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Maintenance activities are performed within three separate categories:
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Preventative Maintenance (PM) is scheduled, periodic maintenance to keep the
equipment in good working order
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Predictive Maintenance (PdM) is performed in response to diagnostic and analytical
results that help identify and support proactively correcting degradation in
equipment which could have lead to failure and consequent plant downtime
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Reactive Maintenance (RM) is urgent repair work required to restore functionality
of a failed piece of equipment, but requires advance preparation to ensure
availability of parts, labor and specialized tools necessary for all types of
critical component failure
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