Probabilistic Approach to Rationalization of Plants Maintenance

Masao Kasai, Tetsuya Uchimoto, Hirotaka Sugiyama, Kenzo Miya, Junichi Notoya

Research output: Contribution to journalArticlepeer-review


Since there are a lot of equipments in large plants, their safety and reliability cannot be kept as high level as designed without maintenance activities. Then preventive maintenance is intensively executed in some large plants. However, it will be inefficient to perform the preventive maintenance blindly. To make maintenance activities effective, it is essential to identify the critical equipments influencing plant safety and/or reliability and carry out the maintenance by focusing attentions on these equipments. It needs quantitative analyses to identify the critical equipments based on the data of failure rates. However, complete data set of failure rates cannot necessarily be available for some plants such as nuclear power plants. In this study, we carry out the reliability analysis for generic LNG plant and calculate various quantitative risk importance measures for each equipment. We propose rather qualitative representations for some quantitative measures, considering the situation without complete data set and conclude that it is possible to rationalize maintenance procedure by using these rather qualitative measures, though the level of rationalization is of course limited.

Original languageEnglish
Pages (from-to)2381-2386
Number of pages6
JournalNihon Kikai Gakkai Ronbunshu, C Hen/Transactions of the Japan Society of Mechanical Engineers, Part C
Issue number659
Publication statusPublished - 2001


  • Birn Baum
  • Fussel-Vesely
  • Importance Measure
  • Minimal Cut Set
  • Rationalization of Maintenance
  • Reliability
  • Risk Achievement Worth
  • Safety


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