Last week at the Emerson Exchange conference, I caught up with Emerson’s Riyaz Ali. You may recall Riyaz from many safety instrumented system-related posts. We discussed some of the trends in integrated positioners + solenoid valves + limit switches + valve position transmitters. Riyaz felt that this approach not in line with the safety instrumented […]
This past Emerson Exchange conference has a treasure trove of presentations as it does every year. I’ve gone into the trove and mined this presentation, Measurement Diagnostics in Safety Instrumented Systems, by Emerson’s Mark Menezes. The presentation is based on an article from several years ago, Measurement Best Practices for Safety Instrumented Systems by Mark […]
A reader emailed some great questions to an earlier post, Clarifications on the Use of the DVC6000 SIS in Safety Applications. The post, featuring the thoughts of Emerson’s Riyaz Ali, addressed misconceptions about the use of digital valve controllers and solenoids in safety instrumented functions (SIFs). I turned to Riyaz to help me address the […]
The language of process safety is filled with its own jargon. Architectures are described as 1oo1, 1oo2, 2oo2, 2oo3, etc. The “oo” means “out of”. So, 1oo1 means one-out-of-one. William M. Goble and Harry Cheddie wrote a book, Safety Instrumented Systems Verification – Practical Probabilistic Calculations, to explain how to do probabilistic calculations based on […]
Emerson’s Dale Perry alerted me to a great article on safety-certified sensors in the November 2008 issue of Control Engineering magazine. Dale manages the Rosemount pressure measurement line of products. The article, Practice Safe Sensing; Safety-certified sensors promise to cut costs and boost performance. But the tradeoffs must be carefully considered., described the advances in […]
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