Dangerous Failures (or Unsafe Failures)

Definition(s)


Dangerous Failures (or Unsafe Failures)

Dangerous failures (or unsafe failures) are failures that have the potential to prevent the safety system from achieving its safety function when there is a true demand. A single dangerous failure is generally not sufficient to prevent a redundant safety system from performing its safety function (e.g. two dangerous 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