"Tank Washing of Chemical Tanker"の概要〔英文〕
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概要
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A tank wash procedure on a chemical tanker was considered in this investigation. Tanks should be washed by means of a rotary water jet operated at sufficiently high water pressure and in locations to ensure that all tank surfaces are washed. The primary emphasis was placed on the development of a fundamental understanding of the tank washing that is of interest in engineering design problems. It is desired to get the relation between the concentration and the amount of washwater. As washwater had been discharged before the international convention was enforced, the problems of the tank washing have not been studied previously. This approach requires an assumed relation for ideal mixing process of the tank washing, and also depends upon experimental evidence to estimate values for coefficients to correct the assumed relation. A major objective of this investigation is to estimate the necessary quantity of the washwater. A simple analysis was performed to define the basic problem and to provide the approximate estimation of amount of the washwater. Experimental results are presented in a unified manner to facilitate the application to design problems. The experimental evidence indicated that amount of the necessary washwater was somewhat dependent upon the jet nozzle diameter that has not been previously studied by other researchers. This variation can be expected from the simple analysis and is shown to be significant in some instances. The follwing conclusions are obtained. (1) At the begining of the tank washing, the estimation of the necessary washwater by the ideal mixing model gives good agreements with the experimental results. (2) At the later half of the tank washing, it is necessary that ideal mixing model is modified by the factor of the washing efficiency or the sufficient washing is done by the recirculation of the washwater. (3) The necessary washwater quantity can be decreased by using the washing maschine with small diameter nozzles.
- 1991-05-30