tension the pipe. The curved path has an angle of curvature which is approximately equal to the residual curvature of the pipe drawn from the drum. The launch angle can also be adjusted by moving the angle or position of the curved path within a plane perpendicular to the drum axis by a telescopically movable launch arm 58 with curved and straight portions (58a,b) or by an angularly movable cantilever arm. An abandonment and recovery system comprising a winch and pulleys is mounted on the launch structure, which is moveable alongside the drum as a level wind, as a carriage 40, portal frame or crane with an arm across the drum.
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