Vibration insert for compensating pipeline displacements, installation and application features. Flexible inserts (vibration compensators) What is a vibration insert and where is it used

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In the “Accessories” section we will look at vibration inserts. In our modern life, pumping equipment is used very widely and variedly. The main purpose of anti vibration inserts prevent the transmission of vibration, noise and mechanical stress through pipeline systems; they are also used as compensators for various deformations (temperature, linear and angular). Used in heating and air conditioning systems to compensate for thermal elongation and compression of pipelines, in water supply systems to prevent transmission mechanical vibrations from the system pipelines, as well as to protect pumping equipment and pumping stations from mechanical impact pipelines connected to them. Compensators are also designed to reduce or prevent. Their use significantly increases the service life of the system as a whole. By method of connection to the system vibration inserts or compensators are divided into coupling and flange. The working medium in pipelines where coupling and flange vibration inserts are used can be water, steam, air, gas, oil products, and food products.

Technical parameters and materials

• Working pressure: Ru=16 bar.

Connection diameter coupling vibration inserts: DN 15-50 mm

Materials used:

• The inner layer of the bellows is EPDM;
• The bellows frame is a nylon fabric cord;
• The outer layer of the bellows is EPDM;
• The coupling connection is made of steel.

Parameters of coupling vibration inserts:

• Operating temperature: +110°C;
• Working pressure: Ru=16 bar.
• Working pressure: DN 32-600 – PN=16 bar.
• Working pressure: DN 700-1200 – PN 10 bar.

Connection diameter flanged vibration inserts: DN 32-1200 mm

Materials used:

• Connecting flanges – steel;
• Bellows rubber – EPDM;
• The bellows frame is steel cord – carbon steel; nylon cord is a synthetic fiber.

Device and design

Structure and design of compensators (Fig. 1)

The bellows, vibration insert or compensator has a complex, multi-layer structure. It consists of an outer (Pos. 1), internal (Pos. 3) layers and a frame (Pos. 2). The inner layer is a tube, seamlessly made of rubber, extending beyond the beads of the compensator. Direct contact with the environment is carried out precisely by the inner layer. It also serves as protection for the compensator frame from the impact unfavorable conditions environment. An important condition in the production of vibration inserts, is right choice elastomer, either natural or synthetic. Both of these materials have good properties, they are resistant to liquid or gaseous media, ranging from plain water to sulfuric and hydrochloric acids dissolved in it. The frame is the elastic part of the rubber compensator, which consists of several layers of very high-quality synthetics, for example, nylon. A layer of fabric is impregnated in the frame with mixtures of synthetics or rubber. This was done in order to give them flexibility and mobility. The outer layer of the frame protects the compensator from negative influences external environment And ultraviolet rays. To connect a compensator or vibration insert to equipment and pipelines, rotating flanges (Pos. 4) PN 10 or PN 16 are used, and American flanges are used for coupling connections. Flanges are made of carbon steel.

Installation and operation

During installation vibration inserts or compensators It is necessary to pay attention to the following:

1. The inlet and outlet pipelines must be centered and secured. Expansion joints must not be used as a supporting structure.
2. The maximum compression of the rubber compensator should not exceed 5 mm.
3. Twisting of the compensator is not allowed.
4. The pipelines from the rubber compensator must be secured at a distance of at least three pipeline diameters.
5. The mounting bolts must be installed without direct contact with the rubber. Installation order: the bolt is installed on the compensator side, and the nut on the pipeline side. In case of operation of vibration inserts in systems with increased loads on pipelines, it is used set of rods, protecting compensator – vibration insert from exceeding permissible value stretching or twisting.
6. Simultaneous operation of the expansion joint in tension and torsion is prohibited.
7. In case of welding work the rubber part of the compensator must be protected.
8. It is prohibited to paint compensators or vibration inserts or cover them with a layer of insulation.

Vibrating inserts cannot compensate for misalignments that arise during pipeline installation. The suction and pressure pipelines must be equipped with appropriate supports, mounted as close as possible to the pump. The counter flanges must be laid relative to the pump flanges in such a way as to prevent any transfer of voltage from them to the pump, as this can lead to damage to the pumping equipment. Compensators should be installed directly from the pump at a distanceequal to one to two nominal flange diameters, both on the side of the suction pipeline and on the side of the pressure pipeline. This will avoid the formation turbulent flow in compensators and creates optimal conditions during suction and will create minimal pressure losses in the pressure pipeline. At high water flow rates (more than 5 m/s), vibration inserts should be installed larger size in accordance with the diameter of the pipeline. For flanges with a diameter larger than DN 100, expansion joints with limiting straps must always be used. In (Fig. 2) an example of installation of vibration inserts

To extend the service life of pipelines, it is necessary to use elastic vibration inserts or compensators. They compensate for changes in the length of pipes during their expansion or contraction, as well as possible ruptures of pipelines as a result of temperature changes, pressure changes, and the presence of various vibrations in pipelines. For optimal performance pumping equipment, and in order to minimize noise and vibration, it is necessary to provide ways to dampen vibration from the pump. These methods must be used in mandatory, if pumping equipment is operated with electrical power over 11 kW. Although the likelihood is that engines with lower power can also create unwanted noise and vibration. To reduce these consequences, vibration inserts and vibration supports are used. Vibration inserts have good soundproofing properties; they absorb and reduce noise that is inevitable during the operation of pumping equipment, and are also resistant to hydraulic shocks that occur during pump operation. Vibration mounts are designed for passive and active vibration isolation of pumping equipment, as well as for height adjustment when installing pumps according to level. To compensate for pipeline movements during shifts, shear compensators are used. They have limit rods designed to protect the vibration inserts from damage. You can install limit rods in both compression and tension. These compensators can be used very long time, since due to this design the thrust force is not transmitted to the equipment.

Subject to operating conditions, vibration inserts do not require constant maintenance or repair. Periodically, it is necessary to carry out technical inspections to ensure there are no leaks, and, if necessary, tighten the fastening bolts or coupling connections.

Thank you for your attention.

Flexible inserts (vibration compensators) separate pipeline communications into functional areas. This is done for many reasons; extending the service life of laid pipes and connected equipment is one of the main ones. Vibration compensators consist of metal connecting ends and, in fact, the body of the vibration head: a bellows steel jumper, or a rubber one in the form of a corrugated cylinder or sphere (several spheres) with cord reinforcement and multilayer reinforcement in the middle.

Types of vibration compensators

Flexible inserts are divided according to the material of the compensating bridge: stainless steel, heat-resistant steel, rubber (EPDM); and by type of connection: detachable - coupling (threaded) and flange, one-piece - welding. Flexible inserts differ in type working structure and the method of passive compensation; the industry produces more than ten options.

Scope of application

Main functions of vibration compensators:

• compensation for misalignment and thermal deformations of pipelines;
• reduction of mechanical stress;
• reduction of vibration during equipment operation;
• noise reduction;
• protection against water hammer;
• galvanic isolation (rubber).

Selection of flexible pipe inserts

Vibration compensators should be selected taking into account the diameter and shape of pipeline ends. Important to consider chemical composition material transported through pipes. To work with chemically aggressive mixtures, it is necessary to install special flexible inserts. Great value there is a temperature difference inside and outside the pipeline; this is also taken into account when choosing a vibration compensator.

Characteristics of vibration compensators

Flexible inserts withstand strong internal pressure and maintain tightness during axial displacement. The central element made of reinforced wear-resistant rubber is designed for operation at temperatures up to one hundred and twenty degrees. The steel bellows bridge is made of heat-resistant steel and can withstand elevated temperatures and large differences in internal pressure. The working life of a vibration compensator depends on the proximity of installation to active equipment that creates vibration vibrations, on the method of laying the pipeline, on soil subsidence and displacement of soil horizons.

Features of flexible inserts for pipelines

Vibration compensators “save” the pipeline during transverse and longitudinal displacements, taking on the resulting shifts. If the displacement turns out to be critical, then the flexible insert serves as a fuse; Replacing a failed compensator will cost less than finding the rupture site in the pipeline and repairing it. Vibration compensators dampen noise, vibration and reduce the force of hydraulic shock.

Application of vibration compensators

Flexible inserts are installed at the joints of pipeline sections in the chemical, mining, and processing industries, in heating networks, and on main water pipelines. Pipes and active equipment are connected through them. The use of vibration compensators next to pump modules significantly extends the service life of technical units.

Installation and installation of flexible inserts

For installation of vibration compensators it is used hand tool, levers, sets of keys, solid and adjustable. Welded elements are connected by autogenous or electric arc welding. When installing dimensional inserts, various supporting and lifting mechanisms, jacks, cranes, winches.

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 high 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 of 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.

Depends on the body material maximum temperature working environment that the vibration insert can pass through. 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.
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Compensators used to eliminate vibration on pumping equipment, are placed at a distance from the pump nozzles in the range from 1 to 1.5 nominal diameters of the compensator. In some cases d installation of the rubber compensator is lowered directly to the pump nozzle (If the product manufacturer, in the technical documentation, allows the possibility of such an installation). Operation of the compensator with the valve closed or partially closed is unacceptable.
Before the beginning of work on installation of the product, the vibration compensator needs to be checked, making sure that he surfaces in contact with the joint are thoroughly cleaned and do not have sharp edges that could damage the joint surface. When carrying out installation work Twisting, compression, bending or stretching of the flexible element of the product is not allowed. Preliminary compression should not be more than 5 mm.
During installation, the pipeline must be recorded in special supports ah, located close proximity to the compensator. The distance between the supports and the flexible insert should not exceed three pipeline diameters.
It is prohibited to place gaskets between the compensator and the pipeline flanges, since the design of the product already has a protruding part of the elastic element providing a tight connection. T The use of lubricant is also not allowed, as this may negatively affect the properties of the product materials and lead to the rubber flanging of the compensator being torn out of the connection.
The bolts should be tightened crosswise. The bolt holes must be accurately aligned with the corresponding holes in the counter flanges. The expansion joints are equipped with rotating steel flanges, which simplify installation and reduce the risk of damage to the elastic element due to torsional deformation. If the nuts are over-tightened, the sealing surface may be damaged, leading to deformation, as a result, improper operation of the product. Flange connection bolts must be installed with heads towards the flexible element, the nuts are installed on the side opposite the elastic elements to prevent damage to the compensator. If this is not possible due to various reasons, the threaded part of the bolt should not protrude more than 2-3 mm to prevent damage to the bellows.

Do not perform any pressure or leak tests on the system until correct installation fixed points, guide supports, connections, fixtures and other elements of the system. Sudden pressure drops in the system that exceed the design parameters are not allowed. When performing welding work, the flanged vibration compensator must be dismantled or reliably protected from splashes of molten metal. and is located at a sufficient distance from the work site, since exposure to elevated temperatures can damage the elastic element of the compensator.

An elastic rubber vibration compensator is a safety element that, due to stretching and displacement, absorbs and dampens strong vibration, water hammer, noise, increases the safety of systems, and reduces the load on sensitive components. Products are in demand when completing:

• pipelines transporting gaseous and liquid media;
• pumping units;
• cooling coolers;
• air compressors;
• radiators;
• ventilation and air conditioning devices.

The flexible rubber insert is characterized as unpretentious, reliable device with long service life. An inexpensive product with a simple design is a worthy competitor to more expensive devices of similar functionality. The integration of anti-vibration rubber compensators ensures a tight connection of pipeline elements or technological equipment, allows you to align the misalignment of parts of one system.

Inexpensive elastic devices have practically no restrictions on their use. They are used to complete pipelines and technological installations servicing complex metallurgical production, processing enterprises, chemical industries, and for public utilities. It is allowed to install flexible flange and coupling expansion joints in systems operating at temperatures from –10 to +110 degrees Celsius, transporting:

• hot and cold water, including technical;
• industrial waste;
• essential substances;
• salt solutions;
• mildly aggressive liquids.

The multi-purpose rubber vibration insert is a structure made of elastic elements and spring clamps. The flexible parts consist of an outer shell and an inner layer of EPDM or NBR neoprene, which are stabilized by a nylon tire carcass. Heat-resistant foam rubber from the synthetic rubber category has excellent performance characteristics and is superior in strength to natural and chlorprene rubber.

Vibration inserts flange coupling

The design of the threaded flanged vibration compensator is supplemented with cast iron couplings assembled from several elements. Rigid components are protected from external influence galvanized layer, which, in addition to protecting the metal, strengthens the surface. The flexible relief part of the coupling inserts has an elongated shape. They are produced with a nominal diameter from 15 to 80 mm, designed for working pressure in the circuit up to 1.0 MPa. The angular deflection of the coupling inserts can reach up to 45 degrees, the maximum extension is 6 mm, lateral displacement and compression reaches 22 mm.

Rubber flanged vibration compensators

The non-flammable flexible flanged insert consists of a hollow rubber core secured between parallel nickel-plated steel flanges. Each flange has from 4 to 20 holes through which the anti-vibration rubber compensator connects to the mating flanges of the pipeline or branch pipes of the process equipment. Models of this type are available with nominal diameters from 25 to 1000 mm. They are adapted for operation in circuits in which the pressure of the working medium ranges from 1.0 to 1.6 MPa. Indicators of compensated deviations flexible inserts rubber flanges depending on the sizes are as follows:

• stretch: from 12 to 16 mm;
• compression: from 19 to 26 mm;
• maximum angular deviation – 15 degrees;
• lateral displacement: from 14 to 22 mm.

The flexible elements of oil-gasoline-resistant anti-vibration flange compensators are made of NBR foamed porous rubber, which has high strength and demonstrates high compensating abilities even in aggressive environments. The sponge material is adapted to work in systems that move mineral oils, fuel oil, hydraulic fluids, gasoline, greases at temperatures from –40 to +100 degrees Celsius.

In addition to rubber anti-vibration flange and coupling compensators, we offer to buy control rods in sets. They are necessary to limit the operation of inserts in certain directions. In addition, restraints are used when installing flexible expansion joints, when the fixed supports are located far from each other or it is impossible to plan how the restraints will be installed. The rods can be installed in any spatial position and are offered in sets of 2, 3, 4, 5 and 6 studs.