While the COASTAL DRILLER is in transit at a draft of 10 feet 6 inches, a severe storm is predicted within 12 hours. VM are 520,462 ft-kips, FSML are 26,000 ft-kips, and FSMT are 25,000 ft-kips. How much should the KG corrected for free surface effects be lowered to satisfy the maximum allowable KG criteria?
⢠Virtual Metacenter (VM) and how it relates to maximum allowable KG ⢠Effect of free surface moments (FSM) on KG correction ⢠How to compute KG corrected for free surface using given data (VM, FSML, FSMT)
⢠How does the free surface in multiple tanks change the vesselâs effective KG compared to the âdry tankâ condition? ⢠Which formula links VM, total free-surface moments, vessel displacement, and KG or KG correction? ⢠Once you find the maximum allowable KG (including free surface), how do you compare it with the current KG to determine how much KG must be lowered?
⢠Be clear whether VM is measured above keel and how KG is defined in the stability booklet problems. ⢠Combine FSML and FSMT to get a total free surface moment before using it in any formula. ⢠Check units carefully (feet, kips, long tons) and confirm that any KG change you compute is in feet, then compare the difference from the current KG to the maximum allowable KG.
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