About "impeller cutting" in centrifugal pump models”
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Regarding the "impeller cutting" in the centrifugal pump model, adding A after the nominal diameter of the impeller in the model indicates that the impeller has been cut for the first time. For example, does the model 160mm in the picture below refer to the diameter before cutting or the diameter after cutting? If it is the diameter before cutting, then why not just write the diameter after cutting? Why use letters to indicate the number of cuts?
There are two situations. First, for example, a pump model XXXX-160 has a lift of 32, a flow of 100, and a motor of 15kW. According to the needs of the expanded model, we cut it once to make it a lift of 28 and a flow of 88. At this time, except for cutting the impeller, the pump body is still the original pump body and the motor becomes 11kW. This is equivalent to redesigning a new model, namely XXXX-160A, but most of the structural components have not changed. In the same way, if we want to design a XXXX-160B with a lift of 24 and a flow of 80, then we only need to cut the impeller and use it with a smaller (7.5kW) motor (the motor bracket needs to be redesigned). In general, cutting the impeller multiple times is used to expand and enrich the model. Second, in actual use, if you feel that the flow head is too large, you can also cut it to make it smaller to suit the actual application.
After leaving the factory, it has been used by the user. I am afraid that there is no condition to cut it again. Do I need to return it to the factory for cutting?
This is generally not done, right? Valve is used to adjust the flow and pressure, unless cutting the impeller can increase the flow and lift?
If the maximum impeller diameter of 169 is enough when selecting the model, but the increase in lift needs to be considered, this model cannot be selected, so you have to choose 200, and then the impeller diameter is cut to 169. What to do in this situation. Write down the diameter of the impeller. Do you know what model the pump is? Consider the problem comprehensively.