Alarm rationalization checklist.
A practical starting point for bringing ISA 18.2 discipline to your alarm system.
Eight steps
Inventory every configured alarm
List every alarm point currently configured, including ones nobody remembers the purpose of.
Document cause, consequence, corrective action
For each alarm: what causes it, what happens if ignored, and what the operator should do — the core of a Master Alarm Database (MADB) entry.
Assign priority by consequence, not by feeling
Priority should reflect the severity and time-to-respond of the consequence, not habit or the loudest complainer.
Identify and eliminate duplicates
Multiple alarms firing for the same underlying condition should be consolidated or linked via causal relationships.
Flag chattering and standing alarms
Any alarm that flickers rapidly or has been active for weeks needs engineering attention, not permanent tolerance.
Define suppression rules
Where safe, define process-state suppression (e.g., during startup/shutdown) so transitions don't flood the operator.
Set escalation and response-time targets
Define what should happen if a critical alarm goes unacknowledged within its time-to-respond window.
Establish a review cadence
Rationalization is not one-and-done — schedule periodic review as the process, equipment, or operating team changes.
See rationalization built into the system.
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