Crane heel

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Crane Heel

Crane heel is a list induced by the lifting of a load by a vessels onboard lifting devices. The heeling moment can be considerable, if the capacity of the lifting device and/or outreach are significant. For dedicated lift ships or crane barges, providing a sufficient righting arm is the primary design goal of the hullform.

Calculating

A typical method of application is; - Remove weight from deck or hold - Add weight to the hook point of the lifting device - Add any counterbalancing ballast - Add the horizontal moment and vertical moment for the weight of the lifting devices new position - Apply stability criteria - Remove the weight and solve for the new condition. If counterballasted, this will result in an opposing heel.

Considerations

Heel operations may have heel limits, typically 2-5 degrees, to prevent undue stresses on the rotational motors.

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