Activity
    • 30 Aug 2019

    Security for Safety System Logic Solvers-Physical Key Switches and Software Locks

    Sergio Diaz Author: Sergio Diaz As a product marketing manager for DeltaV safety instrumented systems (SIS) , I have been asked a few times why the key switch on the CHARMs Smart Logic Solver (CSLS) does not control the lock state as is common with many safety controllers. DeltaV CHARMs Smart Logic Solver (CSLS) The next question is, “Why does the user still need to lock the CSLS via software?” The reason is...
    • 16 Jul 2019

    Reducing Level Detector Proof Testing Complexity

    Each safety instrumented function (SIF) including its sensor, logic solver and final control element must be periodically tested to make sure it will perform as designed in the event of a safety demand. These “proof tests” help to uncover and failure conditions which may have developed since the last proof test or safety demand. A new whitepaper, Reducing the Complexity of Proof-Testing with New Generation Point Level...
    • 19 Jun 2019

    Cybersecurity Considerations in Safety Instrumented System Architectures

    Sergio Diaz Alexandre Peixoto Safety instrumented systems (SIS), which are designed to take the process to a safe state in trip conditions, come in several architectures with the basic process control system (BPCS). The SIS and BPCS can be totally separate, interfaced or integrated, yet separate. While the debate on which approach is best has been going on for a long time, what are they cybersecurity considerations...
    • 6 May 2019

    Storage Tank Overfill Protection

    Lydia Miller AnnCharlott Enberg Preventing overfill conditions in tanks and vessels is a job for safety instrumented systems across many industries. In a Flow Control article, A Systemic Approach to Storage Tank Overfill Protection , Emerson’s Lydia Miller and AnnCharlott Enberg describe the key components in a comprehensive tank management system to meet the safety requirements for the application. Lydia and AnnCharlott...
    • 22 Apr 2019

    Remote Proof Testing Safety Level Switches

    One of the necessities in managing safety instrumented systems throughout the IEC 61511 safety lifecycle is to perform periodic proof tests on the components in a safety instrumented function to verify proper function. A short 2:44 YouTube video, How to Remotely Proof-Test the Rosemount 2140:SIS shows how this proof testing can be performed remotely for safety level switches to save time & costs and reduce risk. ...
    • 6 Feb 2019

    Integrated versus Separate Control and Safety

    Panelists at a session at the 2019 ARC Industry Forum , Safety Systems: Integrated versus Not? Does It Really Matter?, set out to discuss the pros and cons of the approaches and how they accommodate different risk factors. ARC Advisory Group’s Mark Sen Gupta moderated this panel which included executives from Air Products & Chemicals, Dow Chemical, Chevron Energy Technology, and exida. Mark covers the process safety...
    • 6 Feb 2019

    Integrated versus Separate Control and Safety

    Panelists at a session at the 2019 ARC Industry Forum , Safety Systems: Integrated versus Not? Does It Really Matter?, set out to discuss the pros and cons of the approaches and how they accommodate different risk factors. ARC Advisory Group’s Mark Sen Gupta moderated this panel which included executives from Air Products & Chemicals, Dow Chemical, Chevron Energy Technology, and exida. Mark covers the process safety...
    • 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...
    • 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...
    • 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...
    • 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...
    • 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

    Kevin Simmons Marcelo Dultra 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...
    • 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...
    • 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...
    • 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...