Efficient Plant October 2021 - 22

Answers to questions
department | on the floor
facing today's reliability
& maintenance
professionals
Reliability
Raises
Customer
Expectations
Dr. Klaus M. Blache
Univ. of Tennessee Reliability
and Maintainability Center
(RMC)
Q
A
What does
reliability mean?
The ASQ (American Society for
It depends on who you ask
and where you look. In Merriam-Webster,
it's defined as
1. the quality or state of being reliable
2. the extent to which an experiment,
test, or measuring procedure yields the
same results on repeated trials.
I was taught that you shouldn't define
a word by using the same word in the
defining sentence, but that's a discussion
for another day.
In psychological research, reliability
refers to the consistency of a research
study, survey, or repeatability of a measurement-related
test. In any quantitative
research you're looking for a consistent
measure of something. Your measurement
choice should produce similar
(reliable) results, even if conducted by
different individuals at different times.
Quality, Milwaukee, asq.org) defines
reliability as the probability that a product,
system, or service will adequately
perform its intended function for a specified
period or will operate in a defined
environment without failure. It can be
observed as probability of success, durability,
dependability, quality over time,
and availability to perform a function.
SMRP (Society for Maintenance &
Reliability Professionals, Atlanta, smrp.
org) defines reliability analysis as a
technique (with predictive tools) used
to estimate the life of an asset (product).
It's usually expressed in terms of hours
as mean time between failures (MTBF).
Reliability analysis of systems/assets
ensures delivery of good products or
services. Analysis helps to identify and
to avoid some catastrophic events due to
failure of component(s).
A commonly used textbook, (Practical
Reliability Engineering-5th edition,
P. O'Conner and A. Kleyner, Wiley
publication, 2012), states:
" The objectives of reliability engineering,
in decreasing order of priority,
are:
1. To apply engineering knowledge and
specialist techniques to prevent or reduce
the likelihood or frequency of failures.
2. To identify and correct the causes of
failures that do occur, despite the efforts
to prevent them.
3. To determine ways of coping with
failures that do occur if their causes
Improved reliability has raised the bar for
asset performance, what you produce, transportation
dependability, and product quality.
22 | EFFICIENTPLANTMAG.COM
OCTOBER 2021

Efficient Plant October 2021

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