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Improvment of Plant Availabilty Through Failure Prioritization Approach

Arasteh khouy, Iman; Shafigh, Farhang | 2008

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  1. Type of Document: M.Sc. Thesis
  2. Language: English
  3. Document No: 39271 (01)
  4. University: Sharif University of Technology; Lulea University of Technology
  5. Department: Industrial Engineering
  6. Advisor(s): Ghodrati, Behzad
  7. Abstract:
  8. In order to survive in the competitive market, companies should increase the availability of plants. In order to increase the availability of a system, the occurrence of failures should be decreased. It is not possible to eliminate all of failures simultaneously. It means, it is not cost effective and logical to concentrate on elimination of all failures. In Addition, the cause of some failures might not be eliminated. So, the occurrence of those failures should be postponed to the later time as much as possible. Therefore, the critical failure modes should be identified to be concentrated for further analysis. Ultimately; the root causes of these failures should be explored and if it is possible, eliminate the future occurrence of them to increase the system’s availability. One specific failure can be evaluated through different criteria. Based on the plant objectives generally and maintenance objectives particularly, different criteria are defined such as downtime, frequency of failure, cost of spare pats and etc. Each failure can be critical in one or some specific criteria. For instance, one failure may have a large downtime, while other failure happens frequently and the other failure needs a great expense to prepare spare parts each time that happened. Each of these criteria has a distinctive value in each failure. Moreover, each failure can be categorized through different failure categories such as Mechanical, Electrical and etc. But how should the most critical failures is specified considering different criteria and failure categories simultaneously? The purpose of this thesis is to propose a model which can prioritize between different criteria and failure categories and combine them rationally in order to identify the most critical failures. Thereafter; the root causes of these failures should be explored and eliminated if it is possible. To test the validity of the model, the data collection and classification was carried out from one wood panel producer in Iran and then the case study concerning the proposed model was performed. After application of the proposed model and evaluation of the case study’s results, it was apparent that this model can be helpful to identify and choose most critical failure modes. Besides, implementation of the proper root cause failure analysis method can lead us to the most probable contributed reason in the occurrence of failure. By eliminating the root cause of failure not only it is possible to reduce the number of failures but also will the availability of the system be increased
  9. Keywords:
  10. Analytical Hierarchy Process (AHP) ; Failure Analysis ; Prioritization ; Invariance ; Maintenance ; Critical Failure Mode

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