The DEEP DRILLER at a draft of 60.0 feet discharges 68.94 long tons of ballast. What is the new draft?
• TPI (Tons Per Inch Immersion) for this vessel and how to use it • Relationship between weight removed and change in draft • Unit consistency: long tons, inches, and feet
• If you remove weight, will the draft increase or decrease? Visualize how the vessel sits in the water. • About how many inches of draft change would you expect per long ton on a large offshore unit like DEEP DRILLER? Does 68.94 LT give a big or small change? • Once you estimate the total change in inches, how do you convert that to feet and apply it to the original 60.0-foot draft?
• Make sure you are using the correct TPI value given elsewhere on the exam/reference sheet for DEEP DRILLER. • Ensure you convert inches of draft change to feet before comparing with the answer choices. • Confirm that your final draft direction (more or less draft) matches the fact that ballast was discharged (removed), not added.
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