Introducing a deep submersible pump

Do you suffer from drought and water shortages? A well and a submersible pump will help

Due to high temperatures and increasingly frequent droughts, many households face water shortages. We can face this new phenomenon, for example, by acquiring a drilled well that will provide us with enough water to irrigate the garden or run the household. But how do you get water out of a well? Submersible pumps into the well will be used for this purpose. Among the current favorites are so-called deep water pumps.

In addition to unpleasant heat, drought also has an impact on groundwater status. While in the last century only a few meters of digging well was often enough to supply water, today we have to drill wells with a depth of normally over 20 meters for water. In order to supply water, we need pumps with deeper draught and, thanks to the current use in the garden and at home, more powerful and sophisticated pumps. 

What is a submersible pump?

A submersible pump is actually a colloquial designation for a submersible pump that we use to pump water from great depths. However, because it is a general designation, nowhere is it specified exactly what the pump is deep and what it is not. In practice, any submersible pumps outside surface pumps (suction heights less than 8 meters) are often referred to, and this misleading designation may then do more harm than good to the well owner at greater depths.

 Who is a submersible pump suitable for?

Quality submersible pumps are made of highly resistant materials such as stainless steel and are adapted for long-term immersion and resistance to the pressure of the water column above it. For example, the AD Pump is suitable for pumping water from deep boreholes, up to a depth of 250 m using irrigation and for supplying drinking water to cottages or family houses. We do not normally drill into these depths, but the data guarantees a professional design of the pump, thanks to which the owner can rely on the fact that at greater depths the pump 100% withstands high pressure and will not be damaged.

What are the risks of poor pump selection

Differences in pump prices are relatively large, but mostly correspond to differences in performance and quality. Every garden
and household has specific conditions, hence a number of pump variants, which combine different parameters to make the right choice for everyone. Forget the classic equation in terms of pumps that the higher the performance, the better the product. Incorrect selection will bring you discomfort in the best case, in the worst case you can shut the pump down very quickly. When buying cheaper hobby pumps, you will then be forced to invest in a new pump, as repairing a damaged pump will either not pay off or the dealer does not provide service. Do not underestimate the availability of pump service, which is a matter of course for professional dealers.

Why is there no water running

For most of you, at least once in your life, you stayed in the shower with shampoo on your head and the water stopped running. What could the reason have been? If we select a pump with insufficient power, it will not be able to pump the required amount of water.  The performance of the pump in this case could “take” a family member who decided to wash dishes before your shower. The opposite may be an unnecessarily oversized pump with significantly higher performance. In this case, for example, there may be situations where water is quickly pumped out of the borehole and it may take some time to allow it to drain. In addition, the pump will be unnecessarily expensive and will work with low efficiency, which will result in higher energy consumption costs and reduced pump life.  Before purchasing, always find out the yield of your borehole, i.e. how long it will take to replenish the water in the borehole.

How to read parameters

Most commonly, only data determining the maximum flow and displacement values are given. These are indicative guides, however, we should choose the pump so that the required flow is around the optimal operating point of the pump, which is determined by the combination of flow and displacement. How to understand individual parameters:

Optimum flow rate

The pump flow rate indicates how much the pump can pump fluids over a given period of time, most often you will encounter m3/hour or l/min. Manufacturers indicate the maximum flow rate, that is, the value that can be achieved at zero head. In normal operation, due to head and pressure losses, the pump flow rate will be lower. The higher the head, the lower the flow rate and vice versa. For garden irrigation, you can do with flows up to 2 m3 / hour, for the supply of drinking water to the household using a home waterworks or with the simultaneous use of water in the house and garden, the output should be over 3 m³ / hour with sufficient pressure. In case you are looking for a solution for an irrigation system with several outlets, high pump performance is a must to ensure sufficient pressure and water supply at all outlets at the same time.

Conveying height

After determining the flow, it is necessary to take into account from what depth and distance you will pump the water and not forget about the length of the supply pipe. This parameter represents the conveying height or pump head . Add up all the heights from the water source to the outlet and add a loss of 1 m in height for every 10 m of pipe length. If you want to supply water to a family house, it is necessary to add the required pressure – 1 bar = 10 meters of altitude. As a rule, one model type of pump offers several variants, which often differ in the required head.

Fig. Example of hydraulic curve of pumps Pump AD. Dealer is looking for a pump with such a curve on which your desired power is located at a given head.

Maximum immersion depth

Cheaper pumps are often limited by a depth of immersion of max. 20 m. With some pumps you will not even find this value. The deeper the drilled well, the more important this parameter is. A deep well pump with a maximum immersion depth of 20 meters will not prove you much use with a borehole with a depth of 30 meters.

Power and input

You will certainly be interested in the energy consumption for your chosen pump. A high-quality deep-sea pump with a flow rate of over 3 m3/h and an output of 0.37 kW can be purchased at the same or lower prices as a pump with an output of more than 1 kW.

Borehole diameter and proportion of impurities

The width of your well is a given, so adjust the size of the pump. The most common are 3" and 4" pumps for boreholes with a diameter of 100 mm or more. Similarly, models are available for wells with a higher content of sand in the water, etc.  When choosing the size of the pump, it is also necessary to ensure sufficient space in the borehole in the so-called ring and prevent clogging of the borehole with rhinestone or other dirt.