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Archive for the ‘Safety’ Category

Self-Contained Hydraulic Emergency Shutdown System

Posted in Actuator, Safety on Tuesday, January 21st, 2020. No comments yet
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A safety instrumented function (SIF) in a safety instrumented system (SIS) contains a sensor, logic solver and final element. All must function properly in the event of a safety demand to take the process into a safe state in coordination with other SIFs. The final element consists of several parts including the isolation valve, actuator, […]

Non-contacting Radar for Automatic Tank Gauging and Overfill Prevention Systems

Posted in Safety, Tank Gauging on Monday, January 20th, 2020. No comments yet
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Bulk liquid storage tanks often contain fluids that are hazardous, flammable and/or explosive. These tanks require not only a control system to control levels but and overfill prevention system (OPS) as layer of protection beyond the control system. This basic process control system (BPCS) is commonly referred to as an automatic tank gauging (ATG) system […]

Understanding Functional Safety Concepts and Final Element Suitability

Posted in Final Control Element, Safety on Wednesday, January 8th, 2020. No comments yet
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The world of functional safety has its own tribal language and acronyms, e.g. safety instrumented systems (SISs), safety instrumented functions (SIFs), logic solvers, final elements (FEs), safety integrity level (SIL), probability of failure on demand (PFD), etc. In a Hydrocarbon Engineering article, Keep in the Safety Loop, Emerson’s Riyaz Ali does an excellent job of […]

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 […]