Activity
    • 20 May 2020

    Digitalization for Improved Valve Reliability

    How do you keep up with the performance of your valves given their importance to safe, efficient and reliable process operations? In a Pumps&Systems article, Digitalization to Predict Reliability of Mechanical Valves , Emerson’s Riyaz Ali shares ways continuous monitoring technology can help. Riyaz opens noting these valves or final control elements (FCEs) connected to the basic process control system (BPCS): …are...
    • 10 Apr 2019

    Avoid Operational Issues with Proper Control Valve Selection

    Because they directly touch the process flow, control valves play a significant role in the stability, robustness and variability in the process. One bad-acting control valve can create large problems for safe and reliable operations. James Beall At last week’s AIChE Spring Meeting , Emerson’s James Beall presented Specifying Control Valve Performance to Achieve Desired Process Performance. In his comprehensive presentation...
    • 10 Apr 2019

    Avoid Operational Issues with Proper Control Valve Selection

    Because they directly touch the process flow, control valves play a significant role in the stability, robustness and variability in the process. One bad-acting control valve can create large problems for safe and reliable operations. James Beall At last week’s AIChE Spring Meeting , Emerson’s James Beall presented Specifying Control Valve Performance to Achieve Desired Process Performance. In his comprehensive presentation...
    • 19 Dec 2018

    Simplifying Safety Valve Proof Testing

    A safety instrumented function (SIF) within a safety instrumented system (SIS) consists of a sensor, logic solver, and final element. As part of the IEC 61511 global safety standard, these elements within the SIF must be tested during the operational phase of the safety lifecycle. Of the 3 elements, the final control element, typically a safety valve, has mechanical movement which must be tested. In a Processing magazine...
    • 19 Dec 2018

    Simplifying Safety Valve Proof Testing

    A safety instrumented function (SIF) within a safety instrumented system (SIS) consists of a sensor, logic solver, and final element. As part of the IEC 61511 global safety standard, these elements within the SIF must be tested during the operational phase of the safety lifecycle. Of the 3 elements, the final control element, typically a safety valve, has mechanical movement which must be tested. In a Processing magazine...
    • 13 Dec 2018

    Partial Stroke Test for Final Elements—Diagnostic Coverage Factors

    Author: Riyaz Ali Partial stroke test is one of the viable means to check mechanical integrity of Final Element of Safety Instrumented Function (SIF) loop. Generally, end users struggle on question of credit of PST for improvement in SIL (Safety Integrity Level). IEC 61508 and IEC 61511 define diagnostic coverage factors (DCF), but do not provide a prescriptive way to estimate the number applied in real process...
    • 13 Dec 2018

    Partial Stroke Test for Final Elements—Diagnostic Coverage Factors

    Author: Riyaz Ali Partial stroke test is one of the viable means to check mechanical integrity of Final Element of Safety Instrumented Function (SIF) loop. Generally, end users struggle on question of credit of PST for improvement in SIL (Safety Integrity Level). IEC 61508 and IEC 61511 define diagnostic coverage factors (DCF), but do not provide a prescriptive way to estimate the number applied in real process...
    • 2 Jan 2018

    Low-Bleed or Standard Relays for Control Valves?

    Happy New Year everyone! I hope your holidays helped to recharge your batteries and get you off to a great start for 2018. I saw this exchange in my email over the holidays about the effects of using low-bleed relays with Fisher DVC6200 digital valve controllers for control applications as compared to standard relays. This question was in response to a blog post from many years ago, Positioner Pneumatic Pressure Bleed...
    • 2 Jan 2018

    Low-Bleed or Standard Relays for Control Valves?

    Happy New Year everyone! I hope your holidays helped to recharge your batteries and get you off to a great start for 2018. I saw this exchange in my email over the holidays about the effects of using low-bleed relays with Fisher DVC6200 digital valve controllers for control applications as compared to standard relays. This question was in response to a blog post from many years ago, Positioner Pneumatic Pressure Bleed...
    • 2 Jan 2018

    Low-Bleed or Standard Relays for Control Valves?

    Happy New Year everyone! I hope your holidays helped to recharge your batteries and get you off to a great start for 2018. I saw this exchange in my email over the holidays about the effects of using low-bleed relays with Fisher DVC6200 digital valve controllers for control applications as compared to standard relays. This question was in response to a blog post from many years ago, Positioner Pneumatic Pressure Bleed...
    • 2 Jan 2018

    Low-Bleed or Standard Relays for Control Valves?

    Happy New Year everyone! I hope your holidays helped to recharge your batteries and get you off to a great start for 2018. I saw this exchange in my email over the holidays about the effects of using low-bleed relays with Fisher DVC6200 digital valve controllers for control applications as compared to standard relays. This question was in response to a blog post from many years ago, Positioner Pneumatic Pressure Bleed...
    • 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 leave...
    • 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 leave...
    • 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 leave...
    • 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 leave...
    • 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 of the...
    • 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 of the...
    • 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 of the...
    • 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 of the...
    • 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 reverse-acting actuator...
    • 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 reverse-acting actuator...
    • 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 reverse-acting actuator...
    • 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 reverse-acting actuator...
    • 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) which brings...
    • 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) which brings...