What is the increase in transverse free surface moments for the COASTAL DRILLER if 2.0 feet of drill water is transferred from a full drill water tank 23 to an empty drill water tank 6?
Official USCG Answer & Rule Citation
Correct Answer: Option B — 3,914 foot-kips
Free surface moments (FSM) vary with the surface area and geometry of the tanks in use. Transferring 2.0 feet of drill water from tank 23 to tank 6 increases transverse free surface moments by 3,914 foot-kips due to shifting slack liquid planes.
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