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The American Bureau of Shipping has a system of ice classes which includes classes A5 through A0; B0, C0, and D0. A5 class is the strongest built of the classes, with D0 being the weakest. All other major classification societies have a similar system of ice classes, and converting between ice classes is relatively easy. In most cases only the ...
Polar-class icebreakers USCGC Polar Star (WAGB-10), USCGC Polar Sea (WAGB-11) are heavy icebreakers operated by the United States Coast Guard (USCG). These cutters, specifically designed for icebreaking, have reinforced hulls, special icebreaking bows, and a system that allows rapid shifting of ballast to increase the effectiveness of their icebreaking.
The 2012-built South African polar research vessel S. A. Agulhas II is one of the few vessels rated PC 5 or higher.. Polar Class (PC) refers to the ice class assigned to a ship by a classification society based on the Unified Requirements for Polar Class Ships developed by the International Association of Classification Societies (IACS).
The ice must be cut through, broken up, or melted. Tools can be directly pushed into snow and firn (snow that is compressed, but not yet turned to ice, which typically happens at a depth of 60 metres (200 ft) to 120 metres (390 ft)); [22] this method is not effective in ice, but it is perfectly adequate for obtaining samples from the uppermost layers. [23]
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Arpatuuq is designed to break level ice with a thickness of 2.5 metres (8.2 ft) and with a 30-centimetre (12 in) snow cover at over 3 knots. In terms of icebreaking capability, this ranks her just below the largest Russian nuclear-powered icebreakers.
Think tank Global Security pointed out several similarities between the Project 23550 design and NoCGV Svalbard, and Canada's Harry DeWolf class. [10] All three class are of approximately the same displacement, capable of transitting similar thickness of ice and have similar size crews, with room for mission specialist.
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