Activity
    • 20 Dec 2018

    Simplifying Safety Instrumented System Modernization Projects

    One of my first assignments as a newly minted Electrical Engineer was to tend to a triple modular redundant (TMR) safety instrumented system (SIS) on an offshore Gulf of Mexico oil & gas gathering facility. This was back in the 1980s when these systems were introduced. Many manufacturers and producers have these older safety systems that have been in operation for decades. I mention this since I received a note from...
    • 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...
    • 3 Oct 2018

    Simplifying Burner Management System Architecture

    Emerson’s Zach Brooks and Steven Kormann described how compliance with National Fire Protection Association (NFPA) with modern burner management and combustion control hardware systems has been simplified. They explored how recently released (and upcoming) standard changes have forced the evolution of best practices based on modern hardware solutions. The acceptance of SIL-capable instrumentation has become more commonplace...
    • 21 Sep 2018

    Optimizing Pressure Relief Valve Lifecycle Management

    Pressure relief valves (PRVs) are critical safety and equipment protection devices to prevent overpressure conditions. They need ongoing maintenance to assure that they operate as designed for their intended applications. In a Valve magazine article, Lifecycle Management of Pressure Relief Valves , Emerson’s Kevin Simmons and Marcelo Dultra describe considerations for effective and efficient PRV sizing, selection...
    • 30 Aug 2018

    Preventing Over-Pressurization with HIPPS

    Wikipedia defines a High-integrity pressure protection system (HIPPS) as: …a type of safety instrumented system (SIS) designed to prevent over-pressurization of a plant, such as a chemical plant or oil refinery . The HIPPS will shut off the source of the high pressure before the design pressure of the system is exceeded, thus preventing loss of containment through rupture ( explosion ) of a line or vessel. Therefore...
    • 8 Jun 2018

    Flame and Gas Detection in Layers of Protection

    For manufacturing processes with hazardous substances that are combustible or can cause harm to people and property, flame and gas detection systems are often used as part of the risk mitigation strategy. This 11-minute video, Rosemount Flame and Gas Layers of Protection describes how these sensors are used in layers of protection for the process safety requirements. The video opens explaining why flame and gas...
    • 25 May 2018

    Managing Storage Tank Pressure and Overfill Prevention

    Across the energy supply chain bulk petroleum storage terminals play an important role in managing supply and demand. A critical safety function is to prevent an overfill condition in each of the storage tanks. Another critical function is to manage the pressure inside the tank to avoid overpressure or vacuum conditions that could damage the structural integrity of a tank. In this one-hour recorded webinar, Tank Pressure...
    • 3 May 2018

    Filling Gaps in Global Safety Standards

    A safety instrumented function (SIF)’s purpose is to reduce the risk of a specific hazard. For example, an upset condition in an oil and gas production separator may cause a series of SIFs within a safety instrumented system (SIS) to shut in the wells feeding the separator. A SIF contains a sensor, logic solver and final control element—often an emergency shutdown valve. As a mechanical component of this safety loop...
    • 23 Mar 2018

    Enabling Safer Operator-Machine Interactions through Enhanced Control of Machine Stoppages

    Authors: Enrico De Carolis , Mike Johnson As packaging line machinery has become more sophisticated, it’s also become more complex. This increased complexity, coupled with a high number of interactions between operators and machines, increases the potential for safety incidents. For example, in the packaging world, production lines may stop for manual loading 10-30 times per shift, each time necessitating some...
    • 23 Mar 2018

    Enabling Safer Operator-Machine Interactions through Enhanced Control of Machine Stoppages

    Authors: Enrico De Carolis , Mike Johnson As packaging line machinery has become more sophisticated, it’s also become more complex. This increased complexity, coupled with a high number of interactions between operators and machines, increases the potential for safety incidents. For example, in the packaging world, production lines may stop for manual loading 10-30 times per shift, each time necessitating some form...
    • 14 Mar 2018

    Digital Transformation for Safe Operations

    One of the big topics last week at CERAWeek 2018 was the role technology can play to improve business performance—especially in areas such as safety, reliability and efficiency. These advancing technologies coupled with improved work practices can deliver a digital transformation to companies that undertake this journey. At this week’s Safety Case Symposium 2018 Singapore conference, Emerson’s Jonas Berge is presenting...
    • 14 Mar 2018

    Digital Transformation for Safe Operations

    One of the big topics last week at CERAWeek 2018 was the role technology can play to improve business performance—especially in areas such as safety, reliability and efficiency. These advancing technologies coupled with improved work practices can deliver a digital transformation to companies that undertake this journey. At this week’s Safety Case Symposium 2018 Singapore conference, Emerson’s Jonas Berge is presenting...
    • 15 Jan 2018

    Adding Wireless Level Switches for Storage Tank Overfill Prevention

    Storage tanks holding volatile fluids must have reliable level measurements to avoid unsafe overfill conditions. A Control Engineering Asia article, Wireless vibrating fork technology enables Hengyang Petrochemical to implement cost-effective overfill prevention solution , describes how this petrochemical producer sought to reduce the risk of overfill conditions. The plant had existing non-contacting radar level measurement...
    • 15 Jan 2018

    Adding Wireless Level Switches for Storage Tank Overfill Prevention

    Storage tanks holding volatile fluids must have reliable level measurements to avoid unsafe overfill conditions. A Control Engineering Asia article, Wireless vibrating fork technology enables Hengyang Petrochemical to implement cost-effective overfill prevention solution , describes how this petrochemical producer sought to reduce the risk of overfill conditions. The plant had existing non-contacting radar level measurement...
    • 20 Dec 2017

    Vortex Flow Meters in Safety Instrumented Functions

    Safety instrumented systems provide a layer of protection beyond the control system to safely shutdown the process during abnormal situations. A safety instrumented function (SIF) or “safety loop” includes the sensing device, logic solver and final control element to perform safety function upon demand. Flow measurement devices are often the sensing devices in these SIFs. Some flow measurement technologies may experience...
    • 20 Dec 2017

    Vortex Flow Meters in Safety Instrumented Functions

    Safety instrumented systems provide a layer of protection beyond the control system to safely shutdown the process during abnormal situations. A safety instrumented function (SIF) or “safety loop” includes the sensing device, logic solver and final control element to perform safety function upon demand. Flow measurement devices are often the sensing devices in these SIFs. Some flow measurement technologies may experience...
    • 8 Aug 2017

    Proof Testing Level Measurement Devices

    Safety instrumented systems (SIS) include the sensor(s), final control element(s) and logic solver(s) for each of the safety instrumented functions (SIFs) in the SIS. To verify the SIFs are performing the amount of risk reduction intended for their application, they must be periodically proof tested. PCN Europe magazine interviewed Emerson’s Teddy Tzegazeab on how proof testing has changed for SIFs with liquid level...
    • 8 Aug 2017

    Proof Testing Level Measurement Devices

    Safety instrumented systems (SIS) include the sensor(s), final control element(s) and logic solver(s) for each of the safety instrumented functions (SIFs) in the SIS. To verify the SIFs are performing the amount of risk reduction intended for their application, they must be periodically proof tested. PCN Europe magazine interviewed Emerson’s Teddy Tzegazeab on how proof testing has changed for SIFs with liquid level...
    • 13 Jul 2017

    Level Sensor Safety Proof Testing

    Backing up your computer or server is a waste of time if restoring the backup fails when you need it. Good practice is to test these backups on separate test systems periodically to make sure they restore properly. Similarly, safety instrumented systems (SISs) need to assure that each safety instrumented function (SIF)/safety loop does what it’s intended to do to bring the plant to a safe state in the event of a demand...
    • 13 Jul 2017

    Level Sensor Safety Proof Testing

    Backing up your computer or server is a waste of time if restoring the backup fails when you need it. Good practice is to test these backups on separate test systems periodically to make sure they restore properly. Similarly, safety instrumented systems (SISs) need to assure that each safety instrumented function (SIF)/safety loop does what it’s intended to do to bring the plant to a safe state in the event of a demand...
    • 7 Jul 2017

    Safety Instrumented Function Valve Selection

    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. ...
    • 30 Jun 2017

    Remote Partial Proof Testing Level Sensors

    For safety instrumented functions (SIFs), proof testing is the process of identifying undetected dangerous failures in the sensor, final control element and logic solver which comprise the SIF. Dangerous failures are those that could put the safety instrumented system (SIS) in a hazardous or fail-to-function state. If undetected, in the case of level measurements, this could lead to an overfill and spill, with potentially...
    • 2 Jun 2017

    Instrumentation Diagnostics and Safe, Reliable Operations

    As technology has advanced in power and sophistication, its ability to self-diagnose and perform predictive diagnostics has too. In a Plant Engineering article, Using diagnostic functions to improve system safety , Emerson’s Mark Menezes shares examples of how these diagnostics are used to self-diagnose instrumentation problems as well as those in the surrounding production process. He opens highlighting the benefits...
    • 8 May 2017

    Optimizing Safety Instrumented System Proof Testing

    If you are new to the world of process safety, you quickly learn that it has its own jargon with phrases such as safety instrumented functions, proof test intervals, PDFavg, etc. A Flow Control magazine article, Ensuring safety compliance with optimized proof testing , written by Emerson’s Afton Coleman , Erik Mathiason and Tonya Wyatt does a great job of introducing and explaining these concepts. They open describing...