October 2007

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HP Reliability: Counting interventions instead of MTBF

Earlier this year, I had the opportunity to meet a very experienced machinery reliability professional at a refinery in the UK. Among his many tasks was tracking mean-time-between-failures (MTBFs) of..

Bloch, Heinz P., Hydrocarbon Processing Staff

Earlier this year, I had the opportunity to meet a very experienced machinery reliability professional at a refinery in the UK. Among his many tasks was tracking mean-time-between-failures (MTBFs) of centrifugal pumps. The refinery was divided into several sections or grouped process units. It was evident from the charts that some sections had better pump MTBFs than others. He was not too fond of MTBF tracking and offered an important reason: To achieve high MTBF, some unit managers used frequent interventions and thereby expended considerable money and resources for precautionary oil changes and the like. He offered the very valuable suggestion of tracking interventions of any kind. I ca

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