A semisubmersible 300 feet long and an LCF of 0 (amidships) is in transit with hulls awash and an MT1" of 87.67 foot-tons. Work on the BOP (weight 263 long tons) requires that it be moved aft 12 feet. What is the resulting trim change?
Official USCG Answer & Rule Citation
Correct Answer: Option B — 3.0 feet
Trim change is calculated using the formula Trim Change = (Weight * distance moved) / MT1". Shifting a 263 long ton BOP 12 feet longitudinally on a vessel with an MT1" of 87.67 foot-tons yields a 3.0-foot change in trim.
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