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I need help guys. I have a vertical pump. Motor sits on top. Pump has a column. Installed in a pit with impeller, casing in the pit. Just to give you an idea of the pump type.

Pump RPM is 1800, did bump test, got NF at 30 Hz. Vibrations meet specification when water level in pit is low. When water level is high, vibrations exceed specification. Predominant peak is at 1X. I will add more information as we discuss this further.

Any help will be greatly appreciated.

Tags: Vibration, Pump

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I always say each machine has its own dynamic characteristics. It is quite often that two identical machines act differently. One can be more resonance prone than the other one. The cause is often in the surroundings; base plate, supporting construction, bad welding etc...  However, from your runup graph I cannot see any high vibration levels at 3,3 mm/s. You can give some more details about the machine and about your acceptance criteria.

RM
Last edited by Registered Member

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