Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...
Patent
1978-03-13
1979-03-27
Larson, Lowell A.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Submerging, raising, or manipulating line of pipe or cable...
72369, 405171, B21D 700
Patent
active
041459091
ABSTRACT:
A method for the controlled bending of a submerged pipeline is disclosed. The section of the pipeline which is to be bent is slightly elevated off the sea floor, preferably by buoys attached to the pipeline along its length. The end of the elevated section of pipeline is pulled in to the desired point of termination while a drag force is simultaneously applied to the elevated portion of the pipeline. The applied drag force should be sufficient to create a bending moment which causes the pipeline to bend along a well defined arc. Preferably, dragging means such as chains, cables, or clump weights extending from the pipeline to the sea floor are used to impose the necessary drag force on the pipeline and to control elevation of the pipeline above the sea floor.
REFERENCES:
patent: 3431739 (1969-03-01), Richardson et al.
patent: 3466882 (1969-09-01), Broussard
patent: 3524325 (1970-08-01), Brown
patent: 3650114 (1972-03-01), Neal
patent: 3765185 (1973-10-01), Peck et al.
patent: 3955599 (1976-05-01), Walker
patent: 4063430 (1977-12-01), Lamy
Rigid Flowline Connection, Ocean Industry, vol. 12, No. 8, p. 45, Aug. 1977.
Casamassima S. J.
Exxon Production Research Company
Larson Lowell A.
Lawson G. D.
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