Weight type motion compensation system for a riser moored tanker

Details Weight type motion compensation system for a riser moored tanker Weight type motion compensation system for a riser moored tanker

1984-06-12

1986-02-04

Barefoot, Galen L.

Ships

Mooring device

Boom type

441 5, B63B 2100

Patent

active

045678421

ABSTRACT:
A system for mooring a ship-shape floating production system using a riser tensioned by a weight type motion compensation system. The riser is attached to the ship by a rocking beam that has a weight attached at one end of the beam to balance the vertical load component of the riser attached at the other end of the beam. A rocker arrangement is used whereby the beam support point moves to compensate for the inertial forces of the weight caused by the vertical accelerations of the tanker. Thus the high load fluctuations and hence poor riser fatigue life usually associated with weight type motion compensators is minimized. A gear arrangement is used to transmit horizontal loads. The overall arrangement provides a totally self-contained motion compensation and riser handling system that requires minimal ship modifications and is independent of significant self-induced wave loading.

REFERENCES:
patent: 2560463 (1951-07-01), Matson
patent: 3605668 (1971-09-01), Morgan
patent: 3895677 (1975-07-01), Bokenkamp
patent: 3918379 (1975-11-01), McNary et al.
patent: 3919379 (1975-11-01), Graham et al.
patent: 3939991 (1976-02-01), Person
patent: 4128229 (1978-12-01), Elliston
patent: 4176722 (1979-12-01), Wetmore et al.
patent: 4309955 (1982-01-01), Kentosh
"Gravity-Base SALS at Tazerka" from Offshore Europe, Tanker Production Eyed for Deep, Rough Seas in Offshore, Mar. 1983.

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