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Bollard Pull Trial Code
For Tugs With Steerprop Propulsors

Trial Site and Vessel Requirements

Wind Speed

Requirement
The wind speed during the trials shall not exceed 5 m/s.

If wind gusts causes the vessel to yaw significantly the test should be stopped and repeated.

Current

Requirement
The trials should be conducted in waters with no current, wherever possible. The current must not exceed 1 knot (a current of 1 knot from the bow correspond to a drop in bollard pull of approx. 4 %).

In areas with tidal current special attention has to be taken in the timing of the trials. The trials should be started 1 …1.5 hours before high tide, when the current speed is less than 1 knot and the water level only slightly below maximum. This timing allows for a retrial if required. Trials after high tide should be avoided. During the trials the direction of the current should be from the stern. Current from the bow or from the side are not acceptable, see figure.