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Fabric Air Duct Fibre Fabricnon Metallic Expansion Bellows Joint Round /Compensator

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Fabric Air Duct Fibre Fabricnon Metallic Expansion Bellows Joint Round /Compensator

Country/Region china
City & Province beijing beijing
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Product Details

1. Expansion joints(compensators)

  • Introduction

Expansion joints are commonly referred to as compensators. They consist of one or more bellows (an elastic component) as the main working body, as well as connectors at both ends, supports, flanges, conduits, and other accessories. Expansion joints are a flexible structures installed on vessel shells or pipelines to compensate for additional stresses caused by temperature differences and mechanical vibrations. By utilizing the effective expansion and contraction of the bellows, they compensate dimensional changes in pipelines, conduits, vessels and so on, which are caused by thermal expansion and contraction, or compensate for axial, lateral, and angular displacements of pipelines, conduits, vessels, etc. They can also be used for noise and vibration reduction and heating supply systems. In order to prevent deformation or damage to heating pipelines caused by thermal expansion or temperature stress when the heating pipelines are heated, compensators need to be installed on the pipelines to compensate for thermal expansion of the pipelines, thereby reducing the stress on the pipeline walls and the forces exerting on valves or support structures.

As expansion joints are elastic compensating components capable of free expansion and contraction, they have the advantages of reliable operation, good performance, and compact structure,and others.Hence they are widely used in departments such as chemical engineering, metallurgy,nuclear energy,and the like. There are various forms of expansion joints used on vessels, with the U-shaped expansion joint being the most widely used in terms of the shape of bellows, followed by Ω-shaped and C-shaped joints. As for expansion joints used on pipelines, they are classified according to structural compensation into universal expansion joint, pressure balanced expansion joint, hinged expansion joint, and gimbal expansion joint.

  • Classification

Main ItemClassificationDescription

Metal Expansion Joint

Elbow Expansion Joint

Bend the pipe into a U-shaped or other shape, also known as tension bends,are a type of expansion joint that utilizes the elastic deformation ability of the form to compensate. Its advantages are good strength, long service life, and on-site production.The disadvantages are space-consuming, high steel consumption, and high friction resistance. This type of expansion joint is widely used in various steam piping and long pipes.

Bellows Expansion Joint

 

A bellows expansion joint is a metal joint that expands/contracts axially, allowing slight bending. Protective rods/rings and guide supports prevent over-compensation. Angular and lateral joints compensate for rotational/lateral deformations. Advantages: space-saving, material-efficient, easy standardization, mass production. Disadvantage: shorter lifespan. Commonly used in short, low-temp, low-pressure pipes. With technological advancements, they now handle up to 6.0 MPa in pipe systems.

Slip-Type Expansion Joint

The slip-type expansion joint has inner and outer sleeves that can move axially relative to each other. The gap is sealed with stuffing box. Ensure pipes' ends move axially aligned. It comprises sleeves, shells, sealing materials, etc. It compensates for axial expansion and rotation of pipelines. Ideal for hot water, steam, and grease. By sliding the inner sleeve, it adjusts for thermal expansion. Connected to the pipeline, the inner sleeve freely slides inside the shell. Uses a new synthetic seal between shell and inner sleeve, resistant to heat, corrosion, and aging. Ensures axial sliding while preventing media leakage. Temperature range: -40 to 150°C, up to 350°C under special conditions.

Non-metallic Expansion Joint

Rubber Expansion Joint

Composed of rubber and rubber-fiber composite materials, steel flanges, sleeves, and insulation materials, it is mainly used for flexible connections between various fans and ducts. Its functions include shock absorption, noise reduction, sealing, medium resistance, easy displacement and installation. It is an ideal accessory for shock absorption, noise reduction, smoke and dust removal in the field of environmental protection.

Fabric Expansion Joint

Fabric expansion joints are made of fiber fabric, rubber, and other heat-resistant materials. They compensate for fan and duct vibration and deformation, addressing axial, lateral, and angular issues. They offer simplified support design, corrosion resistance, and noise and vibration reduction. Ideal for hot blast pipes and power plant smoke and dust pipelines, they absorb sound and isolate vibrations, reducing noise and vibration from boilers and fans. They are simple, lightweight, and easy to maintain.

 

  • Special materials

Super Austenitic Stainless Steel:254SMO,904L,AL6XN

Duplex Stainless Steel :2205 Dual phase steel (S31803)

Nickel Based Alloy Steel:INCOLOY800/800H/800HT/840/825,INCONEL600/601/690/625/X-750

Hastelloy Alloy C-276/C-22/X,MONEL400/K500

Pure Nickel:N4,N6(Ni200,Ni201)

Titanium Plate For Stamping:GR1,GR2,TA1,TA2

Austenitic Stainless Steel:SUS304,SUS304L,SUS316,SUS316L,SUS310S,SUS321,SUS316Ti

 

2. Non-metallic Expansion joints

  • Non-metallic compensators/expansion joint types

Non-metallic compensators can be divided into the following types: straight cylindrical non-metallic expansion joints, compound non-metallic expansion joints, angular non-metallic expansion joints, and square non-metallic expansion joints.

Rectangular non-metallic compensators are mainly used in flue ducts of power plants to absorb thermal displacement and/or shock absorption. The connection types for rectangular non-metallic compensators include flange connection and nozzle connection.

 

 

  • Common structural types of non-metallic compensators (non-metallic expansion joints) include the following six:

  • Technical parameters of non-metallic compensators (non-metallic expansion joints):

Compensating segment length(h/m)

 

100200250300350400450500550600650700800900

Compensation volume(nm)

 

Axial displacement (x/m)

-30-50-75-85-105-125-130-140-165-175-195-205-225-240
+15+20+30+36+45+45+50+55+58+62+66+70+74+80

Lateral displacement (y/m)

±10±15±25±30±45±50±60±68±7o±73±75±80±85±90

Working Temperature (t°C)

a=100-200,b=200-300,c=300-450,d=450-500,e=500-600,f=600-700,g=700-1000

Working pressure P(Kpa)

±10~±300,if the user requires, the pressure beyond the range, can be designed separately.

Flow rate

a——bv=8——15
c——dv=8——20

 

  • Applied range of non-metallic compensators (non-metallic expansion joints):

Gas turbine exhaust duct

Desulfurization system

Flue ducts and exhaust systems of various industries

Coal-fired boilers, circulating sulfurized bed boilers

Flue ducts of waste heat boilers

 

3. Fiber fabric compensators / expansion joints

Fabric compensators, or fiber fabric compensators, possess several key features:

- Compensation: They effectively compensate for axial and angular displacement.
- Characteristics: These compensators offer no thrust, simplified support design, corrosion resistance, high temperature resistance, noise reduction, and vibration isolation.
- Ideal Application: Fabric compensators are particularly suitable for use in hot air ducts and flue ducts.

Parameters Table for Circular Non-metallic Compensators/Expansion Joints:

 

Circular product specifications

DwD1D2D3bd

Number of bolt holes(n)

mm

Φ10810820016411010144
Φ1591592512151618
Φ219219311275221
Φ27327336533027512
Φ325325427385327
Φ377377479435379
Φ426426528490428
Φ4804805955404831218
Φ530530645600533
Φ630630745700633
Φ72072084380072316
Φ82082094390082320
Φ92092010431000923
Φ102010201153110010231422
Φ1120112012531200t123
Φ12201220135313001223
Φ1320132014531400132324
Φ142014201553150014231628
Φ1820182019631910182326
Φ2020202021632110202332
Φ222022202363231022231836
Φ2420242025632510242340
Φ28202820298329152823203244
Φ322032203383331532232252
Φ3620362037833715362356

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