June 2011
Intermediate to advanced
279 pages
8h 59m
English
Content preview from Root Cause Analysis, 4th Edition
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6 Root Cause Analysis: Improving Performance for Bottom-Line Results
of a highly reliable asset. But if we use the Reliability calculation that follows we
would get a much different picture. Equation 1.3 is a Sample Reliability calculation.
Reliability = e
–λt
Natural logarithmic base: e = 2.718
Failure rate: λ = 1/MTBF = 1/91
Mission time: t = 365 (days)
___________________________
(1.3)
Reliability = e
–λt
= 2.718
–λt
= 2.718 – 1/91 (365)
= 2.718
–4.0109
= 1.81%
The fact is, an asset that fails four times per year is extremely unreliable and the
likelihood of that asset reaching a mission time of 1 year is highly unlikely, even
though its availability is very good.
These are only a few common KPIs. As you can imagine, there is an array of ...
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