A semisubmersible at a draft of 19 feet 9 inches arrives on location planning to deploy eight mooring lines. Each anchor weighs 15 long tons and each mooring line consists of 3,000 feet of 3-inch chain (89.6 lbs/ft). If no ballast corrections are made, what is the expected draft if the average TPI is 60?
Official USCG Answer & Rule Citation
Correct Answer: Option B — 18 feet 3 inches
Deploying anchors and heavy chain alters the unit's total weight. Calculating the total weight of eight anchors and chains, divided by the Tons Per Inch (TPI) immersion factor of 60, determines the draft increase and new equilibrium draft of 18 feet 3 inches.
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