A 7,000 ton displacement tankship carries two slack tanks of alcohol with a S.G. of 0.8. Each tank is 50 ft. long and 30 ft. wide. What is the reduction in GM due to free surface with the vessel floating in sea water, S.G. is 1.026?
A. 0.36 ft B. 0.46 ft C. 0.72 ft D. 0.82 ft
A. 0.36 ft B. 0.46 ft C. 0.72 ft D. 0.82 ft
For one tank:
ReplyDeleter = 0.8/1.026 =0.77972
L = 50ft
B = 30ft
12 = constant for a rectangular tank
Displaced Volume = 35 x 7000 = 245,000 cuft
FS for one tank =
0.77972x50x30^3/12x245,000 =0.35803 ft
For two tanks
FS = 2 x 0.35803 = 0.7160 ft
Choice "C." is best answer.