Pump head, impeller diameter, motor speed, there is no relationship between the relationship?
I'll give you a common formula, for example, straight tapered suction type (Dalian Suhl Shou ZA/ZE) the formula can be simplified as H=U2*U2/2g, where U2 is the outside diameter of the impeller circumferential velocity, which U2= D2 n *D2*n/60, the outer diameter of the impeller, speed is n.
The calculated formula of impeller diameter is about the diameter estimation theory, and the actual difference is not too much, it is best to estimate you according to choose how much about the outside diameter of the impeller pump performance curve, because many pumps are readily available, now rarely need you to go to the real sense of design.
Of course it does matter. Pump impeller theoretical diameter is calculated according to the head and motor speed. The theoretical lift of the pump is only concerned with the speed of the medium, H= (U2*Vu2-U1Vu1) /g, which is very difficult to understand here
