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exida explains Blog

Entries tagged with: Pfd

  • by Iwan van Beurden, CFSE
  • Wednesday, March 20, 2013
  • Software

Changing the PVST Interval. Hey, my failure rates changed!

I’ve been receiving several inquiries lately regarding the impact of the Partial Valve Stroke Test (PVST) interval on the failure rates of a final element. Specifically asking how does exSILentia® deal with this? exSILentia® allows users to specify if partial stroke testing is performed on their final…

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The Battle of the Failure Rates

Site Specific vs. Product Specific

During a field failure analysis study, it was discovered that the calculated failure rate of a specific device varied by more than 4X depending on installation site.  Particularly, it was one specific site with a high failure rate.  While any reliability engineer…

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exida explains

The exida explains blog has been around for over five years and gives expert and sometimes candid insight into the world functional safety, alarm management, and industrial cybersecurity.

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Alarm Management CFSE Cybersecurity cybersecurity Dr. William Goble exida exSILentia Failure Rates FMEDA functional safety Functional Safety IEC 61508 IEC 61511 IEC 62443 IEC61511 ISA-18.2 Iwan van Beurden John Yozallinas Loren Stewart Patrick O'Brien PFDavg PLC safety lifecycle SIF SIL silsafe SIS Steve Gandy Ted Stewart Todd Stauffer