🔍 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.