Posts Tagged ‘Probability of Failure on Demand’

Control Valve Suitability in Safety Applications

Posted in Final Control Element, Safety on Wednesday, April 8th, 2015. No comments yet
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Sometimes an email exchange turns up something developed years ago that still has great value. So is this case with an article I received as an attachment on final control elements and their suitability in safety instrumented functions (SIFs), a.k.a. safety loops. The article, When SIL suitability is required for final control elements, was written […]

10 Ways to Improve Functional Safety

Posted in Safety on Wednesday, November 13th, 2013. One comment so far
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ISA Portugal recently hosted a conference on functional safety. Emerson’s Russell Cockman, whom you may recall from earlier safety-related posts, presented 10 ways to improve functional safety without worrying where to put the decimal point in the calculation. From his title, you might anticipate that Russell would bring his humor to the serious subject of […]

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 […]

Detecting Loop Electrical Integrity Issues

Posted in Pressure, Technologies on Thursday, March 8th, 2012. No comments yet
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Advanced diagnostics are improving our lives in many ways from healthcare to transportation. And in our world of process automation, they are fundamentally changing the way we operate and manage our plants. In an earlier post, A High-Speed, Statistical View for Better Decision Making, I shared how statistical process monitoring (SPM) techniques can help spot […]

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 […]