Reasons for vibration in centrifugal pumps
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One of our company’s centrifugal pumps, which has supports at both ends, shows bearing levels that are around 6.0 in both the horizontal and vertical directions. Spectral analysis reveals a high level of the third harmonic, while other frequencies are normal. What could be the cause?
May I ask what device is used for testing? It looks quite advanced; I’d like to get one
Hehe, seeing these test results of yours reminds me of those old days. It was the case at a certain steel plant: there were four dust removal fans and four gas fans, and only one of them met the requirements during testing. During this period, several teams of experts were brought in; they brought such equipment, and it cost a lot of money to acquire it from abroad. They would use a probe to make various measurements, generate graphs, and then explain all kinds of data to you. After it happened so many times, I got annoyed too, so I said to them: What I want is to get to the root of the problem. Can telling me this eliminate vibrations? In the end, it was necessary to use our own makeshift methods: lifting the equipment again, leveling the shims, and performing secondary grouting, which solved the problem. You might as well give it a try; it could work: lol
This can only assist the analytical instruments by allowing the analysis to be more targeted; however, identifying the cause of a problem and solving it are two different things. It’s similar to how a doctor uses a stethoscope to diagnose patients – to determine what illness exists, further examinations or the doctor’s experience are needed
The textbook solution, haha.
Based on experience, it could be the impeller, or there might be issues with the fit. Too little information is provided.
There are three reasons for your question. One is operation under partial load conditions. Second, the pipeline installation lacks shock absorption; third, there is a problem with concentricity.
I’d like to know more about this as well; I welcome experts to share their insights
There are three reasons for this vibration: one is that the pump is not installed level, and the coupling alignment is poor. Second, the rotor’s dynamic balance is poor. Third is the vibration caused by cavitation due to insufficient inlet flow.