Condition Monitoring Expert Tip #3 by Mobius Institute

This tip is sponsored by IMVAC (International Machine Vibration Analysis Conference)

How do you decide which assets should be monitored? How do you decide whether you can justify the use of more than one technology? Criticality analysis provides a means to prioritize which assets will be monitored and how much effort will be put in to collecting data and performing the analysis.

Criticality analysis considers several factors. It will consider the consequences of failure, for example health and safety, harm to the environment, downtime and production losses, availability of spares, cost of spares, etc. It will also consider the reliability of the asset; how likely is it to develop a fault condition. And it should also consider the detectability of the fault conditions. Therefore, an unreliable asset where failure would lead to dire consequences and where we currently cannot detect the onset of failure absolutely requires condition monitoring and can justify multiple technologies. At the other extreme, a reliable asset’s minimal consequences of failure may not require any condition monitoring; we may employ “run to failure”.
Criticality analysis enables you to make the best use of your limited resources.

Special thanks to Mobius Institute for allowing us to share this condition monitoring expert tip with you!

by Yolanda Lopez

It is critical (pun intended) that you have a criticality ranking for your equipment.  This will help you properly direct maintenance and reliability efforts.  It is difficult to have granularity on the actual role equipment plays if the criticality scale is small (1-10).  It is best to use a higher scale with categories that comprise the overall ranking.  For example use a 100-scale with 10 categories and each one being 0-10.

by Trent Phillips CRL CMRP - Novelis