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 has a zero speed in the forward direction.
Bollard pull is calculated by connecting a pier bollard with a towing mechanism on the vessel and computing the force or tension developed in the connection using a load cell or similar component.
During the bollard pull test, recording the tug’s displacement, draft, and trim is necessary to note in the bollard pull certificate. The tug draft should be as per the tug’s construction waterline level to ensure adequate propellers’ immersion. The trim of the tug should comply with the intended operating trim. Typically, the tug will be trimmed on an even keel or with a stern trim.
Tug deck equipment that will be utilized during the testing, such as towing winch and drum, towing hooks and strong backs, fairleads, etc., must be in good condition and capable of handling the anticipated load of “Maximum Bollard Pull” with suitable safety factor.
6 сен 2024
