• TU VRSHE.302667.006TU;
• Certificate and declaration TR CU 32/2013;
• Certificate GOST R
• License for the manufacture of equipment for structures, complexes, installations with nuclear materials intended for the production, processing, transportation of nuclear fuel and nuclear materials
• License for designing equipment for nuclear installations.
• PED (audit by TÜV Rheinland, Germany)
• ISO9001:2008 (audit by TÜV Rheinland, Germany).

Materials for manufacturing

Bellows: stainless steel, corrosion-resistant, heat-resistant, 08Х18Н10Т (AISI321), 08Х18Н10 (AISI304), 03Х18Н11 (AISI304L), 03Х17Н14M3 (AISI316L). Structural cryogenic steel, 12Х18Н10Т (AISI321).

End fittings: high-quality structural carbon steel, grades 20, 35. Stainless steel, corrosion-resistant, heat-resistant, 08Х18Н10Т (AISI321), 08Х18Н10 (AISI304), 03Х18Н11 (AISI304L), 03Х17Н14M3 (AISI316L). Structural cryogenic steel, 12Х18Н10Т (AISI321) or their analogues. Low alloy structural steel for welded structures, 09G2S, 17GS.

Other items: High-quality structural carbon steel, grades 20, 35. Stainless steel, corrosion-resistant, heat-resistant, 08Х18Н10Т (AISI321), 08Х18Н10 (AISI304), 03Х18Н11 (AISI304L), 03Х17Н14M3 (AISI316L). Structural cryogenic steel, 12Х18Н10Т (321 or their analogues. Low-alloy structural steel for welded structures, 09G2S, 17GS.

Bellows expansion joints are small in size, can be installed anywhere in the pipeline using any method of laying it, and do not require the construction of special chambers and maintenance throughout the entire life of the pipeline. service life. Their service life, as a rule, corresponds to the service life of pipelines.

The use of bellows expansion joints provides reliable and effective protection of pipelines from static and dynamic loads arising from deformation, vibration and water hammer. Thanks to the use of high-quality stainless steels in the manufacture of bellows, KSO are able to work in the most severe conditions with temperatures of working media from “absolute zero” to 1000°C and withstand operating pressures from vacuum to 100 atm, depending on the design and operating conditions.

Depending on the purpose and conditions of use, various designs of bellows expansion joints are used, which are various combinations of bellows, connecting and limiting fittings, guide pipes and protective covers.

The main part of the axial bellows compensator is the bellows - an elastic corrugated metal shell that has the ability to stretch, bend or shift under the influence of temperature changes, pressure and other types of changes.

They differ from each other in such parameters as dimensions, pressure and types of displacements in the pipe (axial, shear and angular). Based on this criterion, bellows expansion joints are divided into axial, shear, angular (rotary) and universal.

The bellows of modern jacketed expansion joints consist of several thin layers of stainless steel, which are formed using hydraulic or conventional pressing. Multi-layer expansion joints neutralize the impact high pressure and various types of vibrations, without causing reaction forces, which in turn are provoked by deformation.

Corrugated metal axial expansion joints in a casing are made of longitudinal welded pipes. These compensators are designed and manufactured in full compliance with EJMA standards and according to temperature and pressure indicators.

Compensator in casing for heating and water supply systems

Application:

Pipe casing expansion joints, which are one of the types of axial bellows expansion joints, are an expansion that is used to absorb noise and resulting vibration. The expansion, being divided into parts inside the pipeline systems, is isolated using fixed points. Thus, the movement that occurs in the vibration area is absorbed by the pipe expansion joints that are used inside the area.

Today at multi-storey buildings common, expansion and contraction that occur due to temperature changes in the columns of heating equipment lines and hot water, can lead to pullout of the tooth, rupture of parts of the connection, noise, and irregularities in the pipes.

Advantages of axial expansion joints in a casing from Ayvaz:

They have a multi-layer bellows with an internal guide sleeve.

Prevent expansion in column pipes, noise, disruption and distortion.

Provides energy savings to prevent pressure loss.

Reduces costs for labor, although preparation and installation are very quick and very simple.

Column lines can be easily used in rooms, corridors, and offices. At the same time having an aesthetic appearance.

In the heating equipment columns the temperature is 90*C/70*C, on each floor the expansion is approximately 3mm. In the column lines of a 7-story building (21m), in combination with the expansion, ventilation and main line, expansion, ventilation and the main pipe in their concentration in the column lines of a 7-story building (21m), bends can form.

Axial expansion joints for pipes from Ayvaz, have a multi-layer bellows, which are necessary for use in column lines of buildings higher than 7 floors, 1 expansion joint is used at most for 30 m (1 expansion joint for 10 floors.)

Zo meters is the greatest distance between two fixed points.

In a location that is close to the ceiling, floor, between two fixed points, KSOs are mounted in a St. Petersburg casing, for pipes from Ayvaz.

Material structure:

Stainless steel according to DIN17440; connecting elements are made of carbon steel, external protection is made of decorative-looking aluminum.

Connections:

Rotating Flange - Welding Connection

Nominal diameter - DN15 (1/2") - DN100 (4")

Pressure indicators:

Max. up to 16 bar (operating pressure depends on nominal diameter and operating temperature)

Temperature range - According to the structure of the material: from -20*C to 90*C.

Axial expansion joints, are used for absorption thermal expansion along the axis of the pipe. Pipe systems the inside was divided into parts using fixed partitions to prevent heterogeneous expansion and provide insulation. Thus, the movement that occurs in the expansion area is absorbed by the metal bellows expansion joint used in this area.

Axial compensators in casing, manufactured according to 30 and 60 mm standards, can be produced upon special request with different expansion rates. Liner materials are used to interrupt the connection between the bellows and the liquid and regulate the flow. Using the flow temperature and bellows materials, which are associated with pressure, the number of floors and wall thickness are developed.

connections:

rotating flange

fixed flange
with welding connection

Structure:
Design and production: made according to EJMA standards. Pressure and temperature indicators in accordance with DIN 2401 standards.

Material structure:
corrugations and inserts are made of stainless steel in accordance with DIN 17440 standards, connecting elements are made of stainless or carbon steel. Other materials can be produced upon request.

Nominal diameter - DN 25(1") - DN 2600 (104")

Pressure indicators

Axial expansion joints in casing, are manufactured according to the standard pressure category PN16, compensators in which it is necessary to achieve higher pressures are manufactured according to special design. Dependent on operating pressure, nominal diameter and operating temperature.

Temperature range:

In accordance with the structure of the material - from 196 *C to + up to 600 *C

Application:

All types of thermal equilibrium and mechanical expansion of the pipeline.

"Transmash" - bellows expansion joints DN15-1400 mm - axial, angular and shear.

A bellows compensator is a device, a flexible insert, used in pipeline systems that serves to compensate for changes in the length of pipeline sections that occur due to thermal expansion of the pipe material or as a result of installation work.

Bellows compensator diagram

Characteristics of bellows expansion joints

Below are the characteristics of bellows expansion joints

Technical characteristics of bellows expansion joints (KSO) 50-400 mm

Axial bellows compensators SKO

Axial compensators are designed to compensate for axial movements of pipelines. Reduce the level of vibration transmitted from the vibration source to the pipeline.

Designation

Du, mm

Dimensions, mm

Axial movement, mm

Axial stiffness, N/mm

D

I

L

SKO 80-1.6

80

89

93

300

36

158

RMS 100-1.6

100

108

115

320

50

201

SKO 125-1.6

125

133

128

330

54

217

SKO 150-1.6

150

159

169

370

75

264

SKO 175-1.6

175

194

138

340

75

222

SKO 200-1.6

200

219

173

380

90

278

SKO 250-1.6

250

273

168

370

90

260

SKO 300-1.6

300

325

232

435

110

352

SKO 350-1.6

350

377

230

430

120

381

SKO 400-1.6

400

426

297

500

130

440

SKO 450-1.6

450

465

288

490

150

415

SKO 500-1.6

500

530

352

600

170

539

SKO 600-1.6

600

630

365

600

180

550

SKO 700-1.6

700

700

370

610

185

602

SKO 800-1.6

800

820

400

640

200

597

RMS 1000-1.6

1000

1020

420

660

220

723

SKO 1200-1.6

1200

1220

476

680

250

705

SKO 1600-1.6

1600

1620

500

700

250

1314

Angle bellows compensators SKU

Angular compensators are designed to compensate for angular movements of pipelines in one plane. They do not transmit thrust force to the pipeline.

Designation

Du

Connecting dimensions, mm

Overall dimensions, mm

Angular rigidity, Nm/deg

D

n

d

L

B

SKU 80-1.6

80

160

4

18

160

285

5

SKU 100-1.6

100

180

8

18

170

305

11

SKU 125-1.6

125

210

8

18

185

335

14

SKU 150-1.6

150

240

8

22

180

370

17

SKU 175-1.6

175

270

8

22

190

398

27

SKU 200-1.6

200

295

12

22

200

425

40

SKU 250-1.6

250

355

12

26

240

510

72

SKU 300-1.6

300

410

12

26

285

585

112

SKU 350-1.6

350

470

16

26

300

645

225

SKU 400-1.6

400

525

16

30

360

690

341

SKU 450-1.6

450

585

20

30

425

745

323

SKU 500-1.6

500

630

20

33

460

830

501

SKU 600-1.6

600

770

20

39

480

925

843

SKU 800-1.6

800

950

24

39

620

1160

2199

SKU 1000-1.6

1000

1170

28

45

775

1370

3047

SKU 1200-1.6

1200

1390

32

52

925

1600

4264

Shear compensators SKS

Shear expansion joints are designed to compensate for shear movements of pipelines. They do not transmit thrust force to the pipeline.

Designation

Conditional passage, DN, mm

Work pressure P, MPa

Work temp., t, °С

Moving

L, mm

D, mm

Axial, mm

Shift, mm

Angular, degree

SKS25-0.67-210

125

0,67

210

-

±15

-

590

345

SKS200-0.6-110

200

0,6

110

-

±2.5

-

250

425

SKS200-0.6-110

200

1,6

110

-

±4.5

-

328

497

SKS250-0.63-110

250

0,63

110

-

±11

-

380

546

SKS300-0.6-110

300

0,6

110

-

±8

-

400

627

SKU400-2.5-200

400

2,5

200

-

-

±1

800

715

SKU500-2.5-200

500

2,5

200

-

-

±2

950

849

Bellows expansion joints consist of:

• one or two bellows - thin-walled corrugated shells made of anti-corrosion stainless steel;
• low-carbon steel pipes used to connect expansion joints to the pipeline;
• protective casing made of low-carbon steel sheet, fixed to the posts with screws.

A straight section of pipeline between fixed supports when changing temperature regime The heating network receives a certain increase in its length due to temperature expansion of the pipeline materials. The resulting stress, stretching or compression can lead to bending of the pipes or their destruction. The corrugations of the bellows of the compensator installed in this section, elastically deforming, perceive, within the compensating ability, changes in the length of the pipeline section caused by temperature expansion.

Bellows expansion joints

Stainless steel bellows expansion joints are designed to compensate for various movements according to specified parameters. In order to achieve maximum service life, pressure resistance, reliability and durability, care must be taken in handling, storing and installing expansion joints. Similar caution is exercised when following the rules below.

Storage and transportation of bellows expansion joints

If handled incorrectly or carelessly, the bellows expansion joint may be damaged or deformed, which in turn will negatively affect its technical characteristics.

The bellows compensator cannot be subject to mechanical damage, as well as damage caused by exposure to humidity, water, soil, sand, chemicals, etc.

Transportation fittings, tightening joints, cardan suspensions (hinges) cannot be used to move the bellows compensator as lifting loops. Also, bellows expansion joints cannot be moved in such a way that could cause mechanical damage bellows (for example, lift the expansion joint by the bellows).

The bellows compensator must be stored on a straight plane indoors; if this is not possible, then under the protection of a waterproof coating.

Bellows expansion joints cannot be placed on top of each other or stand very close to each other.

If the ends welded to the bellows expansion joint (welded connection) due to their weight subject the expansion joint to deformation, they must be supported from below using wooden beams.

The service life of the bellows expansion joint provides that the bellows expansion joint will under no circumstances be subject to mechanical or temperature influences other than those provided for during the design. Bellows expansion joints can only be installed in pre-designated locations within pipe networks. If the installation rules are not followed, the service life of the bellows compensator, as well as its ability to compensate for pressure, can be significantly reduced, which in turn will lead to damage in the networks.

Preparation for installation of bellows expansion joints

The pipe to which the bellows compensator will be connected must be checked before installation for any inaccuracies. Identifying inaccuracies is important, as this will eliminate the overload of the bellows compensator caused by the desire to balance these inaccuracies. The following must be checked:

Was the bellows compensator damaged during transportation? Damage may include dents or bulges, damage to transport fittings, signs of water on the compensator (signs of corrosion), etc.

Does the distance between the ends of the pipes to which the bellows compensator will be mounted correspond to what was provided?

Pipes to which it is connected bellows expansion joint, must be firmly secured using fastening points and sliding supports.

Support points must be designed in such a way that they are able to compensate for reaction forces and other influences.

The bellows expansion joint can only be mounted between two fixed supports (only for axial and shear expansion joints).

The increase can only occur in accordance with the parameters of the bellows compensator.

The bellows expansion joint cannot be subject to twisting or stretching.

Fixed and sliding supports must be placed on the connecting pipe in such a way that:

The bellows expansion joint was not subject to stress caused by the weight of the pipe.

The pipe did not sag between the fixed and sliding supports.

Sliding support location

The distance between the bellows expansion joint and the first support cannot exceed 4 x pipe diameter.

The distance between the first and second support cannot exceed 14 x pipe diameter.

The distance between the remaining sliding supports cannot exceed 21 x pipe diameter.

The distance must be reduced in cases where pipe stabilization is required.

All kinds of protective clips and safety fittings must be removed after installation of the entire pipe system. Elements to limit the movement of the compensator, such as tightening, cardan suspensions (hinges), are not eliminated, since they are an integral part of the compensator.

In case That is, if the bellows compensator is equipped with an arrow, during installation it is important to make sure that the arrow points in the same direction as the direction of the conductive medium flowing through the pipes.

The expansion joint bellows must be protected from welding plaster (during welding).

The expansion bellows must not come into contact with working tools or lifting devices when installing it.

The length of the bellows compensator must correspond to the length intended for installation. Thus, the bellows expansion joint must be installed in the length that it has at the time of delivery.

The expansion bellows cannot be used for moving, hanging, storing, etc. compensator. These actions should only be carried out using welding or flange connections, or a protective cage.

Any welding or screwing of the bellows expansion joint must be carried out in such a way that the bellows is not damaged.

A bellows compensator, which is subsequently subject to insulation and does not have external protective fittings, must be equipped with external protection in the area of ​​the bellows. Such protection will prevent insulating material from getting into the bellows coils over time and thereby interfering with its normal functioning.

Precautionary measures

Avoid falling or being hit by the bellows.

Do not use cleaning products containing chlorides.

Do not use steel wool or brushes to clean the bellows.

Do not forcefully twist one end of the expansion joint so that it aligns with the bolt holes in the corresponding pipe. Conventional bellows are not designed to absorb twist.

Fastening points and fastening systems must be accurately calculated.

After installation

Before the completed pipe system is put into operation, it is necessary to visually inspect everything technical details. Many years of experience show that if this advice is followed, installation is usually successful.

Check whether the bellows expansion joint was damaged during installation or handling.

Check the correct installation of the entire system, and especially the support points, in accordance with project documentation and installation instructions.

Check the correct installation of the bellows expansion joint in the entire system for location and correct connection.

Check the correct installation of the bellows compensator in the direction of the conductive medium in the system.

Check whether the bellows and other moving parts of the compensator are free of foreign materials.

Check that all packaging materials and protective fittings have been removed from the bellows expansion joint.

If a system is designed for a light conductive medium (gas) and must be tested with a heavier conductive medium (water), check that all necessary measures precautions for safe operation.

The issue of ensuring safety when transporting various media is very important. That is why we will talk about the use of bellows expansion joints as one of the ways to ensure the reliability and long-term operation of communication systems.

When transporting liquids or gases, pipeline sections are constantly exposed to external negative factors, which include expansion and contraction due to temperature changes, mechanical waves, changes in the parameters of the pumped substance and stress due to subsidence of the foundation. In order to reduce the likelihood of deformation and increase the duration of the service life, bellows-type compensators are used, which reduce Various types loads.

The material for the manufacture of bellows expansion joints is stainless steel, which can remain operational in a high range of temperatures and pressures. This explains the high reliability of compensating devices of this type in protecting communications from negative consequences water hammer, stretching, fractures and other deformations.

Oil seal compensators are sliding devices axial action, which compensate for disturbances using a telescopic pipe or compression of spring inserts.

Compensating devices are used:

Devices and types

The design of the compensating device consists of a bellows and fittings. A bellows is a thin-walled pipe made of stainless steel or composites in the form of a corrugation. The number and thickness of corrugations, which affect the strength characteristics, are determined based on the pumped medium and operating parameters.

Pipe movement can be angular, linear or shear. The casing is adjacent to the connecting elements in the form of special tubes to protect the structure.

The fittings differ in design; the choice of a specific one depends on the type of object and the functions performed. Based on the type of connecting fittings, bellows-type compensating devices are distinguished into those connected by a flange and by welding. Hinges and other movable structures are components of reinforcement.

In most cases, the fittings are made of brass, bronze or stainless steel. Bellows-type compensators make it possible to create connections that will not allow either liquid or gas to pass through, even under constant loads. When there is a difference in temperature and pressure, the device undergoes some contraction or expansion. Refusal to use compensators significantly reduces the service life of communications. The main parameters of compensators are their dimensions, shape and maximum pressure.

Based on the type of deformation, compensating devices are divided into:

• with internal screen or protective casing
• by grade of stainless steel used to make the bellows;
• according to the grade of stainless steel used for the manufacture of the cardan, hinge, tie rod;
• with flanged, threaded and welded connection to the pipe;

Based on their design, these devices are divided into:

• by nominal diameter;
• by working pressure;
• according to temperature conditions;
• according to the transported medium: water, steam, for petroleum products, for aggressive substances.

Where are compensators used? Their advantages.

Bellows-type compensating devices are widely used in various fields. These include:

• heating systems for houses and industrial areas;
• oil and gas industry enterprises;
• military-industrial complex objects
• chemical, energy and food production;
• automotive industry facilities;
• factories for the production of cryogenic equipment.

The advantages of these devices include:

• high reliability;
• durability;
• ease of maintenance and installation;
• small sizes;
• various configurations
• Possibility of manufacturing according to personal order.

Designation of bellows type compensators.

Let's consider this using the example of the following bellows compensator, designated: 1КСОФр.K3 150-15-100-10-10.

The first number 1 indicates the number of sections of the device. KSO designates the type of compensator, in in this case: bellows type axial compensator. Fp speaks of a flange plus pipe connection. The same letter, but without the lowercase sign, indicates a flange connection only. The letter K means the presence of a protective casing in the design, and the letter Z means an internal screen. The number 150 helps to establish nominal diameter devices, and 15 understand the conditional operating pressure. Next comes a series of three numbers indicating the compensating ability. The first number shows axial, the second shear, the third angular. Thus, the device has the following compensating characteristics: 110, 12, 12 millimeters, respectively.

The price of bellows-type expansion joints ranges from 150 to 600 rubles, which makes them attractive to the buyer. other types are much more expensive.

Installation and Assembly Requirements

These requirements include the following:

• bellows-type expansion joints should be assembled simultaneously with the assembly of the entire pipeline;
• installation dimensions should be observed according to the parameters in the drawings;
• An arrow is placed on the device body, the direction of which should indicate the direction of movement of the pumped medium.
• it is necessary to exclude any loads during assembly.

The connection of the compensating device can be carried out using, or using welding.

So, this article covered everything you need to know about bellows expansion joints. The main conclusion from all of the above is the following: compensating devices must be used without fail during the construction of pipelines in order to ensure reliability and a longer period of operation.