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Definition: Equipment fails, if it is no longer able to carry out its intended function under the specified operational conditions for which it is designed.

The formula for failure rate is: failure rate= 1/MTBF = R/T where R is the number of failures and T is total time. This tells us that the probability that any one particular device will survive to its calculated MTBF is only 36.8%. What does this calculation really mean?

The formula for failure rate is: failure rate= 1/MTBF = R/T where R is the number of failures and T is total time. This tells us that the probability that any one particular device will survive to its calculated MTBF is only 36.8%.

Reliability is the probability that a system performs correctly during a specific time duration. During this correct operation: No repair is required or performed. The system adequately follows the defined performance specifications.

Or Hazard Rate Hazard measures the conditional probability of a failure given the system is currently working. The Hazard/Instantaneous Failure Rate measures the dynamic (instantaneous) speed of failures.

Reliability is complementary to probability of failure, i.e. R(t) = 1 ?F(t) , orR(t) = 1 ??[1 ?Rj(t)] . For example, if two components are arranged in parallel, each with reliability R 1 = R 2 = 0.9, that is, F 1 = F 2 = 0.1, the resultant probability of failure is F = 0.1 × 0.1 = 0.01.

Failure rate can be defined as the anticipated number of times that an item fails in a specified period of time. It is a calculated value that provides a measure of reliability for a product.