Reliability may be defined as the probability of the product to perform as expected for a certain period of time, under the given operating conditions, and at a given set of product performance characteristics.
One important consideration when performing reliability studies is the safety of the product or the process. The criticality of a product or process changes drastically when human safety considerations are involved. Reliability test and studies can form the basis for safety studies.
It is the engineer’s task to define all of the previously –stated items, and in many instances, the engineer has only past experience and personal knowledge of like systems to define these different aspects of failure accurately.
The probability of survival of this type of product using an exponential distribution may be expresses as
Rt = e = e
Where Rt = the reliability or probability of survival
t = the time specified for operation without failure
l = the failure rate
q the mean time to failure
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