The SS AMERICAN MARINER is ready to bunker with drafts of FWD 14'-06", AFT 17'-00". After all bunkers are on board, soundings indicate the tonnages shown in table ST-0085 below. Use the white pages of The Stability Data Reference Book to determine the free surface correction.
• Use the Free Surface Correction (FSC) formula: FSC = (sum of free surface moments) / displacement • From the white pages for SS AMERICAN MARINER, find the free surface moment for each tank at the indicated tonnage (slack tanks only) • Be careful to use the correct displacement from the hydrostatic data based on the given drafts
• Which of the tanks listed in ST-0085 are clearly full, clearly empty, or slack when you compare their tonnages to the tank-capacity tables in the white pages? • Once you have identified the slack tanks, how do you combine their individual free surface moments into a single total free surface moment for the ship? • After you find the total free surface moment, what value from the hydrostatic tables (based on the drafts given) must you divide by to convert that into a GM correction in feet?
• Verify you are only using tanks that are slack (not pressed up and not empty) when you sum free surface moments • Confirm you use free surface moment (FSM), not weight or capacity, in the FSC formula • Double‑check that the displacement you divide by matches the draft condition specified in the problem and is taken from the correct American Mariner hydrostatic table
No comments yet
Be the first to share your thoughts!