Abstract
The condition based maintenance for pump system has been executed to enhance reliability and to optimize maintenance cost by introducing RCM (Reliability Centered Maintenance) as a part of the asset management of Sendai Sewage Works. Maintenance cycle of the equipment mostly depends on its bearing's lifecycle. Conditions of bearing parts of pumps are monitored under operation by vibration and acoustic emission measurement because the measured data provide information about maintenance criteria. Possibility of damaging on bearing parts can be suspected according to acoustic emission measurement. After measurement, individual inspection on bearing parts which are removed from shaft is carried out at overhaul. As a result, such failures on bearing parts as scratches and defects have become more apparent. Daily inspection with vibration measurement and trend monitoring by vibration and acoustic emission measurement are applied as strategic maintenance instead of existing time based maintenance to pump system.
