4.12.2. Jet Pumps The jet pump is a combination of a centrifugal pump and a nozzle-venturi arrangement as shown in Fig. 4.15. The nozzle causes increased velocity and reduced pressure at point A. The lowered pressure at A draws additional water from the intake pipe and this water is added to the total volume of water flowing beyond A. The venturi tube helps in the recovery of pressure at B with minimum loss of head. Compared to centrifugal pumps, jet pumps are inefficient but have some advantageous features too. These are adaptable to small wells down to a 5 cm inside diameter. All moving parts of the jet pump are accessible at the ground surface. Their design is simple and results in low equipment and maintenance costs.
