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...
IEC 61511
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...
Partial Stroke Test for Final Elements—Diagnostic Coverage Factors
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...
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...
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...
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...
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...
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...
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,...
Focus on the Process in Your Safety Requirements Specification
A safety requirement specification (SRS) for a safety instrumented system (SIS), as part of the IEC 61511 global safety standard [from the exida blog]: …incorporates all the analysis done during the Risk Assessment, HAZOP [hazard and operability study]/PHA [process...
Cures for Common Tank Gauging Problems
Accurately knowing the level in liquid storage tanks is not only important from a safety standpoint, it's important to know for accounting, finance, and sales perspective. Accurate and reliable tank gauging systems can improve the performance of the oil & gas,...
Embracing Safety Requirements Specifications
The Institute of Measurement and Control is hosting the Functional Safety 2016 conference this week in London. This conference seeks to engage practitioners from a wide variety of industrial sectors who have responsibilities in any functional safety lifecycle phase to...
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