The liquid mud tanks on your vessel measure 20'L by 18'B by 7'D. The vessel's displacement is 986 T and the specific gravity of the mud is 1.6. What is the reduction in GM due to 2 of these tanks being slack?

Correct Answer: Option C — .88 foot

Liquid shift inside slack tanks diminishes a vessel's initial stability. Calculating the total free surface moment for two tanks measuring 20'x18'x7' containing 1.6 SG mud on a 986 T vessel produces a net transverse metacentric height reduction of 0.88 foot.