Agriculture Reference
In-Depth Information
Fig. 12.1 Schematic of a
submersible turbine pump
very efficient and are used primarily for larger pump applications. They are typically
the type of pumps used on municipal water system wells, irrigation systems.
12.5.1.1 Deep-Well Turbine Pumps
Under this category are grouped all types of pumps that are suspended by the dis-
charge column within which the drive shaft is located. The name, deep-well turbine
pump, is applied only to pumps operating on the centrifugal principle and having
diffuser vanes within the bowl or case. They can be single-stage or multi-staged
for higher pressure applications. Pump bowls which contain impellers and diffusers
are located below the water surface, and they should be submerged under pumping
conditions. The drive shaft is located in the center of a discharge pipe and it can be
either oil or water lubricated.
Features of Turbine Pump
These pumps are used in tube wells or in open wells where the water level is below
the practical suction limit of centrifugal pump. The pump unit remains submerged
in water where as the prime mover (motor or engine) is kept above the ground
level. The pump unit is connected to the motor with the help of long vertical shaft
supported on bearings, which may be water or oil lubricated. Although the turbine
pump also operates on centrifugal principle, it differs from volute type as stationary
guide vanes guide upward the water thrown by the impeller to the periphery. The
gradual enlarging vanes guide the water to the casing, thus converting kinetic energy
into potential energy. Therefore, the turbine pump generates heads several times that
of a volute pump. Turbine pumps are most effective for tube wells, and applications
requiring high heads and discharge. A well-maintained pump provides trouble free
service for several years. These pumps are available in wide range of models with
various flow capabilities and head levels.
A generalized specification of this type of pump is given below:
Diameter of tube well (mm)
Discharge (l/min)
Head per stage (m)
Speed (rpm)
150-900
150-62,000
1.2-49.0
960-2,880
 
 
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