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A guide to selecting Submersible Pumps

Houses and facilities which depend on ground water system require effective and efficient pumping systems and equipments. One of the pumping device most commonly used for pumping out water from underground is a submersible pump.

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To ensure satisfactory performance of submersible pumps, it is important that the pump set is properly selected, installed and maintained. Proper maintenance is not just about rectification or repairs or replacement of worn out parts, but it starts with the right equipment selection.

Equally important is proper installation. Negligence of fundamental precautions during installation may result in premature failure of the equipment. Finally, the life and performance of pumps depend on good maintenance.

How to select a pump set
Proper selection of submersible pump set ensures trouble free working for a longer duration. The following criteria have to be considered during its selection.

a) Bore well size
As submersible pump sets are normally installed in bore wells, the diameter of the bore well is the main factor to be considered in selecting the size of the pump set. The ideal size of bore well is 6 to 7 inch diameter. Then the pump can be inserted to the bottom of the bore well and fixed easily.

b) Discharge
The yield of the bore well is an important criterion for pump selection. The rated discharge of the pump will be only about 80% of the officially stated yield of the bore well. The discharge for 0.5 hp is approximately 18.9 litres per minute. You don't need to struggle with calculations, just settle on an approximation from the list provided by the pump dealer and select the quantity of water you need to fill your over head tank. Almost all manufactures provide the same specification based on standard parameters followed in the design of submersible pumps.

Total Head:
Total head means the flow measured in cubic meter per hour. It also denotes the pressure at which the liquid is pumped out at the discharge outlet point. It is important to work out the Total Head variation in water level and the frictional losses in bends, reducers, non return valves, column pipe and delivery pipe. Also, it depends on the height of the discharge outlet of the pipe, because the height is directly proportional to the pressure of liquid at varying positions.