Posts Tagged ‘Riyaz Ali’

Safety Shutdown Valve Local Control Panel

Posted in Final Control Element on Tuesday, October 4th, 2016. No comments yet
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For process manufacturers and producers with safety shutdown applications, local control panels are often installed to provide visibility and control actions to operators locally out in the process area. Actions can be taken at these panels to initiate an emergency shutdown. I caught up with Emerson’s Riyaz Ali about how these local control panels work […]

Testing Valves in Safety Instrumented Functions

Posted in Controllers & Positioners, Safety on Friday, August 26th, 2016. No comments yet
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Safety instrumented systems are a critical part of process manufacturers and producers overall process safety management in protecting personnel, environment, equipment, property, reputation and image. In an Offshore Engineer article, Safety Instrumented Function loop ‘final element’ problems and solutions, Emerson’s Riyaz Ali describes the importance and ways to test the final control elements in these […]

Separate versus Integral Final Element Accessories Questions

Posted in Final Control Element, Safety on Thursday, December 10th, 2015. No comments yet
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A post from a few years ago, Separate Versus Integral Final Element Accessories in Safety Applications, continues to generate some good questions. I thought I’d make these questions and associated answers more visible in today’s post. Here’s the first question: I understood the whole description, But while calculating PFDavg, We will have to add the […]

Positioner-Only Configuration on Digital Valve Controller

Posted in Final Control Element on Tuesday, November 10th, 2015. No comments yet
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I wanted to share a quick question and answer in an email exchange in case you may have a similar question sometime down the road. The original question was: The Project is about installing two manual Fisher control valves but we want to modify it to include obtaining feedback positions back to the Control Room. […]

When is a Safety Integrity Level Rating of a Valve Required?

Posted in Final Control Element, Safety on Tuesday, November 3rd, 2015. No comments yet
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Control valves play a large role in process control. Emerson’s Riyaz Ali shared with me that he is often asked about their use in safety instrumented functions (also known as safety loops). When asked recently, he shared an ISA Safety Division newsletter from the fall of 2007. Unfortunately, I couldn’t find the newsletter in my […]