Ships – Mooring device – Boom type
Patent
1982-06-22
1984-03-13
Marcus, Stephen
Ships
Mooring device
Boom type
141382, 166355, E21B 4301
Patent
active
044360487
ABSTRACT:
A rotary transfer subsystem is described for transferring production fluids, electrical power, hydraulic power, and control signals across a rotating interface between an offshore process vessel and a flowline bundle of service hoses and high-pressure hoses which are connected to a deepwater production riser system. Tensioning devices are also described for maintaining a selected tension on terminal hoses between the interface and the vessel while the vessel weathervanes during maintenance of position in a watch circle above the riser system. The subsystem and the tensioning devices are mounted on the vessel which is equipped with a powered turret within a circular moonpool and is capable of performing most subsea service functions on the riser system without major equipment support. The subsystem and the tensioning devices, in combination, comprise a column assembly which is attached to the turret and supports horizontal loops of terminal hoses; a multi-passage swivel for accommodating a portion of the terminal hoses not containing gas; a tower for selectively tensioning these hoses and for connecting them to production piping; a traveling sheave and drive mechanism which supports horizontal loops of the remaining hoses while maintaining tension on them and adjusting their lengths, between connections to storage facilities in the vessel and to the column assembly, while the column assembly remains rotatably stationary with respect to the flowline bundle during weathervaning of the vessel through at least 270.degree.; and hose support trays for supporting horizontal spans of all hoses between the tower and the column and between the column and the traveling sheave.
REFERENCES:
patent: 3602302 (1971-08-01), Kluth
patent: 3742536 (1973-07-01), Sada et al.
patent: 4052090 (1977-10-01), Stafford
patent: 4388022 (1983-06-01), Gentry et al.
Gentry Larry L.
Moss Herbert H.
Panicker Narayana N.
Wada William T.
Gilman M. G.
Hager, Jr. G. W.
Marcus Stephen
McKillop A. J.
Mobil Oil Corporation
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