The COASTAL DRILLER is loaded as shown in...

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Question 1 of 2066636ee728f7522a1c517732

The COASTAL DRILLER is loaded as shown in the Sample Load Form Number 1 (Rig Move). If the contents of 6 and 7 drill water tanks are discharged, what is the new height of the center of gravity corrected for longitudinal free surface effects?

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Question 1 of 20

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🔍 Key Concepts

• Vertical center of gravity (KG) changes when weights are removed or added • Effect of discharging liquids on displacement and free surface moments • How to apply the free surface correction (FSC) to get a corrected KG

💭 Think About

• First, think about what happens to the ship’s displacement and KG when you discharge the contents of two tanks: does KG go up or down? • Next, consider how removing liquid from these tanks affects the free surface moment: do you still have free surface in those tanks afterward? • After computing the new uncorrected KG, ask yourself how to apply the longitudinal free surface correction to reach the corrected KG value that matches one of the choices.

✅ Before You Answer

• Verify the weight and KG (or vertical location) of the liquid in tanks 6 and 7 from Sample Load Form 1 before discharge • Check whether tanks 6 and 7 are full, slack, or empty before and after discharge, since this affects the free surface correction • Confirm that you recalculate the final KG corrected for free surface (KG + FSC or KG − FSC as appropriate) before comparing to the answer choices

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