Method of deployment, release and recovery of ocean riser pipes

Details Method of deployment, release and recovery of ocean riser pipes Method of deployment, release and recovery of ocean riser pipes

1980-01-14

1981-10-13

Novosad, Stephen J.

Hydraulic and earth engineering

Marine structure or fabrication thereof

114264, 405 52, 405188, E02D 2100, E02D 2906

Patent

active

042945640

ABSTRACT:
An ocean thermal energy conversion facility includes a long pipe assembly which is supported at its upper end by the hull of the floating facility. Cold water flows to the facility from deep in the ocean. The pipe assembly comprises an elongate pipe construction and a weight connected to the lower end of the construction by a line of selected length. A floatation collar is connected to the construction at its upper end to cause the construction to have positive buoyancy and a center of buoyancy closer to the upper end of the construction than its center of mass. The weight renders the entire pipe assembly negatively buoyant. In the event that support of the pipe assembly should be lost, as by release of the assembly from the facility hull in an emergency, the assembly sinks to the ocean floor where it is moored by the weight. The pipe construction floats submerged above the ocean floor in a substantially vertical attitude which facilitates recovery of the assembly.

REFERENCES:
patent: 1404921 (1922-01-01), Adams
patent: 1643733 (1927-09-01), Wood
patent: 1872212 (1932-08-01), Zahrajian
patent: 2689460 (1954-09-01), Wilson
patent: 2827268 (1958-03-01), Staaf
patent: 3293867 (1966-12-01), Dean
patent: 4027493 (1977-06-01), Guy, Jr.
patent: 4069680 (1978-01-01), Erler
patent: 4127004 (1978-11-01), Vilain

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