Just to create some discussion, I was looking at slide recently that showed a P-F curve and in my mind it mislabeled both point P and point F.  The slide stated that point P was where the failure occurred, and point F is the point in time when the component fails.  My understanding from researching a few documents including Nowlan and Heap is that point P represents Potential Failure and is the point at which the failure is first detected using a specific task, and point F is Functional Failure, the point where the item can no longer deliver its intended function.

At any rate, I am interested in hearing what you have to say on this topic including if this makes any difference at all?

3 Responses to The P-F Curve, some confusion about what each point represents?

  1. I would say that this is not a important difference and might even be contributed to someone’s misunderstanding of language terms. Was the slide you where reviewing written by someone with English as a second language? I know these kind of misinterpretations sometimes happen to me when writing in a different language then my native language.

    • DPlucky says:

      Bjarni – The slide is one I have seen in several places and was published by a company here in the US. The importance of understanding that point P is where the failure is first detected comes into play with two essential elements of maintenance. The first being condition based maintenance if we don’t use the technologies available to detect potential failures then of course functional failure occur. The second is to stress the importance of precision maintenance techniques at the time of installation to eliminate potential failures.

  2. Asim says:

    From Understanding the P-F curve, The functional failure is the failure of equipment totally or partially to perform to intended standard (it can be measured). While potential failure inform us that the functional failure is about to take place. Then the P supposed to be before F in the curve.

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