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Submersible borehole pumps are an excellent solution for pumping clean groundwater regardless of the water source (from boreholes, wells, collection tanks, etc.). A suitably chosen deep well pump will ensure you have a constant water supply while maintaining low costs and high pump reliability. However, it is important to choose a pump that matches the conditions of your borehole or well.
A submersible water pump is designed for long-term submersion, ensuring easy installation and almost maintenance-free operation for many years. We recommend choosing a pump that has built-in protective features, such as the Grundfos submersible borehole pump. The pump will take care of everything necessary for you, and there is no need to purchase additional accessories. Even the best submersible borehole pump can have its lifespan extended by ensuring excellent conditions.
Submersible pumps are designed for pumping clean water. Generally, the more sandy material and other abrasive substances present in the water, the sooner the pump will wear out, so it is important to clean new or contaminated boreholes. Every borehole pump can operate with a certain amount of solid particles, and this value is specified by the manufacturer.
Therefore, you should not forget to regularly check the borehole and ideally clean it every 5 years. This will not only ensure the smooth operation of the submersible pump but also the cleanliness of the pumped water.
To achieve the highest quality water from your borehole, we recommend installing a domestic cold water filter, which also protects your appliances.
A submersible borehole pump operates submerged below the dynamic water level of the borehole, and it is essential to ensure that the water level does not drop below the pump level. The pump should be suspended sufficiently deep in the borehole. In case of excessive borehole depletion, it may lead to dry running of the submersible pump, causing damage.
The solution is to acquire a level monitoring probe or a pump that already has built-in dry run protection (such as Grundfos SQ and SQE submersible borehole pumps) and can stop pumping in time in case of water shortage in the borehole.
The correct installation depth of a submersible borehole pump is important not only as a prevention against dry running but also as protection against damage from excessive water pressure. When placed at a greater submersion depth, the water column exerts higher pressure on the submersible pump, affecting the pump's seal. If the borehole pump is submerged deeper than it is designed for, it may lead to damage to the pump's internal parts due to water seepage.
In case of water shortage in the borehole, it is possible that the borehole pump is not installed at the correct depth. Before lowering the pump deeper into the borehole, first verify the correct submersion depth for your pump. The problem with insufficient water quantity may be caused by low borehole yield, so it is necessary to find the cause first.
Cooling of the deep well pump is another reason why it is important to pay attention to the amount of water in the borehole. Sufficient water flow around the pump (at least at a speed of 0.15 m/s) ensures cooling of borehole pumps to prevent motor overheating. The optimal space between the pump casing and the borehole wall is at least 10 mm and also serves as protection against potential mechanical damage to the submersible pump.
If it is not possible to ensure the necessary cooling of the borehole pump by water flow, the same effect can be achieved by installing a cooling jacket.
Borehole pumps can operate within a certain voltage range. However, the voltage in the electrical network is not constant and fluctuates, which can result in frequent pump shutdowns and motor damage.
The Grundfos SQ and SQE submersible borehole pump is equipped with a frequency converter unit and operates over a wide voltage range, ensuring stable water supply even in case of voltage fluctuations in the electrical network.
Frequent starting and stopping of the submersible borehole pump, whether due to unsuitable voltage or water shortage, places excessive stress on the motor and pump contactors, significantly shortening the pump's lifespan. For each type of borehole pump, a recommended maximum number of starts is specified, which should not be exceeded to protect the pump. On the other hand, it is not advisable to leave the borehole pump turned off for too long. The motor of the submersible pump needs to be started at least once a year to prevent potential seizing.
Insufficient cooling of borehole pumps, voltage fluctuations in the electrical network, frequent starting and stopping of the submersible pump, and long-term operation of the pump at maximum flow lead to high electrical and mechanical load, resulting in higher wear and shorter lifespan. For smooth operation of borehole pumps, it is important to minimize all these undesirable factors. The pump must be selected to operate as close as possible to the point of best (peak) efficiency, while it should operate at maximum flow only minimally.
If you are considering purchasing a submersible water pump, choose a pump with built-in features that automatically contribute to lower electrical and mechanical load. It will reward you with longer lifespan and lower operating costs.
You can use a submersible water pump all year round if the conditions for its operation are ensured. However, if the water source where the pump is installed is not used during the winter, it is necessary to winterize the submersible pump along with winterizing the borehole or well.
Submersible borehole pumps are not frost-resistant, so for winterizing, disconnect the pump from electricity, remove it from the borehole/well, drain the water from it, and store it in a safe place where it will not freeze. Carefully winterize the water source itself to prevent contamination from flash floods and melting snow, even if it serves only as a utility water source. A larger amount of sandy material and other abrasive substances in contaminated water could damage the pump upon restarting. If you are unsure about the water quality, have the borehole cleaned preventively before further pumping.
Regular maintenance of the submersible pump is an excellent way to ensure that your pump remains in top condition. This includes replacing worn parts (especially seals). The interval may vary depending on the flow rate, presence of solid particles, and borehole conditions, but generally, it is recommended to service the submersible pump every 3 years.
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