| 摘要 |
<p>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 downwardly 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.</p> |
