The DEEP DRILLER, at a draft of 60 feet, has...

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Question 1 of 2066636ee728f7522a1c517897

The DEEP DRILLER, at a draft of 60 feet, has 50,000 ft-tons of longitudinal moments. How much ballast should be transferred between tanks 1P and 10P to level the unit longitudinally?

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Question 1 of 20

66636ee728f7522a1c517897

The DEEP DRILLER, at a draft of 60 feet, has 50,000 ft-tons of longitudinal moments. How much ballast should be transferred between tanks 1P and 10P to level the unit longitudinally?

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🔍 Key Concepts

• Longitudinal moments and trim – how total longitudinal moment relates to the vessel’s trim about the center of flotation • Effect of shifting weight – how moving a given weight between two tanks creates (or removes) a trimming moment: weight × distance moved • MT1" (moment to change trim 1 inch) – how to use this value (from the stability data booklet) to find the weight needed to correct a given trim or moment

💭 Think About

• Start by thinking: the unit currently has 50,000 ft-tons of longitudinal moment. What does that tell you about the trim that must be corrected? • Ask yourself: when you transfer ballast from tank 1P to 10P (or vice versa), what is the effective distance that weight is moved fore‑and‑aft, and how does that create a trimming moment? • Use the idea that the trimming moment produced = weight shifted × distance moved. What weight shift would produce a moment equal and opposite to 50,000 ft-tons?

✅ Before You Answer

• From the stability booklet/data tables, identify the longitudinal separation (in feet) between tanks 1P and 10P, or their distances from the longitudinal center of flotation (LCF). • Confirm the correct sign and direction: are you moving weight forward or aft to counteract the existing moment? This affects whether you add or subtract moments. • After computing the required weight transfer using moment = weight × distance, recalculate the net longitudinal moment to verify it is approximately zero (i.e., the unit is level).

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Question 1 of 2066636ee728f7522a1c517897

The DEEP DRILLER, at a draft of 60 feet, has 50,000 ft-tons of longitudinal moments. How much ballast should be transferred between tanks 1P and 10P to level the unit longitudinally?

Back

Question 1 of 20

66636ee728f7522a1c517897

The DEEP DRILLER, at a draft of 60 feet, has 50,000 ft-tons of longitudinal moments. How much ballast should be transferred between tanks 1P and 10P to level the unit longitudinally?

No comments yet

Be the first to share your thoughts!

If the question has a related picture, it will appear here.

🔍 Key Concepts

💭 Think About

✅ Before You Answer

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