All my books are written in series since they are connected and based on the 12 Disciplines of Maintenance, just like my previous posts. Here again, is an extract from the current book I’m writing on Maintenance Indices – Meaningful Measures of Equipment Performance.

Many believe that an OEE of 85% and beyond is already considered world-class. My experience is that this may or may not always be true and correct. I know that OEE is not about achieving 85% or more but satisfying the three components: availability, performance efficiency, and quality rate. Let me cite you a case.

OEE = {(Avail) 0.98 x (Effic)0.97 x (Quality) 0.90] x 100%
OEE = 85.5%

This means that for every 1,000,000 products produced, 100,000 are rejected, so there is no reason for the plant to celebrate.

Second, OEE is just a measure of the equipment’s primary function, which means that every piece of equipment has more than one function, and there are cases where a failure of a secondary function can be more dangerous than the failure of the primary function. For example, suppose your equipment is suffering from an oil leak, sensors that are no longer functioning, or protective devices in a failed state where the equipment is still capable of delivering the products. In that case, OEE can still be high, but the equipment is actually at risk and just waiting for its untimely moment to fail. In layman’s terms, your car may satisfy the primary function of travelling from point A to Point B, but your brake lights are not functioning, so is your wiper, signal light and so on.

LinkedIn post by Rolly Angeles

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