Hydraulic and earth engineering – Subterranean or submarine pipe or cable laying – retrieving,... – Submerging – raising – or manipulating line of pipe or cable...
Patent
1992-01-16
1994-01-04
Taylor, Dennis L.
Hydraulic and earth engineering
Subterranean or submarine pipe or cable laying, retrieving,...
Submerging, raising, or manipulating line of pipe or cable...
4051681, 405205, 405210, F16L 112
Patent
active
052755100
ABSTRACT:
The present invention relates to an improved flexible loading system which provides fluid communication between a subsea pipeline and a surface vessel including a hose extending from the subsea pipeline to a first buoyancy tank, a second hose extending from the first buoyancy tank to a central buoyancy tank, a second buoyancy tank, means connecting said second buoyancy tank to the sea floor and to the central buoyancy tank whereby the forces exerted on said central buoyant tank by said second hose and said connecting means are balanced to cause said central buoyancy tank to maintain a preselected position, a riser section extending upwardly from said central buoyancy tank and means on the upper termination for engagement by a vessel on the surface to raise said upper termination onto the vessel to complete the communication for moving fluids between the subsea pipeline and the vessel. In one form the means for connecting between the sea floor to the second buoyancy tank includes an anchor on the sea floor and lines extending from the anchor to the second buoyancy tank and from the second buoyancy tank to the central buoyancy tank. In another form of the invention the means for connecting is a third hose extending from a second subsea pipeline to the second buoyancy tank and a fourth hose extending from the second buoyancy tank to the central buoyancy tank. The central buoyancy tank is preferred to be maintained at a level below the water surface which allows full movement of the vessel while connected to the riser section. A swivel may be positioned in the riser section and a pressure relief system may be included in the loading system to protect it from sudden excess pressures.
REFERENCES:
patent: 3668878 (1972-06-01), Jones et al.
patent: 4498812 (1985-02-01), Lanfranconi et al.
patent: 4563108 (1986-01-01), Ayers
patent: 4687378 (1987-08-01), Jegousse et al.
patent: 4810133 (1989-03-01), Kopp et al.
patent: 4909670 (1990-03-01), Harrison
"Statfjord A Offshore Loading System (UKOLS)", paper presented at OTC in Houston, Tex., May 2-5, 1988 by K. Mork, Ugland Engineering A/S.
de Baan Jacob
van Heijst Willem J.
McBee J. Russell
Taylor Dennis L.
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