Test Report on Distribution of Oil in Slop Tank of Tanker

Recently all tankers should not discharge any oily water which contains more than limited value of oil, and mostly have to be arranged slop tank and adopt “Load On Top System” to cope with oil pollution. But, it is a very pity that we have not kept enough actual data of distribution of oil in slop tank during settling of oily water which was used to clean cargo oil tanks.As the first step, we carried out following on-board test on the above item when the M. S. Jingu-Maru (about 138, 000 MTDW Tanker) was on her way from Japan to Persian Gulf.The test was carried out in the duration, from May 1968 to January 1969. Consequently we got these distributions and effects by tank-heating, the type of suction pump and some emulsion-breaker during the No. 1 settling. Additionally we measured the thickness of surface oil in the slop tank, and carried out quantitative analysis of the surface oil gathered by sampling device through butterworth hole.