Adjustment Of Logic Operational Of Chemical Injection Pump In Ph Control Of Water Steam Cycle To Improve Steam Turbine 5.8 Reliability Of Power Plant Pt. Pjb Up Muara Tawar

Water quality in power plant is the main factor of equipment reliability. Standard water quality can assure performance of equipment and minimize equipment defact especially from corrosion. In Block 5 UP Muara Tawar, water is used to producing steam from HRSG. Actually pH for HP drum is 30% above the upper limit. To overcome this problem, it is needed to do some adjustment with the method as follows: data collection from process information system, brainstorming with operation, engineering and instrumentation to improve quality of water for short and long term period of operation, perform temporary corrective maintenance by Operate CBD in higher opening Operate phospate chemical injection manually based on pH set point or regulate based on time, literature review about logic system of phospate chemical injection in drum and make a research plan to find source of problem. From adjustment of operational logic injection pump the pH and conductivity value is under control in both higher and lower limit. It is shown that pH value are laid in 9.0-9.4. Moreover, the actual conductivity value are about 7.23 s /cm and 21.34 s /cm, respectively. It is match with ABB conductivity limit i.e. maximum 40 s /cm. Morover, water consumption decrease from 6413 m3/days to 45.1 m3/days