exida Recorded Webinars

How to Cause a False Trip with Your Final Element Design

Recording Date: September 2020

In many industrial processes an automatic safety function is implemented using a remote actuated valve. The design objective is to trip the process when a dangerous condition is detected and to keep the process operating when no dangerous condition is detected. A lot of attention is paid to failures that impact the ability of a safety function to trip. But in many applications a “false trip” is not only costly but may create dangerous situations. Many heritage designs for the pneumatic/hydraulic controls increase the false trip rate. Justification is usually an improvement is safety. This webinar compares several pneumatic designs and shows trip rates and safety probabilities for each design. May the best design win.

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About the Presenter:

Loren Stewart, CFSE

Loren Stewart Loren Stewart graduated from Virginia Tech with a BSME. She has over 10 years of professional experience. She currently works for exida consulting as a safety engineer, focusing on the mechanical aspects of their customers. Along with assessing the safety of products and creating FMEDAs and reports, she researches stiction and is creating a database for the 2H initiative according to IEC 61508.