B - Operations – Transporting – 63 – B
Patent
B - Operations, Transporting
63
B
114/58.2
B63B 35/44 (2006.01) B63B 35/08 (2006.01)
Patent
CA 1103999
ABSTRACT OF THE DISCLOSURE A novel canopy system is provided for deployment around the periphery of a drillship for use in Arctic waters. The canopy system includes: (a) a set of spaced-apart structural frames extending down- wardly from an inboard end to an outboard free end; (b) means for the two-phase releasable securing of the inboard end of the frames to the periphery of the vessel; (c) an outer stressed skin supported by, and tensioned over, the outer surface of the frames; (d) an inner skin supported by the outer stressed skin; (e) a skirt depending downwardly from the outboard free end of the frames; and (f) a plurality of ducts for supplying heated air to the skirt for adfreeze prevention. The releasing means is a two-phase jettisoning system, in which as a first phase the canopy is permitted to tilt onto the water, and, as a second phase is completely jettisoned from the ship. By these means, a canopy is provided which is simple and reliable with contingency features to permit jettison and recovery under emergency conditions.
334743
Bercha Frank G.
Marshall Robert E.
O'rourke J. Cam
Pilkington G. Roger
Dome Petroleum Limited
Wotherspoon S. F. M.
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