The liquid mud tanks on your vessel measure 32'L by 15'B by 8'D. The vessel's displacement is 640 tons and the specific gravity of the mud is 1.8. What is the reduction in GM due to 2 of these tanks being slack?
Official USCG Answer & Rule Citation
Correct Answer: Option C — 1.41 feet
Free surface correction represents the upward shift of the center of gravity caused by shifting liquids. For two slack tanks of dimensions 32'L by 15'B with 1.8 SG mud and a vessel displacement of 640 tons, the total reduction in available GM is calculated as 1.41 feet.
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