🔍 Key Concepts

• Use the Stability Data Reference Book white pages for SS AMERICAN MARINER damaged stability problems, not the worked examples in the front. • Recall what the one-compartment standard means: the ship must meet required stability after flooding any single designated compartment (here, a double bottom tank). • Pay attention to how the vertical distribution of cargo (deck, tween decks, hold) affects the vessel’s KG, and how adding liquid in the double bottoms changes KG and draft.

💭 Think About

• From the cargo layers shown, how will the combined vertical center of gravity (KG) compare with lightship KG? Higher or lower? What does that suggest about the need for additional low weight? • When you enter the Damage Stability (one-compartment) tables for this loading, which column or curve tells you the required double-bottom loading to meet the standard? • As you add liquid in the double bottoms, what happens to GM and to the limiting KG allowed by the standard? Where do you see this change in the tables?

✅ Before You Answer

• Verify you are using the correct displacement column that corresponds to the total loaded displacement (lightship + all cargo) before adding any tank liquid. • Make sure you use the cargo vertical centers given in the reference book (heights above baseline) to compute KG, not assumed or guessed values. • Before choosing an answer, confirm that the amount of liquid you select brings the actual KG at or below the allowable KG for the worst-case one-compartment damage condition in the tables.