Large diameter mooring turret with compliant deck and frame

Ships – Mooring device – Having ship-mounted turret

Reexamination Certificate

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Reexamination Certificate

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06990917

ABSTRACT:
A very large diameter turret for mooring a VLCC class FPSO vessel. A large diameter rail and wheel bearing system is disposed between a turret main deck and the hull of the vessel. The turret is designed for a flexibility to allow the turret main deck to conform to the sag or hog of the vessel so that excessive forces on the wheels of the bearing system are avoided. The turret's main deck, in a preferred embodiment, includes a center hub, an outer ring, and spokes between the hub and outer ring. A lower chain deck is preferably connected to the main deck by pillars or columns, or alternatively by riser tubes alone, or other structures that achieve the desired flexibility of the main deck.

REFERENCES:
patent: 5052322 (1991-10-01), Poldervaart et al.
patent: 5359957 (1994-11-01), Askestad
patent: 5515804 (1996-05-01), Pollack
patent: 5517937 (1996-05-01), Lunde
patent: 5746148 (1998-05-01), Delago
patent: 5850800 (1998-12-01), Commandeur
patent: 5860382 (1999-01-01), Hobdy
patent: 6164233 (2000-12-01), Pollack et al.
patent: 6263822 (2001-07-01), Fontenot et al.
patent: 6269762 (2001-08-01), Commandeur
patent: 165285 (1991-01-01), None

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