Emerson Exchange 365
Blogs
    • 3 May 2017

    5 Questions for Digital Valve Controller and Safety Expert Riyaz Ali

    Let’s continue our 5 Questions for an Emerson Expert podcast series with our guest, Riyaz Ali . You may recall Riyaz from numerous posts about digital valve controllers and final control elements in safety instrumented system applications. He has almost 40 years’ experience in process control instrumentation and holds numerous patents related to use of digital valve controllers for process industries. Please...
    • 26 May 2016

    Reducing Valve-Induced Unplanned Downtime

    Valves are the critical components in any process manufacturing and production operation that touches what is being produced. As such, they are subject to wear and tear. An ARC View report, Leveraging IIoT Technologies to Reduce Valve-Related Unplanned Downtime highlights key points from a presentation by Emerson’s Shawn Anderson at the ARC Advisory Group’s 20 th Annual Industry Forum. Here is the recap...
    • 15 Feb 2016

    Setting Up and Calibrating Valve Positioners

    Short videos are great ways to show how to perform an activity, such as calibrating a valve’s actuator to move the valve stem based on the 4-20mA signal it receives from the control system. In this under 5-minute “how-to” video , Emerson’s Alex Quah Shu Min demonstrates the setup and calibration procedure for the Fisher 3582i electro-pneumatic, single-acting positioner on a Fisher 667 Size 30...
    • 10 Dec 2015

    Separate versus Integral Final Element Accessories Questions

    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 Failure rate of valve assembly (Valve+Actuator...
    • 28 Aug 2015

    Mounting Digital Valve Controller Howto Video

    It has been a busy week as many of the experts around Emerson Process Management here in Austin to work on ways to improve their participation in the social channels. James Holloway I wanted to share a “how to” video, Mounting a Fisher FIELDVUE DVC6200 Digital Valve Controller to a 657 Actuator . In it, Engineering/Industrial Management student and former Emerson intern James Holloway shows the process...
    • 10 Feb 2015

    Does Flow Loop Make Valve Positioner Unnecessary?

    In the Process Control LinkedIn group, a question was asked : Positioners seem very popular now, but most lines with valves have flow meters attached. Won’t a flow loop make the positioner redundant? When asked for clarification, the original poster explained: As far as I understand them, a positioner simply moves the stem to a particular position governed by the control signal (unlike a ‘non-positioner’...
    • 16 Oct 2014

    Safety Instrumented System Solenoid-Operated Valve Approaches

    Last week at the Emerson Exchange conference, I caught up with Emerson’s Riyaz Ali . You may recall Riyaz from many safety instrumented system-related posts . We discussed some of the trends in integrated positioners + solenoid valves + limit switches + valve position transmitters. Riyaz Ali Senior Business Development Manager Riyaz felt that this approach not in line with the safety instrumented system (SIS...
    • 8 Oct 2014

    Using Wireless Throttling Valves in Column Control

    Emerson's Kurtis Jensen and Terry Blevins teamed up with the University of Texas at Austin's Stephen Briggs to control a column with wireless valves. Their abstract: The control performance that may be achieved using wireless throttling va...
    • 27 Feb 2014

    Safety Valve Positioners and Common Cause Failure Questions

    If you work with pumps in your facility, you may be familiar with the Empowering Pumps site, a wealth of information to help you with these important assets in your plant. Founder Charli K. Matthews has launched something similar for valves, Empowering Valves . I had the opportunity to contribute a guest post, Common Cause Failures in Safety Valve Positioners? It was based on a question I recently received. The question...
    • 10 Jan 2014

    Providing Operators Process Control Valve Position Feedback

    Control systems provide signals to control valves to regulate their position per the requirements of the control strategy. It is good engineering practice, especially for critical control valves to have valve travel feedback from independent devices such as position transmitters, limit switches, or positioner output feedback. Emerson’s Riyaz Ali , whom you may recall from earlier posts , shared ways this position...