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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 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.
The Glen-class tugs which the NLTs are replacing have a bollard pull of 18 metric tons (18 long tons; 20 short tons) and 850 horsepower (630 kW) on each side. The NLTs have much increased power at 60 metric tons (59 long tons; 66 short tons) of bollard pull and Azimuth stern drive propulsion with 4,988 horsepower (3,720 kW) per side. [ 1 ]
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 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 ...
One of the missions of a fleet tug was to tow damaged warships back to port. She is equipped with a SMATCO 66 DTS-200 towing winch for service as a towboat. [2] The towing system can accommodate either wire rope or synthetic-fiber hawsers and produce as much as 90 short tons of bollard pull.
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).
MG Winfield Scott (LT-805) at Boston in 2010. The United States Army tugboat MG Winfield Scott (LT-805) was built by Moss Point Marine, Escatawpa, Mississippi and delivered to the U.S. Army on 29 October 1993.
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