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What are the reasons for excessive vibration levels in shielded pumps?
Poor dynamic balance, worn sliding bearings, pump cavitation, pump operating outside its optimal operating range
Does the owner’s canned motor pump come with a TRG gauge? If you bring it, check what color the pointer display area is? As the foam moderator said, high vibrations, the pump operating outside its normal conditions due to being emptied, imbalance issues, and bearing wear are the main possible causes. The main issue is that if this pump operates for an excessive amount of time, it is recommended to have graphite or silicon carbide bearing spare parts ready, so as to carry out repairs at an appropriate time. I look forward to the original poster’s subsequent response to this post, along with corrective actions, to find out what exactly is causing the excessive vibration.
I work with equipment, not processes. The stress and motors you mentioned could also be reasons for excessive vibration. The problem is that you’ve provided too little specific information; I can only make some general guesses about common causes.
If there are changes in the process parameters, it is inevitable that the radial clearance will increase due to wear of the graphite sliding bearings after long-term operation: lol
Has the imported filter been checked? How long has this pump been running without maintenance?
Academic discussion, not real-world situation