Abstract:
The aim of this study is to identify the factors causing a decrease in vacuum in the main
condenser, the impact of this decrease on the system, and the steps that can be taken to
mitigate vacuum problems in the main condenser. The method used in this study is
descriptive qualitative with an exploratory approach to describe the phenomena
occurring. The phenomenon being studied is the decrease in vacuum in the main
condenser, which has a significant impact on the performance of the main turbine. Several
factors influencing this decrease in vacuum include air leakage in the system, suboptimal
performance of the vacuum pump, the pressure and temperature of the condenser cooling
water, and operational errors. This decrease in vacuum can cause disruptions in the main
steam system and result in a failure condition (auto slowdown) in the main turbine. To
address this issue, system maintenance is necessary, and the likelihood of operational
errors should be minimized. Based on the research results, it can be concluded that the
decrease in vacuum is caused by various factors, such as steam line leaks entering the
main condenser system, poor performance of the vacuum pump, a reduction in the amount
of cooling seawater in the main condenser, an increase in cooling water temperature
influenced by environmental conditions, and errors in the operation of the turbo generator.
