Abstract
On the tank washing of chemical tankers, it is desired to establish the tank washing standard for the prevention of sea pollution and to minimize the necessary wash water quantity. We investigate the cleanliness of the tank wall surfaces after washing and the concentration in the effluent. Red dyed alkylbenzene is used as the test liquid. After it is adhered to the tank wall, it is washed with jet water which contains detergent. Two sections are determined to examine the cleanlines after washing on the wall surfaces. One is the ceiling near the corner that is most difficult to wash and another is ther vertical wall that is easy to wash. The washing with the detergent is compared with that with fresh water.In the case of washing of alkylbenzene which is insoluble in water and low in viscosity, the necessary wash water quantity is decreased by using detergent. It is estimated by the coefficients obtained by the model tank test that if the ditergent is toxic, the necessary water quantity is decreased by about 13% and if it is not toxic, it is decreased by about 31%.
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