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Availability of Equipment Formula

The availability of machinery in the context of manufacturing industry is one of the three main factors in the calculation of OEE (overall equipment efficiency). It takes into account all events that could have interrupted the expected production time if it had been stopped for a longer period. World-class availability is rated at 90% or more. Preventive maintenance affects availability by helping to reduce breakdowns and remove equipment from production for routine maintenance. Determining which PMs to run more or less frequently will make your operations more efficient and maximize availability. Start by looking at failure rates to optimize particle intervals. If an asset frequently fails despite regular PMs, there may be other reasons for failure. Next, look at the historical error codes to see if you can avoid outages by introducing a new PM. If failure rates are low, check the PM frequency for this asset. Inherent availability is stationary availability when only system downtime for corrective maintenance (CM) is taken into account. This classification is sometimes referred to as availability, as seen by maintenance personnel. This classification excludes preventive maintenance failures, logistical delays, delivery delays and administrative delays. Because these other causes of delay can be minimized or eliminated, an availability value that only takes into account corrective downtime is the inherent or intrinsic property of the system.

Often, this is the type of availability that companies use to determine the availability of their products (e.B. computer servers) because they consider that downtime that does not affect actual repair time is out of their control and too unpredictable. The classification of availability is somewhat flexible and is largely based on the types of downtime used in the calculation and the relationship to time (i.e., the duration to which availability refers). As a result, there are a number of different classifications of availability, including: Improving the availability of the entire plant must be carried out systematically, involving both senior management and employees of the organization. Promoting a culture to reduce defects and downtime can affect plant availability and even overall plant efficiency. As you can see in the figure above, availability decreases during PM. As an example of instantaneous availability calculations, instantaneous availability is 0.9627 per t = 500, 0.6400 per t = 1,000, and 0.9703 per t = 2,500. The results can be read directly from the chart or retrieved with the Quick Calculation Pad (QCP).

It is a very nice document to understand the availability and reliability of the machine. The following figure graphically illustrates stationary availability. Downtime has the biggest impact on availability and this is something that maintenance has a lot of control over. Downtime can be divided into scheduled vs. unplanned and frequency vs. length. Each component can be disassembled until an anomaly is identified. Once issues are localized, they can be resolved and improve availability.

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