In the specification table of this centrifugal pump, why is the head a fixed value at a certain speed and different flow rates?
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This post was last edited by jmdc on 2018-12-24 13:24. The following screenshot is a specification table on the official website of a pump factory. In the centrifugal pump specification table, at a certain speed and different flow rates, why are the head, efficiency and shaft power all constant values?
My understanding is: “"Maximum power" "Highest efficiency" "Maximum power".............~
Does the shaft power give the maximum shaft power? Each pump corresponds to multiple performance curves, and the actual power will certainly vary accordingly.
There is an obvious error in the diagram. When the flow rate changes, the head remains unchanged and the efficiency remains unchanged. The lift and efficiency above are corresponding to the flow rate in the middle.
This post was last edited by Ah Le on 2018-12-25 16:04 Generally speaking, the first model refers to the model of the pump casing. Each model can actually accommodate impellers of many diameters, so its corresponding performance curve is more than one. The three sets of flow heads given in the table correspond to different impeller diameters. Just to give us an indication, the working range of this pump can probably cover this range. In fact, the specific selection depends on the performance curve in detail. And the flow rate when we select does not need to correspond one-to-one with the flow rate given in the table. The table only shows a few examples of pump impeller diameters. In theory, the size can be customized according to needs. The values given in the table are generally the maximum and minimum intermediate values. However, it should be problematic to directly give the impeller diameter and efficiency here.
Can I tell you that the person who compiled this sample was lazy?