Diaphragm tank is a key component of a hydraulic system, responsible for stabilizing pressure caused by changes in temperature and water flow. In modern pressure-boosting systems and water supply installations, it acts as a buffer that balances volume and protects the system against water hammer. Thanks to its flexible membrane or diaphragm, the tank enables compensation for changes in water volume without energy losses or the risk of damage to the installation.
Diaphragm pressure tanks – role and applications
Diaphragm pressure-boosting systems and diaphragm pressure tanks are used in domestic and industrial water systems. Their purpose is to store water and maintain appropriate water pressure throughout the system. In systems where pressure increases dynamically, the tank acts as a shock absorber, limiting water hammer and protecting the fittings. Each pressure tank is factory-calibrated to respond to pressure caused by changes in temperature and water volume.
The use of diaphragm tanks is essential in installations with pumps where domestic water is supplied cyclically. Diaphragm tanks protect the system against pressure overloads and loss of hydraulic stability. They also reduce the frequency with which the pump starts, extending its service life and improving the efficiency of the entire system.
Types of diaphragm tanks and their construction
Types of diaphragm tanks differ in construction, orientation, and purpose. The most common are vertical diaphragm tanks and horizontal diaphragm tanks. The vertical version takes up less space and works well in small boiler rooms, while the horizontal diaphragm tank facilitates integration with a pressure-boosting pump. Both types can be used as diaphragm pressure tanks in pressurized systems.
Membrane tanks are equipped with a flexible EPDM membrane that separates the water from the air cushion. This construction enables safe volume balancing and precise control of water pressure. Each diaphragm tank component is designed to minimize hydraulic losses and extend the service life of the diaphragm tank.
Diaphragm tanks for various installation systems
In practice, diaphragm tanks for water supply installations, for heating systems, for central heating, as well as for cooling systems and solar systems are used. Each has defined operating parameters and an allowable pressure caused by changes in the temperature of the medium. In heating hydraulic installations, a red diaphragm expansion vessel is used, while systems containing drinking water use a white diaphragm expansion vessel that complies with sanitary requirements.
Diaphragm tanks intended for operation at high temperatures are corrosion-resistant and suitable for use with various media. In solar and cooling systems, diaphragm tanks protect the installation against pressure increases resulting from changes in the volume of water or glycol, and also enable safe volume balancing under changing operating conditions.
Diaphragm pressure-boosting systems and pressure tanks – differences and applications
Diaphragm pressure-boosting systems are complete sets consisting of a pressure tank, a pump, and a pressure switch. Their operation is based on the compression of air in the space above the EPDM membrane, enabling efficient water storage and reducing frequent pump operating cycles. Diaphragm pressure tanks are widely used in residential buildings and farms.
Horizontal pressure tanks are often mounted directly with the pump on a common frame, forming a compact set. Where space is limited, a vertical diaphragm tank is an excellent choice because it takes up less room. Types of pressure tanks and their diaphragm pressure-booster capacities are selected according to water demand and the characteristics of the installation.
Selection and maintenance of diaphragm tanks
The selection of a diaphragm tank should be based on the installation parameters and the required diaphragm tank capacity. The right diaphragm tank guarantees optimal water pressure and a longer pump service life. The selection of a diaphragm pressure booster depends on the pump power, the number of water outlets, and the permissible hydraulic losses. In practice, the capacity should be selected so that pressure caused by changes in temperature remains within the system’s tolerance limits.
Regular maintenance of diaphragm tanks involves checking the air pressure, the condition of the diaphragm, and the safety valve. Maintaining the correct balance between air and water enables effective volume balancing and eliminates the risk of cavitation. It is worth remembering that the right tank with a certified EPDM membrane ensures long, trouble-free operation even under demanding operating conditions.
Advantages of using membrane tanks
Membrane tanks and diaphragm pressure tanks are characterized by maintenance-free operation, high resistance to temperature changes, and durability. The advantages of diaphragm tanks include stabilizing water pressure, protection against water hammer, and reduced energy losses. Thanks to the use of a flexible EPDM membrane, the tank’s internal surface does not come into contact with air, preventing corrosion and contamination of domestic water.
In larger hydraulic installation systems, pressure-boosting sets with multiple diaphragm pressure tanks are used to jointly regulate pressure increases and changes in water volume. This solution is not only efficient but also safe and compliant with the requirements for protecting the installation against overpressure.
Diaphragm tanks – product range and available solutions
The diaphragm tank range includes models with various capacities and mounting orientations. Available diaphragm tanks are made of steel, enameled steel, or stainless steel, allowing the solution to be adapted to the specifics of a given hydraulic installation. Pressure tanks storing domestic water are available in capacities ranging from several to several hundred liters, making them suitable for both domestic water systems and industrial water supply systems.
When selecting a diaphragm pressure tank, it is worth considering the diaphragm material, operating parameters, and allowable pressure. A diaphragm tank system with a properly calibrated air valve and pressure safety device guarantees durability and reliability over a long period of use. Diaphragm pressure-boosting systems offered by manufacturers have certificates of compliance with European standards, confirming their quality and operational safety.
Summary – the role of a diaphragm tank in modern installations
A diaphragm tank is an important component of an installation, ensuring stable water pressure, protection against water hammer, and optimal volume balancing. Its construction enables compensation for changes in water volume and effective management of pressure caused by changes in temperature. Both diaphragm tanks for heating systems and diaphragm pressure tanks guarantee high reliability and operational safety. By choosing the right diaphragm tank, users gain a durable and economical solution that supports the proper operation of the entire hydraulic installation.
Frequently asked questions (FAQ)
How does a diaphragm tank work?
A diaphragm tank operates by compensating for pressure caused by changes in the volume of liquid. Inside it is a flexible EPDM membrane separating the water from compressed air. When the volume of water in the installation increases, the air is compressed, enabling volume balancing and stabilization of water pressure. This solution protects the installation against water hammer and excessively frequent pump starts.
What is a diaphragm pressure tank used for?
A diaphragm pressure tank serves as a water reservoir and pressure buffer in hydraulic installations and water supply systems. It enables water storage and keeps it ready for use at a constant pressure caused by changes in flow. It is used in domestic pressure-boosting sets and industrial systems where stable water pressure and pump overload protection are required.
What types of diaphragm tanks are there?
There are vertical diaphragm tanks, horizontal diaphragm tanks, and membrane tanks. Vertical models are used where saving space is important, while a horizontal diaphragm tank facilitates mounting the pump on a common frame. Diaphragm pressure tanks also differ in purpose – they can be adapted for heating systems, cooling systems, or solar systems, depending on the medium and operating temperature.
How do you select the right diaphragm tank?
The selection of a diaphragm tank depends on the diaphragm tank capacity, the maximum pressure caused by changes in temperature, and the type of installation. Domestic water installations typically use tanks with capacities from 24 to 100 liters, while industrial systems may use tanks holding several hundred liters. The right diaphragm tank should be selected to ensure a balance between the amount of stored water and the system’s operating pressure.
How often should diaphragm tanks be maintained?
Regular maintenance of diaphragm tanks includes checking the air pressure in the gas chamber, valve tightness, and the condition of the EPDM membrane. An inspection is recommended every 6–12 months. Maintaining the correct pressure parameters helps prevent excessive pressure increases and extends the service life of the diaphragm tank. More frequent inspections and cleaning are recommended in heavily loaded systems.
What is the difference between a red and a white diaphragm expansion vessel?
A red diaphragm expansion vessel is intended for heating systems and central heating, where the medium temperature may reach up to 120°C. A white diaphragm expansion vessel is used in installations containing domestic water because its interior is made of materials approved for food contact. The choice of vessel color therefore depends on its purpose and operating conditions.
What are the advantages of using membrane tanks?
The advantages of diaphragm and membrane tanks include long service life, maintenance-free operation, and effective protection of the installation. Diaphragm tanks protect the system against water hammer, stabilize water pressure, and enable smooth volume balancing. Thanks to the sealed EPDM membrane, the water does not come into contact with air, preventing corrosion and extending the service life of the entire system.
Are diaphragm tanks needed in every installation?
Yes, in most modern hydraulic installations and pressure-boosting systems, a diaphragm tank is essential. It stabilizes pressure caused by changes in flow and prevents damage to the fittings. Diaphragm tanks intended for water, heating, or cooling systems ensure safe and economical operation regardless of the system’s capacity and the type of medium.
How long does a diaphragm tank last?
The service life of a diaphragm tank depends on the quality of its construction, the membrane material, and the operating conditions. High-quality diaphragm tanks with a flexible EPDM membrane can operate for 5 to 15 years. Regular maintenance and maintaining the correct pressure in the air chamber significantly extend the service life and reduce the risk of failure.
What capacities are available for diaphragm pressure tanks?
Diaphragm pressure-booster capacities range from several to several hundred liters. Small diaphragm pressure tanks are used in domestic systems with domestic water, while large ones are used in industrial and agricultural facilities. Capacity selection depends on the volume of water in the circuit, pump operating frequency, and the demand for appropriate water pressure.
Where can I buy IBO devices?
You can buy our IBO products on the B2B platform. If you are an end customer, we invite you to check our partner stores and wholesalers. You can also always contact us: +48 22 721 11 92, biuro@dambat.pl.
