43: Scope Issue

Node Scope Issue

Definition/Typical Issues

Was the scope of the condition-based maintenance work inappropriate?

Examples

Example 1

  • Each river water pump had four sets of bearings. However, the condition-based monitoring task only specified that two of the four bearings had to be checked for vibration. As a result, by the time the condition-based maintenance monitoring activity detected the impending failure, bearing failure was imminent, and an unscheduled shutdown was required to replace the bearings.

Example 2

  • Infrared inspection of electrical switchgear had been specified for all electrical cubicles 120V AC and higher. The process was very good at predicting failures of 480V AC and 4160V AC switchgear. However, the process was ineffective at predicting failure of the 120V AC equipment.

Typical Recommendations

  • Ensure that the condition-based maintenance activities address all potential failure modes.
  • Ensure that the condition-based maintenance activities are effective in predicting impending failures.

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