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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 ...
This image is a derivative work of the following images: Bollard pull idealized.jpg licensed with PD-self . 2007-12-10T14:20:47Z Himbeerkuchen 568x323 (53873 Bytes) {{Information |Description=illustration of a bollard pull trial under idealized conditions |Source=own work |Date=10 December 2007 |Author=[[user:Himbeerkuchen]] |Permission=Public Domain |other_versions=Bollard_pull_real.jpb
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]
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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 ...
This image is a derivative work of the following images: File:Bollard_pull_real.jpg licensed with PD-self 2007-12-10T14:32:16Z Himbeerkuchen 568x323 ...
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]