Riser keel joint assembly

Details Riser keel joint assembly Riser keel joint assembly

2007-05-15

2007-05-15

Lagman, Frederick L. (Department: 3673)

Hydraulic and earth engineering

Marine structure or fabrication thereof

With anchoring of structure to marine floor

C405S224400

Reexamination Certificate

active

11214086

ABSTRACT:
A riser joint keel assembly. A tapered riser joint is connected to a larger diameter outer sleeve through a connection that allows the tapered section and outer sleeve to function as one unit. In the combined design, the outer sleeve provides the required sliding interface between the riser and the guide at the keel of the hull while also providing some of the bending compliance needed to transition from the riser supported in the hull to the riser unsupported below the hull. The tapered section also provides the remaining bending compliance needed for the transition. The connection between the tapered and sleeve sections is a forged, machined ring plate welded to the bottom end of the sleeve, which provides a base for either bolted or threaded type attachment points for the tapered riser joint below the ring plate and the internal riser joint that continues to the surface.

REFERENCES:
patent: 5683205 (1997-11-01), Halkyard
patent: 5887659 (1999-03-01), Watkins
patent: 6176646 (2001-01-01), Finn et al.
patent: 6422791 (2002-07-01), Pallini et al.
patent: 6746182 (2004-06-01), Munk et al.
patent: 6884003 (2005-04-01), Horton, III
patent: 7013824 (2006-03-01), Otten et al.

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