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Failure Modes of Positioners in Safety Applications

Posted in Final Control Element, Safety on Wednesday, October 6th, 2010. No comments yet
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A few weeks ago, I highlighted a thread from the ISA Safety email list on partial stroke testing using control valve positioners. A few weeks later, this thread is still going strong. Emerson’s Riyaz Ali sent me some of the recent exchanges. A concern was expressed about the failure modes in an I/P [current-to-pneumatic] converter […]