SIMPLE DESIGN & OPERATION. LOW MAINTENANCE. ROBUST CONSTRUCTION

Borehole pumps are submersible pumps installed in narrow holes called boreholes which are drilled to
extract water from water tables or aquifers deep below ground. These pumps are typically used in the
mining, construction, drinking water supply, dewatering, drainage, and irrigation sites. Centrifugal by
classification, borehole pumps are driven by fully submersible motor that is encapsulated. They are
available in single-stage or multistage configurations.

Submersible borehole pumps are more cost-efficient equipment compared with turbine pumps. They
are the better choice for large depths. Depending on the application, borehole pumps can be made from
aluminum, cast iron, bronze, chrome, multi-alloy bronze, nickel, steel, or plastic.

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Borehole Pump Design 

Borehole pumps are usually longer than other pumps with equivalent capacities. Their construction is extended to make up for the narrow space where they will be installed. The motor they use is generally filled with water or oil for bearing lubrication. 

There are single and multistage types of this pump. The single-stage borehole pumps have higher flows at medium heads. It also has a floating impeller design which allows the pump to handle 300g/m³ of sand where water is abstracted.

On the other hand, a multistage borehole pump cannot accommodate high amounts of sand and is used efficiently only in delivering lower flows at high pressure unless equipped with a floating impeller design.

Borehole Pump Operation 

Borehole pumps use the centrifugal working principle. The assembly consists of a sealed motor that is coupled with the pump before being submerged, and a suction grid. Like the conventional centrifugal pump, the borehole pump is driven by the motor. However, as it is already submerged, the priming process is already skipped. Water fills the suction and enters the pump into the rapidly rotating impeller. Water is rotated and forced to the tip of the impeller vanes by a centrifugal force. Fluid now falls to the volute, gradually decreasing its velocity but gaining pressure so it can be pumped out to the discharge and through the hose. For multi-stage designs, the fluid goes through multiple impellers and volutes to further increase water pressure before it exits the pump through the discharge port.

Borehole Pump Benefits

  • Self-sufficient as it is submerged, hence no need for priming.
  • Economic operation since they don’t require much energy to move fluid inside the pump.
  • Robust design and has high MTBF Minimal maintenance.
  • Mostly made from stainless steel or other metals that don’t corrode/rust.
  • Wide range of materials to suit different types of fluids and applications

Application

At All Pumps, we have a range of air-operated submersible pumps from the best manufacturers and brands trusted by industries worldwide. Connect with one of our pump experts and we will help you find compatible equipment for your system.

Brands we Sell, Stock & Service

Grundfos is a proud innovator of water technologies where its pumps and pump systems are constantly in demand. For almost eight decades of pioneering pump solutions, Grundfos is now present in many industries worldwide.

Grundfos submersible pumps feature advanced hydraulic designs that are perfect for borehole installations. The brand’s SP range of submersible borehole pumps specifically offers high efficiency and impressive resistance to abrasives. It is equipped with motor burnout protection making it one of the longest-lasting pumps in the market.

Entirely corrosion-resistant stainless-steel construction and easy to maintain, Grundfos submersible pumps are ideal for groundwater supply, irrigation, groundwater lowering, and pressure boosting applications.

Click Here to read more about our available Grundfos borehole pump range.

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