The SS AMERICAN MARINER is loaded with the cargo shown in table ST-0128 below. Use the white pages of The Stability Data Reference Book to determine the amount of liquid loading required in the double bottom tanks to meet a one compartment standard.
• Use the one compartment standard curves for SS AMERICAN MARINER in the white pages, not the damage stability tables in the gray pages. • Determine the ship’s displacement and KG for the given vertical cargo distribution (deck, tween decks, hold). • From the one-compartment curves, find the required minimum GM (or maximum KG), then use the double bottom tank capacity curve to see how much liquid must be added to reach that condition.
• First, with the cargo weights given, what is the ship’s initial KG before putting any liquid in the double bottom tanks? Which white‑page diagram lets you find this quickly? • Once you know that KG, how do you compare it to the allowable KG/required GM for the one-compartment standard at that displacement? • After you know how much you need to lower KG, which curve in the white pages shows how KG changes as you fill the double bottom tanks, and how do you read off the tons required?
• Make sure you are using the correct displacement line on both the KG/GM and one-compartment standard curves for this loading. • Verify that you are reading tons of liquid in double bottoms, not percent filling or tank volume. • After choosing a tentative answer, mentally confirm that the added liquid would move the KG in the right direction (downward) and by a reasonable amount for the weight added.
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