🔍 Key Concepts

• Using the white pages for SS AMERICAN MARINER to find the one‑compartment standard (damaged stability) data • How adding weight in the double bottom tanks changes both displacement and the ship’s KG (vertical center of gravity) • Locating the correct allowable KG vs. displacement curve for the flooded compartment condition

💭 Think About

• From the given deck/tween/hold cargo, what is the initial displacement and KG before adding any double‑bottom liquid? • For the one‑compartment standard, which flooded condition applies to this cargo arrangement, and what allowable KG corresponds to your initial displacement on that curve? • When you add ballast in the double bottoms, how do displacement and KG move on the graph, and how can you estimate the amount of ballast that just brings KG down to the allowable line?

✅ Before You Answer

• Be sure you are on the correct damage curve and draft for the required one‑compartment standard (not the intact stability curve) • Use the tabulated vertical centers (KZ) for each cargo layer and existing tank soundings so your initial KG is correct before adding ballast • After each trial ballast amount, re‑compute KG and displacement and check where that point falls relative to the allowable KG curve; the needed ballast is where the point just meets the curve.