Category: Reliability Analysis
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RA requires LRCM
The idea behind EXAKT is an appealing one. What can be more desirable than a systematic way to determine the “exact” relationship between condition monitoring data and impending failure? Although I wish that I could say that EXAKT auto-magically generates predictive models, I cannot. EXAKT translates the occurrences of PFs, FFs, and Ss of failure…
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LRCM and the Failure Finding Interval
Safety devices represent one of the most important issues requiring serious attention by maintenance personnel. As a rule, when they fail, they fail silently and invisibly, with potentially disastrous results. Hence, the question facing reliability engineers is “How often should the safety device be tested for functionality?” That is, what is the “Failure Finding Interval”…
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Interpreting failure data
Here is an excerpt from the famous Nowlen & Heap RCM report of 1978. It describes some basic difficulties in the analysis of reliability related data. The problem of interpreting failure data is further complicated by differences in reporting policy from one organization to another. For example, one airline might classify an engine removed because…
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FMEA according to Wikipedia
FMEA stands for “Failure Modes and Effects Analysis”. It begins with a thorough functional analysis. FMEA is the core process of RCM. However, the FMEA article in Wikipedia is misleading. It uses outdated terminology that renders the subject of FMEA vague, confusing, and even mystical. FMEA depends on clarity. Maintenance depends on clear and simple terms…
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Criticality analysis in RCM
Criticality Analysis may be applied at two levels of the RCM process. First, it may be used to sort or classify a large number of equipment assets as to their priority for analysis. Secondly criticality analysis may be applied to individual failure modes as in the FMECA process. Criticality analysis when performed on failure modes…