The liquid mud tanks on your vessel measure 30'L by 15'B by 6'D. The vessel's displacement is 968 T and the specific gravity of the mud is 1.8. What is the reduction in GM due to a pair of these tanks (p/s) being slack?
⢠Free Surface Effect (FSE) and how slack tanks reduce GM ⢠Formula for virtual rise in G due to FSE: free surface moment divided by displacement ⢠Effect of specific gravity (SG) of the liquid on the free surface moment
⢠How do you calculate the free surface moment of a rectangular tank using its breadth and dimensions? Which dimension matters most for FSE? ⢠How does having two identical tanks (port and starboard) change the total free surface moment? ⢠Once you find the total free surface moment, how do you convert that into a reduction in GM using the vesselâs displacement?
⢠Be sure to use the correct breadth of the tank in the free surface formula (not the length or depth). ⢠Convert all terms to consistent units (e.g., long tons, feet) before solving. ⢠Remember to multiply by the specific gravity of the mud and to account for both tanks when finding the total effect on GM.
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