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. The next question is, "Why...
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...
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....
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...
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...
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...
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...
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...
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...
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...
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...
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...
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The opinions expressed here are the personal opinions of the authors. Content published here is not read or approved by Emerson before it is posted and does not necessarily represent the views and opinions of Emerson.