Pumps for water containing sand. Screw pumps for wells. Surface and submersible units: pros and cons

A well pump is perhaps the most important component of any well. It is the pump that supplies water from the source to the pipes, ensures its constant flow.

There are many varieties, but today we will focus on screw models, as they have a very interesting design and principle of operation.

1 Features and purpose

Modern well pumps can be surface and submersible. In the first case, we consider a powerful pump with a rotor, which pumps water by sucking it through the working chamber. These devices do not differ in excessive performance and are capable of lifting water at a depth of up to 10 meters.

Submersible pump models are special equipment that pumps water while being directly in a well or well. They are immersed under the water column and left there for the entire time of operation. Submersible models are much more powerful and productive than their surface counterparts.

They are able to work at a serious depth and give out pressure from 50 meters of water column. Feedback from users also suggests that submersible pumps do their job much better, although they are more expensive.

A screw well pump just refers to submersible pumps that are engaged in pumping water from a well. It is called screw due to the fact that the main working mechanism in it is the “Archimedes screw”. This is a rather important nuance, since almost all submersible models for pumping water are equipped with centrifugal elements.

2 Types, characteristics and reviews

If we talk about specific varieties of screw pumps, then there are not so many of them. This is due to the fact that the screw pump itself is a type of submersible equipment.

However, it should be emphasized that screw submersible pumps can still be divided by working depth. According to this parameter, they are divided into:

Standard;
Deep.

Standard screw pumps are intended for use in wells and shallow wells. These can be sand wells that extract water from sandy aquifers. Their depth rarely reaches 20-25 meters, and the flow rate is relatively low.

For such conditions, the screw pump is best suited, as it is able to deliver a stable pressure and practically does not react to working with contaminated liquid.

2.1 Popular manufacturers

It is worth paying attention to the manufacturers of screw models of pumping equipment. Moreover, a lot depends on the manufacturer now. Large companies are interested in satisfied customers around the world. Therefore, you should not expect a dirty trick from their products.

Screw pumps Aquarius of the BTsPE series are very popular now. They are practical, productive and at the same time extremely compact. These products can be installed in wells up to 110 mm in diameter, which is an achievement in itself.

Also on the market there are screw pumps from the Belarusian company of the same name. They are renowned for their low cost and build quality.

From foreign manufacturers, it is worth paying attention to Unipump pumps. They cost a little more, but the high price is offset by extreme reliability and practicality during operation.

2.2 What is the installation technology of screw pumps?

By and large, submersible screw pump models are mounted in the same way as any other downhole stations. Nothing extraordinary is required of you here, although some attention should still be paid.

2.3 How does a screw pump work? (video)

In individual housing construction, when building a water supply system, surface pumps are used for a well for water and for a well. When a water supply system is built on the basis of a well, pumping stations equipped with a relay unit and a membrane tank make it possible to build a system with quick-detachable equipment. Such equipment can be used seasonally, or you can even put it under lock and key every time you leave the country, or take it with you.

In the case of using a well, a similar usage pattern can also be built. However, it has a number of features that should be considered when using surface stations as pumping equipment.

In the well, due to its design features, water from the sandy aquifer flows gradually. The main volume of water in the well is from 4 to 20 tons. This amount of water allows solid impurities to settle to the bottom. In the subsurface layer, well water is relatively free of solids.

In a well, the situation is somewhat different. In the cavern of the well, with increased pumping, water enters from the aquifer with a large pressure. The volume of the cavity is small, because the sand brought by water has virtually nowhere to settle. Sand is sucked up by pumping equipment.

In which wells can a surface pump be used?

One more moment. In deep wells, a surface pumping station will not work. For these purposes, a submersible borehole pump is more suitable. The surface station can be used in shallow wells, comparable in depth to ordinary wells - 8-12 meters. We must not forget that just like from a well, from a well you need not only to raise water, but also to supply it to the house, sometimes to the second and third floors.

We discussed the difference between a shallow well and an ordinary well in the previous paragraph. It turns out that at the same depth in the same area, the well will not “give out” water with sand, but the well will. We will have to select a pumping station for the well, which is guaranteed to work in such conditions.

Now let's move on to the question of which pump is best for a sand well in these conditions. It is worth stopping at the option that has the following characteristics:

Increased capacity to allow scheduling a 20-30 percent redundancy for adverse conditions.
Increased throughput and, as a result, increased cross-sections of all through holes and pipelines.
Basic equipment of a dry-running relay in case of clogging of the sand filter.
Sand filter complete with built-in separator.
Possibility of easy replacement of the filter on the supply pipeline.

Not every pumping station is suitable for working with a tubular well, the trunk of which is saturated with sand. However, almost any station can be used by providing its supply line with a sand filter and inserting an additional filter with flushing between the electric motor and the membrane tank.

Why can't a washable filter be used in front of the station's electric motor? Because in this case, a clogged filter will reduce pressure and eventually the engine will burn out.

Why is it necessary to put a washable filter in front of the membrane tank? Because if you put a filter after the tank, after 1-2 months of operation you will have a non-working membrane tank completely clogged with sand.

The washable filter is good because it can be cleaned by draining the pulp (sand with water) through the drain hole with a tap. Filters with a transparent housing now available allow you to visually monitor the condition of the filter and the amount of sand deposited in it.

If the mesh is too fine, the pump motor will not be able to create the necessary pressure in the water supply system behind the filter.

Of course, the cost of a washable filter is an order of magnitude higher than that of filter replacement elements. But it does not need to be changed, it is enough to wash it.

The cost of the simplest washable filter starts from 1500 rubles.

Which surface pumps can be used

So, surface pumps for a well for water with sand must be of increased power, must have a sufficient electric motor resource and must be equipped with a sand filter. Surface pumps for a well for water with sand can also be additionally equipped with washable filters that will protect the station itself and the water supply system of the house, where water enters the water points.

For advice on surface pumps for use in shallow wells, .

Submersible pumps in sand wells

A few words about submersible pumps that can be used in deep wells. What is the best pump for a sand well? One that is able to "digest" water with sand and supply it upward to the water pressure unit. Already here, at the top, it is possible to organize filtration and removal of sand from the water coming from the submersible pump.

There are domestic and imported pumps on sale, which are designed to work in such conditions. Several types of Aquarius pumps, and the well-known Brook, are capable of supplying water with sand to the surface without harm to themselves.

Why not put a sand filter in front of a submersible pump in a well? Because in case of clogging, you will have to raise to the surface both the filter and the pump, and 8-10 meters of the supply pipeline.

In the case when the filter element is on the surface, it will be enough just to rinse it.

Well pumping

Another case when you need a pump that can "digest" water with sand is pumping any well after drilling. At this moment, the final formation of the well cavity takes place, and its pumping is required for further successful use.

How to choose sand from the well at this stage? The best option is to pump it out. You can use a surface station if the well is shallow, or a submersible pump. If the well has a depth of 15-20 meters.

The efficiency of autonomous water supply systems largely depends on the correct choice of equipment, when deciding which is better for a well, it is recommended to listen to the opinion of experts and read the reviews of the owners of various models of units.

The choice of a submersible pump for a well should be based on an analysis of operating conditions, an assessment of the technical features of the water source.

First of all, pay attention to the following characteristics:

The depth of the hydraulic structure and the maximum possible head of the pumping unit.
The diameter of the casing pipe, and the possibility of using the pump based on its overall dimensions.
Water quality, many pumps are not designed for pumping liquids with a large amount of mechanical impurities (sand).
The required performance of the equipment (expenditure characteristics) must meet the needs of all consumers.

Based on these data, you can choose pumps of various price categories.

Budget pumps

If irregular operation of a well of small depth is expected, then it is quite possible to get by with pumps of an inexpensive price segment. At the same time, it is possible to choose models of domestic and imported production.

Perhaps one of the most popular models of domestic equipment. The cost of the unit is 5-6 thousand rubles, depending on the configuration and modification. The outer diameter of 102 mm allows the pump to be installed in wells with a cross section of at least 110 mm. The body is made of stainless steel (the main working units of the pump part are brass).

Provides a water lift of 50 meters, the maximum capacity of the installation is 2.4 cubic meters per hour. It is distinguished by reliability and unpretentiousness; when installing in a well, it should be remembered that the minimum distance to its bottom should be 60 cm, and the immersion depth should be at least 50 cm.

Ideal for domestic and country needs, can be used all year round, compatible with automatic control systems.

differs in small dimensions and the minimum consumption of the electric power (to 750 W). It can be used to provide water to consumers of various groups, while the maximum flow rate reaches 3 cubic meters of water per hour.

The optimal well depth is 20 meters, while the pump can be installed in hydraulic structures with an internal section of 85 mm or more. A feature of the models of this series is the use of a floating impeller, which makes it possible to increase the reliability of the pump when pumping water with mechanical impurities (sand). The cost of units of this series starts from 6 thousand rubles.

. The products of this brand have always been distinguished by quality and reliability, and this model also belongs to the budget price segment. The pump power of 1.73 kW allows for a flow rate of up to 7.5 cubic meters per hour, while the maximum head is 106 meters.

The unit is equipped with protection against power surges, dry running, which significantly increases its working life. It can be used as part of automated water supply systems, provides filling of various tanks, is considered a universal pump. The average price is 6 thousand rubles.

Costing from 7 thousand rubles, it can be used to supply water with an insufficient degree of purification (up to 150 grams of sand per cubic meter of water). The maximum productivity is 3.3 cubic meters per hour, while the pump can be operated at a immersion depth of up to 30 meters (maximum head 45 meters).

Differs in high tightness, it is easy in service, it can be established in wells, wells, reservoirs of various type.

Medium range pumps

The list of pumping equipment for wells at an average cost is quite extensive, experts advise paying attention to Gileks products. Units with a power of up to 1.1 kW provide a head of up to 115 meters, while the maximum productivity can be 6.9 cubic meters per hour.

The features of the models include the use of a special filter in the design, which allows the use of equipment even in wells with a significant content of sand in the water. During operation, the device does not create vibration loads that can have a negative impact on the well casing.

They have high efficiency, they are reliable and durable, operation and maintenance do not require significant financial costs. The cost of various modifications of water cannons of this brand varies from 5 to 15 thousand rubles.

Quality pumps at a higher price

If you need equipment that can last the entire period of operation of the well, you must give preference to more expensive models.

As a rule, such installations are characterized by high efficiency, reliability, and can be operated in various conditions.

Can be purchased for 27-50 thousand rubles. For this money, you will receive an installation that supplies up to 7.5 cubic meters of water per hour, while the maximum pressure can be 155 meters. They are considered one of the most suitable types of equipment for providing country cottages.

They can be operated in wells with a minimum cross section (internal diameter from 76 mm). It should be noted that the units of this manufacturer are quite sensitive to water quality. Durability and trouble-free operation are provided by various automatic protection systems (against dry running, overheating, power surges, and others).

None of the owners of Grundfos SQ pumps regretted purchasing these particular devices.

Submersible pump "Pedrollo 4BLOCK 4/14" with an average cost of 23 thousand rubles, it allows the supply of water with a sand content of not more than 150 grams per cubic meter.

Italian traditional manufacturers guarantee high quality equipment, pumps are reliable, can be operated for a long period without additional maintenance. It is installed in wells with casing with a cross section of 100 mm or more.

They provide a flow rate of 6 cubic meters per hour with a maximum head of up to 88 meters. All main elements of the device are made of stainless steel, equipped with a three-phase electric motor, the safety of which is ensured by the tightness of the case and the presence of automatic protection systems (IP68 degree).

Water cannon chastotnik 115/75h belongs to the category of automatic water supply systems, the average cost (depending on configuration) is 27 thousand rubles. Provides a flow rate of 115 l / min, a maximum head characteristic of 75 m, can be operated at depths up to 30 m.

Quite easy to use and easy to manage. The automated system allows you to set the required operating parameters (flow rate, pressure in the pipeline, etc.). It allows you to simultaneously ensure the selection of water at several points, it is considered one of the most optimal equipment options for providing a country house or cottage. Recommended when it is necessary to ensure a significant flow of water for a long time (baths, saunas, laundries).

Multistage submersible pump "Wilo Sub TWU 3" differs in traditional German quality, can operate in the mode of up to 20 starts per hour. The main components are made of stainless steel (with the exception of polymer impellers), which guarantees a significant working life of the plant.

It can be installed in wells with a diameter of 75 mm or more, the maximum immersion depth is 60 meters, with a possible head of up to 125 meters. The pump is available with various types of electric motors (single and three-phase), economical and easy to operate, does not require frequent removal for maintenance. The price varies from 29 to 45 thousand rubles.

used to supply water from various sources. The sealed housing provides reliable protection even from dirt. The average flow reaches 4.2 cubic meters of water per hour, the maximum head is 92 m, the immersion depth is up to 25 m.

Equipped with a lower water suction with a built-in filter that provides protection against various mechanical impurities (clay, sand, other inclusions). The impellers are made of special thermal plastic resistant to various aggressive media. It is distinguished by reliability and unpretentiousness, the cost of the unit reaches 22 thousand rubles, which is quite inexpensive for equipment of this class.

The choice of pumping equipment is quite wide, so it is easy to choose the optimal model for various operating conditions.

If you do not have experience in this matter, then you should contact a specialist who can evaluate all the features of your well. In this case, the pump will last a long time and trouble-free.

From the correct choice of pumping equipment for the well, its productivity, durability, and sometimes the operational life of the hydraulic structure itself will depend.

MAIN TYPES OF PUMPS AND THEIR FEATURES

Vibrating- are more often used in wells, since as a result of vibrations they can not only lift sediment from the bottom, but also damage the walls of the wells
Centrifugal submersible– more than once I was convinced that this is the best solution for wells. During operation, a minimum of vibrations is formed, the productivity is large enough, as is the height of the water rise, and overheating is excluded due to the design features of the engine
Drainage or self-priming– their use is relevant for shallow wells or as dehumidifiers for caissons

selection of a pump and equipment for a well, criteria

Water lifting height- these are the total values of the depth of the well (from the point of immersion of the pump to the surface of the earth) and the height of the highest point of the water intake from the ground level. The coefficient of horizontal movement of water is also taken into account if the hydraulic structure is located at a sufficient distance from the house (20-30 meters)
Well type(on sand, artesian) and casing material - we have experienced in practice the damage that vibration pumps can cause to a PET pipe or downhole filter
Volumes of water consumption and maximum total loads
Well flow rate
Water quality in the well and the presence of solid impurities in it

I advise you to rely on the experience and qualifications of professionals in this matter. We will select a suitable pump, offer it to you at a dealer price, and carry out professional installation.

Now I will answer the questions that our clients most often ask us.

Which pump is best for a well?

Based on personal experience, I can say that for wells, regardless of their depth, the material of the walls of the casing string and the type of downhole filter, it is better to use centrifugal (vortex) submersible pumps.

Why?

During operation, they do not vibrate, so they do not raise sediment from the bottom, and most importantly, they are not able to damage the walls of the casing string and the downhole filter. They are also highly efficient and, unlike vibratory pumps, can run longer continuously.

Important!

How to choose a pump The basis of choice is the productivity of the well in relation to the consumption volumes (peak and average).

What types of wells do we drill

Advantages of centrifugal submersible pumps

Centrifugal pumps cannot physically overheat, as water passes through the motor, which consists of a rotor freely rotating due to the force of electromagnetism, and a stator. A stream of cold water moves between them, providing natural cooling.

If there is no more than 10-15 meters to the water surface from the surface, a self-priming pump can be used, but there are a number of difficulties, including the need for additional maintenance and control.

Below I will review the characteristics of several centrifugal pumps in comparison with a vibrating counterpart, so that it is easier for you to understand the difference in performance.

Pump Model	Power	lifting height	Capacity l/h	Immersion depth	Price
Vibration pump BELAMOS BV012, 25 m	300 W	70 m	990 l	3m	2800 rubles
Centrifugal submersible pump Caliber NPCS- 1.5 / 50-550	550 W	50 m	1500 l	5 m	5300 rubles
Centrifugal submersible pump QUATTRO ELEMENTI Deep 1500 Pro 772-531	1500 W	115 m	5460 l	2 m	19500 rubles
Submersible borehole pump BELAMOS TF-60	900 W	60 m	4000 l	5 m	15000 rubles
GRUNDFOS SP 5A-25 3x400V 05001K25 with dry run protection	2200 W	153 m	6500 l	600 m	67000 rubles
Gileks Vodomet PROF 55/75 House (set for automatic autonomous water supply)	900 W	75 m	3300 l	30 m	26000 rubles

As you can see, the characteristics of the pump directly affect its price, but in each price category there are pumps of different performance. I have been convinced more than once that only a professional can determine the priority selection criteria.

Common mistakes when choosing and installing a pump

So what not to do?

“The neighbors have one of these, which means it will suit me too” is a classic mistake. Two wells located 20-50 meters apart can vary greatly in flow rate. In addition, it is important to take into account such factors as material, casing diameter, bottomhole filter type, consumption volumes.
"I'll buy more powerful - in reserve" is another common misconception. First, why pay more? Secondly, a pump that is too efficient can kill a well with a low flow rate by volley pumping. We often had to repair a well, the water quality of which was lost precisely because of the wrong choice of pump
"I'll do all the calculations myself"- even many of my colleagues who have switched to free bread do not always make calculations with high accuracy - there are too many factors and coefficients to take into account. Better leave it to the professionals

Classic when installing pumping equipment yourself:

Incorrect choice of installation depth
Incorrect fastening of the pump on the carrying cable, as a result of which part of the load falls on the power cord
Incorrect connection to the mains

IMPORTANT!

Do-it-yourself installation - is it necessary? I strongly recommend not to regret one or two thousand rubles for the work of specialists who will make all the calculations and carry out the installation correctly.

The optimal installation depth of the pump between the bottom and the water surface for standard water intake

Here we completely turn off the fantasy - the installation depth of the pump is a constant value recommended by the equipment manufacturer. The nuances take place only for high-performance models with a large installation depth. In this case, at least one meter of water column must remain to the bottom of the well.

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At what depth should a submerged pump be installed for pumping a well?

At the stage of pumping a well, we always pursue the same goal - to pump out sand and turbidity from the bottomhole. It is irrational to do this with a centrifugal pump, since they are very sensitive to the presence of fine solid impurities in the water.

Therefore, for pumping (if possible), a vibration pump with a lifting height of up to 80-110 meters is used.

They are not afraid of sand, and they can be installed almost at the very bottom in order to pump out unnecessary dirt from the well to the maximum.

If the well is pumped by a centrifugal pump, then at least one meter must remain to its bottom, as required by the instructions for the equipment.

Dry running protection for borehole pump

Imagine such a situation - you are not at home, a tap leaked, and as a result, the pump pumped out all the water from the well and continued to work.

The result is the replacement of expensive equipment, since the plastic impeller will not withstand high temperatures. If it is protected from dry running - relays, special floats and automation, then such incidents are excluded.

Drilling cost calculation
fine sand wells

Select your region: Solnechnogorsky District Istrinsky District Dmitrovsky District Odintsovsky District Krasnogorsky District Klinsky District Narofominsky District

If you are not in your area, please call us and we will make an individual calculation.

Casing pipe HDPE Pipe PVC-U 129 mm

Filter: For HDPE (stainless steel). For PVC-U (slotted with spraying).

Cable conduit for borehole pump. submersible pump cable extension for a well

I can assure you that you will not find a pump that comes with an electrical cable of the same length as the lifting height for which it is designed, because 120 meters of cable is a lot. The maximum that the manufacturer offers is 15-30 meters.

How to be? Ramp up! I categorically do not recommend doing this on your own, but if you still decide, then here are some of my professional tips:

Use a submersible cable- yes, it is a little more expensive, yes - there will be no disaster if you take a regular one, but if for some reason damage occurs in a simple cable, the consequences can be serious. Submersible is designed for direct contact with water, it is better
Connection must be at maximum height from the water surface - do not cut the cable just before entering the pump - cut the plug
Use special connectors and epoxy resin for hermetic sealing of the joint or special heat shrink sleeves
Use an appropriate cable section corrected for resistance along the length

In general, everything is not simple here either, so I recommend leaving this work to specialists.

Pump and automation for sand wells

Wells for sand in the Moscow region are used mainly for irrigation in garden plots.

The flow rate in such wells is usually low and variable, and the water quality is low, as it contains a lot of sand.

The optimal solution is a submersible vibration pump. It is affordable, picky about water quality.

The subtleties of installing a vibration pump
When installing the pump, it is important to fix it so that it does not touch the walls of the casing string or the bottom filter, otherwise vibrations can lead to mechanical damage to the equipment or the structure itself.

We automate the system based on the vibration pump

The easiest option to automatically turn off such a pump is a switch with a timer.

If you know the flow rate of the well, and it is, for example, 500 liters per hour, and your pump pumps this volume in half an hour, then simply set the timer for 20 minutes to select the desired volume of water and go about your business.

You can also use a float system.

Inefficient pump for a well with a low flow rate

Wells with low flow rates present a serious problem. I often came across the fact that people are looking for low-performance pumps as a solution, but you will not find them, because even the smallest pump has a minimum capacity of 450 liters per hour, and if the well flow rate is 250 liters, then this discrepancy is almost doubled.

What to do? I suggest the following solution:

We install a storage tank for 500-1000 liters in the basement or in the attic. If in the basement, then with a membrane to maintain pressure, if in the attic, then without
We connect automation to the tank in order to constantly keep it full
We install automation to protect against dry running in the well

What do we get as a result? Your country house is provided with water, because even with a very strong desire, you will not make a salvo discharge of 500 liters. The volume of water in the bathroom is 200 liters, one wash in an automatic machine is 60-80 liters, a toilet tank is 8-15 liters.

The pump works in segments of 5-7 minutes, if necessary, replenishing the tank or stopping work if the water in the well goes below a certain level. Problem solved!

Is a vibration pump harmful to a well?

Harmful, and I'll tell you more, if installed incorrectly, it will destroy the well faster than you think. Vibration is to blame. Sometimes the use of a centrifugal type pump is irrelevant, and in these cases it is important to at least follow the installation rules:

Install the vibration pump at least 1.5 meters above the bottom of the well
The pump should not touch the walls of the casing - it should hang freely in the water column
I also recommend using models with an upper water intake - this way it will disturb the face less

Water hammer when turning on the pump and strong shock when turning it off

Water hammer in the water supply system not only leads to the failure of plumbing, but also the pumping equipment itself. This phenomenon occurs when the pump is directly wedged into the system.

It is easy to avoid this - for this I advise you to definitely use membrane accumulators. They dampen sudden pressure surges in the system, extending the life of your expensive plumbing equipment.

Features of maintenance of pumping equipment

During my career, I have come across this issue many times. In fact, in the case of proper installation and operation, the submersible pump does not require additional maintenance. Some models require pre-lubrication of individual elements immediately before installation - nothing more.

When using centrifugal submersible pumps for pumping water with sand impurities, repair may be required - replacement of impellers. All these works should be carried out only by a professional - on your own you can only do harm.

Pump modeAlways follow the operating mode recommended by the manufacturer, do not overload the pump, then it will work properly throughout the entire operating period.

Screw pumps are one of the ways to solve the problem of water supply, which is suitable for a private house, a small farm. These unpretentious devices become the only way out if there is a lot of sand in the well. Equipment of this type works even when the well is very sandy or silty, it lifts water with sand, as well as sand with water, without breaking or clogging. Therefore, for weak wells, Abyssinian wells, screw water pumps are a reliable option that does not depend much on the state of the source.

One of the types of screw pump in the context

Advantage of screw pumps

The ability to pump water with a large number of inclusions is provided by the special structure of the inside of the device.
To understand how a borehole screw pump works, it is enough to consider a conventional kitchen meat grinder, where the main part - a screw or auger - rotates and promotes minced meat or other consistency. In the pump, it is placed in a rubber sheath, connected to the engine by means of a cardan shaft. Devices designed for pumping large volumes have rigid shells and are able to withstand significant pressure.

When the shaft rotates, the screw moves, which follows the developed trajectory - the turns of the screw and the rubberized inner surface form cavities that constantly rise to the supply hose or pipe.
The liquid moves into the chamber, the pressure forces it to continue moving upwards, rarefaction areas continue to form in the inlet pipe, which ensures a uniform supply of water from the well.

The design eliminates the reverse movement of water, and also allows the mechanism to cope even with viscous inclusions (this expands the scope of the device - it is used for pumping various substances with varying degrees of viscosity)

If you carefully examine the sample (or, again, a meat grinder), you can see that sand or other inclusions have nowhere to get stuck or linger - they rise along with the liquid flow.

This design gives an undeniable advantage over equipment for moving water of vortex and centrifugal types, since it is screw pumps for wells that prolong the life of the water source and ultimately save a significant amount.
According to the classification, screw pumps are self-priming devices with a multistage structure. The developed lines of compact models make viable even weak wells with a minimum diameter.

The choice of the optimal equipment is influenced by where it will be installed. For installation in a well, samples are suitable that are attached to the wall of the well shaft.
When installing in a well, it is easier - you need a sample with a strong cable. For the home, a model designed for standard voltage is suitable.

Types of screw structures

Such devices are single-screw or multi-screw. For individual use, a single-screw design is usually used, this is enough to provide a house or a small household with water.
So that there is no sand in drinking water, a coarse filter with a cell is installed on the inlet pipe, which traps particles with a large diameter

In the figure, the filter is already put on the pump

If necessary, the resulting water is filtered - subjected to fine purification.
Water analysis is carried out to determine the need for additional filtration.

Rules for the operation of the screw pump

In addition to stable performance, independent of water quality, the borehole screw pump allows self-installation.
The internal structure, in which there is literally nothing to break, together with high-quality materials, eliminates the worries of solving the problem for a long time - the screw version has been working for at least 10 years, without reminding of itself and without requiring much attention.

The screw pump for the well is cooled during operation - this is done by the pumped liquid. Thanks to this, the screw moves smoothly, no additional seals are required. The engine is located below the inlets, this protects it, natural cooling occurs
In addition, the design makes the operation of the device almost silent - it is not audible, even if the well is located within the house
The well will keep working longer, as there is no vibration that affects the source
Even in case of breakdowns and malfunctions, it is quite possible to replace parts on your own - the design is so simple that a person without special skills can do it
A screw submersible pump can work not only in wells - there are no requirements for the position of the device: it is located horizontally and vertically. This allows you to freely use it when pumping water from rivers, reservoirs, other containers and sources.

Disadvantages of screw pumps

With versatility and incredible reliability, screw pumps have disadvantages - a very short list:

A durable screw well pump is expensive - there are cheap options, but their cheapness is relative. This is due to the technological complexity of its production.
There are affordable models, but they are short-lived - for one or two seasons, so if you plan to install for a long time, it is better to consider the products of firms, Russian or foreign with a price of $ 200 and appropriate quality
An idle screw pump for a well is not able to work - it will fail
The amount of liquid supplied cannot be adjusted.

Downhole installation

The installation of a screw pump in a well is standard, there are no special features. This is an elongated cylinder with a cable in the upper part, connected by a power cable, depending on the design of the cables, there may be several. A hose or pipe for supplying water of the appropriate length is attached to the outlet pipe.

When installing, the depth at which the submersible screw pump will be placed is calculated; after measurements, a mark is placed on the cable or cable.
Some pumps are equipped with float switches, so before installation, you should study the instructions, if it is provided, connect it.

It is important to securely fasten the cable, if the equipment breaks and falls into the well, it will be difficult and expensive to get it

An indicator of proper installation is quiet operation, without noise, vibration, knocking.

Brief overview of screw pump manufacturers

Almost all manufacturers have a range of electric pumps of this type.

The products of the Ukrainian manufacturer "Aquarius" are popular. Narrow, suitable for wells with a small diameter (at least 10 cm), relatively inexpensive. Withstands use in harsh environments

"Belamos" (Belarusian brand) - stainless steel models, often equipped with additional thermal protection of the engine. You can use a device with any power. There are options suitable for small casing diameters

Unipump (Chinese manufacturer) is a cheap, reliable option for springs and wells where low performance equipment is recommended. Even if at the same time a well or a well gives water with a large amount of sand and impurities, this does not have any effect on the operation of the pump. This is a well-known company whose goal is to provide consumers with affordable workable equipment. Judging by customer reviews, in most cases the manufacturer succeeds

Grundfos is an expensive brand under which quality equipment is supplied. There are models with a diameter of 75 mm or more, suitable for low-productivity wells and wells, they pump water up to 55 meters. Other screw pumps are presented, capable of operating in various wells with different capacities.

Conclusion

If the water in the well is of poor quality, with sand and silt, a submersible screw pump will solve the problem. It is able to lift water with sand without failing at the same time, and is also used to clean silted and clogged wells.
Buying not even the cheapest screw equipment will cost less than drilling a new well.