The impact of adding or removing impellers on multi-stage pumps
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Does anyone know what the effects are on the pump when one impeller is removed? Specifically, does it affect the axial force? Which stage would be the best to remove an impeller from – the first stage or the last stage?
First, look at the arrangement of the impellers; second, if one stage of impeller is to be removed, the last stage should be removed.
The axial force decreases, the head drops, and the flow rate reduces (the impact is minimal on pumps with high flow rates, but it is more significant for pumps with low flow rates). The primary impeller cannot be removed. Cancel level 1 in the middle position.
Mainly, the head is reduced, and then the balance and surge quantities are recalibrated
The first and last stages cannot be canceled, but the middle ones can.
The question now is which level should be canceled. Are there any successful cases of such modifications?
This post was last edited by chenmin-mg on 2015-11-29 00:06. Since the original poster is looking for specific advice, at least everyone needs to know how many stages your pump has Leave the first and last levels unchanged; if there are many levels, generally keep the first three levels and the last level unchanged. I have here an example of a stage 4 impeller with the third stage removed. We’ve encountered the reciprocal of 2.3 at many different levels as well. I forgot to mention that this is in a series configuration. For the self-balancing impeller design with impellers arranged back-to-back, changes in axial forces can affect the design parameters, so it’s advisable to consult the manufacturer for guidance.
For an 8-stage impeller, if two stages are removed, which episodes would be appropriate to remove them from?