Reliability is
the probability that a plant or component will not fail to
perform within specified limits in a given time while working in
a stated environment. For the case of mechanical systems the
following definition can be used to define reliability
Mechanical Reliability is the probability that a
spare, item, or unit will perform its prescribed duty without
failure for a given time when operated correctly in a specified
environment.
The definition of reliability includes a number
of variables that are external to the artefact being analysed.
Identical equipments may have very different duty requirements
such as frequent stop-starts or continuous running. Environmental
conditions such as fine dust can also effect a machine. It is
thus necessary to understand completely the operating conditions
under which an artefact is expected to operate.
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