Mean Time Between Failures (MTBF) — definition
Average operating time expected between one failure of a repairable system and the next, used as a reliability indicator for equipment and components.
MTBF is calculated from historical failure data or supplier reliability testing and is most meaningful when paired with mean time to repair (MTTR) to estimate overall equipment availability. It applies to repairable assets; for non-repairable components, mean time to failure is the equivalent measure.
Why it matters to industrial buyers
MTBF figures inform spare parts strategy, maintenance budgeting and the reliability assumptions used in total cost of ownership comparisons between competing equipment offers.
Key reference points
Related metric
MTTR (mean time to repair) combines with MTBF to estimate availability.
Data source
Often derived from field failure logs, supplier reliability tests or industry reliability databases.
Commonly confused with
Mean time to failure (MTTF)
MTTF applies to non-repairable items that are replaced rather than repaired after failure.
How it is used in practice
The technical specification requested MTBF data for the pelleting die to compare reliability across two competing machine suppliers.
Frequently asked questions
Is a higher MTBF always better?
Generally yes, but it should be weighed against purchase cost and repair time within a total cost of ownership analysis.
Can MTBF predict when a specific machine will fail?
No, it is a statistical average across a population of similar units, not a prediction for an individual machine.
Go deeper on the platform
Related terms
Preventive Maintenance (PM)
Planned maintenance programme performed at predetermined intervals or usage thresholds to reduce the probability of unplanned equipment failure.
Spare Parts Strategy
Planned approach to identifying, stocking and sourcing replacement components based on criticality, lead time and failure risk to limit unplanned downtime.
Total Cost of Ownership (TCO)
Sum of acquisition, operating, maintenance and disposal costs of an asset over its useful life, used to compare purchase options beyond initial price.
Technical Specification
Structured document describing the functional, performance, materials, and interface requirements an item of equipment or system must meet.
Pelleting Line
Processing sequence within a feed mill that compresses conditioned mash into dense pellets using a pellet press, followed by cooling, screening and, where required, coating.
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Reference content only. Global B2B Group is independent of equipment manufacturers and financing institutions; definitions are provided for education and do not constitute engineering, financial or legal advice.