Centrifugal pumps are prone to producing abnormal noises
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Centrifugal pump bearings often make abnormal noises; even after the bearings are replaced, such abnormal noises reappear after a short while
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What brand of bearings are they, and what is the quality of these bearings? Are the installation methods and clearance values appropriate?
What’s the bearing temperature? Is it rising? Is it over 70 degrees Celsius? Is the bearing grease being added as required, and what is the quality of this grease? ； Also, when aligning the shaft couplings, consider issues such as whether the angles are properly adjusted!
How is the quality of the lubricating oil? Is the alignment within the standard value? Coupling type?
There are too few criteria and too many possibilities; it’s difficult to arrive at a definite answer for such problems