| 摘要 |
A method of laying a pipeline ( 6 ) underwater includes the steps of holding an end of a pipeline ( 6 ), providing a pipe section ( 5 ) for extending the pipeline ( 6 ), arranging the pipe section ( 5 ) adjacent to the end of pipeline ( 6 ) thereby defining a circumferential joint ( 7 ) to be welded, and welding the pipes ( 5, 6 ) together. A plurality of welding torches ( 8 ) move along the circumferential joint ( 7 ) and are operated simultaneously to weld the pipes together. The pipes ( 5, 6 ) are made of TMCP-SC steel. After the root weld is laid, a cooling ring ( 1 ) mounted on an internal clamp inside the pipes ( 5, 6 ) sprays cooling liquid, for example a fluid spray of atomised water ( 10 ) and air, from nozzles ( 2 ) onto an interior surface of the pipes ( 5, 6 ) in the region of the circumferential joint ( 7 ), thereby cooling the pipes ( 5, 6 ).
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