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 2 of these tanks being slack?

Correct Answer: Option D — .87 foot

Slack tanks degrade vessel stability by creating virtual weight shifts. Evaluating two 30'L by 15'B liquid mud tanks with a mud specific gravity of 1.8 on a 968-ton vessel determines the resulting metacentric height reduction to be 0.87 foot.