Rubber compensator. Vibration insert to compensate for pipeline displacements, installation and application features Rupture of the rubber vibration insert

Vibration inserts, also known as rubber expansion joints, find their application in heating, ventilation and cooling systems of enterprises, factories, ships and nuclear power plants. In addition, they are also used in urban water supply and sewerage systems.

The main purpose is to compensate for misalignments that arise due to temperature changes systems. Vibration inserts are necessary to absorb or reduce noise that occurs during pipeline operation, and of course, to compensate for various vibrations and water hammer. Vibration inserts have some limitations during operation: the maximum operating pressure can be 16 atmospheres, and the temperature can be 130°C. Nevertheless, rubber compensators are not inferior to devices similar in purpose.

The main advantages of vibration inserts

Vibration compensators (vibration inserts) belong to auxiliary pipeline fittings. The main purpose is to absorb vibrations created by other equipment in the system: pumps, compressors. Also used for compensation thermal expansion pipes and lateral and angular displacement within the limits of values ​​allowed by the design of a particular rubber compensator (depending on the diameter - up to 22 mm of lateral and 45° angular displacement). They help reduce noise from the operation of equipment that creates vibrations and protect against water hammer. Their work significantly extends the service life of the pipeline system, therefore they are necessarily installed after equipment that creates vibration, transverse and longitudinal displacement and stretching of sections of pipelines. Installed next to equipment that creates large vibrations.

Anti-vibration flexible insert design

A standard vibration compensator consists of the following parts:

• rubber sleeve or body;
• fastening to the pipeline system (2 flanges or threaded fittings);
• reinforcing cord

What materials are vibration compensators made from?

Certainly, different manufacturers may offer different versions this equipment. We will tell you what materials are used in the manufacture of our anti-vibration inserts.

• Flanges/threaded connections: carbon steel.
• Reinforcing cord: carbon steel.
• Housing: EPDM (rubber).
• Rushwork vibration compensators also use an internal filler – nylon cord.

The maximum temperature depends on the housing material working environment, which can be missed by the vibration insert. As a rule, this is from -20 to +105-110°C. Vibration inserts are used for hot and cold water; they can also be used when transporting air. For gases, vibration inserts with a sleeve made of MBR are usually used.

Video: vibration compensator in action

You can buy vibration compensators wholesale and retail from the company “RU100”

We always have in stock pipeline equipment for damping vibration in pipelines, including vibration inserts from a Spanish manufacturer Genebre and Russian Rushwork. We will select the appropriate equipment specifically for your system. We work directly with suppliers, we have our own warehouse, so prices remain low. Reliable supplier pipeline fittings- this is us!

• Our engineers have been working in the industry since 2008. We know what we sell and will be happy to help you choose the right model.
• We will deliver your order throughout Russia! Or you can pick up from our

The flexible rubber vibration insert is a simple and reliable design consisting of an elastic flow part and metal connecting elements. The elastic part is made of heat-resistant rubber reinforced with nylon threads and steel wire. The material has sufficient resistance to ultraviolet radiation and weathering, as well as weak resistance to petroleum products. The flanges are made of galvanized steel. Due to the design features, metal parts do not come into contact with the conductive medium, which allows the products to be installed on pipelines and pumps of any type that transport media acceptable for this product.
Anti-vibration insert is the conventional name for a standard rubber compensator. And although these products are initially designed to compensate for deformations occurring in the pipeline (compensation for lateral, axial and angular displacements), the ability to compensate for transverse displacements and resistance to wear during frequent operations makes them the most accessible means to reduce dynamic loads in the system. These products are much cheaper than complex anti-vibration structures made entirely of metal, which allows the compensators to be used as rubber vibration inserts. Successful application experience served as an impetus for the widespread use of this solution. Such a compensator - vibration insert - made it possible to reduce the transmission of mechanical vibrations, noise levels, oscillations, vibrations in pipeline systems, while compensating for thermal elongations of the system within the limits of permissible deformations. The use of the product allows galvanic isolation of the pipeline and protects equipment from destructive mechanical impact, virtually isolating vibration.
Depending on the types of materials used in the manufacture, a flexible vibration insert can be used when transporting hot and cold water, air, acidic media with a concentration of less than 10%, organic and inorganic alcohols, solutions of salts and alkalis, as well as bulk products. The product is not suitable for transporting hydrocarbons. The permissible nominal pressure can range from 1.0 to 1.6 MPa, and the operating temperature from -40C to +90/110C (depending on the model), which allows their use in housing and communal services, petrochemical, gas, food and other industries.
The price of products such as vibration inserts remains quite low, thanks to timely deliveries and keeping the most popular standard sizes in stock.

Installation instructions for flexible insert ABRA-EJF-10 - rubber anti-vibration compensator

1. Mandatory " "
2. It is necessary to strictly observe the parameters indicated in the tables above, and use control rods reasonably.
3. !!! When installing rubber expansion joints ABRA in pipeline system Additional seals in the form of elastic wafer gaskets are prohibited; a reliable sealed connection is ensured by the rubber lip of the ABRA vibration compensator itself.
4. Flexible inserts should be installed directly behind the fixed support. Movable supports should be provided behind the flexible insert.



5. It is preferable to use collar flanges, although if the installers have the necessary qualifications, it is also possible to install ABRA flexible inserts between flat flanges. Do not forget to remove burrs from the internal weld seam to avoid damage to the rubber.
6. It is not advisable to install a vibration compensator closer than 1.5 pipeline diameters from the restriction devices.
7. The maximum permissible tightening torques for bolts for flexible inserts (vibration compensators) of any manufacturer must be controlled using torque wrenches. In particular, for ABRA inserts up to DN80 inclusive, the maximum moment is 60 N*m, and for larger DNs it is 80 N*m.
8. Flexible vibration compensator inserts can be mounted in any spatial position
9. It is not allowed to use the compensator as a supporting structure, that is, the installation of the compensator must be done after securing the pipelines. The pipes at both ends of the flexible insert must be secured to fixed supports close enough so that the operating range of pipe displacements does not exceed the limits permitted for the insert.
10. It is not recommended that the pre-compression of the compensator during installation exceed 3 - 5 mm. Stretching of the insert during installation is unacceptable.
11. Twisting of the flexible element of the compensator during installation is not allowed.
12. Before starting installation, it is necessary to center the inlet and outlet pipelines, fixing them at a distance of no more than three pipeline diameters from the compensator.
13. Neither the anti-vibration compensator nor the control rods are designed to compensate for errors in pipeline installation, such as flange misalignment.
14. Do not damage the compensator with sharp edges of the pipe or the surface of the connecting flange.
15. Contact of bolts, nuts or studs with rubber is not allowed (for example, when connecting a bolt-nut, the nuts are installed on the opposite side rubber elements- on the pipeline side).
16. Simultaneous operation of the expansion joint in tension and shear is not allowed.
17. The insert must not operate in tension when installed at the pump inlet or when operating under vacuum (negative instrument pressure).
18. It is not allowed to carry out welding work in the immediate vicinity of the compensator insert without protecting or dismantling it.
19. It is not allowed to paint the flexible element of the compensator insert or cover it with a layer of insulation
20. Compensator inserts are stored unloaded in a cool, dry place.
21. Storage and transportation should be carried out without shock loads at temperatures: -40...+65 °C.
22. The estimated service life of rubber expansion joints is 3 years.
23. Warranty obligations.
    The warranty period, subject to the consumer's compliance with the rules of transportation, storage, installation and operation, is 12 months from the date of commissioning, but not more than 18 months from the date of sale. All issues related to warranty obligations are provided by the selling company.

The need to use vibration inserts when connecting units to the pipeline is due to safety measures to prevent factors that destroy various network elements or lead to increased level noise, and for purposes galvanic isolation of the pipeline and protection of equipment from destructive mechanical effects. In addition, the use of such devices is necessary in earthquake-prone areas and when there is a danger of movement of the soil on which the equipment is installed, provided that the displacement does not exceed permissible values ​​(at higher loads it is more advisable to use special devices based on bellows compensators). The requirements of SNiP 14.15 state: “At the inputs in front of the measuring devices, as well as at the points where pipelines are connected to pumps and tanks, it is necessary to provide flexible connections that allow angular and longitudinal movements of the ends of the pipelines.” Flexible pump inserts must be installed when operating pumps with motors greater than 11kW (lower motors may also cause unwanted noise and vibration).
The rotation of the motor and pump rotors, as well as the conductive fluid in the pipeline, cause noise and vibration. The degree of impact on equipment and the surrounding area depends on how correctly the calculations were made and the state of the remaining elements of the system. The most effective way to dampen vibration and reduce noise levels is to use vibration supports on the base plate of the units and connect the pipes to the pipeline through rubber vibration inserts. This allows you to maintain stable operation of the pumps, reduce the load on fragile cast-iron structural elements, and also minimize vibration and noise. In addition, installing compressors and pumps on vibration supports without using rubber inserts on the suction and pressure pipes leads to the equipment hanging on the flanges and, as a result, destruction of the housing of the units and pipeline fasteners. Vibration compensators for pumps help protect equipment and pipelines from vibration, as well as prevent system resonance.
Depending on the material of the flow part, a vibration insert for the pump can be used in systems transporting hot and cold water, air, acidic environments with a concentration of less than 10%, organic and inorganic alcohols, solutions of salts and alkalis, as well as bulk products. The permissible nominal pressure can range from 1.0 to 1.6 MPa, and the operating temperature from -40C to +90/110C (depending on the model).
The price of products remains quite low, thanks to timely deliveries and keeping the most popular sizes in stock.