The DEEP DRILLER is operating as shown in...

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Question 1 of 2066636ee728f7522a1c517920

The DEEP DRILLER is operating as shown in Sample Load Form #4 (Drilling). Assume ballast added or discharged to remain at a constant draft is at a VCG of 10 feet. How much non-liquid load would have to be removed from an average height of 130 feet above the keel to meet the maximum allowable KG at a draft of 60 feet for winds greater than 70 knots?

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🔍 Key Concepts

• Maximum allowable KG from the stability curves/tables at 60 ft draft and >70 knots wind • How removing weight high and adding ballast low (at 10 ft VCG) changes the vessel’s KG • Using a constant displacement / constant draft weight–moment calculation

💭 Think About

• From Sample Load Form #4, determine the present displacement and actual KG at 60 ft draft. How does this compare with the maximum allowable KG for winds >70 knots? • If you remove X long tons at 130 ft and, to keep the draft constant, add ballast at 10 ft, what is the net change in total vertical moment? How does this net change affect KG? • Express the needed reduction in KG as a required reduction in total vertical moment, then solve for X using the moment arms (130 ft and 10 ft).

✅ Before You Answer

• Be sure you are using long tons consistently for all weights and tons in the load form and answer choices. • Confirm that you are holding displacement (draft) constant: the total weight after removing deck load and adding ballast should equal the original displacement. • Double-check your KG change formula: ( \Delta KG = \frac{\Delta\text{Total Moment}}{\text{Displacement}} ), with the correct sign for removing high weight and adding low weight.

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