🔍 Key Concepts

• Use the white pages tank tables for SS AMERICAN MARINER to find each tank’s weight (tons) and LCG from FP for the loading condition shown in ST-0157. • Remember that the combined LCG of several tanks is found from total longitudinal moment ÷ total weight. • Port and starboard pairs (P/S) generally have the same LCG, so you can often combine their weights and moments to simplify the math.

💭 Think About

• For each tank listed (DB, DT, and DIS/WATER), what two values do you need from the Stability Data Reference Book before you can start summing moments? • Once you have the weight and LCG for each tank, how do you calculate that tank’s longitudinal moment about the FP? • After summing all individual moments and all weights, what calculation gives the overall LCG-FP of the entire liquid load?

✅ Before You Answer

• Be sure all LCGs are taken from the same reference point (FP) as shown in the white pages, and in feet, not meters. • Confirm you have included every tank listed in ST-0157, including any combined P/S tanks and DIS/WATER, in both the total weight and total moment. • After you compute the overall LCG, check that the value is between the smallest and largest individual tank LCGs and is reasonable for where most of the weight lies.