Category: Theory and definitions
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FAQ
Q: What does LivingReliability (LR) Sell? Software?Utility services, consultancy services? Any improvement they are aiming for? A: LR sells a methodology developed to achieve verifiable reliability from maintenance related data. Software and consulting make up the offering. Q: Who is LR? Corporate Profile?(3-4 liner only) A: LR is a company incorporated in Canada and in…
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Failure analysis for reliability analysis
The dismantling of an Engine can occur for one of several reasons, for example, as a result of failure, symptoms of impending failure, or because the unit has reached its predetermined age of overhaul. For whatever reason an overhaul represents a golden opportunity to enhance the performance of predictive maintenance. The observations made during rebuild are indispensable for…
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Real meaning of the six RCM curves
You may be wondering about the famous “RCM curves” shown below in Figure 1. They are the Age-Reliability behavior curves which graph the Conditional Probability of failure against age. A common question is the following. “For the 139 items covered in the Nowlan & Heap (UAL) study, for example, do these curves represent the real…
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Conditional probability of failure vs. hazard rate
This slide presentation describes the basics of the age reliability relationship. It clarifies the difference between the Failure Rate function and the Conditional Probability of Failure. An amusing story about confusing Failure Rate and Conditional Failure Probability is told in this post. John Moubray, as a warning against being too sure of oneself, used to…