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Archive for the ‘Safety’ Category

Reducing Level Detector Proof Testing Complexity

Posted in Level, Safety on Tuesday, July 16th, 2019. No comments yet
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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 […]

Cybersecurity Considerations in Safety Instrumented System Architectures

Posted in Safety on Wednesday, June 19th, 2019. No comments yet
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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 […]

Storage Tank Overfill Protection

Posted in Level, Safety on Monday, May 6th, 2019. No comments yet
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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 […]

Remote Proof Testing Safety Level Switches

Posted in Level, Safety on Monday, April 22nd, 2019. No comments yet
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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 […]

Integrated versus Separate Control and Safety

Posted in Safety on Wednesday, February 6th, 2019. No comments yet
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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 […]