In the equipment maintenance plans of many manufacturing companies, it is necessary to evaluate the performance of certain equipment with a relatively low failure frequency. It is complex to monitor its statistical behavior with the traditional engineering models, because most of the information, in a short time interval, the values are zero, that is to say, the failure count is zero in the equipment. This paper presents a case study in a compound fertilizer company, where the failures of a hydraulic pump are monitored over time, using a ZIP model with excess zeros. The results indicate a rethinking of maintenance plans, considering that there is a high measure of probability of failure, which is unacceptable in chemical processes.
The evaluation of performance with respect to the specifications in production processes is generally measured by means of univariate capacity indicators, but this is inadequate when there quality characteristics, adding that these characteristics have extreme values by their nature. It is suitable for this type of robust process indicators that use distances such as Canberra's that more accurately express the actual process conditions. The results obtained with the Canberra distance made the values given by the traditional indicators that used the Euclidean distance more flexible, showing that this new indicator is adjusted to processes with extreme values.
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