Marine pipelaying vessel and method for pipelaying
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United States of America Patent
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Jul 14, 2015
Grant Date -
Nov 13, 2014
app pub date -
Dec 10, 2012
filing date -
Dec 14, 2011
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Abstract
The present invention relates to a marine pipelaying vessel for S-lay pipelaying an offshore pipeline and integrating one or more accessories into the pipeline, and a method for S-lay pipelaying wherein use is made of such a vessel. The vessel according to the invention comprises a hull (1) having a stinger end and a stinger (20) for guiding the launched pipeline in a curved pipeline trajectory, which stinger is pivotably connected to the hull, and an accessory handling J-lay tower (30) at the stinger end of the hull. The J-lay tower allows the pipeline and connected accessory to be laid in J-lay mode while connecting further pipe sections to the pipeline at least until the accessory has been lowered past below the retracted stinger. A stinger support assembly (15) is provided for supporting the stinger in a pipelay position, and for allowing movement of the stinger between the pipelay position and a steep downwardly pivoted retracted position by pivoting the stinger about its stinger pivot axis, wherein the stinger in the retracted position is away from the J-lay firing line.
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