The COASTAL DRILLER is loaded as shown in the Sample Load Form #1 (Rig Move). What is the new LCG if the entire contents of drill water tanks 6 and 7 are discharged?
• Longitudinal Center of Gravity (LCG) and how removing a weight affects it • Using the total moments ÷ total weight method to find a new LCG • How to treat multiple tanks being discharged completely (weight and moment changes)
• When you remove weight from a ship, how does that change the total weight and total longitudinal moment? • What happens to the ship’s overall LCG if the removed weight was located aft of the original LCG versus forward of it? • How do you combine the effects of emptying two tanks at different longitudinal positions into one overall change in LCG?
• From Sample Load Form #1, note the LCG position and weight of drill water tanks 6 and 7 • Recalculate the new total weight and new total longitudinal moment after discharging these tanks • Compute the new LCG as (sum of remaining moments) ÷ (sum of remaining weights) and compare carefully with the choices
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