The SS AMERICAN MARINER has the liquid load shown in table ST-0150 below. Use the white pages of The Stability Data Reference Book to determine the LCG-FP of the liquid load.
• Use the white pages tank tables for the AMERICAN MARINER to find each listed tank’s weight (at the given loading condition) and its LCG from FP. • Recall that the combined LCG of several weights is found from the sum of longitudinal moments divided by the sum of the weights. • Port and starboard tanks with the same name (e.g., DB 2 P / DB 2 S) usually have identical LCGs, so you can combine their weights before calculating the moment if that helps.
• For each tank in table ST-0150, what are the two values you must pull from the white pages in order to form a longitudinal moment? • Once you have all the individual tank moments, what single calculation gives you the overall LCG-FP of the entire liquid load? • How can you simplify your arithmetic when P and S tanks have the same LCG but different (or same) weights?
• Confirm that every tank listed in ST-0150 is included in your moment and weight totals—none missing and none added. • Verify you are always using LCGs measured from the forward perpendicular (FP) exactly as shown in the Stability Data Reference Book, with consistent units (feet and long tons). • After computing, check whether your final LCG-FP is reasonable—it should lie within the span of the forward-most and after-most tank LCGs being used.
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