Safe Failures or Spurious Trip Failures

Definition(s)


Safe Failures or Spurious Trip Failures

Safe failures (spurious trip failures) are failures that have the potential to trigger the safety function when it is not needed. A single safe failure is generally not sufficient to actually trip unexpectedly a redundant safety system (e.g. 2 safe failures are needed for a 2-out-of-3 voting system).

Source: API STD 689, Collection and Exchange of Reliability and Maintenance Data for Equipment, First Edition, July 2007. Global Standards