The flow and head of submersible water well pump
Since a centrifugal pump has no fixed volume (as indicated above) at a fixed inlet size and casing, increasing the diameter of the impeller or the rotational speed will lead to increased head and increased flow rate.
A centrifugal pump can have a large capacity with a small footprint compared with a reciprocating pump. Of course, increased capacity will consume more energy. Capacity is proportional to impeller speed and diameter. Larger impeller diameter (higher exit velocity) (see Figure 3) and/or faster rotation speed will increase the head due to conversion of velocity to head.
The pump head should be close to the actual needs, if the head is too low, the actual use of head higher than the pump head, this will cause the flow down, pump efficiency decreases. Axial force increases, thrust premature wear. Conversely, if the pump head is too high, the actual head down.
