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He said they also filled the ballast tanks to keep the ship stationary.
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Depending on the situation, we would sometime flood the bilges of barges, to stabilize them, or flood the bilge and sink a barge mounted crane to increase lifting capacity..
The capacity of these huge cranes is a moveable target, flood the bilge and get the barge on the bottom increases the capacity...And some of these cranes are so old they have no nannies....
Modern cranes will shut down, or refuse to allow a lift if over capacity.. the have stain/ load gauges in the boom or winch, and a computer that knows load, boom angle, boom extension... and if the criteria exceeds a threshold, the operator cant lift..
Live stream of the demo....like watching water boil...