What is MTBF and Why You Shouldn’t Use It
Mean Time Between Failure or MTBF is almost universally recognized in maintenance, reliability, and asset management.
Why is that? And does it actually help an organization improve the reliability of their assets?
The answer is a resounding No.
So why is used so extensively? Is it because it can be calculated easily, or because of a fundamental misunderstanding?
Fred Schenkelberg has made it a personal mission to debunk the myths around MTBF. Fred shares his views on MTBF, why organizations need to stop using it immediately, and what should be used instead.
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- Reliability = R(t) = e–lt
- R(t) = Reliability estimate for a period of time, cycles, miles, etc. (t).
- e = Base of the natural logarithms (2.718281828)
- λ = Failure rate (1/MTBF, or 1/MTTF)
- Availability = A = Uptime / Operating Cycle
- Uptime = Time equipment ran as expected
- Operating Cycle = Time equipment was planned to run
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