Bollard pull is a conventional measure of the pulling (or towing) power of a watercraft.

Nov 24, 2022 · Pulling force or bollard pull value describes the towing ability of a tugboat when its position is stationary, that is, when it is not making way. As the tug makes way, the towing force decreases due to the underwater resistance of the tugboat.We can say that there is an inverse proportion between the speed of the tug and its towing capability.

Aug 5, 2021 · Bollard Pull is a measure of the pulling power of a vessel, comparable to the horsepower rating of conventional vehicle engines. It can be defined as the thrust that is developed by the propulsion systems of any vessel when it …

Bollard Pull is a critical concept in marine engineering, primarily used to measure the pulling or towing capacity of tugboats and other maritime vessels. It is defined as the force exerted by a vessel under full power on a shore bollard through a towline and is usually measured in tonnes.

Feb 4, 2017 · The most certain method to establish a tug’s pulling power is a bollard pull test. While our calculator can help you in knowing how much bollard pull will be required to tug a particular vessel, it won’t help you establish the pulling power of a tug.

Feb 18, 2017 · In the Part I we saw how to calculate the required Bollard Pull to select a tug. At this stage, we have accomplished the following. In this part we will see how we can estimate the maximum safe towing speed for the vessel to ply in a given sea state.

Aug 13, 2022 · The Bollard Pull is essentially a useful metric to tell you how useful a tug can be when towing a stationary ship or object. It is especially useful to know the bollard pull value when towing a sitting ship in rescue aid activities or lifting the ship from the pier in port operations.

Bollard Pull is, the tractive force of a tug, expressed in metric tonnes (t) or kN. This figure is not accurately determinable by mathematical methods, therefore it must be evaluated for each tug by a “Bollard Pull - Test“.

Bollard pull is the most commonly used measure of ship-assist tugs performance which have propellers optimized for maximum thrust at close to zero speed. Ships requiring high bollard pull can be fitted with a nozzle, which increases thrust by up to 20-40% compared to open propellers.

Nov 1, 2024 · For the optimal use of tugboats, it is very important to accurately estimate the required traction force (bollard pull) of tugboats and their quantity, taking into account the parameters of moored ships, the locations of berths, hydro-meteorological and hydrological conditions, and clearance (the gap between the ship’s hull and the bottom of the...