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...

Do I really need my SIS to be cyber secure?

In the good old days, most Industrial Automation and Control System (IACS) networks were air-gapped from the business network and the Int...

What do I claim is my Proof Test coverage?

Nowadays many devices are designed with efficient internal diagnostic capabilities. For some smart transmitters the automatic diagnostics...

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...

I use my process control system for all automation requirements. So what is so special about a SIS?

Many people are unsure of the the difference between a safety instrumented system (SIS) and your process control DCS (BPCS). Both have ...

Do you need to use third party certified software tools when configuring a safety instrumented system (SIS) or SIS devices?

There is always a dilemma for users as to whether it is a mandatory requirement to use a third party certified tool when configuring a saf...