While the COASTAL DRILLER is in transit at a...

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Question 1 of 2066636ee728f7522a1c517750

While the COASTAL DRILLER is in transit at a draft of 10 feet 6 inches, a severe storm is predicted within 12 hours. GMT is 98.89 feet. How much should the KG corrected for free surface effects be lowered to satisfy the maximum allowable KG criteria?

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Question 1 of 20

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🔍 Key Concepts

• Use the relationship GM = KM − KG and how it changes when KG is raised or lowered • Difference between present KG corrected for free surface (KGcfs) and the maximum allowable KG for the storm condition • How storm criteria are usually expressed: either as a minimum GM or as a maximum allowable KG at a given draft

💭 Think About

• First, from the vessel’s stability data, identify the required GM or maximum allowable KG at the given draft for a severe storm condition. How do you turn a required GM into a maximum allowable KG? • Next, calculate or locate the vessel’s current KG corrected for free surface at this draft. How does free surface correction affect KG and GM? • Finally, compare the current KGcfs with the maximum allowable KG. How do you turn that comparison into the number of feet the KG must be lowered?

✅ Before You Answer

• Make sure you are using KG corrected for free surface effects (KGcfs), not the uncorrected KG • Verify that you’ve used the correct KM value for the 10 ft 6 in draft from the hydrostatic/stability data, if needed • Check the sign of the difference: if KGcfs is already less than or equal to the maximum allowable KG, then no reduction in KG is required

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