Posts Tagged ‘IEC 61511’

Level Sensor Safety Proof Testing

Posted in Level, Safety on Thursday, July 13th, 2017. No comments yet
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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 assure that each safety instrumented function (SIF)/safety loop does what […]

Remote Partial Proof Testing Level Sensors

Posted in Level, Safety on Friday, June 30th, 2017. No comments yet
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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 (SIS) in a hazardous or fail-to-function state. If undetected, in the case of level measurements, this […]

Optimizing Safety Instrumented System Proof Testing

Posted in Safety on Monday, May 8th, 2017. No comments yet
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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, written by Emerson’s Afton Coleman, Erik Mathiason and Tonya Wyatt does a […]

Focus on the Process in Your Safety Requirements Specification

Posted in Safety on Friday, March 17th, 2017. No comments yet
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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 hazard analysis] and LOPA [layer of protection analysis] reviews. Emerson’s Russell Cockman presented at an Institute […]

Cures for Common Tank Gauging Problems

Posted in Tank Gauging on Friday, November 11th, 2016. No comments yet
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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, refining, chemical & petrochemical, and other industries that have these storage tanks as part […]