Abstract
After the long-term operation of reservoir facilities, they will become nonoperational due to the material deterioration and the performance degradation. One of crucial decisions is to determine the maintenance or replacement of the facilities in a cost-effective manner. Conventional replacement models seldom consider the maintenance effect. The facilities after maintenance are generally not as good as new, but are relatively restored. The target of this study is to establish a replacement decision model of the reservoir facilities under imperfect maintenance. By combining the theories of reliability analysis, imperfect maintenance, and engineering economics, the best timing of replacement that achieves cost-effectiveness is analyzed and proposed. Lastly, based on the design of experiments (DOE) and simulation, the regression curve chart for the economical replacement decision is established. Once the failure rate, the age of recovery after maintenance, and the ratio of maintenance cost to replacement cost are estimated based on historical data, the cost-effective replacement time of hydraulic machinery facilities will be efficiently determined.
Highlights
A reservoir is a comprehensive and complex civil facility, which is composed of a structural dam and the hydraulic machinery facilities
This study will adopt the concepts of the replacement studies stated above, combined with the theories of reliability analysis, imperfect maintenance, and engineering economics, to develop a replacement decision model for the reservoir facilities under imperfect maintenance
How to make a cost-effective replacement and renewal decision for the reservoir facilities under imperfect maintenance is the focus of this study
Summary
A reservoir is a comprehensive and complex civil facility, which is composed of a structural dam and the hydraulic machinery facilities. The hydraulic machinery facilities are an important control system and contain the driving mechanism, valve body, hydraulic equipment, sluice gate, hoisting wire rope, water gate rack lift, trash remover, emergency generator, and so on. They must be regularly inspected and maintained to ensure continuous and safe operation during the lifetime of the dam. The reservoir facilities are under the process of continuous preventive maintenance and failure repair Their performance will generally decline faster, and the maintenance costs will increase over time. This study will adopt the concepts of the replacement studies stated above, combined with the theories of reliability analysis, imperfect maintenance, and engineering economics, to develop a replacement decision model for the reservoir facilities under imperfect maintenance
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