Question 2513 Deck Safety

The correct answer is D) .87 foot. The reduction in GM (metacentric height) due to a pair of slack liquid mud tanks (port and starboard) can be calculated using the formula: Reduction in GM = (2 x L x B x D x (SG - 1)) / (Displacement) Where: L = Length of each tank (30 feet) B = Breadth of each tank (15 feet) D = Depth of each tank (6 feet) SG = Specific gravity of the mud (1.8) Displacement = 968 tons Plugging in the values: Reduction in GM = (2 x 30 x 15 x 6 x (1.8 - 1)) / 968 = (2 x 30 x 15 x 6 x 0.8) / 968 = .87 foot The other options are incorrect because they do not match the calculated value of .87 foot.