Do you have class?Thursday, March 08, 2012
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Are alarm classes defined in your alarm philosophy document (APD) as required by the ISA-18.2 standard? The use of classes (classification) is a new alarm management concept for many. If your APD was created before June 2009, chances are alarm classes are not defined.
Alarm classification is a method for organizing alarms based on common characteristics and requirements (e.g., testing, training, management of change, reporting). Certainly an alarm that is identified as safeguard in a hazard and operability study (HAZOP), or as an independent protection layer (IPL) in a LOPA will have more stringent requirements for testing and operator training than the “average” process alarm. Classification helps to manage groups of alarms and ensure that their unique requirements are being…