Oil Spills from Model Tanks with Double Hull-IV : Effects of Tank Inclination on Oil Outflow

Abstract

The amount of oil outflow from the inclined bottom damaged model tank with double hull to still water is measured. The 1/50-scale model tank simulated midship section of VLCC is used. The oil outflow is occurred due to (1) the difference between the static pressure in the tank and surrounding water at the bottom damage, and (2) the displacement of oil contained in the double hull space below the damage by water. The experimental results show that (1) the amount of oil outflow is increased with increasing the difference between draft and oil level, and (2) the amount of oil outflow from the inclined double hull tank is larger than the non-inclined double hull tank. The method to predict the amount of oil outflow proposed in the previous report for the non-inclined tank is applied to inclined tank. A comparison of prediction with experimental data shows a satisfactory agreement.