The membrane tank is needed to protect engineering system From hydrowards and fully ensure its quality work. After the acquisition of the equipment you need to think carefully , how to install a membrane tank so that it worked without failures. The hydroaccumulator in water supply performs several functions: accumulates the supply of water, supports in the system required pressureThe reserve to reduce the inclusion frequency and turn off the pump.

Without installation of the membrane tank, the service life of the pump is significantly reduced. In the system provided by the hydroaccumulator, water can be dial even when the electricity is turned off. During the first launch of the pump, the water chamber water chamber is filling. The larger the volume of water in the tank, the less air volume and above the pressure. Having achieved a given pressure indicator, which is necessary to disable the pump, it is automatically shutdown. As soon as the pressure in the system falls to permissible levelThe water supply will immediately turn on. To check the pressure on the hydroaccumulator, a pressure gauge is installed. It is also necessary to configure the required range of equipment operation.

Before you begin connecting the hydroaccumulator to the water supply system:

• Carefully examine the instructions attached to the equipment.
• Spend technical calculations Pressure and compare with the instructions specified in the regulatory reference.
• To carry out a high quality installation, you need a key for detachable compounds and pipes from plastic, desired size wrench.
• For fixing the equipment of large volumes, special brackets will be needed.

Measures and calculations of the equipment operated should conduct a highly qualified specialist. The quality of the water supply system depends on the accuracy of the calculations and measurements.

Many years of experience in the water supply of membrane tanks showed that horizontal models are the best option. If you are connected submersible pump, Purchase and install vertical hydroaccumulators.

1. The tank must be installed in accessible to maintenance place.
2. When installing, it is necessary to envisage the possibility of dismantling the pipes of the system if necessary.
3. The diameters of the pipeline and the coupling should be coincided.
4. Be sure to install the pressure gauge to control the pressure in the system.
5. Should also calculate and install shut-off reinforcement.

Between the pump and the hydroaccumulator, it is impossible to connect elements affecting hydraulic resistance.

Installation of the membrane tank spend only at the plus temperature. For convenience of pressure regulation, the air valve is installed in the available area. The same rule concerns and connect the drain crane, a liner and both types of reinforcement.

To avoid unwanted load on the unit, the pressure reducer is to be mounted after connecting the measuring counter. Safety valve Mount should be installed before the running pipe.

Two shut-off valves installed on both sides of the tank will help avoid unforeseen situations. The drain valve is installed in front of the hydroaccumulator.

Setting up the operation of the membrane tank

When mounting work Conducted according to recommendations, it is necessary to configure the operation of the mechanism:

1. By downloading the air, select the desired pressure shown by the manometer.
2. Enable water supply pump.
3. Balance the pressure and give the membrane floating state.
4. Setup completed. Now the water supply system with installed membrane tank is ready to work.

If you purchased a tank with a removable membrane, after some time it can be replaced. To install a new membrane, overcome the bolts on the flange connection, and then remove the flange and outdated membrane. Install the new and back all thoroughly.

Mounting errors that should be avoided

• It is impossible to use seals inequately disabled to perform such works. They very often lead to water leakage.
• The location of the tank must be chosen correctly.
• Mind of the volume of the tank water supply system.
• Incorrect tools for work.
• The membrane tank cannot be opened or reassured, using an effort.

To ensure the normal uninterrupted functioning of centralized water supply systems, such structures are used as water towers or other type drives.

Despite the fact that autonomous systems The volumes and required water consumption is significantly smaller, without installing this type, too, do not do. The role of a peculiar water supply tank is played by an expansion tank for water supply, which, due to its small sizes, can be installed in any heated room.

Installation of this constructive element Water supply systems allows you to solve several technical tasks:

• Creating a specific reserve of water under pressure providing a flow to any point of water intake. The average volume of expansion tank (25-30 liters) is capable of providing one-point consumption within 2-3 minutes.
• Protection of network elements from possible hydraulic shocks, which can be triggered by entering the air system or significant power drops that can cause unstable operation of pumping equipment.
• Reducing the number of cycles on-shutting down the pump, which makes it possible to significantly increase its working resource.

Principle of operation and design of the expansion tank

For the installation of autonomous water supply systems, closed expansion tanks of the membrane type are mainly applied. Structurally, such a tank is a hermetic container separated by a rubber membrane into two parts - water and air. The air in the chamber is under certain pressure, providing the necessary water support.

The principle of the device is quite simple. Water supplied pump installationFills the container, while the tensile membrane reduces the volume of the air chamber, while the pressure in it increases significantly. After the pressure in the expansion tank of the water supply reaches the installed limit, the automation stops the pump.

The supported by the air chamber allows you to ensure water consumption in all points of consumption, while the automation of the pump includes it to work when the pressure drops below the set value. Depending on the operating conditions, you can configure the pressure parameters for the power on and off pumping equipment. The membrane type tank is able to provide a steady confident water consumption even in multi-storey residential buildings.

Types of expansion tanks

The membrane expansion tank for water supply is usually produced in two modifications (depending on the type of membrane used):

• More cheap are models with a stationary membrane. The diaphragm of this type is rigidly attached in the unit of the unit, it is distinguished by consideration with significant elasticity. Choosing such a modification of the tank, it is necessary to remember that when a diaphragm, it will have to change the entire installation, repair or restoration it is not subject to. To protect the inner surface of the tank, its painting is used, its quality depends on the manufacturer's company, but it is not worth waiting for exceptional durability from products whose cost is low. You can find models of vertical and horizontal type of installation.
• Replaceable membrane tanks are considered a more preferred option. Such an aggregate has a collapsible body (equipped with a rejected flange), and the membrane has a bag shape, which ensures the absence of water contact with the inner surfaces of the tank. This ensures a larger working resource of the device.Select expansion tank This type should be based not only at the total cost of the product, but also at the price of components (membranes). It is often possible to meet inexpensive models, membranes for which finding very hard or their cost is large enough. Therefore, when buying, pay attention to this moment.

How without error choose an expansion tank

Cost components are not the only criterion to pay attention to.

The main indicator is the volume of the device, which is selected depending on the following indicators:

• The maximum possible number of start-off cycles for the pump equipment operating. Remember that the smaller the tank capacity, the more often the pump will be included in the operation, which can significantly affect its durability and efficiency.
• The number of water intake points, it is worth considering not only the bath, a shower cabin, washbasin, but also household appliances (Washing or dishwasher and other).
• The total number of people living in the house.
• The possibility of simultaneous water take-off from several points.

All these parameters affect the optimal capacity of the expansion tank.

As exemplary data, experts recommend using the following indicators:

• If the pump performance does not exceed 2000 liters per hour, while no more than 2-3 people live in the house, it is advisable to stop your choice on the unit 20-24 liters with a capacity of 20-24 liters, for example, the Reflex expansion tank.
• If you need to ensure the needs of a larger family (up to 8 people), an aggregate with a capacity of 50 liters is established. In this case, the performance of the pump should not exceed 3500 liters per hour.
• If you need more water consumption, expansion tanks are used, the volume of which reaches 100 liters.

The advantage of modern devices is that now there is the possibility of connecting additional containers to increase the volume of expansion devices. That is, in the event of an increase in the number of family members or the need to increase water consumption due to other circumstances, it is possible to connect an additional tank without disabling the already installed. In this case, the total capacity of the settings will be equal to the total volume of all devices.

So to ensure the needs of a large family, you can purchase expansion tanks for the water supply of the jilex, 25 liters with a capacity.

Experts do not advise preferred cheap installations of dubious manufacturers. Siemifier savings can lead to reservoir of funds in the future. Best to give preference famous companiesAt the same time, make sure that you do not sell counterfeit products under the guise of products of popular brands.

Installation rules for expansion tanks

By type of installation, horizontal and vertical tanks are separated. Differences B. specifications There are no such models, just this category must be considered when installing and connected. The installation of an expansion tank for water supply in principle does not have special difficulties, it can be performed independently (if there is experience in installing water networks).

But when installing, it is necessary to consider a number of rules:

• The unit is established in such a way that access to it is provided to perform repair and preventive work. Therefore, when choosing it is worth considering the size of the room in which the tank will be installed.
• Connections to pipelines should be performed using quick disconnecting threaded fittings (American), it will provide the ability to disconnect from the network if necessary.
• The connected pipeline must have equal or more than the cross section of the receiving nozzle.
• The expansion tank body must be grounded, this will avoid electrocorrosive processes that can significantly reduce the service life of the device.
• Between pumping equipment And the tank should not be any devices capable of increasing the hydraulic resistance of the network.

Installation of the expansion tank can significantly increase efficiency autonomous water supply. But it is worth remembering that a huge role is played by the competent choice and installation, with compliance with technological requirements.

If you are not enough experience in these issues, you should entrust their decision to a professional who can take into account all the nuances and mount the most optimal model of the expansion tank. At the same time, do not try to save on this unit, only high-quality certified installations will be able to serve you for a long time without breakdowns and expensive repairs.

• We offer to buy for drinking water supply systems with delivery, in the online store "Tavago".
• The price for drinking water supply systems from 1115 rubles.
• Read the instructions and reviews about drinking water supply systems.

Expansion tanks for water supply systems or hydroaccumulators apply in feed systems drinking water. They solve the problem of storing a certain stock of water and maintain the desired pressure in the drinking pipeline. Press tanks are used as auxiliary equipment closed water supply systems. In open cones, they are not needed, because there are tanks installed at the top point of the system.
Hydroaccumulator for water supply is a membrane pressure storage closed type. It is a steel welded tank of several liters to several hundred liters. The membrane is located inside the tank, which is usually made of synthetic rubber or elastic rubber. It has a shape of a hollow pear, which is filled with water at an overpressure. The stretched membrane with a complete reserve of water repeats the form of the tank. It is very similar to the old soccer ball with a rubber chamber, only instead of air in the chamber (membrane) is water. Space between the membrane and internal surface The tank is filled under some pressure inert gas, which eliminates the contact of water with the metal of the tank and provides pressure for subsequent water supply to the highway.
A pump that serves water does not work non-stop - he also needs a passage. Therefore, when the consumer opens the crane to gain water, it will be under pressure to come from its temporary storage - the pressure of the membrane tank. So it will occur until the pressure in the system falls below the nominal. And only then the pump is turned on, whose work will ensure the necessary pressure in the system.
Thus, expansion tanks for water supply, automatically performing uncomplicated mechanical work In stock and subsequent supply of water to the consumer, the pumps are saved from premature wear by reducing their launch periods / discs. In this case, the greater the capacity of the hydroaccumulator for the water supply system, the more water stocks there are accumulated and the need for the pump is rapidly. Moreover membrane tanks For water supply is able to provide a consumer with water during power supply interruptions - water from the pressure hydroaccumulator will enter the water tap even without the participation of the pump.
The cost of the hydraulic panel depends on the volume of water, which it can accumulate, and from the manufacturer. It ranges from 1 thousand rubles for models of low capacity up to 50 thousand rubles per tanks with a volume of ½ cubic meter. Therefore, the degree of comfort when using a drinking water supply will be related to the budget, which is allocated to the acquisition of a membrane tank for the water supply system.
Salon engineer Plumbing "Tavago" offers a large component of membrane hydroaccumulators for drinking water supply from leading foreign (Reflex, GWC) and domestic (DZLEKS, VALTEC) manufacturers.

Expansion tank

The devices of both types used in autonomous systems have a similar design and operate according to a single principle. Consider the basic elements of products on the example of an expansion tank for the heating system:

• The main purpose of the tank is compensating for the expansion of the coolant. When heated, water increases in volume, and quite strongly (+ 0.3% for every 10 degrees Celsius). In this case, the fluid is practically not coming around, so that the heated coolant will have a significant pressure on the walls of the pipes, the location of the connection and the locking reinforcement.
• To compensate for this pressure, as well as minimize the effects of hydrowards, an additional reservoir is embedded in the system - an expansion tank. The first tanks had a leakage design, but today the pneumohydraulic models are used almost everywhere.
• Inside such a tank is placed from elastic material. Since the membrane is in contact with the heated coolant, it is made of polymers that differ in resistance to high temperatures - EPDM, SBR, butyl rubber and nitrilcuts.
• The membrane divides the tank into two cavities - the working manner (it hits the coolant) and air. With an increase in pressure in the system, the aircase decreases in the amount (due to air compression), and this compensates for the load on and shut-off valves. Approximately the same thing happens at the hydraulic man - but here the process comes with greater speed.
• With a decrease in the temperature of the coolant, the volume of water decreases, and the air, putting pressure on the membrane, displaces additional volume hot water In the pipes of the heating system.

An example of an expansion tank can serve as a capacity of 35 liters, perfectly suitable for the heating systems of a large house or public building.

Hydroaccumulator

The hydroaccumulator, at first glance, is practically no different in design from the expansion tank:

• The base is the same container of corrosion-resistant steel, only painted in blue.
• Inside the tank is also the membrane - the truth is, somewhat different in form from the expansion tank membrane.
• The internal volume is also divided into two chambers, only in hydroaccumulators the water chamber is inside the membrane, i.e. Completely eliminates the contact of the liquid with the metal walls of the tank.

Yes, and the design is functioning according to a similar principle, although it is used for another purpose:

• When the pump or water supply is turned on by centralized water supply, the camera is filled with liquid under certain pressure.
• If the pressure for some reason falls, the air chamber increases in volume, and water from working chamber Enters the system. This stabilizes the pressure in the pipes, and equipment ( washing machines, dishwashers, etc.) works without failures.
• The second aspect of the operation of the hydroaccumulator is the protection against frequent inclusions. While you can compensate for the selection of water from the system at the expense of the reserve in the tank, the pressure switch will not work, and the pump will not start pumping water. Thus, the technique will be included less often, which means it will work longer.
• A large hydroaccumulator (50, 100 or more liters) is also a stock of water. Yes, long on this stock will not stretch, but with economical spending it is quite possible to survive an accident on a plumbing or a disconnection of electricity, which will make it impossible to work the pump.
• In addition, the hydroaccumulator, like the expansion tank, compensates for the hydrowards.

An example of a hydroaccumulator in the AlphaTEP online store catalog is a horizontal model for 24 liters.

When heated, any coolant expands and increases in size. As a result, the pressure in closed system Heating gradually grows and reaches a critical mark. The membrane expansion tank of the heating system is designed to prevent the destruction of nodes and pipelines due to the extension of the coolant.

The main function of the expansion tank is to optimize the working pressure in the heating system. Closed heating systems cannot work normally if the membrane tank for heating is not connected.

Membrane expansion tank device

Although membrane expansion tanks, depending on the manufacturer and purpose, may differ, but some details remain unchanged in any acquired model. Namely:

• The casing of metal is a prerequisite for the production of tanks is the ability to withstand limit loads without disruption of tightness.
• The membrane - should be highly elastic and capable of reacting to changing pressure associated with heating coolant. At the same time, high demands are presented to the membrane. Usually in the production of the membrane use rubber.

The device of the heating membrane tank for closed heating systems involves the use of tanks with interchangeable and non-remote diaphragms. Each design has both its advantages and disadvantages.

How the membrane expansion tank works

The principle of operation of the membrane expansion tank-drive is based on the use of physical laws. After heating the coolant, the following happens:

• Water or antifreeze begins to expand, the result increases its volume in the system.
• The design of the expansion tank of the membrane type implies its gas filling.
• The membrane is a kind of layer between the gas and the coolant.
• When heated, the fluid, expanding and creating pressure, enters the tank and displaces air or gas.
• After the pressure of the coolant drops the gas pushes the coolant from the tank using the membrane.
• The safety of the safety valve in the heating system with the membrane tank is to discharge the excessive gas pressure in the case of a large extension of the coolant. Pressure reset valve ensures the security of the system in the case of overheating fluid or antifreeze.

For normal operation of heating in the membrane tank, the pressure must be the corresponding top point height. If the tank is installed in two-storey house And the maximum height from the boiler on the first floor to the radiator on the upper 7 meters, then in calculations we accept 0.7 and add 0.5 to it. We obtain initial pressure when the coolant is applied in the system. The resulting coefficient for the tank must be below 0.2. It turns out that the pressure rate in the expansion tank of the membrane type in this case is 1 atm.

Like all heating equipment, The membrane tank needs maintenance. It needs to maintain appropriate working pressure and refueling gas or air from time to time.

Types of expansion tanks of the heating system

Each manufacturer contributes to the design of a closed expansion tank of innovations. But basically all modifications can be divided into several groups depending on the membrane used. Namely:

• The membrane of the expansion tank in the form of a diaphragm. Such a device more resembles a barrel separated by a movable rubber partition. Entering the liquid into its department, fills the reservoir, and after under pressure, gas begins to compress gas, gradually moving the membrane. This device is not always efficient for homes with a small heated area.
• Round membrane balloon tanks. In this case, the air chamber is around the perimeter of the entire reservoir. It surrounds the water chamber. During an increase in pressure, this camera begins to expand like an inflounted rubber ball. The uniqueness of such a device is that it is possible to more accurately monitor the pressure of the coolant, even in closed systems with a small volume of fluid in the pipeline.
• Non-removable membrane. The diaphragm is attached throughout the perimeter. Facial membranes are intended for use in private heating systems and for heating cottages. Limited use and installation in small industrial facilities is allowed.
• Tank with replaceable membrane. Present a hollow pear. Removable membranes are able to effectively work in systems with a large intensity of heat carrier heating and high atmospheric pressure. The advantage of such a device is the ability to replace the diaphragm. The disadvantage is that high demands are presented to the performance of the membrane. Membrane skew is not allowed when it is installed.

The role of the expansion tank in the heating system is not reduced exclusively to the amortization of overpressure. Before choosing a suitable device, it is necessary to determine which purpose it is planned to be planned.

How to calculate the volume of the expansion tank of the membrane type

When choosing a tank, you must pay attention to the following several indicators:

• Range of temperatures considered by workers for the device.
• Elasticity of the membrane.
• Diffusion stability.
• Dynamic indicators.

In addition to these four criteria, it is important to make a pressure calculation in heating system with a membrane tag tank. Data on pressure will help you choose the most appropriate model of the tank. Requirements for the fulfillment of calculations in complex systems of closed type are presented high. Correctly make counting on the following formula:

V \u003d (V SIS × K) ÷ D

The volume of the expansion tank for a closed heating system is according to this formula, the product of the system V SIS system and the coefficient of increasing coolant K (it is 4%) divided into the effectiveness of the tank itself.

D \u003d (Pmax-P NCH) ÷ (PMAX + 1)

P - In this case, it is a reduction in the representation of the maximum and initial pressure. With these two formulas, you can easily calculate and select the desired model.

In addition to standard round Device You can purchase a rectangular expansion tank of membrane type, it is more convenient to operate and has an attractive appearance.

How to install an expansion tank of membrane type

Installing the expansion tank in a closed heating system is quite simple. The only condition for the connection is to understand the basic principles of work. Installing the installation can be followed by the following recommendations:

1. Expansion tank is better to install before and not after circulating pumpThis will help to avoid jumps in the pressure. There are no other restrictions on the installation site.
2. After installation, it is necessary to check whether the operating pressure of the device with the one is necessary. You can simply make a check simple if you connect to set the pressure sensor in the tank when you connect. The sensor measuring the pressure in the tank is installed directly at the input. If the existing indicators do not match the required, it is necessary to reset the air and pump the device again, until the diaphragm pressure does not correspond to the desired one.
3. The expansion tank with a closed heating system is properly mounted in such a way that the intake valve (water nozzle) is directed down. This will allow to merge the coolant, even if the membrane is output. Some models have a coolant level index that allows you to determine whether liquid drains is made from the system completely.

Installing the membrane tank is a prerequisite for mounting the closed type heating circuit. Some boilers are already equipped with such a device, in which case an additional reservoir is allowed if necessary.