The centrifugal pump vibrates heavily; let’s analyze it together
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Cantilever centrifugal pump, speed 2950; horizontal vibration on the drive side of the bearing housing ranges from 3 to 5, with fluctuations in between; the maximum vibration on the non-drive side is 3.8. After maintenance, including the replacement of the shaft and bearings, the vibration level remained the same. A frequency reading of 2X indicates misalignment – is that the case? After alignment, the value was within the acceptable range
After startup, the vibration level is high; shut it down and check to see if everything is aligned and if there have been any changes.
Does the pump rotate at 2950 revolutions or 1475 revolutions?
For the second harmonic, the end with misalignment is larger
“What does a “cantilever centrifugal pump” look like? Can you send me a live video? Haven’t seen it, thanks! :) Was your device newly installed or did the problem start later?
What kind of vibration measurement equipment do you use?
We all use vibration meters; LZ’s looks really high-end. .
Since it’s a second harmonic, the likelihood of misalignment is higher. P – The instrument used by the original poster is good, which shows that the organization attaches importance to this aspect
2x isn’t necessarily out of alignment; it could be due to underlying issues or pipe resonance or something like that
Excluding issues related to coupling alignment and bearings, this problem can be addressed from three aspects: 1) Check whether the pipes and foundation are connected rigidly, as resonance can occur in such cases; 2) Determine whether the operating conditions deviate from the specifications indicated on the nameplate – either too high or too low flow rates can cause vibrations; 3) Check the dynamic balance of the rotor, focusing on the impeller, and it is best to conduct this check together with the shaft as well.