exida explains Blog

Entries tagged with: FMEDA

  • by John Yozallinas, CFSE
  • Tuesday, December 17, 2013
  • Certification

12 Days of Christmas: Safety Edition

What’s on your Christmas list?  Instead of relying on Santa, here are some gifts you can expect from a SIL 3 compliant process:

Conceptual Design and SIL Verification’s Ultimate Resource

Conceptual Design and SIL Verification’s Ultimate Resource

Cycle Testing for Static Applications? NO!

Cycle Testing for Static Applications? NO!

The failure rates of certain mechanical components used in solenoid valves, actuators, and valves vary substantially depending on operation. Seals such as O-rings, for example have fundamentally different failure modes when used in applications with frequent movement (dynamic) versus applications with infrequent movement (static). 

Static is generally…

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Dare to Be Different

Dare to Be Different

  • by schweitzer engineering laboratories
  • Wednesday, July 07, 2010
  • Logic Solvers

DEHN + SÖHNE GmbH + Co. KG

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  • by schweitzer engineering laboratories
  • Wednesday, July 07, 2010
  • Logic Solvers

DEHN + SÖHNE GmbH + Co. KG

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  • by schweitzer engineering laboratories
  • Wednesday, July 07, 2010
  • Logic Solvers

DEHN + SÖHNE GmbH + Co. KG

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  • by schweitzer engineering laboratories
  • Wednesday, July 07, 2010
  • Logic Solvers

DEHN + SÖHNE GmbH + Co. KG

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  • by schweitzer engineering laboratories
  • Wednesday, July 07, 2010
  • Logic Solvers

Endress+Hauser

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Field Data Validation with Predictive Analytics

Who cares about field failure data? Why are we even here?

IEC 61511 – Fundamental Concepts

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…

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FMEDA Predictions
  • by Loren Stewart, CFSE
  • Thursday, September 01, 2016
  • Certification

FMEDA Predictions

The FMEDA technique is performed on a specific device (e.g., ball valve, pressure transmitter, temperature sensor, electronic module, etc.) specified down to the manufacturer and series/model. Based on the specifics of the design, the parts used to execute the design, the design margins, any automatic diagnostics, the…

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Getting Realistic Failure Rate Data - Part 4

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…

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Getting Realistic Failure Rate Data - Part 5

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…

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  • by Dr. William Goble, CFSE
  • Tuesday, August 04, 2015
  • Certification

Getting Realistic Failure Rate Data - Part 6

Over the course of several blogs , I talked 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 takes…

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Hans Turck GmbH

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How to Calculate Proof Test Coverage
  • by Dr. William Goble, CFSE
  • Thursday, October 16, 2014
  • Certification

How to Calculate Proof Test Coverage

Most engineers who design and verify safety instrumented functions (SIFs) understand how hard it is to design a manual proof test with high effectiveness (also called high proof test coverage). Those folks who understand that a proof test is not likely to detect all failures never use simplified equations…

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Most Failures are Systematic - NOT!
  • by Dr. William Goble, CFSE
  • Wednesday, April 16, 2014
  • Certification

Most Failures are Systematic - NOT!

We have studied hundreds of sets of field failure data from various sources here at exida.  Some of these data sets have indicated differences in failure rates by over an order of magnitude for the same product type.  After tracing through the data collection process for many of…

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Pepperl+Fuchs

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Pepperl+Fuchs

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Pepperl+Fuchs

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