P-F Interval Made Simple

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This one page document was developed to educate maintenance and reliability professionals with a simple understanding of the P-F Interval. This documents follows my last document on "Why people do not understand the PF Curve".

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  • Harley, you are correct a Potential Failure could transition to full Functional Failure within a mini-second after P or could occur in a number of years. This issue would be if I identify P, now what? Well it depends on past data (Failure Rates, MTBF, etc). The other issue would be is the equipment maintained and operated within certain parameters, if not, good luck.
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  • I think Allied did a nice job years ago developing the P-F curve into a more visual model. The only thing I would take exception with is the definiation of 'Potential Failure.' The potenial failure may not be 'imminent' it could be 5 years or 5 seconds dependent on many factors.
    Ricky and GPAllied thank you for sharing so much great material on this site.
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  • This is a clear understandable training tool. Thanks for sharing
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  • Ricky, I really like the P-F Interval graphic, summary, and discussion that it creates. I shared your graphic in a P-F Interval discussion with our maintenance team yesterday regarding shifting to PdM and condition based maintenance strategies to improve reliability performance. Thanks for sharing!
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P-F Interval Made Simple

  1. 1. A DIVISION OF ALLIED RELIABILITY GROUP www.gpallied.com | GPAllied, LLC | Copyright 2013 THE P-F INTERVAL MADE SIMPLE As explained by: Ricky Smith, CMRP “A potential failure is an identifiable physical condition which indicates a functional failure is imminent” “A functional failure is the inability of an item (or the equipment containing it) to meet a specified performance standard” • A Potential Failure is when a defect is detected in a system and if not corrected will become a Total Functional Failure. P – Potential Failure F – Total Functional Failure • Predictive technologies are typically used to identify a Potential Failure. • The process typically used to correct a Potential Failure is Preventive Maintenance – restoration.

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