Gas Removal System (GRS) is vital in geothermal power plants since steam flows into the turbine and the condenser still has a certain amount of Non-Condensable Gas (NCG). The effect of the NCG will increase the pressure in the condenser so that it will affect the power generation performance of the Geothermal Power Plant (GPP). The types of equipment used in GRS are steam jet ejectors dan Liquid Ring Vacuum Pumps (LRVP). The existing configuration of GRS in this GPP uses a hybrid system for Train A and Train B, which consists of 2 stages for steam ejector and 1 stage for LRVP. This study aims to see the opportunities for motive steam reduction in the GRS by modifying the GRS configuration system using only 1 stage steam ejector and 1 stage LRVP on Train A and Train B. The research method used is to calculate the capacity of the LRVP based on data from the manufacturer and actual data processing in the field. The results of this study indicate that the LRVP capacity is still above the NCG flow rate. Therefore, it can still pull a certain amount of NCG from the condenser. Economically, the motive steam that can be saved from this modification is 11,724 kg/hr or equivalent to 3,26 MW generation.

Keywords : Geothermal, Gas Removal System (GRS), NonCondensable Gas (NCG), Liquid Ring Vacuum Pump (LRVP), motive steam.