john smith writes:

Thirty years ago I worked for a company by the name of IRD Mechanalysis.
Their business was vibration detection, monitoring and analysis for
preventive maintenance of heavy machinery.

I remember them. We used it on pumps. Here "pump" mean 17-stage
centrifugal with a 800 HP motor that runs on 3-phase 4160vac.

As I recall, it took a fair amount of training to interpret
the results.


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