Posts Tagged ‘2oo2’

Redundancy and Diagnostics in Safety Instrumented System Sensors

Posted in Safety on Wednesday, December 12th, 2012. 2 comments so far
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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 […]

Q and A on Digital Valve Controllers and Solenoids in Safety Applications

Posted in Final Control Element, Safety on Tuesday, August 21st, 2012. No comments yet
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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 […]

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 […]

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