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Posts Tagged ‘1oo1’

Safety Instrumented System Solenoid-Operated Valve Approaches

Posted in Safety on Thursday, October 16th, 2014. No comments yet
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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 […]

Safety Instrumented System Architecture Diagnostics

Posted in Safety, Technologies on Tuesday, September 13th, 2011. One comment so far
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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 […]