Was not the response I was expecting to hear from an audience member during my presentation on new SIS (safety instrumented system) hardware development at this week’s ISA Expo.  He obviously was concerned over my suggestion that with new SIS technology there’s no degradation of safety when you have a partial shutdown and, ...

A recent “Market Intelligence” report on Safety Instrumented Systems (SIS) had me shaking my head.  What really surprised me about their reported findings was on the heavily debated topic of SIS independence.  For those who like reading my BLOG, but are not (yet) process safety gurus, please allow me to explain.  For the ...