What is the change in the vertical moments (excluding free surface effects) 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 C — -253 foot-kips
Transferring 2.0 feet of drill water from tank 23 to tank 6 shifts weight upward and forward, decreasing vertical moments. Calculating the exact weight moved multiplied by the vertical distance between tank centers yields a net change of -253 foot-kips.
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