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Bollard pull is a conventional measure of the pulling (or towing) power of a watercraft.It is defined as the force (usually in tonnes-force or kilonewtons (kN)) exerted by a vessel under full power, on a shore-mounted bollard through a tow-line, commonly measured in a practical test (but sometimes simulated) under test conditions that include calm water, no tide, level trim, and sufficient ...
Aiviq is the only such vessel to meet these previously specified criteria. [58] The Coast Guard was appropriated $125 million in fiscal year 2024 to purchase Aiviq. The vessel will be homeported in Juneau, Alaska and is expected to reach initial operational capability in 2026. [4]
The bollard pull of the vessel is 158 tonnes. [6] The hull of Kronprins Haakon is strengthened according to International Association of Classification Societies (IACS) Unified Requirements for Polar Class Ships for operations in winter ice with pressure ridges, multi-year ice, and glacial ice inclusions. [7]
However, for short-term operation the icebreaker can use its maximum shaft output of 9,100 kilowatts (12,200 hp) to generate a bollard pull of 1,400 kilonewtons (140 tf). [ 6 ] [ 8 ] The vessel has a service speed of 16.5 knots (30.6 km/h; 19.0 mph) in open water [ 5 ] and maintain a continuous speed of 2 knots (3.7 km/h; 2.3 mph) when breaking ...
The reference load used in the design and testing of the towing winch is twice the static bollard pull. Even if AHTS-vessels are customized for anchor-handling and towing, they can also undertake, for example, ROV (remotely operated underwater vehicle) services, safety/rescue services, and supply duties between mainland and offshore installations.
The vessel's twin shaft lines with controllable pitch propellers can be driven with a maximum power of 18,800 kW (25,200 hp) and, when used in boost mode together with the 1,200 kW (1,600 hp) drop-down azimuthing bow thruster, generate a bollard pull of 307 tonnes (338 short tons). [7]
Bollard pull: 110 tons NoCGV Barentshav is a large offshore patrol vessel of the Norwegian Coast Guard , and is their first liquefied natural gas -powered vessel. The contract was signed 21 October 2005, and NoCGV Barentshav was delivered in August 2009.
The bollard pull and propulsion power would have to be sufficient to allow continuous operation in level ice with a thickness of 1.5 metres (5 ft) and 10–20-centimetre (4–8 in) snow cover as well as make the vessel capable of opening a 25-metre (82 ft) channel through uniform 1.2 metres (4 ft) ice field at a speed of 6 knots (11 km/h; 6.9 ...
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