The DEEP DRILLER, at 58.0 feet draft in sea...

🔍 Key Concepts

• TPI (tons per inch immersion) or TPC (tonnes per centimeter) and how they relate added weight to a change in draft • Difference between long tons and metric tons, and making sure you use the correct unit in any formula • Estimating whether the change in draft seems reasonable for the size of the vessel (order-of-magnitude check)

💭 Think About

• What information (such as TPI/TPC or waterplane area) would you normally need to relate an added weight to a change in draft, and how is it used? • If 200 long tons are added, should the draft change by a very small amount, a moderate amount, or an extremely large amount for a large offshore unit like DEEP DRILLER? • After you estimate the change in draft from the added weight, how do you combine it correctly with the original draft to obtain the new draft?

✅ Before You Answer

• Confirm you are working in consistent units (long tons with TPI in long tons/inch, or convert properly). • Check that your computed draft change is not larger than the original draft – that would be unrealistic here. • Verify that the new draft you get is greater than the original 58.0 feet, since you are adding weight, not removing it.

The DEEP DRILLER, at 58.0 feet draft in sea water, places 200 long tons on board. What is the new draft?

56.55 feet

59.45 feet

60.00 feet

75.41 feet

🔍 Key Concepts

💭 Think About

✅ Before You Answer