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Encyclopedia of Marine and Energy Technology

Deep pipelaying


Deepwater generally means greater than 500m, whereas very deep water means 1000m or deeper for offshore pipeline installations. In the area of deep pipelaying, the combination of dynamic positioning  and J-lay method is used. In a J-lay method, pipes are laid in a near-vertical position with a specially-designed pipe support tower and a very short stringer. The pipe string is suspended nearly vertical through water depth and bends horizontally in the sagbend strictly adjacent to the seabed. See also Pipelaying methods.