Vibrating inserts for pumps. Vibration damping inserts

Vibration compensators (vibration inserts) are auxiliary pipeline fittings. The main purpose is to absorb vibrations created by other equipment in the system: pumps, compressors. They are also used to compensate for thermal expansion of pipes and lateral, angular displacement within the limits allowed by the design of a particular rubber compensator (depending on the diameter - up to 22 mm lateral and 45 ° angular displacement). They help to reduce noise from the operation of equipment that creates vibrations, to protect against water hammer. By their work they significantly extend the service life of the pipeline system, therefore, in without fail are installed after equipment that creates vibrations, transverse and longitudinal displacement and stretching of sections of highways. Installed next to equipment that creates large vibrations.

The design of the anti-vibration flexible insert

The standard vibration compensator consists of the following parts:

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

What materials are vibration compensators made of?

Of course, 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, which the vibration insert can skip. As a rule, it is from -20 to +105-110°C. Vibration inserts are used for hot and cold water, they can also be used for air transportation. 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 in the company "RU100"

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> Vibration damping inserts

The main task of the vibration damping insert is to prevent the transmission of strong vibrations from the compressor to the discharge and suction pipelines in order to avoid damage to the brazed seams and the pipes themselves. Vibration inserts are usually installed on the discharge and suction pipelines in the immediate vicinity of the compressor. The PCS company supplies and constantly maintains in stock all the lineup vibration inserts manufactured by Henry (Scotland). Two main series are produced: — V series — with copper fittings and maximum working pressure from 44 to 22 bar (depending on the diameter). – VS series – VS vibration inserts are made entirely of of stainless steel and have a higher maximum working pressure - from 60 to 20 bar (depending on the diameter). Both V and VS series are designed for operation with HFC, HCFC refrigerants and VS also with CO2.

Construction materials

The vibration inserts of the V and VS series are structurally a corrugated hose with a stainless steel braid. The ends of the corrugated part of the vibration insert are connected to copper (V) or stainless (VS) branch pipes.

Specifications

The operating temperature range for series V and VS is from -40 to + 120°C.

Vibration-damping inserts of the V-series

Vibration-damping inserts of the VS series

The compensator rubber flange or coupling is applied both on horizontal and vertical pipelines. The rubber compensator may only be used for the intended technical specifications. Before starting the installation of rubber expansion joints, it is necessary to center the inlet and outlet pipelines. Expansion joints may only be installed after the pipeline has been secured.

The nuts are installed on the side opposite the rubber elements. It is not allowed: twisting of compensators; simultaneous operation in tension and shear mode; the use of compensators with a damaged rubber element.

It is not recommended: paint the compensator or cover it with thermal insulation.

Rubber expansion joints must be installed and commissioned by trained and experienced personnel.

Installation schemes for rubber compensators

Before starting work, completely remove the packaging and inspect the compensators for any possible damage due to transportation or storage, in particular - deformation as a result of external surface damage. The internal cavity of the bellows must be free of any foreign bodies or materials. Only compensators in excellent condition are allowed to be installed.

The compensators are equipped with rotating steel flanges that simplify installation and prevent torsional deformation. Holes for bolts (studs) must be exactly aligned with the corresponding holes in the counter flanges.

Only one compensator can be installed between two points (supports). Any expansion in this area between two fixed points must be less than the maximum compensating capacity of the compensator.

Mount the compensator as close to the fixed point as possible. If the compensator is installed on one side near a fixed support, then a sliding support is installed on the other side. Otherwise, the sliding support is installed on both sides.
The distance between the reference point and the compensator is approximately equal to twice the nominal diameter (2xDN, mm).

The configuration and dimensions of the fixed points and sliding bearings are determined by the installer based on the maximum forces and moments occurring in the system. The sliding support on the guide section must be long enough to prevent jamming.

Do not perform any pressure or leakage test on the system until correct installation fixed points, guide supports, connections, fixtures and other elements of the system.

The total length of the installation is equal to the construction length.

The use of a compensator to compensate for misalignment of pipelines leads to a decrease in the compensating capacity, additional load and, as a result, a reduction in the service life of the compensator.

Expansion joints must not be subjected to torsion deformation! Special care must be taken with any type of installation to ensure that no "torsion effect" of the compensator due to any piping stress occurs.

Do not lift expansion joints with ropes or rods through the threaded holes in the flanges. If the expansion joints are rising through the clearance hole, use a shim to distribute the weight. Make sure that the cables or forks of the loader do not come into contact with the rubber part of the compensator. Do not place the compensator vertically on the edges of the flanges.

It is unacceptable to paint or coat the rubber part of the compensator with grease.

During installation, it is necessary to ensure that the compensator bellows is not damaged, and to exclude foreign bodies from entering the compensator. The compensator must be cleaned inside and out and in this condition the compensator must be prepared for installation for its proper functioning.

Transport bolts, studs should be removed, if possible, after the installation of the compensator is completed.

Where possible, expansion joints should be installed in such a way that they can be visually checked regularly for damage. Damaged expansion joints must be replaced immediately.

Sudden pressure drops in the system that exceed the calculated parameters should be avoided.

The need to use vibration inserts when connecting the units to the pipeline is due to safety measures to prevent factors that destroy various elements of the network or lead to increased noise levels, and in order to galvanic isolation of the pipeline and protection of equipment from destructive mechanical impact. In addition, the use of such devices is necessary in seismically hazardous areas and at the risk of movements of the soil on which the equipment is installed, provided that the displacement does not exceed permissible values ​​(with more high loads it is more expedient to use special devices based on bellows expansion joints). The requirements of SNiP 14.15 state: "At the inputs in front of the measuring devices, as well as at the points of connection of pipelines to pumps and tanks, it is necessary to provide flexible connections allowing angular and longitudinal movement of the ends of the pipelines. "Flexible connectors for pumps should be installed when operating pumps with electric motors with a power greater than 11 kW (lower power motors can also cause unwanted noise and vibration).
The rotation of the motor and pump rotors as well as the conductive medium in the piping cause noise and vibration. The degree of impact on the equipment and the surrounding space depends on how correctly the calculations were made and in what condition the remaining elements of the system are. The most effective way to dampen vibration and reduce noise levels is to use vibration mounts on foundation slab units and connection of nozzles to the pipeline through rubber vibration inserts. This allows you to keep the pumps stable, reduce the load on fragile cast iron structural elements, and minimize vibration and noise. In addition, the installation of compressors and pumps on vibration mounts without the use of rubber inserts on the suction and pressure pipes leads to hanging of the equipment on the flanges and, as a result, the destruction of the casing of the units and pipeline fixtures. Vibration compensators for pumps allow you to protect equipment and pipelines from vibration, as well as prevent system resonance.
Depending on the material of the flow path, the vibration insert for the pump can be used in systems transporting hot and cold water, air, acid media 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 in this case can be from 1.0 to 1.6 MPa, and working temperature from -40С to +90/110С (depending on the model).
The price of products remains quite low, thanks to timely deliveries and keeping the most popular sizes in stock.

As a safety element against strong vibration, hydraulic shocks in gas and water supply systems, pumps, compressors and other types of equipment, flexible rubber inserts (rubber compensators) are used.

Thanks to its high strength properties and versatility flexible connectors for pipelines and pumps are widely used in various industries and the national economy.

Design and main functions

A ready-to-use rubber compensator consists of interconnected elastic elements and spring retainers (steel wires). The elastic element includes:

1. outer layer made of foamed porous rubber (EPDM neoprene);
2. plastic frame made of nylon fabric;
3. inner layer of construction in EPDM or NBR neoprene.

The material for manufacturing the flexible element of the inserts is heat-resistant from a complex of synthetic rubbers, physical properties which are superior to chloroprene and natural rubber.

Flexible rubber inserts have the following characteristics:

• impact resistance - withstand different types loads, without stratifying at the same time;
• non-flammable - safe to use at high temperatures;
• retain the original parameters when the temperature rises (maximum - up to 100 degrees);
• resistance to pressure, for a long time;
• high elasticity - adds strength under mechanical stress (compression, tension, angular and axial displacement, vibration);
• low weight.

The properties of rubber expansion joints allow them to be used to solve a wide range of various tasks, namely:

• Ensuring the tightness of connections (reduce heat loss).
• Reduction or elimination of vibration levels.
• Noise absorption during the operation of various mechanisms (pumps, pipelines, automated shut-off equipment, etc.).
• They take on the function of a compensator for high temperature movements, as a result of which it can be partially deformed, preventing serious changes in the functioning of the mechanism (pipeline).
• Reduction of mechanical vibrations in the operation of the system.

Flexible connectors are used in systems conducting both air (technical) and liquid. The type of insert is selected based on the expected loads and the working mechanism of the system.

Flanged and threaded

According to their design, inserts are of two types: flanged and coupling (threaded).

Flanged flexible connectors (anti vibration compensator) are a hollow core (elastic element) fixed between parallel flanges with a protective coating.

Main criteria and selection parameters flange inserts the following:

1. conditional diameter (25-1000 mm);
2. maximum working pressure (1.0-1.6 MPa);
3. number of holes on each flange (from 4 to 20);
4. compensated deviations:

• compression (19-26 mm);
• lateral displacement (14-22 mm);
• angular deviation (maximum at an angle of 15 degrees).
• stretching (12-16 mm);

Working medium for flange inserts: hot, cold, technical water, solutions of salts, ethers and others. The temperature range of the pumped medium ranges from -10 to +110 degrees. To be attached to the pipeline with a flange connection.

The elastic element of the threaded inserts is complemented by cast-iron couplings, which consist of several parts. metal part The vibration insert is covered with a protective galvanized layer, which significantly strengthens the surface and protects against the effects of the external environment.

Due to the fact that the flexible part of the coupling inserts has an oblong relief shape, the parameters and main functional characteristics of these models differ from the flange inserts:

1. conditional diameter (15-80 mm);
2. maximum working pressure - 1.0 MPa;
3. compensated deviations:

• stretching (maximum - 6 mm);
• compression and lateral displacement (up to 22 mm);
• angular deviation can reach 45 degrees.

The requirements for the temperature and composition of the working medium of threaded inserts are the same as for flange inserts.

Use in pumping installations and pipelines

Anti-vibration compensators are in demand in public utilities, processing industry, chemical and metallurgical industries. Especially effective and reliable is their installation in pumping equipment and pipeline lines.

Despite the simplicity of the device, flexible connectors for pumps are not inferior to expensive and advanced devices with similar functions. Modern analogs, along with advantages, have a number of limitations, which narrows the range of their application.

Flexible connectors for pumps have long established themselves as reliable, durable and "unpretentious" devices. They are used to reduce the vibration load and protect the sensitive elements of the system from the movement of the working environment. Able to reduce the force of water hammer and increase the period of operation of mechanisms.

Flexible pump connectors can be effectively used in various types equipment: cooling coolers, ventilation and air conditioning systems, radiators and air compressors. For safety reasons, it is mandatory to use them in pumping units residential and public buildings (schools, kindergartens, hospitals).

In pipeline networks, vibration inserts (vibrocompressors) will play the role of a compensator for the thermal increase in pipelines (within the allowable deformation limits). In addition, they contribute to the reduction of vibrations and "working" noise, as well as increase the safety of the system.

Compensators of various diameters are applicable in pipeline networks of heat carriers, water (waste, technical), in residential and communal premises, manufacturing enterprises and other organizations.

"Pipeline" compensators allow:

• connect pipes with a tight, elastic fastening;
• protect the most “fragile” elements of the pipeline from dangerous loads during the operation of the system;
• compensate for pipeline deformations due to stretching, displacement of elastic elements;
• vary the direction of the pipeline system (elongation, longitudinal or transverse displacement);
• while doing repair work, the compensator can even out the discrepancies that have arisen between the pipes.

Service life and endurance various kinds loads, make flexible rubber inserts the most popular vibration-reducing and compensating devices.