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Posts Tagged ‘safety instrumented system’

Approaches to Partial Stroke Testing Safety Valves

Posted in Final Control Element, Safety on Wednesday, October 23rd, 2019. No comments yet
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The safety valve within a safety instrumented function (SIF) must be tested regularly to help assure proper operation in the event of a safety demand. Operators usually perform an offline full stroke test during a scheduled shutdown because of the impact of this test on the process. But when a SIF (a.k.a. safety loop) requires […]

Safety Instrumented System Cybersecurity Best Practices

Posted in Cyber-Security, Safety on Wednesday, September 25th, 2019. No comments yet
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Emerson’s Sergio Diaz and Alexandre Peixoto presented Best Practices for a Cybersecure SIS at the 2019 Emerson Exchange conference. Sergio opened that the goal of this presentation is to provide practical information to maintain a more defendable security posture for safety instrumented systems (SISs). Like control systems, defense in depth is an important concept for […]

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

Posted in Safety on Friday, August 30th, 2019. No comments yet
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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. The next question is, “Why does the user still need […]

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 […]