Do you believe the numbers?
Tuesday, October 25, 2011Viewed 1455 times
In a couple of recent projects and discussions, I have come across something extremely concerning. Engineers are very good at performing accurate calculations, and the PFDavg and PFH computations for SIL performance verification are improving in precision all the time. Unfortunately, there is often such a focus on the details of the calculation that some critical big-picture items go missing. Although it is important to properly estimate the effects of partial proof test coverage, redundant architectures and high diagnostic coverage on the PFDavg and PFH to get a precise result, we miss the basic question: “Should we believe the numbers?”
The first thought is, why shouldn’t we? There is now a wide range of reliable failure rate data for all…
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