For the same pump, when the speed is constant, change the impeller diameter, the performance can be cut the following law of conversion.
![impeller diameter and pump flow, head, shaft power have anything to do](http://www.www.qichebeibei.com/UploadFiles/2022-04/20224277805147144.gif)
Where: Q1, H1, Pa1 - that when the impeller flow diameter D1, head, shaft power;
Q2, H2, Pa2 - that when the impeller flow diameter D2, head, shaft power.