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The impurities or dirt level is one of quality standard of crude palm oil processing, the level of impurities or dirt level is measured at clarification station especially at oil tank. Recent dirt level in crude palm oil at palm oil mill was still higher than standard level, it was about 0.036%. The objective of this research was to decrease the level of dirt content in Crude Palm Oil (CPO) production by modified the inlet pipe and installed automatic drain on oil tank. The method used in this research were analysed of feeding oil, level of dirt content and technical analysed by calculated the hydrostatic pressure on oil tank. This research showed that the average of dirt on feeding oil to oil tank was 0.056%. The average of dirt level on CPO production before modification was 0.038%, and after modification of inlet pipe, it was 0,031%. The rate of flow of oil into the oil tank was 20.2 tons/h, the volume of oil tank was 16.60 ton, while the retention time in the oil tank was 0.82 hours. Based on technical analysis, the results showed that hydrostatic pressure of CPO within oil tank was 16,770 N/m2 and hydrostatic pressure of sludge was 19,531.46 N/m2. This indicated by the CPO hydrostatic pressure that still smaller than the sludge hydrostatic pressure.