March 2021

Valves, Pumps and Turbomachinery

Optimizing failure data analysis

A critical objective of engineers who design an automatic protection system is to lower the false trip rate and to lower a key metric called average probability of failure on demand (PFDavg).

A critical objective of engineers who design an automatic protection system is to lower the false trip rate and to lower a key metric called average probability of failure on demand (PFDavg). The PFDavg metric represents the chance that the automatic protection will not work when needed. The false trip rate and PFDavg are based on several variables, including the failure rate of all devices used for each safety instrumented function (SIF). These devices are classified into three groups: The sensor assembly, which detects a dangerous condition The logic solver, which determines when to initiate the protection The final element, which does the protection work, and is often a remote actuat

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