January 1999

Special Report: Maintenance and Retrofitting

Use equipment failure statistics properly

These data can help in deciding which reliability improvement efforts are feasible and reasonable

Bloch, Heinz P., Hydrocarbon Processing Staff; Geitner, F. K., Consultant

Performance improvements are always measured against your or someone else's prior performance. In the context of equipment reliability, terms such as mean-time-between-failure (MTBF), mean-time-to-repair (MTTR), availability and reliability are used as benchmarks. While the definitions of MTBF and MTBR are perhaps intuitively evident, much discussion and even controversy have enmeshed the two other terms. We take the view that availability is basically either: Uptime, divided by uptime plus downtime Subtracting from calendar time the equipment-related shutdown time, and dividing the result by calendar time. Similarly, reliability would be expressed as either: The duration or pro

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