Discussion on the equipment downtime rate due to failures
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The failure downtime rate is the ratio of the time the equipment is down due to failures to the sum of the time the equipment is actually in operation and the time it is down due to failures (Failure Downtime Rate = Time down due to failures / (Time actually in operation + Time down due to failures)). 1. Does the denominator in the equipment failure downtime rate (planned operating time of the equipment) include the time during which the equipment is idle? If the machine doesn’t start because there are no production tasks, isn’t that not counted as part of the planned time? 2. Should the time required for external repair of equipment failures, as well as the time needed to purchase spare parts, be included in the numerator (the total time due to equipment failures)?
1. The denominator in the equipment downtime rate (actual operating time of the equipment + downtime due to failures) includes only the time when the equipment is actually in operation and the time it is down due to failures. The time spent idling due to shutdowns is not included in the planned time, nor is it taken into account in the denominator. 2. The time required for external repair of equipment failures and the time needed to purchase spare parts should be included in the numerator (the time during which the equipment is shut down), as these times are also among the reasons that cause the equipment to stop operating. Therefore, the equipment downtime rate can be expressed as: Downtime rate = Time spent due to failures / (Actual operating time of the equipment + Time spent due to failures + Time spent on external repairs + Time spent on purchasing spare parts). .