The COASTAL DRILLER, in transit with winds...

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Question 1 of 2066636ee728f7522a1c51775f

The COASTAL DRILLER, in transit with winds less than 70 knots, has a draft of 10 feet 8 inches. The VM are 541,257 ft-kips, FSML are 32,000 ft-kips, and FSMT are 24,000 ft-kips. The margin on the maximum allowable KG is __________.

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Question 1 of 20

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🔍 Key Concepts

• Virtual rise of G (VG) due to free surface effect in both longitudinal and transverse tanks • How to compute a new allowable KG using VM (maximum allowable vertical moment) and total displacement moment, including free surface moments • Interpreting a negative margin on allowable KG vs a positive margin

💭 Think About

• First, think about how you combine VM, FSML, and FSMT. Are you supposed to add or subtract the free surface moments from the allowable vertical moment before dividing by displacement? • Once you have the adjusted maximum allowable KG, compare it to the vessel’s actual KG. How do you turn that comparison into a ‘margin’ value, and what sign (positive/negative) should it have? • Look at the answer magnitudes: which answers are realistic for a KG margin on a jack‑up or drilling unit with a draft a little over 10 feet?

✅ Before You Answer

• Be sure whether FSML and FSMT must both be included in the same calculation for this condition of loading. • Confirm that units are consistent (ft‑kips, tons, feet, etc.) and that you divide the correct total moment by the correct displacement. • Double‑check whether margin = allowable KG − actual KG or the reverse, and how that affects the sign of the result.

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