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CONDITION BASED MAINTENANCE (CBM)

Condition-Based Maintenance is a maintenance strategy that monitors the actual condition of an equipment to decide what maintenance needs to be done. CBM dictates that maintenance should only be performed when certain indicators show sign of decreasing performance or upcoming failure.

The goal of condition-based maintenance is to spot upcoming failure so that maintenance can be proactively scheduled when it is actually needed.

Failure is a process not an event. It can be analyzed and early detected.

 

ROOT CAUSE ZONE

The proactive domain relates to vigilant monitoring and control of failure root causes (contamination, for instance). Corrections usually involve only minor adjustments (to remove the root causes) with no equipment damage.

INCIPIENT FAILURE ZONE

The onset of failure occurs at the beginning of the predictive domain. Ideally, it is detected early in the incipient zone. This requires high detection frequency and pin-drop detection technique (referring to condition monitoring techniques capable of detecting faint alarm signals). Once detected, the corrective action relates to root cause adjustments with only negligible equipment damage.

IMPENDING FAILURE ZONE

If too much time passes and / or the detection methods are insensitive, you will enter impending failure zone. The vast majority of predictive maintenance "saves" are in this zone. Both oil analysis and vibration analysis are excellent technologies for this zone. When performed with considerable skill, inspections are extremely effective as well.

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