Ships – Mooring device – Boom type
Patent
1996-02-13
1997-10-21
Swinehart, Edwin
Ships
Mooring device
Boom type
114293, B63B 2150
Patent
active
056785038
ABSTRACT:
A method of mooring a storage vessel in the sea is provided. A turret is mounted in a well forward of the vertical center-line of the vessel. A plurality of anchor legs are disposed between the sea bed and the turret. Each anchor leg is fixedly secured to the turret. A mooring buoy is fixedly secured at a submerged position in each anchor leg. The position and buoyancy of the buoy is selected so that normal anchor leg catenary forces which are largely vertical at the connection to a turret have enhanced horizontal components due to the buoyancy of the buoy holding up the anchor leg at a submerged position in the sea. Such enhanced horizontal components enable sufficient torque to be developed between the vessel and the turret so that the vessel may weathervane due to environmental forces such as wind and current. Accordingly, the vessel may be maintained on station and achieve a heading toward environmental forces without the need for auxiliary thrusters or separate turret drives.
REFERENCES:
patent: 2986888 (1961-06-01), Borrmann et al.
patent: 3703151 (1972-11-01), Clement
patent: 4509448 (1985-04-01), Pease et al.
patent: 4892495 (1990-01-01), Svensen
patent: 5044297 (1991-09-01), de Baan et al.
patent: 5159891 (1992-11-01), Lohr et al.
FMC Corporation
Swinehart Edwin
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