A common occurrence is an alarm being driven by code that is no longer being utilized. A periodic review of alarm philosophy should be conducted by third-party or plant maintenance employees.
Have you ever reviewed the list of standing alarms in your plant? Do you see alarms that always seem to be cycling? Are there multiple alarms that have indicated an alarm state for an extended period of time? Have operators silenced or disabled the alarms that are constantly going off? I have found numerous power plants that have forced off or silenced alarms due to the repeated activation just so they can put more focus on the 300 other active alarms during normal plant operations. A review of the standing alarms often leaves you wondering which alarms the operator notices when overwhelmed with so many. So how do you make sure you have the right alarms in place?