Why is the vibration harmonic mainly at the 7th order?
Thread Content
My home has a boiler feed pump; it stopped operating recently due to high vibration levels, and the vibration frequency measured was mainly at 7 times the fundamental frequency. The vibration displacement of the pump exceeds 300 UM before leaving the factory. The vibration velocity was not measured. What is the reason? Which sea friend can analyze it for me?
Has this phenomenon occurred before? Cavitation is likely to have occurred; it is recommended to carefully inspect the inlet pipeline and the first-stage impeller.
Didn’t they mention the location where it was measured? Is it a multi-stage pump? ? How many stages does the impeller have? Normally, there is a vibration at high frequencies; it is likely a problem with the bearings or blades ；