Plant maintenanace method and apparatus

摘要

Entered in a plant-maintenance apparatus are data on inspection, diagnosis, repair and operation histories for equipment that constitute a plant to be maintained. Failure-event tree breakdown is performed on failures to be expected for the equipment. Predicted is unreliability of at least one starting item in the failure-event tree breakdown. Unreliability of each item in the failure-event tree is calculated based on failure unreliability function. Unreliability and a cost of recovery from each failure event in the failure-event tree are multiplied and results of the multiplication are accumulated in accordance with the tree breakdown, thus obtaining a recovery cost. Preventive maintenance expenses are calculated for preventing failure events. Maintenance timing and technique are decided through comparison between the recovery cost and the preventive maintenance expenses. Instead of the failure-event tree breakdown, efficiency and operational-function decay event-tree breakdown may be performed on efficiency and operational-function decay factors to be expected for the equipment. Predicted in this case is unreliability of at least one starting item in the efficiency and operational-function decay event-tree breakdown. Unreliability of each item in the efficiency and operational-function decay-event tree breakdown is calculated based on failure unreliability function. Further calculated is efficiency and operational-function decay to be expected from the calculation based on the failure unreliability function. Unreliability and monetary loss due to efficiency and operational-function decay and a cost of recovery from the decay are multiplied and results of the multiplication are accumulated in accordance with the efficiency and operational-function decay-event tree breakdown. Preventive maintenance expenses are calculated for preventing the efficiency and operational-function decay.