Category: P-F Interval
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P-F Interval a red herring?
The article describing EXAKT CBM optimization, “The Elusive P-F Interval“, may leave one with the impression that the P-F Interval is an irrelevant concept. The P-F Interval is a useful concept in certain simple cases. Nevertheless, it does detract from an issue of greater concern to the designer of a CBM program. Namely, the reliable detection…
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PF interval from the failure rate
How can the PF interval be determined from the failure rate? You can’t know the PF interval directly from the failure rate. The PF interval is unrelated mathematically to the failure rate. It is the lead time between the ability to detect a failure process and the actual loss of function. The PF interval can…
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Inspections – CBM and others
An inspection is like the skin of an onion. As you peel back each layer you will spend more money and time, but in return, you will get more information. For example: oil analysis – least expensive, least intrusive, no downtime – some information diesel trap – more cost, more intrusive, some downtime…
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Confidence in predictive maintenance
Without a mechanism to evaluate a Condition Based Maintenance (CBM) program’s evolving performance CBM activities will degenerate to “busy work”. Data will continue to be collected, manipulated and filed as a matter of routine. To counter this tendency towards apathy, managers should periodically justify, in terms of profitability and safety, the resources allocated to CBM.…