Maintworld Magazine 4/2020

PARTNER ARTICLE
Criticality does not affect the
FDP, but it might be a factor
when we assign inspection
frequency.
The criticality of the motor is a deciding
factor when estimating the financial
aspects of a break down and the precautions
taken. But, the criticality in itself
will not help you decide the inspection
frequency. For example, let’s say you
have a simple criticality ranking of
equipment of 1-10 and one equipment
has the criticality 5, what is the inspection
frequency? A day, a month, every
shift? There is no logical connection
between inspection frequency and criticality.
But, shouldn’t we inspect critical
equipment more often? Perhaps, but
again, you can’t find the time interval by
knowing the criticality. First, figure out
the FDP, then if the equipment is critical,
go conservative, if it’s not critical, be
liberal. Think of criticality analysis as
add-on “insurance” to the FDP.
To sum up this article:
• Inspection frequencies are based
on FDP, not criticality or component
life.
• The FDP for all failure modes is
quite unfeasible and impractical to
predict. However, we can make a
pretty good guess to what it is.
• • If you don’t have very good
historical data as to what the FDP
is, don’t waste your time making an
elaborate study, make a reasonable
guess, it is what you will end up with
anyway with a study without reliable
data.
• If you have the FDP data, ask if it is
better to spend the effort in training
people in how to do inspections and
planning and scheduling of corrective
actions instead of making an
outsized study. It is much more cost
effective to spend the time on making
the execution of good inspections
a reality.
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