@thesis{thesis,
		author={Edy  Jasmid and Hutomo  Iqbal Imam Ali},
		title ={Pengaruh preventive Maintenance Oil Cooler Terhadap Penurunan Temperatur Thrust Bearing di Unit 3 PLTU Sektor Pembangkitan Bukit Asam},
		year={2018},
		url={http://156.67.221.169/2057/},
		abstract={Oil Cooler is one of the equipment of the cooling system which serves to cool the oil used to lubricate and cool the Thrust Bearing. The media used for cooling is the pumped water. Cooling wa ter pump so that heat transfer occurs from low temperature (water from the cooling tower) cools the high temperature (oil from thrust bearing). Heat transfer in this cooling system is heat transfer by convection. If the Oil Cooler has a malfunction when the unit operates, it will cause excessive heat on the Thrust Bearing. This will cause damage to the equipment, especially in the bearing system and turbine shaft. If this continues, it can result in a unit trip. To prevent this from happening in the Oil Cooler, it is necessary to have Preventive Maintenance, which is the maintenance of the equipment at the right time at the right time based on the information collected through monitoring conditions to optimize the performance and life of the equipment. After obtaining the results from before after Preventive Maintenance, the data is calculated using the LMTD (Logarithmic Mean Temperature Difference) method, which is the logarithmic average of the temperature difference between heat (lubricant) and cold (water) at each end of the Oil Cooler. From the results of these calculations we can compare the difference in heat transferred in the oil cooler where the greater the LMTD, the more heat is transferred. Where is the result before preventive maintenance oil cooler is 10.969oC, 11.434oC, 11.434oC. with a logarithmic average value (LMTD) before preventive maintenance 11,279oC and data after preventive maintenance oil cooler treatments namely 9,966oC, 10,428oC, and 10,969oC. with a logarithmic average value (LMTD) at oil cooler 10,454oC. From the results of preventive maintenance, the oil cooler has a temperature drop in the lubricant so that the lubricant coming out of the oil cooler has dropped, and the temperature thrust bearing also drops. So that the turbine can increase loading.}
		}