@thesis{thesis, author={Sudirmanto Sudirmanto and Wantoro Ikhsan Dwi}, title ={Analisis Efisiensi Boiler Sebelum dan Setelah Overhaul di Unit 3 Suralaya}, year={2019}, url={http://156.67.221.169/620/}, abstract={Many researchers have conducted research to improve boiler efficiency. Boilers are one of the most important components of a Steam Power Plant. The increase in boiler efficiency is directly proportional to the increased efficiency of Steam Power Plants. So by using the heat energy of the flue gas from the combustion process to reheat in the Boiler. there are problems about the effect of combustion gases on the environment. the input-output method and the Heatloss method are used to find and analyze boiler efficiency. The discussion of efficiency calculations using different time periods. With that, it will be known where the factors that influence the efficiency of the boiler. This relates to emissions resulting from combustion, which can be analyzed to reduce the impact on the environment. This method is used to determine the loss of heat in combustion. the usage period of coal will affect the combustion yield. By providing variations in data differences with time, it can be seen the effect on boiler efficiency. Overhaul can affect boiler efficiency. the calculation of the load at 100% boiler efficiency increased efficiency by 0.175%, while at 75% load experienced a decrease of efficiency of 0.46%.} }