1975-01-30
1977-04-05
Taylor, Dennis L.
61105, B63B 3504
Patent
active
040154351
ABSTRACT:
A marine pipelaying apparatus for supporting pipeline during undersea pipelaying operations from a vessel floating on the surface of a body of water. The apparatus includes a tapering and longitudinally extending pipeline support member secured at one end to the vessel in a cantilevered manner and extending into the water. The pipeline support member includes a plurality of demountable sections decreasing in diameter and having sufficient buoyancy to float. The support member is designed to bend as it supports the pipeline being laid providing a desired profile without exceeding the elastic limit of the pipe. A hydraulic clamp for releasably clamping the pipeline support member is mounted on the vessel to secure the pipeline support member in a fixed relation to the vessel. A plurality of variable buoyancy floats and roller cradle mechanisms for buoyantly and slidably supporting a section of pipeline are attached above the pipeline support member. The apparatus can impart a stabilizing force to the pipeline and create a uniform stress distribution along the pipeline being laid which is within its elastic limit.
REFERENCES:
patent: 3273346 (1966-09-01), Delaruelle et al.
patent: 3321925 (1967-05-01), Shaw
patent: 3487648 (1970-06-01), Lawrence
patent: 3507126 (1970-04-01), Rochelle et al.
patent: 3566609 (1971-03-01), Smith
patent: 3765185 (1973-10-01), Peck et al.
patent: 3822558 (1974-07-01), Blankenship
J. Ray McDermott & Co. Inc.
Taylor Dennis L.
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