After jacking down your liftboat you have an unexpected list. You find that the only cause of this list must be a flooded leg. To keep adequate stability you should __________.
• stability of liftboats and jack-up rigs when a leg is flooded • effect of ballast on list and stability (GM and KG) • risks of underway operations with damaged or flooded legs
• Which option lets you correct the list while the vessel is still supported safely and not moving through the water? • How does adding or removing ballast on the high or low side affect list and overall stability when one leg is flooded? • Which choices would increase risk by combining leg damage with transit or partially raised legs?
• Identify which options involve getting underway with a known structural problem and ask if that is safe or typical practice. • Decide whether completely pumping out ballast will really help when the list is caused by a flooded leg, not internal tanks. • Consider which option keeps the unit in the safest operating mode (afloat vs. jacked up) while you correct for the list.
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