Reliability is the likelihood of a equipment or system operating safely (failure-free) under specific operating conditions for a certain period of time. To ensure the reliability of a system or facility, a series of maintenance strategies are prepared and implemented. Reliability is measured in mean time between failures (MTBF) in years, or in the reliability function, R(t), as a percentage (%).
Maintainability is the probability that a equipment or system can be restored to its original function by someone or a team with specific qualifications. Maintainability is measured in mean time to repair (MTTR) in years, or through the function M(t) as a percentage (%).
Reliability, along with maintainability, will have an impact on the availability of facility operations. Availability is the ability of a facility to function as needed, measured in percentage (%) per year.
