| 摘要 |
There is disclosed a variety of arrangements for laying of rigid pipe from reeled storage and/or on-board welding fabrication. Thirteen independent aspects of the invention are identified. In one particular arrangement (FIGS. 3 a- 3 b), a tilting lay tower ( 106 ) having two travelling clamps ( 210, 220 ) is provided centrally on a pipelay vessel with a radius control arch ( 140 ) pivotable to receive rigid pipe from either port or starboard lay paths. A vertical axis reel or carousel ( 104 ) is provided, within an arrangement of curved take-off arms ( 130, 134 ) and a large radius curved wall ( 128 ). By these means, pipe can be loaded onto the carousel either clockwise or anti-clockwise, and can be supplied to the lay tower via the port or starboard lay path. Continuous rigid product fabricated by a selection of welding lines ( 112, 114, 116 ) at the port side can be guided around the large radius wall either for reeling onto the carousel or for direct feeding to the lay tower. A stinger 110 at the starboard side can be used for on-loading of prefabricated pipe. A pipe elevator ( 150 ) can erect larger pipe stalks (double- or quad-joints) from deck level for welding within the tower. Flexible product can be stored within an inner compartment ( 1042 ) of the carousel and laid via the same tower. The vessel may be a reversible conversion of a FPSO.
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