How to choose a motor pump for domestic applications
Comparison of motor pumps
How to choose a motor pump
Residents are now taking it for granted that running water will be available when they open any tap. Motor pumps play a critical role in making this happen and therefore have become a must-have item in households and communities. A gated community can have tens of motor pumps. This write up gives a brief overview on the criteria to select and evaluate motor pumps.
There exist various kinds of pumps such as centrifugal, submersible, hydraulic pressure pumps, booster pumps, sewage and waste water treatment pumps. The user has to choose wisely, among these pumps depending on their requirement. As the pumps are dealing with power consumption, have to choose the pumps depending on efficiency, head range, discharge rate of pumps, depth of bore well or sump.
Several factors must be considered to select the proper pump:
- How many gallons per minute(discharge rate) are we going to pump?
- How high is the pump above water?
- How high(Head range) must the water be pushed after it leaves the pump?
- The total length of pipe to be used?
- What power supply should be used (single phase or 3-phase)?
Power supply: The power supply required for motor pumps is single phase or three phases. The depth of the bore is a criterion on deciding whether to choose single phase or three phase power supply for motor pumps. A single phase power supply is sufficient for a depth of up to 500 ft., beyond the depth of 500 ft., a 3 phase power supply is recommended for the efficient working of the motor pump. This criterion may not be suitable all the time, in some cases, the bore depth may be 200 ft., but the water may be needed to lift above 20 floor height, in those cases, a 3- phase power supply is needed for the motor pump.
Selection criteria of Pumps:
The pump selection depends on various factors like:
- Head range: This is a measure of upto what height the water has to be lifted. Higher the head range higher the capacity of motor pump is required,
- Discharge: Discharge is the rate at which the water should be pumped. It is usually measured as litres per second, litres per minute or litres per hour.
- Depth of bore well.
For example if an 0.5 HP motor with discharge rate of 200 litres per hour takes 2 hours to lift the water, then an 1 HP pump with higher discharge rate 400 litres per hour can complete the task in less than 1 hour.
In our research we have found that for a G+1 building, people prefer 0.5 HP motor pumps, but these motors have very less efficiency 10 to 17 % only, which consumes high amount of power. So up to a 2 stored building choose 1 HP motor pump, which has good efficiency of 45-55%.
For high rise buildings prefer submersible or hydraulic pressure pumps. Booster pumps are used in high rise buildings especially to supply water in bath rooms with good pressure.
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