The DEEP DRILLER is loaded as shown in the Sample Load Form #3 (Preparing to Drill). If the liquid mud in mud pit #4 (see table 8) is dumped, what would be the new height of the center of gravity corrected for longitudinal free surface effects?
ā¢ Longitudinal center of gravity (LCG) and vertical center of gravity (KG) changes when weight is removed ā¢ Effect of dumping a tank with free surface on the free surface correction (FSC) you must apply ā¢ How to use the sample load form and Table 8 data to recompute total moments and corrected KG
ā¢ When you dump mud pit #4, does the total displacement go up or down, and what does that usually do to KG if you are removing a weight high or low in the unit? ā¢ Does removing a slack tank increase or decrease the total free surface moment you must correct for? How does that affect the corrected KG value? ā¢ Step through: original total vertical moment and displacement ā subtract the tankās weight and its moment ā recalc KG ā then apply the new total free surface correction. In which direction should the corrected KG move?
ā¢ From Sample Load Form #3, identify the exact weight and VCG/LCG of mud in pit #4 and compute its vertical moment before dumping it. ā¢ From Table 8, find the free surface moment (FSM) for mud pit #4 and determine how the total FSM changes after dumping. ā¢ After you recompute the new KG and apply the reduced or increased FSC, check whether the final corrected KG is higher or lower than the original; eliminate choices that move in the wrong direction.
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