Towing & Ship-Assist · ATB — Heavy Weather Limit
Compared with a rigid integrated tug-barge (ITB), an ATB's articulated coupling means that in heavy head seas the operator must watch for:
- ANo limitations whatsoever
- BLoss of all steering at any sea state
- CThe barge sinking the tug instantly
- DCoupling loads and the sea-state limit beyond which the tug should drop back to a hawser tow or seek shelter✓ Correct
Explanation
The pin/ram coupling has a structural sea-state limit. In severe head seas the pitching loads on the connection rise; operators monitor coupling loads and, beyond the design envelope, disengage and tow on a hawser or take shelter to protect the coupling and crew.
Authority: ATB operating references
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