Is it safe? Advice on assessing the suitability of electrical devices for use in a safety instrumented function

When designing safety instrumented functions (SIFs) for a process operation, it is not unusual to find devices such as electrical motors, ...

Calculating the proof test effectiveness for a Partial Valve Stroke Test application

The final element of a safety instrumented function is usually the greatest contributing part of the overall SIF PFDavg calculation. Valv...

What does the term ‘MTTR’ signify for a SIF?

A Safety Requirements Specification (SRS) will typically specify the values for Mean Time to Restoration for each identified Safety Instru...

What is the target failure measure for your SIF?

"Which failure measure should I use for my Safety Instrumented Function (SIF)? Is PFDavg or PFH more appropriate?" Unfortunately...