Individual water supply of a private house cannot be imagined without pumping equipment that delivers water to the consumer; for this, several modifications of electric pumps with different operating principles are used. One of the popular types is a screw pump for a well, mainly used for water intake from sources whose water basins are located on sand.
Screw (screw) electric pumps, represented on the market by submersible models, are produced by many leading domestic and foreign manufacturers of pumping equipment, their cost does not go beyond the average price for this category of units. In order to choose the right electric pump, several classes with different operating principles are considered, while a screw borehole pump under certain conditions has some advantages over other varieties.
Rice. 1 Popular models of screw pumps
Pumps installed for pumping water, depending on the location relative to the water source, are conditionally divided into two groups: surface and submersible.
The first ones are installed on the ground next to the well, a pipe or a pressure hose is lowered into the mine for water intake, while the maximum suction depth (location of the water mirror from the surface soil layer) does not exceed 9 m. technical characteristics with a maximum volume of pumped liquid of 5 m 3 / h and a head of about 50 m, the efficiency of devices is not more than 50%. Usually, surface units are included in the package of pumping stations, which are a single unit in which, in addition to the electric pump, a hydraulic accumulator and a pressure gauge are installed.
Submersible pumps are presented on the market in several varieties with different operating principles, depending on the design, cost and quality of well water, they are used in the household for a variety of purposes.
Rice. 2 The principle of operation and design of a centrifugal electric pump Centrifugal
Centrifugal electric pumps occupy a leading position among other types due to the following design feature arising from their principle of operation - the inlet water flow enters the impeller axis and is displaced by its blades through the nozzle on the side of the casing. Thus, it became possible to connect any number of centrifugal wheels with chambers (stages) in series with an increase in pressure at each stage.
The pressure in household modifications reaches 200 m or more, the throughput is up to 20 m 3 / h, the efficiency increases with an increase in the dimensions of the pump unit and reaches 65% for household high-quality models of Danish and Italian production.
High-quality centrifugal electric pumps from world-famous European concerns are equipped with internal protection against winding overheating in the absence of coolant, have a built-in check valve, expensive models are equipped with an electronic shaft speed control unit depending on the amount of water consumption using pulse-width modulation. This solution makes it possible to reduce the dimensions of pumping equipment, practically eliminating them, as well as save electricity, reducing its consumption by 40%.
Consumers are in high demand for centrifugal pumps from the world's best manufacturers of pumping equipment: Grundfos (Denmark), Pedrollo, Speroni (Italy), Wilo (Germany), Russian brands Belamos, Aquarius, Unipump (manufactured in China). It should be noted that the difference in prices between the products of leading foreign companies and products of Russian or Chinese production is quite significant, a high-quality electric pump from Grundfos costs about 1000 USD, while a domestic or Chinese pump with similar characteristics can be purchased for 200 USD. e.
Rice. 3 Vibrating electric pump - device Vibrating
The manufacturing technology of vibration electric pumps has not undergone significant changes since Soviet times, so there are many Russian brands on the market, there are products of Ukrainian and Belarusian production, and Chinese models are present in sufficient quantities.
The difference between vibrating electric pumps from other types is the absence of rotating parts and, accordingly, bearings, the principle of operation is based on the reciprocating movement of the coil armature when AC is applied to its winding. A rod with a piston that draws in water is welded to the armature of the electromagnet; a check valve is installed near the inlets to prevent the outflow of liquid into the source.
Vibrating models have a rather low efficiency of about 35%, the maximum volume of the pumped liquid does not exceed 1.5 m 3 / h, the head is not more than 80 m.
These characteristics are considered not too high to provide water to a private house with even one person living, therefore, vibropumps are mainly used for household purposes: for irrigating garden beds, filling pools, ponds, various types of containers with water, and drainage work.
Since vibrational species are not too sensitive to a high content of suspended particles in water, they are often used for pumping wells and wells, extracting turbid water with clay-sand fractions from them.
Vibrating pumps are classified as products of the budget price category, their minimum cost is about 20 USD, the average price of a typical high-quality unit is 30 USD. On the market, vibropumps are represented by a large number of domestic (Brook, Malysh, Summer Resident, Aquarius, Whirlwind, Bison) and Chinese (Oasis, Patriot) brands.
Rice. 4 Peripheral pump - design Vortex
In vortex varieties, water is sucked in through the side opening of the hydraulic part of the housing by the blades of the impeller and then thrown out through the discharge pipe located next to the suction channel.
A feature of vortex pumps is the small distance between the impeller of the petal wheel and the walls of the working chamber, which is necessary to reduce hydraulic losses, so the units operate only in clean water. The highest pumping volume of household electric pumps of the vortex principle of operation does not exceed 5 m 3 / h, the pressure reaches 100 meters, the efficiency is not more than 50%.
In vortex models for domestic use, the feed wheel is located at the top near the outlet, and the electric motor with a vertical shaft, on which the vortex wheel is mounted, is installed below.
Liquid suction occurs through a perforated filter located around the impeller - by its location in the upper part near the outlet pipe, it is easy to determine the vortex principle of operation of the electric pump.
On the market, vortex pumps are less common than centrifugal models, domestic manufacturers are represented by the Belamos, Whirlwind, Unipump brands, and the Italian Pedrollo Davis deep-well pump is popular.
Rice. 5 Screw pump - internal device and screw assembly Screw (screw)
Electric pumps that suck in and push water using the Archimedean screw method are called screw pumps, this is the second most popular group after centrifugal pumps. In household appliances, the screw is located in the upper part and is connected through an adapter to the motor shaft.
The advantage of screw electric pumps is the simplicity of design and the ability to work effectively with turbid and dirty water, as well as with viscous media, thanks to the latter feature, screw modifications are widely used in industry for pumping oils and refined products.
There are no screw electric pumps from world trade leaders (Grundfos, Wilo, DAB, Pedrollo, Speroni) on sale, the units are represented by well-known Russian brands Belamos, Jemix, Whirlwind, Unipump Eco Vint, Aquarius, Sturm group of companies.
On sale you can find screw electric pumps and less popular brands of Russian and Chinese production: Host, Alba, Oasis, Patriot, Vodotok, as well as Octopus from the Ukrainian company Varna from Kharkov.
Note: A distinctive feature of domestic-made vortex electric pumps is perforated rectangular holes in the upper third of the housing through which water is drawn.
Rice. 6 The principle of operation of the screw pump
The principle of operation and design of the screw pump
In a standard auger household electric pump, the working screw is made in the form of a spiral pin made of corrosion-resistant material, which is chrome-plated steel, stainless steel or high-strength plastic. The fluid sucked in by the rotating screw enters the technical polymer cage and is then pushed out into the upper outlet pipe of the electric pump.
A screw electric pump used in everyday life consists of the following main components (Fig. 7):
1 — Electric part with a vertically located single-phase electric motor with a dry rotor and an oil-filled chamber separating the engine compartment from the hydraulic part, a starting capacitor is located inside the lower part of the housing.
2 - The hydraulic part consists of a housing, a water intake filter and a working auger rotating in a holder made of an elastic polymer (rubber) - a screw and rubber coupling assembly pushes the liquid entering the housing through perforated holes 3 to the outlet pipe.
3 - The intake part is a stainless steel cylinder with holes made in the side walls for drawing in water.
4 - On the top cover of the pump, made of brass or stainless steel, there is an outlet pipe and lugs.
5 - The outlet pipe is made with an internal thread with a standard diameter of 1 inch, a check valve and a water-lifting hose are attached to it.
6 - A nylon or metal cable in synthetic protective insulation is tied to the eyes.
Rice. 7 Structural arrangement of the screw pump
Distinctive features and parameters of screw electric pumps
A typical screw pump for wells used in individual water supply has the following technical parameters:
- Power supply voltage: variable 220V ± 10%, with a frequency of 50 Hz.
- Temperature range of pumped liquid: from 0 to 35 °С.
- Pumped water pH: 6.5 - 8.5.
- Operating temperature range of the environment: from 0 to +40 °C.
- Minimum immersion depth under the water mirror: 0.5 m.
- Permissible volume of mechanical particles in the pumped water: - no more than 500 g/m 3 , the content of fibrous materials in the liquid is not allowed.
- Permissible diameter of mechanical fractions: - 1 mm.
- Maximum pressure: 3 m 3 / h, for most models it does not exceed the threshold of 1.5 m 3 / h.
- Limit head: up to 200 m, this indicator is a rare exception, most modifications create a head pressure of no more than 100 m.
Rice. 8 Key Features of Chinese Oasis The main advantages of screw electric pumps:
- Low cost, the price of the cheapest models is about 80 USD, in general, all models are cheaper than centrifugal types.
- Simplicity of design. The working part consists of a screw and a rubber cage, they are easy to maintain and, if necessary, simply replace, which makes the repair of auger units very simple.
- A screw pump for a well, due to its principle of operation, can transport liquid with large fractions of sand and clay deposits - this is its main advantage. A submersible screw pump is preferably used for water intake from well sources on sand, often with a high content of suspended particles of clay and sand. Although their parts are mechanically attacked by solid particles, the life of the screw pump in turbid sources will be longer than that of centrifugal models.
The disadvantages of screw units include the mediocre quality of many products (chrome-plated screw, quickly abraded clip) and not too high technical characteristics, noticeably inferior to centrifugal types, as well as low efficiency, not exceeding 45%.
Application area
We can say that a screw pump for a well, due to the ability to pump out dirty water, is the leader in the number of areas in which it is used in household chores. A screw borehole pump is purchased for:
- arrangement of water supply for cottages and wells;
- filling artificial ponds, pools, tanks for heating and drip irrigation;
- irrigation of vegetable gardens, orchards and any areas with plants in the garden;
- drainage in case of flooding of basements, cellars and basements in the house;
- pumping wells after drilling, some professionally engaged firms specifically purchase screw pumps for this purpose;
- cleaning wells and wells from silt deposits.
Rice. 10 Parameters of screw pumps of the Unipump Eco Vint series Well installation rules
To immerse a screw electric pump into the well, either an adapter is used, to which a cable is tied and a water supply pipeline coming from the unit is attached. Usually, before diving, tie the pressure hose, power cable and retaining cable together with insulating tape or plastic ties, the following rules are observed during installation:
- Lifting pipes can be selected from low-pressure polyethylene (HDPE), steel or flexible elastic polymers, the main condition is the ability to withstand the maximum pressure in the system and an internal bore diameter not lower than the thread size inside the outlet pipe.
- When using a flexible hose, make sure that there are no kinks or twists.
- For lowering and lifting, use only a nylon or metal (stainless) cable, it is forbidden to hang the unit by an electric cable.
- Before diving, make sure that the inner diameter of the casing string is higher than the outer dimensions of the pump casing together with the electric cable, and that the pipes do not have bends or narrowed sections.
- It is not recommended to place the power cable in a coiled coil - this leads to its overheating and melting of the insulation.
- The minimum distance of the pump from the bottom of the well is 0.5 meters, the optimal distance is 1 m.
- It is forbidden to operate the pump on a closed tap - this will lead to its failure.
- Mandatory installation in the control system, even if there is an internal protective automation against overheating of the winding.
- When installing modifications that do not have a built-in check valve, it is installed on the outlet pipe in front of the water-lifting pipeline.
Rice. 10 Scheme of installation and connection of the screw unit
When comparing which borehole pump is better: centrifugal or screw, there is no definite answer, since the scope of these pumping units is slightly different. Screw electric pumps are usually used in situations where it is necessary to work with contaminated water, while due to their relatively low technical characteristics, the well should have a shallow depth or be located closer to an individual house. It is impossible to find European-made screw pumps on the domestic market, all goods are supplied to the distribution network by domestic and Chinese firms, so user reviews regarding the quality and materials for manufacturing screw units are contradictory.
Borehole pumps for water with sand allow you to get purified and high-quality water. Thanks to its own water intake source, the owner of the site will not depend on a centralized water supply.
Sand wells are the most common sources, as they are located on the first layer. This design requires careful selection of the pump. The resulting water will initially be heavily polluted with sand, so not every unit will be able to pump it efficiently. This will create an additional load on the pump, so the sand source requires the use of special powerful equipment.
The aquifer is represented by sand deposits. The porosity of the material is large, and therefore the mobility of each grain of sand is also high. Sandy water flow creates an additional load on the pump. The device cannot pump dirty water for a long time, so it burns out quickly. It is beyond repair. What to do in such a situation? The reasons for the rapid failure of equipment is a poor-quality pump.
Specialists in the field of water supply have developed a method for additional protection of water and equipment from sand. When arranging a hydraulic structure, a natural filter made of fine crushed stone or pebbles is used. This is a good way to stop any sand scouring or movement throughout the well. For greater efficiency, a mesh type of filter is mounted at the end of the casing pipe.
Machine description
The sand pump is a single-stage and centrifugal equipment. The main task of this design is the pumping of abrasive slurries, waters with various impurities. But for effective pumping, a liquid must have certain properties.
The pumped solution must have:
- certain temperature (+5…60°С);
- density up to 1300 kg/m³;
- content of solid inclusions (up to 25%);
- maximum microhardness up to 9,000 MPa.
Feedback on such pumps is positive. The sand aggregate is able to work for a long time. It is used in metallurgy, mining, construction enterprises. Such an installation is easily used to clean the trench. A pump for pumping silt or sand can simultaneously perform several tasks:
- clean the trench for its subsequent filling;
- remove sludge, silt, clay, waste;
- clean caissons during construction work;
- restore coastal areas;
- pump out marble dust;
- purify various reservoirs;
- extract sandy elements from the bottom of the reservoir;
- pump out sand from various wells and wells;
- destroy gold mining tailings.
The pump cannot be used for pumping, pumping water and other cleaning work in fire and explosive conditions.
Aggregate classification
Taking into account the throughput of solid particles, pumps are divided into several types:
- gummed - pass particles up to 2 mm;
- corundum - particles up to 1 mm;
- wear-resistant structures made of cast iron pass particles of clay, sand, silt up to 6 mm.
Another classification reflects the location of the shaft (vertical, horizontal). Type P units are cantilever horizontal structures. They are used for pumping or pumping ore beneficiation products. The robust part is made of wear-resistant cast iron. Devices maintain solution density up to 1300 kg/m³. The admissible height of the cavitation reserve is 2 m. The designer must not fall below this height.
Units of type PB (pumps from a well) are either horizontal or console format. But such centrifugal plants allow having a cavitation reserve of up to 5 m - this is their main feature and advantage.
The PR model from a well is distinguished by the presence of a corundum main part of the flow path. Often it is on an organic ligament. Types of pumps from the well PKVP, PRVP - cantilever, but vertical designs. This is a submersible view of installations, the supports of which are outside the pumping of liquid. Industrial model EZG slurry pump is the most advanced pump from the well, the durable part of which is wear-resistant rubber.
Surface and submersible units: pros and cons
The pump can be surface or submersible. What is their difference? Surface view - a powerful design that has a rotor. The main task is to pump water or sludge by sucking them through the working chamber. Such a borehole pump can lift slurry from a depth of up to 10 m. The advantages of such a pump:
- easy transportation of liquids over long distances;
- reliability.
Such installations have a number of disadvantages:
- high level of noise and vibration;
- inability to use if the well is deep and wide.
A dredging well slurry pump is a submersible model designed to pump water specifically for a well or well. Before starting work, the structure is immersed under the very thickness of the water. She is there until the completion of all work. Such a device quickly and efficiently pumps water with sand. The advantage lies in working at serious depths of a well or well. The exact data and characteristics are individual, depending on the brand of the manufacturer and model of the equipment.
Design advantages:
- the electric pump is small in size and weight;
- can work for a long time without maintenance;
- can be used in deep wells;
- high performance and efficiency;
- the presence of protection against drainage;
- can work in automatic mode when working with a high content of sand in the water.
Surface pumps are used for dirty water. Drilling is carried out from the depth of work and cost.
This unit is suitable for operation at shallow depths (up to 8 m).
Other types of pumps
The vibrating pump is a submersible equipment that is not applicable to sand wells. Its technical indicators do not imply the processing of dirty water. There is a risk of partial or complete sanding of the installation. This requires thorough flushing and pumping with the help of professionals.
The centrifugal installation is a submersible mechanism. Its action is based on the injection of water into the outlet due to the rotation of the working blades. The main role in this functioning is played by centrifugal force, while water is supplied with high pressure from the well to the water pipe.
Experts advise using submersible centrifugal devices for water with sand. Their feature lies in the good ability to pump dirty water. The performance of these designs include pumping fluid with inclusions. But you should not experiment on your own with the endurance of the unit.
The screw submersible pump is capable of pumping sand. It works on the principle of Archimedes (the work of a meat grinder). The screw-type submersible pump is easily mounted in deep wells (up to 300 m). Before purchasing it, you need to study the following parameters:
- average daily volume of water consumed by families;
- well depth;
- parameters of the casing pipe of the source itself;
- well flow rate.
Based on these data, the user can choose a device that is suitable for the planned water well.
Autonomous water supply has become a dream for many residents in the Russian Federation.
This is especially true for owners and land plots.
The reason is also in the constant deterioration of the quality of carriers on central highways.
Then from the very beginning it is necessary to decide on the choice of such a device as a borehole pump for dirty water.
Downhole pumps for dirty water have found application in various areas of life:
- Filling containers in fire fighting systems.
- For those who extract thermal water.
- Provision of construction and industrial facilities.
- Supply of fountains.
- When irrigating crops.
- For the needs of drinking and households.
Submersible pumps. About their varieties
- Vibration pump deep for dirty water. They are considered a universal solution. Used for irrigation in suburban areas. Differ in simple service, small dimensions.
- Screw pumps. They work even if impurities are contained in the amount of forty g / m3. Able to function at a depth of up to fifteen meters, form a pressure of 90 meters.
- For vortex models, the maximum possible amount of sand is the same 40 grams per cubic meter. But the depth of operation is increased to 30 meters. The pump inside consists of a special wheel. The water supply is based on the swirling principle. Such devices create a high pressure indicator, although they weigh very little.
- The centrifugal type models differ in power. They are capable of lifting water from a depth of up to 200 meters. The pressure exceeds a hundred meters. The presence of built-in thermal protection is an additional feature.
Features of the choice of borehole pumps
First, the buyer is determined with the parameters that must have. After that, there will be very little to do. Here are some examples:
- 3-4 people live in the object. They consume 1.2-1.6 cubic meters of fluid per hour.
- We were engaged in the construction of a hydraulic tank, with a 100-liter capacity. In the on state, pressure up to 2 atm should be maintained, and in the off state - 3.5.
- The distance from the house to the well is 15 meters.
- 20 meters is equal to the dynamic level.
- The performance indicator is up to three cubic meters per hour.
- The borehole diameter or casing pipes differ in size of 133 meters.
- Finally, a well was dug to a depth of 50 meters.
We can easily fit pumps with 3-4 inches, if you look at the borehole dimensions. Only after that we calculate the performance we need.
First you need to find out what height of water rise in the well we need:
- 20 meters or 2 atmospheres is an indicator of the dynamic level.
- 0.15 atmospheres or 15 meters - the distance between the house and the well.
- There is a 3.5-atmospheric pressure index when two conditions are simultaneously met: the pump is turned on plus running out of water in the GA accumulator.
It is necessary to add the values that we received: 2 + 0.15 + 3.5 \u003d 5.65 atmospheres. If you translate them into meters, it will be 57. This is the minimum level of pressure that is required in these specific conditions.
But it is necessary to take a closer look at the performance in the pipeline and pressure losses. Sometimes these indicators can be quite a lot.
Especially if the diameters of the outlet of the pipeline and the ones responsible for transporting the liquid do not coincide with each other. About 10-20 percent are usually losses on fittings and pipes.
How to decide on a brand
Rapid failure becomes the performance of equipment at a low level of quality.
It is best to trust manufacturers whose reputation is beyond doubt.
Here are just a few brands that have already earned the recognition of buyers around the world.
- Russian Belamos.
- Water Technics from Taiwan
- Lowara from Italy.
- Pedrollo from Italy.
- Grundfos from Denmark.
A separate discussion deserves a series of pumps SQE, released by the manufacturer Grundfos. The main difference from analogues is the presence of the so-called frequency converter. Thanks to this detail, the likelihood of water hammer is reduced.
Starting currents remain not as high as usual. There is an electronic unit responsible for remote control.
It would be best to contact a company that has a license to provide the relevant services. But there are always moments that deserve special attention.
- The smaller the diameter of the device, the better. Then the probability of jamming will be much less.
- The installation of pumps is carried out 1 meter below the place where the dynamic water level is located.
- Well heads with water supply pipes should be below the level at which the soil begins to freeze. For this, the head is placed in a caisson. Instead, you can use an adapter, this device has a more affordable price.
- The length of the cable and the power of the pumps determine the cross section that the power cable must have.
- With plastic clamps, the cable is attached to the HDPE pipe, this is done every 3-5 meters.
- Two cables are recommended to be connected using a heat shrink type sleeve.
- Only a stainless cable can play the role of a safety structure.
There are certain rules along with requirements, the observance of which ensures uninterrupted operation for a long time. For example, water for these devices is not only a working fluid, but also a coolant. Pumps generally cannot work properly without water.
The liquid level sensor will help to avoid the so-called "dry mode" of operation. Thanks to this sensor, the power supply is turned off if the water level drops below critical levels.
Literally all parts of the device must be made of stainless steel. The cost in this case will be higher than that of analogues from others, but the costs pay off.
- Stainless steel parts do not have any effect on the taste of water, its composition.
- When oxidized, such structures are not destroyed.
- Because of what the cable does not break, and the pump does not fail ahead of time.
What causes borehole pumps to fail?
Most users are accustomed to the designation of only indirect signs for breakdowns.
These may include high electricity consumption, vibrations with interruptions in water supply, high noise levels, reduction, and so on.
The main thing is not to lead to a serious accident, to start acting when even the slightest signs appear.
The pump must be immediately lifted to the surface in order to carry out a thorough inspection.
Fine suspended particles, together with water, have the most serious effect on the pump.
It is possible to have various:
- After that, the sensors stop working correctly.
- Maintaining too high a temperature of the pumped water.
- Incorrect fixation at the steel safety cable on the head.
- Power and supply circuits operate with poor signals.
- An unprotected pump is adversely affected by high voltage surges that occur too often.
- Approximation of the dynamic level to the mark of a critical nature. Because of this, parts rub against each other more. Overheating of nodes that rotate appears. The power consumption is growing. Finally, the level of resistance rises.
- The housing is broken tightness, which leads to the penetration of moisture inside. Because of what there are failures in working electronics. The operation of the entire device is disrupted. A possible result, if inactive, is the appearance of short circuits.
- Fibers together with abrasive particles have a negative effect.
In any case, the pump must be raised to the surface. But one can only study indirect signs, and follow the path of exclusion. It is required to carefully inspect each of the parts in stock.
In the same way, the electric motor is checked. Be sure to check the power supply.
Troubleshooting the pump
Situations with a decrease in the dynamic level inside the device cannot be attributed to the group of serious breakdowns. But this situation has a direct impact on the performance of the device.
The pump quickly fails if it runs in a "dry mode". If this is what caused the problem, the pump is first lowered to a depth recognized as safe.
The valve is one of the parts operating in the mode of constant wear. It must be changed if water flows through the device, where there is too much sand.
Clamps with stainless steel cable are the perfect solution for any system. The electrical cable is responsible for the flow of electricity.
A good pump is a device with difficulties not only in technical terms. He also has other whims.
The most stringent requirements relate to the electricity network, stable operation. Plus or minus ten percent is the tolerance for most classic pumping stations.
In the case of submersible pumps, a deviation of 5 percent is allowed. It is better to put voltage stabilizers, then the supply voltage will flow without interruption.
Choosing the right pumps requires careful calculation, but it's not as difficult as it sounds.
How to distinguish a pump for dirty water from a drainage one is presented in the video:
If you decide to equip your own water intake source (well) and at the same time drill it into the first aquifer (and these are, as a rule, sand wells), then you will have to think carefully about choosing a pump. Since pumping water contaminated with sand is not within the power of every unit. Even the smallest grains of sand from the bottom of the source, accidentally falling into the pump, can disable it forever. And standard flushing of equipment will not help here.
What types of pumps will be best for a sand source and how to choose the right device, we understand below.
In order to understand the purpose for which a pump for a source of this type is so carefully selected, it is not superfluous, but even better, to know its device. So, the aquifer in this case is sand deposits. And since the porosity of the sand is quite high, the mobility of the sand grains is also high. That is, when water moves in the reservoir and when it enters the well, as well as under the influence of a forced device (in our case, a deep pump), the sand will rise and fall into the pumped water. Thus, the supply of dirty water to the water supply system is not ruled out.
But this is not the biggest problem. Much worse is the fact that the motor of a pump pumping dirty water with sand will simply not withstand such loads for a long time, and will burn out. In this case, the deep unit is not subject to repair. Now weigh: are you ready to pay a tidy sum again for a new pump and at the same time know that the cause of the breakdown of an expensive device was negligence when choosing a pump?
Important: in order to provide additional protection of water and pumping equipment from sand, when arranging a well bottom, professionals form a natural filter from fine crushed stone and pebbles. This allows you to stop the washing and movement of sand in the well. Here, a strainer is mounted at the end of the casing pipe.
vibration pump
The use of this type of submersible equipment for sand wells is highly discouraged. Firstly, the device itself, according to its technical indicators, does not accept the processing of dirty water.
And, secondly, the oscillatory movements of the pump in the well will simply create ideal conditions for the movement of grains of sand in the water. In addition, there is a risk of partial or complete sanding of the well, which will require its thorough flushing and pumping with the help of professionals.
Surface pump
Although this type of unit is suitable for working in shallow wells (up to 8-9 meters deep), it cannot process dirty water. Even the smallest percentage of inclusion of sand in water can disable the unit once and for all. Moreover, such sensitivity to various components in water is inherent in both a vortex unit and a centrifugal unit.
Important: surface pumps are an ideal solution for a small summer cottage and a well (well) with a low flow rate.
Benefits of a centrifugal pump
The ideal solution for a sand well is a submersible centrifugal pump. Its ability to pump water with inclusions of sand, silt or clay allows you to be calm for the unit.
A distinctive feature of such a submersible unit is its ability to pump dirty water with sand and other small inclusions. So, for some centrifugal-type models, the following indicators are relevant:
- Submersible pump "Vodomet" from the manufacturer "Dzhileks" - 150 g / m3;
- Deep pump "Aquarius" from the same manufacturer - from 150 g / m3 and above.
Moreover, user reviews indicate that such models of pumps successfully pump dirty water with the inclusion of sand in it up to 1.5 kg / m3.
Important: and yet you should not experiment and let the equipment wear out. It is better to ensure reliable bottomhole filtration before installing the pump.
Advantages of screw pump
Another type of quality pumping equipment for pumping dirty water. Such a unit works on the principle of the Archimedes screw familiar to everyone (a similar screw is installed in all models of meat grinders).
It is known that the ability of a screw submersible pump to pump sand sometimes led to the fact that quite long “sausages” of clay and sand rose from the bottom of the well. And manufacturers of such equipment guarantee that the pump can pump water with a sand content of up to 2 kg / m3.
It is noteworthy that screw-type submersible pumps can be mounted both in shallow wells and at a fairly large depth (up to 300 meters). In this case, the performance of the unit will be constant.
And one more thing: if you doubt the correctness of your choice and do not know which unit is better to buy, then consult with professionals. Since before buying a pump (surface or submersible), in any case, you need to know such parameters as:
- Average daily volume of water consumed per family (house);
- Well depth;
- Source casing diameter;
- Well flow rate.
Only in this case you will be able to choose the most optimal pump model for your sand well.
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