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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 ...
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 ...
The same type of "weigh bar" can be used to measure horizontal loads and "drawbar pull" of wheeled/tracked or vehicles or "bollard pull" of boats or the "thrust" of jet engines when a proper "test rig" is designed and constructed to provide "frictionless" fore-aft movement of the load relative to the weigh bars.
Bollard pull can increase up to 30% with ducts. With decelerating ducts, the circulation opposite of the Kort nozzle, resulting in a negative thrust of the duct. This type is used for high speed vessels with increased exposure to cavitation and vessels that want to reduce noise levels, such as warships.
The towing system can accommodate either wire rope or synthetic-fiber hawsers and produce as much as 90 short tons of bollard pull. [5] [6] [4] She has a 10-ton capacity crane for moving loads on the aft deck. [3] There were connections to bolt down shipping containers and other equipment. Like all MSC ships, Narragansett was crewed by civilian ...
Aiviq is an American icebreaking anchor handling tug supply vessel (AHTS) built in 2012 to support oil exploration and drilling in the Chukchi Sea off Alaska.The vessel's primary task was towing and laying anchors for drilling rigs, and oil spill response.
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]
The vessels are of the Vik-Sandvik design VS 794 CGV, and were built by Myklebust Verft and operated by Remøy Management on behalf of the Norwegian Coast Guard.. The Coast Guard expects a 90% decrease in NO x fume releases, and a 20% decrease in CO 2 releases compared to a conventionally powered vessel of similar size.
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