Q. Axial flow pumps for large flows and low heads?

It is well known that axial flow pumps are the most suitable for providing large flows and low heads. Reason behind this is closely related to configuration and the design of pumps. In axial flow pumps, size of inlet diameter is greater than impeller diameter. For low flow condition the velocity is comparatively small and this raises the chances of occurrence of separation that brings about extra head losses and vibration. Quite the opposite, if discharge is large enough the problem of separation is minimized.