The vibration levels of the motor and the pump are not the same.
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During testing, it was found that the horizontal vibration of the motor was above the acceptable level, while the vertical vibration was within normal limits. Meanwhile, the horizontal vibration of the pump was normal, but its vertical vibration was above the acceptable level. What could be the causes of this?
The radial, axial readings and the distance between the two couplings for the motor and water pump calibration are within normal ranges; if they are within normal limits, there may be a problem with the water pump shaft.
Generally, for vibration issues, alignment must be adjusted; when large motors are in operation, there is a backlash, so care should be taken during adjustment.
1. Check the settlement of the foundation, as well as the grouting of the anchor bolts and their holes. 2. During operation, the foundation settlement of the motor is greater than that of the pump, and the anchor bolts are not tightened properly, etc
What’s said above is correct; the pump experiences significant horizontal vibration. Check the alignment again
The alignment check has been done, and there are no issues.
Disconnect the coupling and rotate the motor manually to check if there are any issues with the motor base, then examine the alignment. Note by how much the vibration of the pump in the vertical direction is greater than that in the horizontal direction; check the pump foundation before proceeding. Actually, it would be much simpler if you could collect the spectrum.