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…
exida explains Blog
Entries tagged with: Sil Verification Calculations
- by Iwan van Beurden, CFSE
- Wednesday, March 20, 2013
- Software
Changing the PVST Interval. Hey, my failure rates changed!
- by Dr. Steve Gandy, CFSP
- Monday, May 11, 2026
- Functional Safety
SIL Verification - Beyond PFDavg / PFH
Have you ever heard people say, “I’ve met the PFDavg target, so I’ve met my SIL target?” It’s true that in low demand we need to meet the PFDavg (or PFH for High/Continuous mode) requirement for the Safety Instrumented Function (SIF) but this is just one of three requirements…