Common breakdowns of Grundfos pumps and how to fix them. Advantages of the Grundfos range of pumping stations Grundfos booster pumping station

The history of the Grundfos brand begins with the post-war devastation, when a small repair shop arose in Denmark, which grew into a powerful electrical giant with subsidiaries around the world. Today, in every corner of the planet there is at least one of its divisions that produces equipment according to the climatic principle.

Grundfos equipment is widely used in various fields National economy– construction, agriculture, activities of public utilities.

The structure of consumer demand for the previous year speaks for itself - about half of the demanded goods come from this manufacturer.

Features and classification of Grundfos pumping stations

Among the pressure equipment, a significant part of the models belongs to the group of automatic stations, which have a place in every home.

Their advantages are:

• practicality;
• economical consumption of electricity;
• excellent specifications;
• compactness;
• a wide range of options for various situations;
• easy installation;
• acceptable price.

Depending on the intended use, they can be divided into several groups:

• household models - convenient and safe models for a private home;
• in submersible or surface versions;
• step-up equipment - mounted in utility networks and in production;
• fire extinguishers are powerful systems that create a large pressure of water.

The device of pumping stations "Grundfos"

Pumping stations of this manufacturer have a typical for most other automated systems structure:

• electric motor;
• receiver;
• centrifugal impeller in the inner cavity of the housing;
• 2 check valves;
• flow sensor;
• electronic control board.

Household modifications of automatic stations "Grundfos"

Suitable for cottages or private homes that require regular water supply.
Available in several series:

Let's take a closer look at each of them.

Pumping stations "JP"-series

Created on the basis of high-performance centrifugal units. They are equipped with a removable hydraulic accumulator and an ejector, which allows them to be used not only for surface shallow tanks, but also for a well or well, reaching 25 m in depth.

Productive and compact model, which is considered the best value for money. Its package contains everything you need to start the installation of the device and a long service life.

Features "Grundfos" JP Basic 3PT:

• multitasking - use not only to increase the pressure in the water supply, but also for drainage, irrigation, distillation of liquid from ground and underground sources;
• volume receiver;
• easy installation, which can be done by hand without connecting specialists;
• material design of the structure, which provides anti-corrosion properties and protection against premature wear: aluminum case with chromium-nickel coating;
• lack of annoying noise - the device can be installed in residential premises;
• nice gray design products;
• light weight - transportability and ease of movement.

Specifications:

• Electric motor - 0.85 kW;
• Head - 47 m;
• Suction height - 8 m;
• Receiver - 20 l;
• Weight - 18.5 kg.

Automatic pressure unit, created on the basis of a self-priming pump and a membrane accumulator. Equipped, in addition to the above items, asynchronous electric motor, pressure control switch, pressure gauge and electrical cable. It has a built-in ejector, which allows you to work in suction mode.

It has a similar principle of operation to the previous model. The number of starts per unit of time will depend on water consumption - if there is none, the pump operates offline.

Advantages of Grundfos Hydrojet JP-6:

• reliable automation, which almost never fails;
• motor thermal protection - you can operate the equipment at full capacity;
• a membrane receiver, which increases the intervals between subsequent inclusions, allows the engine not to work with a slight violation of pressure;
• aluminum housing, the top and inside of which is coated anti-corrosion coating for long-term and successful work;
• emphasis on chromium-nickel steel in the performance of other parts and work units;
• practicality and functionality - a variety of applications, no need for special maintenance and frequent repairs;
• unsuitable for contaminated sewage with abrasives and fibers - only clean drinking or technical water without impurities;
• t 0 C of the pumped liquid - up to +50 0 C;
• modern design.

Specifications:

• Electric motor - 1.4 kW;
• Throughput - 4.5 m 2 / h;
• Head - 48 m;
• Suction height - 8 m;
• Receiver - 60 l;
• Weight - 36 kg.

Less productive unit than the above model. It is characterized by the presence of a removable receiver, which saves the number of motor starts and reduces energy consumption.

It is a household booster and is used for water intake from wells and wells.

Advantages of Grundfos Hydrojet JP-5:

• quality materials and coatings;
• the accumulator membrane is made of food-grade rubber - tightness, quick dismantling and replacement, work with drinking water, whose properties it does not affect;
• fast and effective absorption from depth;
• reliable anti-corrosion properties of the body, for which a special chromium-nickel alloy is used, and an additional protective coating;
• the possibility of installation in warm rooms, where t 0C air reaches 40;
• adaptation to warm water - up to +55 0 С.

Specifications:

• Power - 0.775 kW;
• Head - 40 m;
• Suction depth - 8 m;
• Receiver - 24 (60) l;
• Weight - 17.1 kg.

Pumps "MQ"-series

Productive devices, the delivery set of which includes sealed membrane receivers and other standard devices that make the pumping station an autonomous self-regulating mechanism.

Grundfos pumping station MQ 3-35

The unit is easy to get started with: easy to install, requires minimal knowledge and user intervention, which can monitor its operation through an electronic display with a visualization function. Provides low power consumption, does not create strong noise, so it can be installed near the rooms where adults and children sleep.

Advantages:

• reliable automation, the risk of failure of which is minimal;
• visual electric control panel for operating modes;
• multi-stage pressure adjustment in the control relay;
• tooling check valve, which does not allow liquid to exit the device;
• hermetic capacious hydraulic tank, which reduces the frequency of switching on the motor, extends its service life and reduces the overall power consumption of the station;
• complete set with 2-meter electric cable;
• compactness - the device can be installed on a small support, mounted under a sink or sink;
• the motor is not afraid of overheating - periodically (every half an hour) it is cooled due to the water flow;
• low noise;
• correspondence technical parameters and material equipment to all international sanitary and hygienic safety standards;
• availability of original spare parts, which extend the already high production life of parts.

Specifications:

• Electric motor - 0.85 kW;
• Throughput - 3.5 m 2 / h;
• Head - 34 m;
• Suction height - 8 m;
• Receiver - 60 l;
• Weight - 13 kg.

Leading world experts unanimously declare that no analogues of this model have been created in the entire history of automated pressure devices. It performs a huge range of user tasks - from watering a house or utility room to irrigating crops, providing water to farms and filling large containers. It rationally uses energy resources and turns on only when the pressure drops after the intake a large number water. Turning on the crane for a few seconds does not initiate the engine start, and thus saves costs.

Peculiarities:

• pumping clean and lightly polluted water, including rainwater without pollutants;
• orientation only to warm water - up to +35 0 С;
• hydraulic part in steel version;
• protection against dry running in case of accidents in the system;
• motor thermal protection - a reason not to worry about intensive work;
• equipment with a backstop valve;
• high class of electrical protection and isolation of electronics.

Specifications:

• Electric motor - 1 kW;
• Throughput - 3.6 m 2 / h;
• Head - 45 m;
• Suction height - 8 m;
• Receiver - 0.4 l;
• Weight - 17 kg.

Complete pumping station "Grundfos" Scala2

One of the latest developments of the company, which, according to experts, met the expectations of consumers. It will be a good option for a private house. Generates a high pressure that will remain stable while the washing machine, washbasin and shower are operating at the same time. You can see her device below.

Advantages:

• stable pressure characteristics that do not depend on the number of water intake points (maximum - 8);
• dry running protection;
• emit little noise at a level of 47 dB;
• suction of water from the 8th depth;
• the possibility of installation on the street, if t 0 C air does not fall below 0;
• easy control.

Technical parameters "Rock 2":

• Power - 2 kW;
• Feed - 3.6 m 2 / h;
• Head - 45 m;
• Suction - 8 m;
• Receiver - 0.65 l;
• Weight - 10 kg.

What should I do if the Grundfos pumping station turns on frequently?

Among several options for malfunctions, this is one of the most common.

It may arise due to:

• depressurization of the receiver membrane - due to the ingress of foreign debris or wear;
• lack of compressed air in the accumulator and insufficient pressure in the latter;
• damage to the check valve, which has ceased to fulfill its holding function.

All these breakdowns require immediate repair. Their correction can
do it yourself, but it is better to entrust this matter to specialists.

Reading 7 min.

Pumping stations as an alternative to the classic productive pump are very popular despite the higher cost of this class of equipment. Segment leader pumping equipment in the global and domestic market is the Grundfos brand.

Grundfos pumping stations are distinguished by reliability, durability, uptime, and their technical characteristics are higher than those of their counterparts.

Types and differences of Grundfos pumping stations

The main purpose of a pumping station as part of a heating or water supply system is to increase the pressure in the system and ensure efficient water intake from a source or reservoir. A classic pumping station consists of a pump, which often includes a diffuser, a pressure or storage tank (obsolete modification), a membrane, a pressure switch, a pressure gauge, cables for connecting and grounding the unit.

Depending on the purpose and operating conditions of the pumping station, it can be equipped with a submersible, surface or borehole pump.

Grundfos pumping stations are mainly equipped with a hydraulic accumulator, or a pressure tank - in such a system, the pressure is maintained at the level set by the settings. Inside the pressure tank body there are 2 chambers for water and air, respectively, separated by a membrane. Turning the pump on and off is automatically adjusted as the water chamber of the accumulator is filled to the maximum allowable value. When the system is turned on, water is first of all consumed from the pressure tank, then, as its level decreases, the pump for the main source is automatically turned on.

Grundfos complete pumping stations are also classified according to the principle of operation of the pump, the ejector of which is:

• built-in - such models carry out the rise of water as a result of rarefaction and work at a depth of up to 40 m, the disadvantages include high level noise and significant cost;
• remote - downhole and well pumps, operating at a depth of up to 20 m, the design includes 2 pipes, one of which ensures the movement of water in a downward direction, due to which the pressure level and the suction capacity of the second pipe begin to increase.

Advantages of pumping stations

The Grundfos water pressure booster pumping station, regardless of type and configuration, has increased resistance to mechanical wear due to its use in the manufacturing process high quality materials And modern technologies. The service life of the station under the conditions of timely maintenance reaches 10 years or more.

Professionals also note that the products of this brand:

• resistant to loads and works in uninterrupted mode;
• has a low noise level;
• economical due to low power consumption.

The lineup

The range of Grundfos pumping stations is diverse - among the models presented in the corresponding market segment, it is easy to choose equipment for any budget and for the implementation of any project.

We offer short description popular series of pumping stations produced by this brand, as well as recommendations for choosing the optimal model.

JPA

The JPA series of equipment is designed for pumping clean water from foreign inclusions and abrasive particles. The design is based on the JP self-priming pump, inner surface pressure tank is coated with an anti-corrosion coating. Each model is made in a cast-iron case and has an advanced impeller made of composite material, used to attack the pressure in the water supply system, garden irrigation systems with a maximum suction depth of up to 9 m.

The series includes the pumping station Grundfos JP Basic 3PT, GrundfosJPA3-42 PT-H and Grundfos JPA 4-47 PT-H, operating in the temperature range of 0 ... 55 and 0 ... 35 ° C, respectively.

CMB/CMBE

Grundfos cmb is a series of automatic self-priming units, the main components of which are a pump type CM, an automatic control unit PM1 or PM2, and an electric motor. The equipment operates at a depth of up to 8 m and is mainly used in the field of water supply for the household sector.

The Grundfos cmbe equipment series, unlike its predecessor series, is also equipped with a built-in one, which, as the water consumption parameters change, transmits a signal to the engine and adjusts its speed.

Most popular models:

• Grundfos cmbe 3-62 is a compact model with a low noise level, working with a pumped medium in a temperature range of -20 ... +55 ° C.
• Grundfos cmbe 5-62 has slightly more weight and dimensions than the 3-62 model and provides a nominal head of 44.2 m (3-62 - 39.4 m).

Hydrojet JP

JP is a series of garden pumping equipment and organizing a water supply system in a summer cottage, designed to pump and fill tanks / tanks with clean water, which does not include abrasive and fibrous inclusions.

All models of the series are equipped with ejectors that can be turned off if necessary, creating a vacuum with HydroVacuum pumps and operating at a depth of up to 8 m. They are distinguished by a long service life due to the fact that the main parts of the equipment (body, wheel shaft, fittings-connectors) are made of stainless steel. Horizontal single-stage centrifugal stations of this series are equipped with

Sub series:

• pump Grundfos JP 5 - self-priming surface unit, providing a maximum head of up to 40 m and capable of operating in a temperature range of 0 ... 55 ° C;
• Grundfos JP 6 - unlike its predecessor HydrojetJP 5, it provides water lifting to a height of 48 m and has a large external dimension.

Both sub-series are represented by models of different performance, which is also displayed in the marking. For example, the GrundfosHydrojetJP 6-24 model is equipped with a 24 l tank. There is an analogue with the same tank volume in the JP5 sub-series, but the 6-24 model has an increased power of 1400 W and is capable of raising water to a level of 53 m, due to which it is also used in equipping 2-storey cottages.

MQ

Household pumping stations Grundfos MQ 3-45 and 3-35 are used to automatically increase the pressure in the water supply system in a private house or apartment, to complete watering and irrigation systems, to pump clean or rain water.

The units are completely complete, they raise water from a depth of up to 8 m and provide a head of up to 43 m with minimal energy consumption.

Benefits also include low noise levels, dry start protection, automatic reset and restart, a small pressure tank that reduces on/off cycles, and low maintenance requirements. Permissible temperature range of the pumped liquid - 0 ... 35 o C.

Grundfos mq 3-35 and 3-45 pumping stations (video)

VdS

The Grundfos fire extinguishing system cannot be ignored. It is equipped with a single suction pump with a short or long coupling and is connected to an electric or diesel engine. The impeller of the station is made of bronze, and all contacting components are made of wear-resistant stainless steel. All this is enclosed in a strong and durable cast iron housing. Fire extinguishing systems are used in equipping industrial and production sites, storage facilities, office and business centers.

Characteristics

The key characteristics when choosing a pressure station are pressure and performance. It is they who determine whether the equipment can meet the demand, depending on the number of users and water consumption.

The performance of the pumping station directly depends on the pressure, or pressure level inside the system. So, for using taps, a pressure of 3-4 l / min is sufficient. at nominal pressure in 2 atmospheres, and for uninterrupted operation, the pressure force should already be 12-13 l / min.

When choosing a model, pay attention to the fact that every 10 m of pipeline length is 1 m of pressure. For example, you need a pump to lift water from a depth of 7 m, and the distance from a well or other source of water directly to the pump is 30 m. In this case, the maximum suction depth of your chosen model should be at least 10 m (7+30/10) .

Like many European companies, Grundfos boasts interesting history her formation. From a small workshop, this monster has turned into an extensive network of factories and representative offices throughout Europe. By the way, in Russia, in the city of Istra, their plant also operates and produces products of excellent quality. But the most important thing is that the manufacturer, when building a plant in some country, offered its population not only standard pumps and pumping stations, but also models that were adapted to the conditions of their operation in that particular country. And although the prices at Grundfos bite, their products are very popular due to their high quality, complete set and trouble-free operation. It should be noted that the Grundfos pumping station is the very first model that appeared in the world as a separate type of equipment.

Design features

Let's start with the fact that the Grundfos pumping station includes a centrifugal pump and a hydraulic accumulator. Basically the same as other brands. of this type equipment. But she also has her own distinguishing feature- this is an ejector, which is included in the design of the pump, as an integral part of it. That is, it turns out that this device is located in the pump housing.

The ejector makes it possible to increase the depth of water intake. Without it, the pumping station can pump water from a depth of no more than 10 m, with it this value increases to 50 m. And although many experts are sure that an ejector lowered into a well shaft works better in terms of efficient water intake, Grundfos denies this.

In addition, stations with a built-in ejector are practically not susceptible to sand and other small debris in the water - there is no need for filtration. A constant and uniform pressure will be another advantage of this design. The only drawback is the increased noise level during operation. But given that the pumping stations are located outside the house (caissons) or in the utility room, then such a drawback is insignificant. Therefore, the products of this brand are very popular in the arrangement of great depth.

As for the completeness of the station, Grundfos provides the pump with all necessary elements and nodes. That is, it includes the unit itself, a check valve, a strainer and a sleeve that will be lowered into the well, a pressure switch, a pressure gauge and connecting fittings. The absence of one of the elements is not allowed.

The automation unit, which controls the operation of the pumping unit, consists of a pressure gauge and a relay. The first monitors the pressure inside the plumbing system, the second turns off or turns on the pump when the water pressure rises or falls, respectively. At the heart of the relay design there are two springs: one large, the other small. The first responds to low pressure in the accumulator, including the pump. The second to high, turning it off.

Grundfos pumping station pressure switch

Principle of operation

The Grundfos pumping station works quite simply.

• The pump pumps water into the accumulator, which enters the pear-shaped rubber membrane. It expands under the influence of water. But between the membrane and the walls of the metal tank, air is pumped under a pressure of 1.5 atm. It also provides pressure inside the water supply network. When pumping, the air pressure increases to 4.5 atm.
• The pump turns off, and water from the accumulator under pressure begins to be supplied to the water supply network of the house. As soon as the pressure inside the water supply drops, the automation turns on the pump, which again pumps water into the membrane.

The principle of operation of the pumping station

The lineup

It should be noted that even the most demanding buyer will find the necessary model of a pumping station for himself, which will effectively provide water to any house with a different number of consumers. The main thing is to correctly calculate the required water flow.

Water stations

One of the very popular models is the Grundfos MQ 3-45 pumping station. Speaking about its technical characteristics, we can say that this unit can provide enough water big house. After all, its productivity is 3 m³ / h. And this despite the fact that it can pump water with a head of 27 m - this is a nominal figure. Maximum - up to 45 m.

But, most surprisingly, the pump motor has a power of 1.0 kW. That is, giving out such a decent power, the device consumes a minimum of electricity.

Grundfos MQ 3-45

Another representative of this model with lower technical characteristics. This is a Grundfos MQ 3-35 pumping station. Its performance is exactly the same as that of the previous model, but the maximum head is 35 m, with a suction depth of 8 m. But it has a lower power consumption of electricity - 0.85 kW. That is, the company makes it possible to choose the unit that will supply water to required quantity, no less and no more, but you do not have to overpay for equipment. This is very important in terms of economy.

True, this model has a housing function. That is, the pump, and it is self-priming, after an unexpected emergency shutdown, it will itself try to turn on every 30 minutes. For example, the water level in the well has fallen. After half an hour, the pump will try to pump water. If the level has not risen to the required level, then the unit will turn off again. And it will turn on in half an hour. But after 24 hours, the function will turn off if the emergency is not corrected. After that, the station will have to be turned on manually. This is a kind of protection.

Attention! All models of the "MQ" series are small-sized, which includes a multi-stage self-priming pump.

But the Grundfos Basic 3-50 pumping station in its composition has a more capacious accumulator with a volume of 50 liters. All other characteristics are the same as the previous models. Of course, a capacious tank reduces the number of switching on and off of the pumping device, which increases its service life.

Now we need to consider several models from the Hydrojet series, which includes a single-stage pump of the JP brand. It has a fairly wide range, in which there are both small pumping units and powerful ones. The latter can provide water to large houses or several small ones.

Pump station Grundfos Basic 3-50

So, the first representative is the Grundfos Hydrojet JP 5-24 pumping station. This is the smallest representative of its class, which includes a JP series pump and a 24 liter hydraulic accumulator. With a small electric motor with a power of only 0.75 kW, it can drive up to 3 m³ / h of water through itself, raising it to a height of up to 48 m. The water intake depth is 8 m, it creates pressure up to 6 atm inside the water supply system. With small installation dimensions, these are excellent technical characteristics.

The next more powerful model is the Grundfos Hydrojet JP 6-50 pumping station. It has a built-in ejector in its design, and it has an additional pressure boosting function. For all other indicators, this is still the same pumping station. It has a larger hydraulic tank volume - 50 liters and increased power - up to 4.2 m³ / h. Of course, with such a performance, the pump consumes more electricity - up to 1350 watts.

Sewage pumping stations

In the model line of Grundfos pumping stations there are also sewer installations. With their help, you can pump storm, fecal, drainage, industrial and ground drains. Since the unit itself and the hydraulic accumulator collide with rather aggressive liquids, their design includes parts and assemblies made of high-strength materials.

True, it should be noted that sewer stations of this type are practically not used in personal plots. They are expensive, and there is no need to use such advanced installations. Instead of them for sewerage country house you can use the pumping station Grundfos JP Basic 3pt. With small dimensions, this installation has a fairly high technical characteristics. But it will also look inappropriate in the sewer system. It is easier to install a conventional fecal pump. But you need to know that Grundfos also produces sewer units.

Pump station Grundfos JP Basic 3pt

Installation rules

All the models described above are an insignificant part of what the Danish company offers. But for all units there are certain strict requirements for installation and operation. Namely:

• Experts recommend installing pumping stations near the source of water intake. The closer the better, so the caisson - the best option installation locations.
• All pumping stations should operate only at positive temperatures of the ambient air and pumped water. Therefore, they are best installed in caissons, basements or insulated extensions to the house.
• The appliance itself must be installed on a level and solid foundation. Be sure to put under it rubber gasket, which will reduce the resonance of the installation.
• Since domestic power lines cannot guarantee a stable voltage outside the city, it is imperative to connect the pumping station through a voltage stabilizer. In this regard, they are very capricious.

Installation rules

As for the positive operating temperature, it should be noted that the pumping stations installed in the basement or caisson must be connected to hydraulic structure pipes or hoses, which must also be insulated. Therefore, the pipeline can be laid below the level of soil freezing or the route will have to be insulated using special thermal insulation materials. Usually today, cylinders (shells) made of foamed polymers are used for this.

Very important point is to choose the right pipe connection to the station itself. Each model has its own inlet diameter, so the diameter of the pipe must match it. If not possible, then you will have to install an adapter. True, experts do not recommend installing pipes smaller or larger diameter, this will affect the pressure inside the water supply.

Installation location

Model differences

So, when it comes to household pumping stations from Grundfos, it must be said that the manufacturer offers two groups: Basic and Hydrojet. They differ from each other only in the material from which the body of the unit is made. In the first group it is an aluminum alloy, in the second - stainless steel.

By the way, as mentioned above, the models of the Basic group can be used for pumping water with a high concentration of pollution. That is, they can organize the irrigation of green spaces with water intake from open reservoirs or pump out wastewater.

True, there are also pumping units made of cast iron in the Basic series. For example, Grundfos JP Basic 2 PT. This is the smallest design, weighing only 18 kg. Therefore, it is easy to carry around the site to any place. The mobile version, although small in size, has excellent performance characteristics. Productivity 3 m³ / h, lifting height (head) up to 40 m, suction depth - 8 m. Such installations are usually used in summer time. They are mounted in the spring near a well or well, and in the fall they are dismantled and cleaned in a house or barn. Most importantly, it takes a maximum of half an hour to connect or dismantle.

Filling the station with water

Today, complex systems such as pumping stations are used everywhere and are replacing conventional pumps due to their ability to automatically uninterrupted water supply. Installation of a pumping station is a simple, convenient, reliable and cost-effective arrangement of a water supply system.

The best-selling segment of the water supply market is the pumping stations of the Danish company Grundfos.

1 Why are Grundfos pumping units among the best?

For the water supply system today, the buyer is offered a wide selection of pumping equipment from various domestic and global manufacturers. Among them, the leading position is occupied by the Grundfos trademark, which manufactures and produces over a dozen different models. pumping units.

A pumping station (PS) is a complex system consisting of a surface pump, a sealed storage tank divided into two compartments by a membrane (hydraulic accumulator), connected to the pump by a flexible hose, a pressure switch, and a control unit.

The pump takes water from an open source and supplies it to the accumulator under pressure. When the pump is turned off, water is supplied from the reserves stored by the accumulator. After the pressure in it drops to a predetermined level, the relay starts the pump. Then the cycle repeats.

Also accessories are: engine, pressure gauge, hose high pressure, connecting link - a control unit that connects the elements. Some models are used as injection units in order to increase the pressure of the liquid in the system. A stable pressure of about 1.5 atm, which creates a good pressure in the water taps on the upper floors, is received by the consumer with the installation of a Grundfos pumping station.

The role of the pumping unit is to provide the consumer with a constant supply of water to the points of intake and maintain the proper pressure in the autonomous water supply. Due to the content of not a submersible, but a surface pump, the device allows servicing wells with a small diameter, for example, a needle well, for which standard units are not suitable. These systems operate, as a rule, with a depth of 8 m. Devices equipped with an ejector pump water from a depth of up to 30 m.

Technical characteristics such as fence height, power, storage capacity and productivity are the strengths of Grundfos products. Power, a fundamental indicator, of pumping units ranges from 600 to 1500 watts. Dry running control, built into some models of the brand, provides for turning off the pump when there is no water in the supply system, protecting the engine from overheating. This feature also stops the HC operation when the unit is operating at high speed, thus facilitating its long-term use.

Pumping stations are equipped with an automatic control system, which is an additional convenience for continuous operation in a private house. It turns on the device if the accumulator is empty, and turns it off when the tank is full. Grundfos units are designed for the presence of various contaminants in the liquid and problems with the power grid.

1.1 Benefits and applications

Automated equipment is used in the following areas and areas:

• in industrial buildings;
• in hospitals;
• in farms for the purpose of watering and irrigating horticultural crops, green spaces;
• in firefighting. This is the aggregate engineering communications from working and reserve centrifugal pumps, manifolds, control and shut-off valves, automation and control devices, control cabinet;
• in areas of flooded lowlands to remove water;
• in the sewer for raising wastewater to an elevation;
• in oil fields, in the oil and gas industry, special BPS are used - booster pumping stations;

The greatest distribution of the National Assembly received in the water supply systems of cottages, country houses, plots.

Advantages:

• undemanding in certain care and constant supervision;
• structural strength due to high-quality and strong material of execution of all hydraulic equipment units;
• energy efficiency;
• noiselessness (samples with an ejector);
• good lift height and pressure;
• high volume flow;
• operational safety;
• ease of installation and dismantling;
• low operating and maintenance costs;
• long service life;
• mobility and reliability;
• anti-corrosion coating and others.

2 Overview of popular models

The popularity of Grundfos pumping stations provides an affordable price and high quality. They have earned a good reputation, tested with success in difficult operating and climatic conditions. The main products of the company are NS of the Hydrojet and Basic series. The equipment of the two lines is the same in many respects - the design solution and the principle of operation, the difference lies in the material that was used in the development of the unit body. The Hydrojet series pumps are made of stainless steel, the Basic range is made of aluminum alloy.

Grundfos JP Basic series systems are easy to use and do not require constant monitoring. pressure tank and pressure switches contribute to the rational operation of the hydraulic structure. When turned on, the container is filled, during subsequent use, liquid enters the tank as it is emptied, so the device turns on and off as needed, contributing to the economical mode and preventing accelerated wear.

In addition to providing water, the models of this line perform the tasks of pumping wastewater and organizing irrigation. They supply water to a height of up to 7-8 m at a speed of 3 cubic meters and are designed to operate at positive temperatures.

The Grundfos JP Basic 3PT pumping station has a large capacity with a maximum capacity of 3.7 cubic meters per hour. The pressure is 44 m and is achieved due to the pressure in the hydraulic system of 7.5 bar and at the inlet - up to 3 bar. Refers to mobile and light equipment, the total weight is 17 kg. The noise level does not exceed 55 dB. A tank of 20 liters allows you to independently adjust the working rhythm.

Grundfos Hydrojet JP is a reliable and robust series with internal and external protection from corrosion. Automatic on / off allows consumers to save energy consumption. In conditions of unstable water supply, Hydrojet products are protected from overloads. The Hydrojet JP 5 24 l booster pumping station is a model designed to supply water to residential premises, but most often it is used as a pressure booster station in a centralized water supply system.

With a tank of 24 liters, it is proposed to automatically adjust the pump, which independently starts to reduce the pressure level in the accumulator. The unit operates with a power of 750 W, lifting water to a height of 43 m. The Grundfos JP 5 pump produces a capacity of 35 l / min.

Grundfos Hydrojet JP 6 24 is characterized by an increased power of 1400 watts. The lifting height reaches 53 m. This allows the NS to be operated in two-story buildings. The device is easily portable as the size of the tank allows it to hold 24 liters of liquid. A fully equipped pumping station is ready for use, it is enough to connect it to the system, the workflow is carried out automatically.

The Grundfos CMBE pumping unit is equipped with a frequency converter, due to which pressure is constantly maintained at the liquid intake points, regardless of the number of consumers. The pressure sensor transmits a signal to the frequency converter when the need for water consumption changes, in turn, the converter corrects the rotation of the impellers. Compact design has a 2-liter membrane tank, fitting with 5 positions and a check valve, pressure gauge.

CMBE is easy to install and has low power consumption, dry running protection. Its operation is carried out with a low noise level. Used in domestic water supply, commercial buildings. The Grundfos CMBE 5-62 model belonging to this series gives a head of 44.2 m at a nominal flow of 5.6 m3 / h. Pressure - 10 bar. Grundfos CMBE 3-62 preceded the said pumping station and is in many ways similar to its "adept". Its flow rate is 3.7 cubic meters / h, head - 39.4 m, storage tank holds 2 liters.

Also supplied with dry running protection is the Grundfos MQ 3-45. In addition, there is protection against overheating and frequent switching on.

The installation supplies water from shaft wells, wells and reservoirs from a depth of 9 m, it can be used as a device with which the water pressure will increase. Head - 45 m, volumetric flow is 4.4 cubic meters / h. The power consumption is only 1kW. NS is the quietest among analogues. Monoblock construction.

2.1 How do grundfos mq 3-35 and 3-45 pumping stations work? (video)

2.2 Other stations

Other hydraulic equipment of the Danes are no less in demand. For example, based on centrifugal pumps of the CM series, professional installations water pressure booster Grundfos CMB with a tank of 24 liters. Grundfos CMB demonstrated reliability with stainless steel self-priming pumps. They are protected from cycling and dry running.

The Grundfos fire extinguishing station includes Hydro MX 1/1 CR10-3 with 1 main and 1 standby units. Serves both in sprinkler and deluge modes. The Grundfos complete pumping station is characterized by an automatic transition to a backup power supply line, remote control of electric valves, a 25-liter membrane tank. Outlet pressure 16 bar.

Among the popular devices, it is also worth highlighting the pumping stations Grundfos MQ 45, Grundfos JPA 4-47 PT H, Grundfos JPA 3-42 PT H.

Reading 7 min.

Grundfos equipment (Grundfos) due to its reliability, performance and ease of operation are widely used in all industries.

They are used in the field of housing and communal services in the construction of centralized heating mains, water supply, sewage drainage, servicing agricultural and forestry enterprises, as well as in equipping industrial complexes.

The main types of problems

Timely maintenance of a pump or pumping station for any purpose is a guarantee of its correct operation and the durability of the system as a whole. Repair of pumps in a specialized service center, for example, in Sergiev Posad, is initially an expensive pleasure. However, if you are familiar with the device of the unit and understand the principles of its operation, it is quite possible to eliminate malfunctions on your own.

Device and principle of operation

The Grundfos range is represented by all major categories of pumping equipment:

• downhole;
• sewer;
• centrifugal;
• circulation;
• multi-stage self-priming installations.

Borehole pumps are used in the water supply system and in the arrangement of wells with artesian water, for filling tanks and other water distribution systems. As a rule, this deep installations operating in continuous or short-term mode, adjustable and hydraulic tank. The product package includes three main elements - an engine, a built-in filter and an upper or lower water intake system. Products are represented by the SP, SQ and SQE equipment series.

Consider the design of Sololift sewage pumps, using the example of a typical Sololift 2 WC 3 unit. The installation consists of a tank equipped with inlet / outlet holes, into which waste water. After pre-cleaning provided by the filtration system, and upon reaching a certain level, which is controlled by the Grundfos level sensor, the pump turns on automatically. Thus, the process of pumping liquid into a centralized highway, septic tank or other disposal tank is started. The unit is also equipped with a shredder that processes large household waste and prevents clogging. sewer pipes. The simplest installation is capable of lifting water to a height of up to 5-7 m and transporting it 100 m in a horizontal plane.

Monoblock centrifugal pumps The NB series are characterized by a one-way suction system and are used in water supply, heating, ventilation, air conditioning and irrigation installations. The torque from the engine is transmitted to the rotor impeller, liquid enters the central part of the unit. As the blades rotate, water or another carrier of thermal energy, if we are talking about the heating system, is thrown towards the external elements of the housing and redirected to the outlet pipe under the influence of centrifugal force. The pressure indicators inside the system are regulated by the Grundfos level sensor.

Circulation pumps, represented by the UP, UPS, UPSD, Alpha 2 equipment series, are equipped with a wet rotor and are intended primarily for completing a closed-loop heating system. Its functioning is based on the centrifugal force generated by the impeller placed on the shaft. When water enters the central part of the rotating wheel from the suction pipe, it is thrown into the peripheral sections of the unit. The advantage of the equipment of this series is the automatic cooling of the rotor, which rotates directly in the pumped medium. It is still recommended to entrust the heating pump with a wet rotor to professionals.

In the segment of self-priming equipment, Grundfos MQ 3-35 is the leader, used in the configuration of a pumping station with a membrane expansion tank. The circulation of water is stimulated by an increase in pressure due to the centrifugal force that occurs during the rotation of the impeller. When it is displaced from the peripheral compartments of the installation into the discharge pipeline, the pressure in the central part of the impeller decreases and the liquid enters the pump casing. Such models are used to increase pressure and as part of supply systems. pure water(drinking or technical).

Common types of faults

A pump failure occurs, as a rule, suddenly and is caused mainly by incorrect operation, which also needs to be given a little attention. It is advisable to entrust the installation of Sololifts, for example, and similar high-performance equipment and the first inclusion to specialists.

Before connecting the submersible or surface pump to the mains or to a hydraulic accumulator, it is necessary to check whether there is liquid in the area where the intake device is located and in all pipelines of the system - with a “dry” start, the pumping station will fail with almost 100% guarantee. The volume and temperature of the pumping water must be in accordance with the performance specifications and manufacturer's recommendations.

When the pump is idle for a long time, for example, when used in a country house or in a non-residential country house once a month, it must be turned on for 15-30 minutes to prevent oxidation of moving parts.

Despite the differences in design and principle of operation, the following types of malfunctions are typical for most types of pumps:

• lack of torque;
• premature spontaneous stop of work;
• increased noise level;
• increased vibration;
• insufficient pressure;
• stop after start.

Causes of problems

The lack of torque while the installation is buzzing indicates shaft oxidation as a result of long downtime equipment or contamination of the system with foreign insoluble or coarse-grained elements in the composition of the pumped liquid. In both cases, cleaning can eliminate the malfunction, less often it is necessary to measure the rotor shaft or the entire engine. If the pump does not rotate and does not make noise when turned on, the power supply and voltage parameters must be checked.

When the pump randomly switches off after a short time after starting, the problem is most likely caused by excessive lime and salt deposits in the space between the rotor and the starter. The problem is also solved by cleaning, which requires first shutting down the system and dismantling the engine.

A high noise level when turned on indicates the presence of an excess amount of air in the pipelines, which is enough to bleed with a simultaneous increase in inlet pressure. Sololift repair in this case is not required.

The increased level of vibration is due to the fact that the bearing, which is equipped with the pump in some models, has become unusable and needs to be replaced.

Pressure defects occur if the viscosity of the pumped liquid is higher than the throughput of the pumping station, which is eliminated by replacing a clogged filter. Another reason is the wrong implementation three-phase connection. This is also often the reason why the equipment stops almost immediately after it is started.

The causes of breakdowns also include uncontrolled external factors - freezing of liquid in pipelines in case of insufficient insulation or abnormal climatic phenomena and water hammer on dry start.

Stages and rules of repair

Repair of the Sololift pump, like Grundfos for any purpose, can be done independently, after identifying the source of the problem.

Equipment diagnostics involves several stages:

• start the pumping station, evaluate the level of noise and vibration;
• check the pressure indicators;
• make sure that the motor does not overheat during operation;
• check the presence and quality of lubrication of nodal connections;
• make sure the integrity of the structure and the absence of leaks;
• inspect the box for secure fastening of the terminals.

If you are sure that the malfunctions are not caused by lime deposits and pollution, overloads or operation at maximum capacities, the pump can be disassembled. When planning a Grundfos pump with your own hands, make sure that water is drained from the pipelines and turn off the system. Disassembly begins with the junction box and a visual assessment of the components. As a rule, such an inspection makes it possible to immediately detect a burnt or worn part. If not, we will continue to disassemble the installation.

The engine must be in vertical position . This will prevent the risk of oil leakage. To diagnose the trigger mechanism, an ohmmeter must be connected to the engine. This tool, when the handle is rotated, generates a voltage in the range of 200-300 V, sufficient to take readings on the resistance determination device. Too high diagnostic data, reaching infinity, indicate a break in the working phase, too low - an interturn circuit. Self-adjustment of operating parameters with such deviations is not possible.

Grundfos circulation pump: repair review (video)