E - Fixed Constructions – 21 – B
Patent
E - Fixed Constructions
21
B
E21B 7/132 (2006.01) B63B 22/02 (2006.01) B63B 35/44 (2006.01) E02B 17/00 (2006.01) E21B 17/01 (2006.01)
Patent
CA 2439788
A compliant stem buoyancy can and guide for a floating offshore structure or vessel. The buoyancy can is supported at the upper stop and the various heave plates by a slip ring that allows axial displacement but constrains any radial motion. The buoyancy can behaves as a complaint beam with a dynamic response like a spring/mass/damper. The stiffness and mass acts to govern the amplitude and frequency of the motion. The water in the well bay reacts to the relative speed of the vessel motion and the buoyancy can. The water thus acts as a damper. The vessel, stem, and buoyancy can are designed so the clearance between the buoyancy can and hull is larger than the maximum amplitude of the oscillation. Therefore, the can will not impact the hull. The kinetic energy is dissipated by the compliant response of the buoyancy can and stem structure. Because the buoyancy can never hits the hull there are no impact loads or fatigue associated with impacts.
Mentor Subsea Technology Services Inc.
Ridout & Maybee Llp
LandOfFree
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