Offshore platform stabilizing strakes

Details Offshore platform stabilizing strakes Offshore platform stabilizing strakes

2005-10-11

2005-10-11

Lagman, Frederick L. (Department: 3673)

Hydraulic and earth engineering

Marine structure or fabrication thereof

Structure protection

C405S195100, C405S223100, C114S264000

Reexamination Certificate

active

06953308

ABSTRACT:
An elongated, annular hull of a floating offshore platform includes one or more segmented, helical strakes disposed on an outer peripheral surface of the hull to reduce vortex-induced vibrations resulting from water currents. The hull may comprise a single annular hull or a plurality of parallel, adjacent hulls. Each strake includes a plurality of generally rectangular segments extending substantially radially outward from the hull. Each of the segments includes a pair of spaced-apart radial stanchions supporting a generally rectangular frame to which a corresponding panel is attached. The panels have a radial width that is about 13 percent of the effective diameter of the hull. The segments are arranged in a spaced-apart, end-to-end relationship that defines a discontinuous, but generally helical band extending around the circumference of the hull from about 35 feet (11.7 m) below the mean water line of the hull to its lowermost end.

REFERENCES:
patent: 6148751 (2000-11-01), Brown et al.
patent: 6244785 (2001-06-01), Richter et al.
patent: 6349664 (2002-02-01), Brown et al.
patent: 6371697 (2002-04-01), Huang et al.
patent: 6575665 (2003-06-01), Richter et al.
patent: 6726407 (2004-04-01), Steinkamp et al.

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