What to consider in selecting your borehole pump
Interrupted water supply, poor water pressure, unnecessary energy consumption and excessive pump maintenance are issues that can all be expected if the wrong borehole water pump is selected for your installation.
One basic thing about borehole pumps that you are probably aware of is that borehole pumps are a thin, vertical pump that is immersed into a drilled hole/well in the ground to extract water. There are standard feature applicable to all submersible borehole water pumps by nature of their functionality. For example being made from corrosion resistant materials such as stainless steel to prevent abrasion caused by the earth and mineral deposits. There are also other ways in which they vary. .
1. Borehole size
Typically, you will find that most boreholes for private water supply vary in diameter from about 10cm to 15cm in diameter. larger or smaller boreholes are drilled. A hole that was originally big, may end up requiring a smaller pump in scenarios where borehole has reduced in size due to residue deposits that have built up over time.
2. Immersion depth
How deep a borehole is drilled into the ground depends upon the depth of the ground water level that it needs to reach. Different models of submersible borehole water pumps have different maximum immersion depths, so it is vital that the selected pump is able to efficiently operate at the water level in question.
3. Flow rate
The required flow rate of a borehole pump (this being the speed at which the water is moved) is directly affected by the demand on the water supply and what it is being used for. For example, a borehole supplying water for irrigation to will require much higher flow than one that is simply used for a single household.
By nature, borehole water pumps typically offer high pressures due to having to pump long distances vertically. However, it does need to be ensured that the selected model is able to generate the pressure required to get the water supply to where it needs to be. This depends upon the depth of the borehole to ground level and then the distance from the ground level to the final end point e.g. where the water tank is sited. The further the distance, the higher the pressure requirements of the borehole pump to prevent the water from trickling out. When it comes to both flow and pressure, it is common for a margin of safety to be added to ensure that once installed the pump does not fall short. Oversizing however is one of the largest causes of pump inefficiency resulting in unnecessary energy consumption and electricity costs, so we recommend being as accurate as you can when determining duty requirements.
5.Sand handling capabilities
Depending upon the location of the water source in question, there may be more sand content in the water than others. When this is the case, the borehole pump needs to be able to handle the sand without clogging or abrasion. Models with self-cleaning floating impellers are typically able to pump more g/m3 than others and should be selected.
6. Borehole pump control features
By implementing borehole pump controllers features alongside the pump, it can help private water supply feel as close as possible to getting water off the mains:
- Starter box – on/off switch
- Variable speed drive – Adjust pumps speed to the current demand on the water supply
- Overload protection – Stops pump running when experiencing voltage overload to prevent pump damage.
- Dry run protection – Stops pump running when there is a low water level to prevent burn out and pump damage.
If you’re still not sure what you need, then that’s where we come in! Simply WhatsApp us on +44 77634 98401 and our team at KumbaDirect will help you choose a pump or pump package suitable for your needs.
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