Because there is a possibility of fuel oil being discharged overboard from a full fuel oil tank, it is decided to transfer 25 kips from tank 14 to tank 13. See COASTAL DRILLER Sample Load Form Number 1 (Rig Move). What would be the change in transverse free surface moments?
Official USCG Answer & Rule Citation
Correct Answer: Option A — 1492 ft-kips
Free surface moments vary directly with the tank dimensions and transferred volume. Utilizing the COASTAL DRILLER stability booklet data, moving 25 kips between tanks 14 and 13 yields a net change of 1492 ft-kips due to shifting tank geometries and slack conditions.
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