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Separate Versus Integral Final Element Accessories in Safety Applications

Posted in Final Control Element, Safety on Monday, October 21st, 2013. 10 comments so far
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Final elements such as safety shutdown valves, emergency isolation valves, blowdown valves, etc., in safety instrumented functions (SIFs) are equipped with various accessories such as digital valve controllers, solenoid valves (SOV), and volume boosters, to name a few. Emerson’s Riyaz Ali shared a draft of a paper he is developing about the different approaches with […]

2011 Emerson Exchange – Addressing Partial Stroke Testing Fears – Avoiding False Trips, Risk Through…

Posted in Emerson Exchange, Final Control Element, Safety on Tuesday, October 25th, 2011. No comments yet
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Exida’s Dr. William Goble and Emerson’s Afton Coleman presented Addressing Partial Stroke Testing Fears – Avoiding False Trips / Risk Through… Their abstract: It is not uncommon for some users to perform partial stroke testing (PST) using cumbersome mechanical or pneumatic devices, or avoid PST altogether due to fears of spurious trip. This workshop addresses […]

Addressing Safety Valve Opening Times with Partial Stroke Tests

Posted in Final Control Element, Safety on Tuesday, September 21st, 2010. No comments yet
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A question came into the ISA’s Safety email list concerning the use of valve positioners in partial stroke tests for valves used in safety shutdown applications. The person asking the question wrote: I was informed that PST using positioner such as the Fisher/Emerson has got problem when first opening the valve because the CV value […]