IMO Resolution A167, 1968, Res. No. 749(18)...

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Question 1 of 205eccef9fbacbc34ba4d46a04

IMO Resolution A167, 1968, Res. No. 749(18) 3.1 (1995, amended 1999), and section 2.2 in the 2008 IS Code, sets the general criterion for vessels of more than 100 meters in length. Your vessel is covered by this regulation. In review of your vessel's stability data, after refueling you notice that the GM of the vessel is less than the required 0.15 meters. What should you instruct the 2nd engineer to do with the fuel just received?

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🔍 Key Concepts

• GM (metacentric height) and its relationship to KG (height of the center of gravity) • How moving fuel vertically (from low tanks to high tanks or vice versa) affects KG and thus GM • Effect of free surface in slack tanks on stability and why minimizing free surface is usually desirable

💭 Think About

• If GM is too small (below the required minimum), do you want KG to go up or down to correct that? Recall the relationship: GM = KM - KG. • Think about where the newly received fuel likely is: in which tanks (high/low, wing/center) would it be best kept or moved to improve stability and meet the GM requirement? • How does the free surface effect change if tanks are pressed full, empty, or left slack, and which of those conditions is best when you are trying to improve GM?

✅ Before You Answer

• Verify that increasing KG makes GM smaller, and lowering KG makes GM larger, using GM = KM - KG. • Check which tank condition (pressed full, empty, or slack) gives the maximum free surface effect and which gives the minimum. • Confirm the required minimum GM in the cited criteria (0.15 m) and compare it with the distractor value given in one of the choices.

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