What are the common reasons for modifying the original impellers of centrifugal pumps?
Thread Content
Recently, I noticed that a pump was not working properly. Upon inspection, it was found that the impeller was worn out. With no other choice, I ordered an impeller of the same specifications from the supplier; it can be considered an original replacement part. However, after assembly and testing, it was found that the operational parameters still did not meet normal levels. So, the impeller was disassembled and then turned. Since I’m not familiar with this, I’d like to ask: if they are accessories of the same specification, why can’t they be interchanged?
Were the impellers of the same size when ordered? There might be problems elsewhere as well
Just find a supplier, right? If you process it to a smaller size, it will have the opposite effect. The manufacturer must resolve it.
It was obtained from the supplier according to the pump’s specifications; it’s the same
We also thought of turning to a supplier to solve the problem, but we have our own technical staff and believe we can handle it on our own
This post was last edited by CHANGBAISHI on 2018-8-11 09:27. Haha, that means someone is responsible for this matter. You just stand by and watch the outcome; there’s definitely going to be some excitement, and it can be considered a form of learning too: lol. Those who work for businesses are involved in interest-related relationships here. Remember, if you don’t have the ability to solve it, not participating is the best choice. :Lol oh, I forgot to ask – who will cover the processing costs? Who is responsible for damage caused during processing? Who is responsible for the delay in the project timeline? ;P
Which parameters are abnormal during operation? Is it flow head or vibration? Both flow rate and head will decrease after cutting, and poor dynamic balance of the impeller can cause vibration. I’m not sure what indicators you mean.
Which aspect is not reaching the normal value?
Cutting the impeller is generally done to reduce head, but too much cutting should not be done!
The flow rate Q, head H, and power N of the centrifugal pump, as well as the corresponding Q, H, N ratios before impeller modification, are each proportional to the first power, second power, and third power of the ratio of the impeller diameter after modification to the original impeller diameter. It can be seen that Q, H, and N all decrease after cutting!