exida Recorded Webinars

Assessment of Final Element Assemblies

Recording Date: January 2018

IEC 61511 places an emphasis on the proper specification, design and integration of final elements, and doing these steps correctly is necessary to ensure a SIL capable system is deployed. As users collect more data through testing methods, they are discovering that final element assemblies are not always performing reliably throughout their mission time. Two observed failures are torque/force that is insufficient to move the valve to the safe state and mechanical failure of final element components from stress beyond the element’s ultimate strength. These failures modes are evidence that the current processes need to be enhanced. One proposed means of addressing these shortcomings is to assess not only the individual devices that make up the final element but also to assess the complete final element. This webinar will review the steps required to complete a final element assessment.

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About the Presenter:

Chris O'Brien, CFSE

Chris O'Brien Chris O’Brien is a Partner with exida. He has over 30 years of experience in the design,manufacturing, and marketing of process automation, reserve power systems, and safety related equipment. His main focus includes supporting new and existingcustomers with their implementation of the IEC 61508 and IEC 61511 functional safetystandards, as well as reliability analysis for mechanical devices. Mr. O’Brien is the author of “Final Elements and the IEC 61508 and IEC 61511 Functional Safety Standards” and has been awarded 5 patents, including a patent for the industry’s first safety rated pressure transmitter.