Activity

  • Top-Entry Triple Offset Valves in LNG Applications

    Jim Cahill
    The global natural gas market continues to develop as additional liquefied natural gas (LNG) facilities come online across the world. These LNG facilities have many challenges including equipment such as valves which come in contact directly with the cryogenic process . Considerations not only include fit for the application, but also how to safely and effectively perform any ongoing maintenance. Alberto Bertamoni…

  • Safety Instrumented Function Valve Selection

    Jim Cahill
    Valves are critical components inside of safety instrumented functions (SIFs) since they do the work of touching the process flows to bring the plant to a safe state in the event of a safety demand. In a Valve magazine article, How Valve Selection Can Impact SIS in Refining Applications , Emerson’s Janine McCormick describes the important criteria in finding the right valve for the required safety performance. Janine…

  • Managing Natural Gas Distribution Networks Pressure and Flow Rates

    Jim Cahill
    The role of natural gas in the global energy mix continues to expand as it displaces coal and nuclear power as a baseload source of energy for electrical power generation. It is also an energy source for heating and cooking in many homes. Emerson’s Sergio Pasquali describes the role of smart skids in the natural gas distribution network in this 3:32 YouTube video, The Solution for Tomorrow Energy Systems . It is distributed…

  • Pressure Relief Valve Fugitive Emissions Testing

    Jim Cahill
    Earlier this week, the Valve World Americas Expo & Conference convened in Houston, Texas. This gathering provides an opportunity for flow control industry professionals to share experiences, insights and to collaborate to resolve common challenges. Emerson’s Dr. Amr Gado , D. Emile Tezzo , and Calvin Deng prepared a presentation, Pressure Relief Valves Fugitive Emissions Testing which was given by Amr at this conference…

  • Reducing Storage Tank Thief Hatch Emissions

    Jim Cahill
    Regulations on emissions for process manufacturers and producers have continued to grow ever stringent. Storage tanks in oil and gas production sites account for a sizable percentage of volatile organic compound (VOC) emissions. To address these regulations, you may have seen last week’s news, New ultra-tight thief hatch reduces storage tank emissions, conserves tank contents . I caught up with Emerson’s Steve Attri…

  • 5 Questions for Digital Valve Controller and Safety Expert Riyaz Ali

    Jim Cahill
    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…

  • Educational Video on Control Valve Cavitation

    Jim Cahill
    Wikipedia defines cavitation as: …the formation of vapour cavities in a liquid – i.e. small liquid-free zones (“bubbles” or “voids”) – that are the consequence of forces acting upon the liquid. It usually occurs when a liquid is subjected to rapid changes of pressure that cause the formation of cavities where the pressure is relatively low. When subjected to higher pressure, the voids implode and can generate an…

  • Control Valve Condition Monitoring Connected Services

    Jim Cahill
    As sensors and final control elements grow ever smarter with digital diagnostics and communications paths, the need to make sense of this data to improve safety, reliability and efficiency also grows. Not only is improved analytic software required to help spot trends and abnormalities, but also experts to help provide guidance to put this information into action. In this 5:07 video, Emerson Connected Services Valve…

  • Optimizing Gas Turbine Fuel Gas Supply

    Jim Cahill
    The mission of this blog has always been to bring the experts around Emerson to you. Many of these folks also share their expertise in our Emerson Exchange 365 global user community and with LinkedIn posts. I’ll highlight an example I saw today. Emerson’s Rossella Mimmi published a post, Gas Conditioning: Why, When and How . In it, she opens: Natural Gas has become the desired fuel for gas turbines used in modern…

  • Controlling Liquid Pipeline Surge Pressure

    Jim Cahill
    The RBN Energy blog is a must read for those in the oil & gas upstream, midstream and downstream industries as they analyze the trends and global dynamics impacting companies. Posts such as The Flows They Are A-Changin’ – Westward Natural Gas Flows Into Texas On The Rise describe the flow reversals in natural gas in the U.S. as LNG plants are built along the Gulf coast and vast amounts of shale gas are produced in the…

  • Selecting the Right Valve

    Jim Cahill
    At the Emerson Exchange conference in Austin, Emerson’s Tony Foster and Leah Stanley and Vinson Supply’s Robert Lange presented, Selecting the Right Valve for Your Application to Reduce Cost and Increase Performance. Their abstract: Selecting the optimum valve for the application can sometimes be a daunting task, even with a “simple” on/off valve, especially when the process operates at high or low temperatures and…

  • Mitigating Cavitation and Outgassing Control Valve Damage

    Jim Cahill
    At the Emerson Exchange conference in Austin, Emerson’s Jonathan Vance presented Outgassing and Cavitation: Not So Good Vibrations. Here’s the abstract: Outgassing and cavitation are two of the most common issues associated with control valves. Both phenomena often occur in high pressure drop applications and result in excessive vibration; however, the solutions to combat these critical applications vary greatly. This…

  • Safety Shutdown Valve Local Control Panel

    Jim Cahill
    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 with safety shutdown valves (SSVs) and the digital valve controllers…

  • Testing Valves in Safety Instrumented Functions

    Jim Cahill
    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 safety loops…

  • Stay on Top of Your Tanks

    Jim Cahill
    For storage tanks, controlling emissions is a high priority concern. A pressure vacuum relief valve (PVRV) is a critical component in managing pressure. Knowing when and for how long it opens to release pressure also helps to determine what emissions occurred. In this quick 1:52 video, PVRV with Smart Wireless Technology , Emerson’s Steve Attri , explains how wireless technology can help determine if the PVRV is…

  • Adsorption Process to Separate Fluid Components

    Jim Cahill
    Many techniques are used to separate impurities in fluids. One common method is to use the process of adsorption. In an online document, Control Valve Sourcebook — Chemical Unit Operations , adsorption is defined as: …a typical mass transfer operation used in process plants to remove or separate specific components of a liquid or gaseous mixture. The specific definition of adsorption is the adhesion of atoms, ions…

  • How to Disassemble a Daniel Digital Control Valve

    Jim Cahill
    Let’s continue our series of practical “ How-to videos ” with a closer look at disassembling a Daniel V788 digital control valve . The valves are used effectively in loading and offloading applications that require precise flow rate control and batch delivery of fluid products. In this 7:36 video , Emerson’s Jerome Lopez demonstrates the disassembly process that may be done during service repair, refurbishing or preventive…

  • Monitoring Storage Tank Emergency Vents

    Jim Cahill
    You will find low-pressure storage tanks in many industries including oil and gas, chemical, petrochemical, pharmaceutical, and food and beverage. Emergency vents have traditionally been used as the last line of defense in overpressure situations. In a new whitepaper, Benefits of Wireless Monitoring of Storage Tank Emergency Vents , Emerson’s Steve Attri describes how the ability to monitor pressure release conditions…

  • Surge Relief for Oil and Gas Liquids Pipelines

    Jim Cahill
    Authors: Rossella Mimmi and Dave Seiler Petroleum commodity releases can have serious consequences, so ensuring pipeline integrity is crucial for operators. Pipeline integrity is not just about preventing incidents, but is a holistic approach to the prevention, detection, and mitigation of these undesired commodity release such as surge. In this two-part series, we will provide background information on surge relief…

  • Sizing Control Valves for Outgassing Applications

    Jim Cahill
    Ardent Photography . Some rights reserved. (CC BY-ND 2.0) Think about what occurs when you open a bottle of champagne. Immediately the pressure inside the bottle drops to atmospheric pressure. This is below the pressure that allows the dissolved carbon dioxide to remain in solution, thus the CO2 gas is released. This sudden release of the dissolved gas is referred to as “Outgassing.” You may have also noticed the rapid…

  • Reducing Valve-Induced Unplanned Downtime

    Jim Cahill
    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 report…

  • Simplifying Pneumatic Valve Installation, Commissioning and Operation

    Jim Cahill
    For many applications in the process manufacturing and production industries, solenoid valves are used to “shut off, release, dose, distribute or mix fluids.” Wikipedia defines a solenoid valve as: …an electromechanically operated valve . The valve is controlled by an electric current through a solenoid : in the case of a two-port valve the flow is switched on or off; in the case of a three-port valve, the outflow…

  • Remotely Monitoring Storage Tank Pressure and Vacuum Relief Valves

    Jim Cahill
    In current times where oil supply exceeds demand, storage tanks are filling. A recent Reuters article, Oil glut up close: How Cushing copes with full crude tanks notes: There may be no better place to witness what a world awash in crude looks like, and the 9 square-mile (23.3 square km)complex seems to bear out oil traders’ fears that the industry is running out of space to contain a historic supply glut that has hammered…

  • Pressure Regulators in Upstream Oil and Gas Processing Applications

    Jim Cahill
    Managing pressures are a large part of the control strategies for upstream oil and gas applications. These pressures include those in the main processing lines, fuel lines and vapor spaces found in storage tanks. Emerson’s Thomas Weyer shared a new pressure regulator upstream oil and gas application map with me. It was designed to show the options of pressure regulators upstream and downstream of the equipment typically…

  • Setting Up and Calibrating Valve Positioners

    Jim Cahill
    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…

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