Most end users I teach in our FSE100 class are not really aware of or fully, understand when we talk about failure rates. For example, what’s a FIT mean? For those end users more versed in this, they understand what is meant by a FIT. Essentially a device can have…
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Entries tagged with: Failure Rates
- by Dr. William Goble, CFSE
- Thursday, September 19, 2019
- Functional Safety
My Final Element Field Failure Data says 150 FITS and OREDA is 2000 FITS
I got an email saying that the exida's www.SILSafeData.com minimum failure rates were way too high. The email went on to say that his REAL field failure data showed a result of 150 FITS for a remote actuated valve assembly. The lowest SILSafeData limits for clean service, Class IV leakage,…
- by Dr. William Goble, CFSE
- Tuesday, January 27, 2015
- Functional Safety
The exida FMEDA Process - Accurate Failure Data for the Process Industries
In this blog, I will talk about the FMEDA method and how it can generate realistically accurate failure rate data.
The first question we have to ask is “why do you need failure rate data ?”
One of the fundamental concepts in today’s functional safety standard, IEC 61508 and…
- by Steve Gandy, CFSP
- Tuesday, November 26, 2019
- Functional Safety
The Site Safety Challenge – Do You Follow Good Site Practices?
The question of whether companies follow good site safety practices is an interesting one. Firstly, what do we mean by good site safety practices? I think most companies believe they follow good site safety practices but do they really? Are they really measuring and tracking this?
The basis of having good site…
- by Julia V. Bukowski
- Thursday, September 15, 2022
- Functional Safety
To Be Meaningful & Useful Failure Rates Must Be Validated
Engineers and managers who work with safety equipment have likely seen a failure rate of some kind quoted for the equipment. Some equipment even comes with a safety certification stating the failure rate given certain assumptions about how the equipment will be used.
The numbers sometimes turn out to be…
- by Dr. William Goble, CFSE
- Thursday, January 24, 2019
- Certification
Who gives exida the authority to publish SILSafeData?
SILSafeData contains upper and lower bound ranges of dangerous undetected failure rates for many automation devices. It was created by exida using statistical analysis of FMEDA failure rate predictions. The component database used in the FMEDAx tool is based on…
- by Dr. William Goble, CFSE
- Monday, June 24, 2024
- Certification
Why do we do probabilistic models to predict risk reduction? Check the box only?
I had an engineer from a European Certification Body ask me why exida would bother paying any attention to these failure rate numbers, especially on mechanical devices? He said that he does not know anyone who actually uses them! To answer why exida pays attention to failure rates, we…