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Crude Distiller Unit(CDU) is a key in oil and gas industry. CDU is usually the first processing equipment through which crude oil is fed, then the product serve as feedstocks for all other processing units at the refinery. The product of CDU such as crude butane, SR tops, Naptha II, Naptha III, Naptha IV, LKD, HKD, LCT, HCT, and feed high vacuum unit. SR tops from column 3-1 was condensed and flow to secondary process as feed. Type of condenser is vertical with condensation at outside tube. SR tops through shell and cooling water in tube. Fouling is one of a factor reduction heat transfer coefficient. Fouling is accumulation from deposit material at the wall heat transfer. Observation and interview’s method used to get actual operating condition of condenser 5-1.  Meanwhile reference method to get another data for calculation and study literature for make relation between result and theory. The Result of actual data show condenser should be cleaning about 39 months. This is compatible with theory operating time condenser about 3-4 years until next cleaning. Meanwhile, changed the cooling water from river water to treatment water make long operating time of condenser until 137 months. This is shown that changed cooling water have big influenced to increasing heat transfer coefficient.So for the optimal operation cooling water should change with treatment water.

Monitoring fouling dan jadwal pembersihan condenser dalam crude distiller unit pada pabrik pengilangan minyak bumi