What is Reliability?

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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