Experiments on tsunami force and pressure acting on oil tanks were carried out with scale factor of 1/40. The tsunami concerned is that due to Tokai, Tonankai and Nankai earthquakes and the maximum water level is about 5 m high. If the tanks of which diameter ranges from 5.8 m to 48.6 m and weight from 5.8t to 540t are empty, they can be floated due to the 2-m high tsunami flooding. Pressure acting on tanks surrounded by oil protection walls is not uniform and buckling of side wall is affected by the distribution of pressure around the tank. The lowest level of oil in the tank should be kept to prevent the tanks from floating and buckling.
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