you did not recognize and thing wrong in vibration measurements before that? no noise ? no remarks in any inspection on this equipment? please if you have any information, share it with us.
Turbomolecular pumps are used mostly in scientific and semiconductor processes for high-vacuum creation. They are usually supported by mag-lev bearings and any failures, i.e. particulate ingestion, loss of power to the bearings, etc are usually quite catastrophic. Using mag-lev bearings makes vibration monitoring a non-productive task. Visual inspections will reveal very little, and because of the nature of trying to get a system back to high-vacuum once exposed to water vapor in the atmosphere, opening up the system for inspection is usually discouraged. These pumps are multi-stage and most closely resemble small gas turbines with alternating rows of rotating and fixed blades.
Wow, this is a disastrous amount of damage. What was the cause of bearing failure? If you don't mind what is the rotating mass, and what is the power for the unit?