Overpressure protection systems

All singular failure modes that can result in overpressure are considered. Generally, designing for unrelated, simulta¬neous causative failure events (i.e., "double jeopardy") is not necessary when the individual failure rates are very low and the failures are overt (i.e., self-revealing). If a failure is covert (i.e., non-revealing) and can persist undetected for a considerable period of time, such a failure is considered concurrently with other failures.