ABSTRACT
Axial-flow, mixed-flow and tubular pumps are the essential pump types used for water lifting under relatively low heads. Generally speaking, axial-flow pumps are used for head ranges from several metres to less than 10m and are applied mainly in the medium to large capacity range. Mixed-flow pumps are used in somewhat higher head ranges and mostly in the small/medium capacities. Both types may be constructed in vertical or horizontal designs and occasionally in the inclined arrangement (S-type), but the majority of these are vertical pumps. There are specific reasons for choosing one type or the other on grounds of preference to hydraulic performance and/or mechanical construction.
