4.1.1.
Availability
The availability is calculated as the required availability minus the downtime and then divided by the required availability. This can be written in the form of formula as
Availability = ((Required availability – Downtime)/ Required availability)* 100 (2)
The required availability can be defined as the time of production to operate the equipment minus the other planned downtime like breaks, meetings etc. The down time can be defined as the actual time for which the equipment is down for repairs or changeovers. This time is also some times known as the breakdown time. The output of this formula gives the true availability of the equipment. This value is used also in the overall equipment effectiveness formula to measure the effectiveness of the equipment.