Patent ID: 9056658
Filing Date: 2015-06-16
Classification: B63B,B63H

Abstract:
1. An icebreaking vessel for use in proximity to an offshore installation in an area containing drifting ice, said vessel comprising: a hull having at least one hull portion; motive power means for moving the vessel while it is anchored, said motive power means including at least one propeller shaft; said at least one hull portion on said hull having a lower wall being positioned deeper than said at least one propeller shaft, wherein said lower wall of said at least one hull portion defines a flat bottom on said hull; a substantially straight internal passage that extends from an underwater opening defined in the lower wall of the hull, between a mid section of the vessel and one of a bow and a stern of the vessel, to an opening in a top deck of the vessel adjacent to a winch, wherein the bow and stern are configured with an icebreaking portion; and an anchor connected to said vessel via an anchor line, said anchor line extending through said substantially straight internal passage to the winch; wherein said hull is a monohull and said vessel is capable of performing icebreaking tasks while anchored.