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Is a submersible pump suitable for a ring well?

This is one of the frequent questions we hear in our company from installers choosing a solution for a specific water intake. Briefly: yes, it is possible to install a submersible pump in a ring well, but this comes with a few unexpected difficulties. In practice, however, it is often a much better choice submersible pump with float switch. Below we explain when and which option makes sense and how to approach the selection reliably.

Ring well and deep well – key differences

Circle well, also called a dug well, is a classic well made of concrete circles with an internal diameter of usually 80, 100 or 120 cm. The depth of the well rarely exceeds 10–15 m, and its resources come from the first aquifer. In this approach, the water table fluctuates significantly throughout the year - higher in spring and lowest in mid-summer.

Deep well (i.e., drilled well) is a narrow borehole, 4-6 inches in diameter, reaching layers below 30 and often over 60-100 m. A drilled well is stable in terms of performance, but requires dedicated deep well pumps with a slim, cylindrical structure.

From the point of view of equipment selection, this difference is fundamental: submersible pumps are designed to work in a narrow pipe, where water flows around the body and cools the submersible engine. In a wide concrete circle, these conditions still need to be created.

Can a submersible pump work in a ring well?

Yes – on one condition. Installing a submersible pump in a ring well requires application casing pipe (with a diameter selected according to the diameter of the submersible pump - typically 4" or 6"), along which a cold stream of water will flow. Without this pipe, the submersible engine will not be adequately cooled and its service life will decrease significantly - in some cases even up to several months.

When deciding to install a submersible pump in this way, the installer must also take care of:

stable mounting pumps vertically, paying particular attention to the safety of the power cable;
maintaining a minimum distance from the bottom of the well (usually 50–100 cm) so that the pump does not suck in the sediment;
filters and protection against abrasive media – sand is found more often in dug wells than in drilled holes. The strainer significantly extends the life of the pumps in such conditions. On the market and in our offer there are also pumps with increased resistance to abrasive media, which will fulfill their role well in such situations;
protection against dry running – level probe or pressure switch with a safety function, because the water level in the circles may drop faster than in the well.

Purchasing a submersible pump for a ring well makes sense if the well depth is large (over 8-10 m), the required water lifting height exceeds 30-40 m or you need to ensure a large water flow at constant pressure. In other cases purchasing a submersible pump for such an intake can be complicated to install and expensive – both in purchase and operation.

Ring well requirements – what to check before choosing a pump

A ring well equipped with an incorrectly selected pump may quickly fail. Therefore, before choosing the right pump, you should collect specific technical data that will help you choose the right tool. When making this decision, you should take into account information such as:

total depth of the well – from the cover to the bottom of the circle;
static water mirror – measured after min. 2 hours without consumption;
dynamic water mirror – measurement with continuous pumping of full capacity (significant information for protecting the installation against dry running);
inner diameter rings (important if the installation of a casing pipe is planned);
water quality – presence of sand, silt, turbidity;
home demand – usually 1.5–3.0 m³/h for a single-family house with a garden. To calculate the average demand for your home, you can use: our calculator.

The ring well also requires regular maintenance - disinfection once a year, checking the tightness of the rings and cover and the patency of the discharge pipeline. Equipping it with efficient automation (pressure switch, expansion vessel, dry-running probe) makes it operate virtually maintenance-free. Equipping such an installation with a pre-filter and a non-return valve ensures even longer operation without service intervention. Each well-prepared ring well equipped with a set of accessories is ready for various types of pumps - submersible, deep-well with a casing pipe or surface suction pumps.

Why submersible pump with float switch is this a better choice?

When a company is asked to recommend a suitable pump for a ring well - as a manufacturer of deep well pumps and well equipment - in the vast majority of cases we recommend submersible pump with float switch, not a submersible pump. The reason is simple: Float automatically turns the device off when the water level drops below the set level, and turns it on again when the water refills. This is exactly the type of operation needed in a dug well, where the level changes seasonally.

Advantages of the submersible pump with float switch in a dug well:

Lower total cost – no protective pipe, center bars, longer cable and higher-class automation.
Easier installation and service – the pump is lowered on a rope, it does not require careful vertical installation
Dry-running protection built into the float mechanics - no additional probes.
Better fit for shallow wells – where the lifting height rarely exceeds 20–25 m.
Lower energy consumption – the pump only works when there is actually water to be supplied.

Submersible pumps this is currently our widest segment - we have submersible pumps for clean, dirty and sewage water. Additionally, a good solution may be a surface pump with a connected hose inserted into the well; an appropriate filter at the end is enough to avoid the motor seizing up. In our experience, multi-impeller surface pumps are the best choice if, in addition to the house, we also water the garden - several stages of impellers provide stable water pump pressure with variable water consumption. You will find our full offer in the category surface pumps.

Pumps for ring wells from the IBO i offer IPRO

Ours Brand IBO includes a full range of pumps for circular and dug wells - from simple models with float switch to multi-rotor units for demanding installations. For more complex applications, e.g. multi-family buildings or farms, we recommend the line IPRO – with a higher tightness class and a more durable shaft.

Under our brands IBO and IPRO we offer several categories of water pumps that work well in ring wells. Which one you choose depends on the depth of the well, water demand and whether constant pressure is to be maintained in the installation.

Submersible pumps IBO for clean and slightly polluted water – a basic proposal for a single-family house with a dug intake. They work fully submerged. These are the most common submersible pumps for this type of well.
Line IPRO – our professional series, intended for more demanding installations: larger farms, agricultural facilities, irrigation systems and installations with increased requirements regarding efficiency and durability.
Surface pumps (with suction pump) – they work well in very shallow intakes, where the water level does not fall deeper than approximately 7–8 m from the pump axis. The suction pump is mounted above the well, which facilitates service, but requires a functional non-return valve and a tight suction pipeline.
Multi-impeller/multi-level pumps – used where higher water pump pressure and greater lifting height are needed. Each subsequent stage of the impeller increases the pressure by a constant increment, making multi-impeller pumps better able to pump water to a greater height.

How to choose a pump for a ring well - a practical diagram

Choosing the right pump for a ring well should be carried out in four steps. Our practice shows that following this pattern eliminates most selection errors.

Step 1. Measure the well depth and water level. We measure the depth of the well from the cover to the bottom and the static and dynamic water table. From these numbers, we calculate the required water lifting height - the sum of the level difference, pipeline losses and the required outlet pressure. For a standard single-family house, the lifting height is in the range of 25–45 m.

Step 2. Determining the demand. We calculate the maximum simultaneous water flow (l/m) and (m³/h). The standard for a house with 4 people and a garden is 2–3 m³/h, for larger facilities – 4–6 m³/h. Then we verify whether the source can keep up with replenishing resources. On our website you will find a calculator that will help you with these calculations.

Step 3. Parameter comparison. We check the parameters of deep-well and submersible pumps available in the IBO catalog/IPRO – Q-H curves, hydraulic efficiency, engine class. We compare the parameters of submersible pumps with the operating point of a given installation so that the operating point is located in the middle, most efficient part of the curve. The pump motor power is selected with a margin of 15-20% above the value calculated from the operating point - this margin protects against overheating in the event of a voltage drop. Underestimated pump motor power is the most common cause of premature wear of the device. In applications requiring constant pressure in a long pipeline, we use multi-impeller pumps - IBO multi-impeller pumps and IPRO, they have from 3 to 9 stages of impellers and are good at pumping water to higher heights, because each subsequent stage increases the pressure by a constant increment. Pumping water through several dozen meters of a PE pipeline requires checking the hydraulic resistance.

Step 4. Hardware configuration. Purchasing a water pump is just the beginning - a complete installation requires: filters, valves, expansion vessels, a pressure switch and, depending on the complexity of the installation, other types installation equipment.

Our technical department will support you when choosing the right type of pump for a specific task - contact come with us! The selection of a selected submersible pump and the analysis of requirements when purchasing a submersible pump usually take one business day. Choosing the right pump with dedicated accessories guarantees safe use and many years of failure-free operation. If you are looking for specific models, check ours website – there you will find pumps for circular wells and appropriate accessories dedicated to our products.

FAQ – frequently asked questions

Is a submersible pump suitable for any ring well?

Not necessarily. A submersible pump can be installed in a ring well, but only with appropriate, often expensive and complicated equipment. In most wells dug to a depth of 10 m works better submersible pump with float switch.

Which circular well pump is best for a single-family house?

For a single-family house with 4 people and a garden, multistage submersible pumps are standard float switch with a capacity of 2-3 m³/h and a lifting height of 30-40 m. Our IBO offer includes such models both in the 230 V version and with an inverter for smooth regulation of the water pump pressure.

What's the difference? submersible pump from a deep well pump?

A submersible pump is a long, cylindrical body designed to operate in a narrow pipe (drilled well), where the submersible motor is cooled by a flow of water. submersible pump has a shorter, wider design, often with a factory design float switch – works freely immersed in water, most often in a dug well or tank.

Can I install a submersible pump in a dug well myself?

We advise against self-assembly. Installing a submersible pump in a dug well requires a properly selected and installed casing pipe, precise positioning of the pump above the bottom and correct connection of the dry-running automatics. An error at any of these stages can significantly shorten the life of the installation. We recommend that the project be carried out by an installer with experience with submersible pumps.

Is it worth buying an anti-sand pump for a ring well?

In dug wells with a sandy bottom - definitely yes. The anti-sand pump has seals and impellers adapted to work with fine suspension, which significantly extends the life of the pumps in such conditions. An alternative is a standard pump with a well-sized mesh or gravel filter at the bottom of the well.

Where to buy IBO pumps or IPRO to a circle well?

Pumps of our brands IBO and IPRO – as a manufacturer of deep-well and submersible pumps – we distribute through a network of wholesalers and partner stores throughout Poland. The full list of points and the online catalog can be found at Dambat contact page in the tab Company. We will also support you in selecting the appropriate pump and equipment for a specific shot.