| 摘要 |
A marine pipelay vessel equipped with a pipe laying apparatus comprising a pipe handler for moving the pipe into its raised launching position, a pipe connection station for connecting together pipe ends when in the launching position, a pipe support for maintaining the pipe in a raised position, a static clamp for releasably securing the upper end of a previously launched pipe, a pipe launcher for controllably launching the raised pipe stalk in which the pipe launcher comprises a second mobile clamp adapted to be releasably secured to the pipe such that the second clamp may be raised and lowered controllably over a predetermined stroke distance between the uppermost and the lowermost stroke position relative to the vessel. The pipe may be gripped alternatively by the first clamp and second clamp thus allowing the pipe to be launched from the vessel in a stepwise manner of a repeating cycle in which the first clamp is applied to the pipeline whilst the second clamp is being raised to its uppermost stroke position, then transferring the load of the pipeline from the first clamp to the second clamp, then lowering the second clamp to its lowermost stroke position. |
