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?
⢠Trim = Moment / MT1" relationship for longitudinal weight shifts ⢠How to calculate a trimming moment when a weight is moved fore or aft ⢠The effect of vessel length (300 ft) when converting a trim in inches to feet
⢠First, how do you compute the trimming moment caused by moving a 263 long ton weight 12 feet aft? What are the units of that moment? ⢠Once you have the trimming moment, how is MT1" (87.67 ft-tons) used to find the total trim in inches? ⢠After you get the total trim in inches, what simple conversion is needed to express the answer in feet, and how does that relate to the multiple-choice options?
⢠Be sure to multiply weight à distance moved (in long tons and feet) to get the trimming moment. ⢠Confirm you are dividing the trimming moment by MT1" (in ft-tons per inch) to obtain total trim in inches, not feet. ⢠Convert inches of trim to feet of trim by dividing by 12, then compare carefully with the answer choices.
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