Agriculture Reference
In-Depth Information
Fig. 12.6
Schematic of a jet
pump
Jet
tube
Water
jet
pump in a jet pump is to produce the flow to the nozzle and maintain the combined
flow through the intake pipe beyond this point.
Jet pumps are self-priming, have no moving parts, and do not require lubrication.
Their efficiency is typically low (on average about 40%), and they provide low flows
at high pressure. Because of this characteristic, they are not suitable for large-scale
irrigation. However, they are frequently used for home-water supplies and irrigation
of lawns and gardens.
12.6.2.1 Features
A jet pump is a diffuser pump that is used to lift water from both shallow and deep
wells. During working, the output of the diffuser is split, and half to three-fourths
of the water is sent back down the well through the pressure pipe. At the end of the
pressure pipe, water is accelerated through a cone-shaped nozzle. The water goes
through a venturi in the suction pipe. The venturi has two parts: the venturi throat,
which is the pinched section of the suction tube; and above that is the venturi itself
which is the part where the tube widens and connects to the suction pipe. The venturi
speeds up the water causing a pressure drop which sucks in more water through the
intake at the very base of the unit. The water goes up the suction pipe and through
the impeller, most of it for recirculation around to the venturi.
General Specifications
Bore well size (mm)
Suction lift (m) Discharge head (m) Discharge (l/min)
Power (hp)
75-115
9-30
12-18
14-45
0.5-1.0
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