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“Determining the interval for on-condition inspection of an item subject to metal fatigue. Once the rate of decline in failure resistance has been determined, an inspection interval “AT” is established that provides ample opportunity to detect a potential [P] failure before a functional [F] failure can occur.” Excerpt From: F.S. Nowlan. “RELIABILITY-CENTERED MAINTENANCE.” 1979
Forty-two years later many of the benefits from Stanley Nowlan and Howard Heap’s Reliability-centered Maintenance are still setting the standard for achieving asset reliability.
Selecting the best condition monitoring technologies, approaches and periodicities based on failure mechanisms and failure modes is a basic building block of high reliability organizations. As solid as the original P to F curve is, it is only one part of a holistic approach to optimizing value from assets at all asset lifecycle phases.
Even as we typically work in silos, it is critical to understand the dynamic connections between Reliability Strategy Development and Asset Criticality and Risk Management and Decision Making and Asset Condition Management and Preventive Maintenance and Work Execution Management and Asset Knowledge and Asset Management across Asset Lifecycles and based in policy, strategy and plan to align energy toward creating value from assets in achievement of organizational objectives. That alignment and energy must be intentional.
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