SCHEDULING MAINTENANCE PROPOSAL FOR TURBINE MACHINES USING THE AGE REPLACEMENT METHOD ATBALAMBANO HYDROELECTRIC POWER PLANTPT. Vale Indonesia Tbk.

Abstract

PT. Vale Indonesia Tbk. is a company engaged in the mining industry, particularly
in nickel processing (Ni). The company operates a power plant at Balambano
Hydroelectric Power Plant (2x68.5 MW). The company's usual maintenance
practice is limited to corrective maintenance, which involves replacing or repairing
components only when they are damaged. The aim of this research is to determine
the optimal replacement time for preventive maintenance on turbine machines in
order to minimize downtime. The age replacement method is used to calculate the
replacement interval for components based on their usage life. The research
findings show that the mean time to failure (MTTF) of the wicket gate is 2217.824
hours or 92.41 days, which means that the component may experience failure again
after operating for that MTTF duration. Therefore, the recommendation is to replace
the component every 85 days of operation and perform inspections every 15 days.