The DEEP DRILLER is loaded as shown in the Sample Load Form #5 (Survival), when an unexpected, slowly increasing port list and bow down trim occurs. A leak in C1P is found. By deballasting from ballast tanks 2P and 3P, the inclination slowly decreases. The increase in the longitudinal free surface correction is __________.
ā¢ Free surface effect and how it impacts GM and trim on a semisubmersible / drill unit ā¢ How longitudinal free surface correction is obtained from the load form or hydrostatic tables when specific ballast tanks are slack or emptied ā¢ Effect of deballasting specific wing tanks (2P and 3P) while you already have a damaged tank (C1P) on the total free surface corrections
ā¢ Look at Sample Load Form #5 and identify which tanks initially contribute to the longitudinal free surface correction and by how much ā¢ Determine which tanks are still slack (partly filled) after deballasting 2P and 3P, and note any changes in their free surface values compared with the original condition ā¢ Calculate the change between the original total longitudinal free surface correction and the new total after the deballasting sequence; compare that difference with the answer choices
ā¢ Verify you are using the longitudinal free surface correction column on the load form, not the transverse one ā¢ Confirm whether tanks 2P and 3P go from slack to empty (no free surface) or to pressed up (completely full) in this survival condition and use the correct values ā¢ Doubleācheck that you are summing all applicable tank corrections before and after deballasting and that the difference (increase) matches one of the options
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