Failure Modes, Effects and Diagnostic Analysis FMEDA

Appendix E FAILURE MODES EFFECTS AND DIAGNOSTIC ANALYSIS (FMEDA) 303... 

A hardware analysis called a Failure Modes Effects and Diagnostics Analysis (FMEDA) can be done to determine the failure rates and failure modes of an instrument (Ref. 4). This is done to provide the safety design engineer with the data needed to more accurately perform probabilistic analysis. 

Fortunately, several instrumentation manufacturers are providing detailed analysis of their products to determine a more accurate set of numbers useful for safety verification purposes. A Failure Modes Effects and Diagnostic Analysis (FMEDA) will provide specific failure rates for each failure mode of an instrumentation product. The percentage of failures that are safe versus dangerous is clear and relatively precise for each specific product. The diagnostic ability of the instrument is precisely measured. Overall, the numbers from such an analysis are indeed product specific and provide a much higher level of accuracy when compared to industry database numbers and experience based estimates. 

Failure Modes Effects and Diagnostics Analysis (FMEDA)... 

Manufacturing controls to ensure to the desired safety requirements Control of management of change (MOC) to meet the requirements Failure modes, effects and diagnostic analysis (FMEDA) to determine SFF, PHF Details of proof test requirements... 

FMEDA stands for Failure Modes, Effects and Diagnostic Analysis. It is an extension of FMEA Technique by reviewing if the failure mode(s) are detectable and calculating the associated frequencies. 

FMEDA Failure Modes, Effects and Diagnostic Coverage Analysis... 

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