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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 ...
A tugboat is typically rated by its engine's power output and its overall bollard pull. The largest commercial harbour tugboats in the 2000s–2010s, used for towing container ships or similar, had around 60 to 65 short tons-force (530–580 kN) of bollard pull, which is described as 15 short tons-force (130 kN) above "normal" tugboats. [5] [6]
The Arktika class is a Russian (formerly Soviet) class of nuclear-powered icebreakers.Also known by their Russian designations Project 10520 (first two ships) and Project 10521 (from third ship onwards), they were the world's largest and most powerful icebreakers until the 2016 launch of the first Project 22220 icebreaker, also named Arktika.
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 ...
Their kort-nozzle allows for a greater bollard pull however it loses its pull at anything over 10 knots (19 km/h; 12 mph) and loses speed in turns. [3] The Ville class are 13.71 m (45 ft 0 in) long with a beam of 4.72 m (15 ft 6 in) and a draught of 2.74 m (9 ft 0 in).
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 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 IRS class of tugboats are a series of Bollard pull tugboats built by Hindustan Shipyard Limited, Visakhapatnam, for the Indian Navy.. INS Sahas and INS Dhiraj tugs were flagged off by Commander (retd) K.S. Subramanian, the Director (shipbuilding) and INS Himmat was flagged off by Rear Admiral (Retd) N K Mishra, NM Chairman & Managing Director of HSL.