The P-F Curve

The P-F Curve or P-F interval seems like a simple concept, but it is often misunderstood.   The P-F Curve is often misunderstood because users take for granted that point "P" (the potential failure) has already been clearly defined. It is important then that before addressing the P-F interval, there is a clear definition of when and how to label a potential failure.

Below we see that the P-F Curve is a visual tool that allows us to understand how most equipment fails. A defect or abnormality begins on a part or component at point “P”, meaning failure begins, and total failure occurs at point “F”. The question is how can you detect a failure early enough to provide time to plan and schedule the necessary work without panic, reactivity, and a rise in the cost of repair?

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