January 2014

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HP Reliability: Was that a failure or ‘just a repair’?

Purists among reliability professionals are sometimes concerned about the accuracy of the measurement of the mean-time-between-failure (MTBF) of an asset. There are many ways to conduct this failure f..

Bloch, H. P., Hydrocarbon Processing Staff

Purists among reliability professionals are sometimes concerned about the accuracy of the measurement of the mean-time-between-failure (MTBF) of an asset. There are many ways to conduct this failure frequency rate assessment. Fig. 1 represents a multi-site major refining company. This figure demonstrates that the corporate reliability engineers are making reasonably accurate affiliate-to-affiliate comparisons. However, some petrochemical and refining companies make a distinction between repairs and failures. As one engineer wrote, “I have a philosophical question around the classification of repairs vs. failures when tracking rotating equipment reliability. As I see it, there are basi

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