<![CDATA[Heavy oil like Heavy Fuel Oil has characteristics of black color, contains solid particles and residues, at low temperatures is very viscous like bitumen. The density value of HFO ranges from 0.92 to 0.99 kg/L with the viscosity on the market 180 and 380 Cst. Differences in bunker locations often result in differences in technical data for the fuel supplied to the ship. The effect that often occurs from changes in the density value is the disruption of the treatment process in the purifier. The decrease in the efficiency of filling the HFO service tank due to overflow in the purifier is the main problem that often arises because of the density value. Based on the phenomena that occur in the post-bunker Heavy fuel Oil purification process, it is necessary to conduct a study in determining the gravity disc in the FO purifier. The study was conducted to provide solutions to engineers on duty on commercial ships in the event of a similar problem. The research was conducted using a case study method on real problems that occurred on board the ship. The assumptions used in solving the problem by limiting the tank where the mixing process is in the settling tank. The remaining HFO fuel in the storage tank is 0%, while the remaining fuel in the settling tank is 4 KL with a specific gravity of 0.993 kg/L from a total volume of 10 KL. HFO supplied during the bunker with a specific gravity of 0.925 kg/L. The study carried out obtained the appropriate gravity disc for HFO with a specific gravity of 0.993, 0.975, and 0.925 kg/L, respectively, 66, 75, and 78 mm. Heating temperatures of 80 and 90OC do not affect the size of the gravity disc. The performance of the purifier can be improved by preventing overflow through a suitable gravity disc determination.]]>
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