In theory, everything will work as planned. It's not until a system is tested that manufacturers can be certain their processes are sound. Even better, an unexpected "test" to the system will expose all chinks in the process chain.
Enter Rocky Raccoon. According to Industry Safety And Security Source, a raccoon found its way into electrical equipment at the Delaware City, Del., refinery knocking a number of units offline, causing a large flaring incident in early December.