A semisubmersible at a draft of 19 feet 9...

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Question 1 of 2066636ee728f7522a1c518884

A semisubmersible at a draft of 19 feet 9 inches arrives on location planning to deploy eight mooring lines. Each anchor weighs 15 long tons and each mooring line consists of 3,000 feet of 3-inch chain (89.6 lbs/ft). If no ballast corrections are made, what is the expected draft if the average TPI is 60?

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Question 1 of 20

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🔍 Key Concepts

• TPI (tons per inch immersion) and how it relates added/removing weight to change in draft • Converting long tons to pounds and computing total weight of anchors and chain • Difference between weight added vs weight removed when deploying anchors and mooring lines

💭 Think About

• First, decide whether the total weight of anchors and chains is being added to the semisubmersible or taken off the semisubmersible when they are deployed. How does that affect draft? • Compute the total weight of all 8 anchors and all 8 lengths of chain in pounds, then convert to tons, and divide by TPI to find the change in draft in inches. • After you find the change in draft, apply it in the correct direction (more or less draft) to the original 19 ft 9 in to see which choice is reasonable.

✅ Before You Answer

• Be sure you are using long tons (2,240 lb), not short tons (2,000 lb), in all conversions. • Confirm that you correctly converted feet of chain × lb/ft into total pounds, then to long tons. • Double-check whether the semisubmersible becomes lighter or heavier after deployment and whether the draft should increase or decrease accordingly.

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