Who cares about field failure data? Why are we even here?
The fundamental concepts from our functional safety standards are the probabilistic performance based design. Many of you know that this was terribly controversial when this was first proposed. Even to this day, there…
Over the course of several blogs , I will talk about getting realistic failure rate data, where this failure data comes from, and how different methods of failure data analysis compare. I think if you understand this, you will begin to get a very good feel of what it…
Over the course of several blogs , I will talk about getting realistic failure rate data, where this failure data comes from, and how different methods of failure data analysis compare. I think if you understand this, you will begin to get a very good feel of what it…
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,…
A question was posed to me this week about why the OREDA failure rate for a solenoid valve was greater than the Failure Modes, Effects, and Diagnostic Analysis (FMEDA) results from exida for a specific manufacturer’s solenoid valve. The person asking the question was clearly challenging the exida…
Most of you know that exida gathers field failure data from many sources including manufacturers’ warranty return data and end user maintenance/failure records. At this point we have nearly 100 billion unit operating hours of data. This is probably the largest process industry data set in the world. And…
Reliability engineers have known for decades that realistic data must ultimately come from one source, quality field failure data for devices operating in a similar application.
Perhaps that is why IEC 61511:2016, Clause 11.9.3 states
“The reliability data used when quantifying the effect of random failures shall…
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…