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AssigneeAllseas Group S.A.
InventorsJohannes John Cornelis Isbister Drost, Albert Ploeg, Erik Jan Rooduijn
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The invention provides a method for laying a pipeline on a floor located under water, wherein a pipe string is lowered from the pipe-bedding installation to the floor, characterized in that the part of the pipe string situated between the water surface and the floor is at least partially supported by bearing mechanism which engage on the pipe string, wherein an axial displacement is realized between the bearing mechanism on the one hand and the pipe string on the other. A heavy pipeline can hereby be laid on a deep seabed, for instance at a depth in the order of magnitude of 1-3 km, and/or the capacity of the draw benches on board the pipe-bedding installation can be reduced.
Apparatus for laying a pipeline on a floor located under water comprising a pipe bedding installation with securing means for supporting a pipe string extending between the pipe bedding installation and the floor while said pipe string is lowered into the water, characterized by bearing means which at least partially supports the part of said pipe string situated between the water surface and the floor, said bearing means comprising a plurality of trunk elements which are movable between an engaging condition in which said trunk elements engage on said pipe string and a release position in which said trunk elements are upwardly displaceable relative to said pipe string while in sliding engagement with other trunk elements on the pipe string.
Dependencies are inferred from the claim text.