May 2016

Columns

Reliability: Principles are more important than strategies

A number of US oil refineries have recently asked the question, “When should an equipment repair be classified as rework?”

Bloch, Heinz P., Hydrocarbon Processing Staff

A number of US oil refineries have recently asked the question, “When should an equipment repair be classified as rework?” At one major facility, if a pump or motor is taken to the shop for repairs and the asset is thereafter returned to service, a 45-day observation period commences. By that facility’s definition, a “good repair” is proven if, after recommissioning, an asset runs for at least 45 days without mechanical problems. If issues develop on Day 1 through Day 44, then the equipment is taken back to the shop, and the second repair is classified as rework. Since rework does not count as a failure, their statistics look good: Eight 44-day runs might equate to eight repair events, but

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