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  1 - Selecting preventive and maintenance strategy towards the to improve the assessment indexes of dependability and variability‘s criteria
  changiz Valmmohamadi Javad Sofiyabadi Fakhrodin Lotf Zadeh
  The main purpose of this study was to select a preventive and maintenance net strategy to improve the assessment indexes of dependability and variability in a company providing the gas and oil machinery and equipment for oil and gas production. The research method was a More

  The main purpose of this study was to select a preventive and maintenance net strategy to improve the assessment indexes of dependability and variability in a company providing the gas and oil machinery and equipment for oil and gas production. The research method was an applied and experimental one. To gather the data, the standard daily visit, the cause and effect analysis of using lathe damages of nine machine system during the two study phases were investigated. The research hypotheses, after confirming the normality of the data, were analyzed through mean hypothesis of one population, paired T- test, and between group correlation coefficient. In the first phase, the inclusive net strategy based on mean time for maintenance and net based on dependability were administered. In the second phase the combined net strategy was administered. In both phases the mean time indexes between failure and repair were assessed to see the effects of three compared strategies and the best net strategy was chosen. The results showed that the combined net strategy produced the improvement of the assessment indexes of dependability and variability and also increased the productivity of machinery and equipments.    Manuscript profile