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1. Expansion joints(compensators)
Expansion joints, also known as compensators, encompass an elastic bellows (or multiple bellows) as their primary operative element, coupled with end connectors, supports, flanges, conduits, and associated accessories. These flexible structures are installed on vessel shells and pipelines to mitigate stresses induced by temperature fluctuations and mechanical vibrations. By leveraging the bellows' ability to expand and contract efficiently, they compensate for dimensional alterations in pipelines, conduits, vessels, and the like, stemming from thermal expansion and contraction. They also accommodate axial, lateral, and angular displacements in these systems. Additionally, they offer noise and vibration reduction, making them valuable in heating supply systems. To prevent deformation or damage to heating pipelines due to thermal expansion or temperature stress, compensators are installed to absorb such expansion, thereby reducing stress on pipeline walls and minimizing forces on valves or supporting structures.
As elastic compensating components that facilitate unimpeded expansion and contraction, expansion joints boast reliable operation, superior performance, compact design, and numerous other benefits. Consequently, they are extensively utilized in industries such as chemical engineering, metallurgy, nuclear energy, and more. The forms of expansion joints used on vessels vary, with U-shaped bellows being the most prevalent, followed by Ω-shaped and C-shaped joints. Meanwhile, pipeline expansion joints are categorized based on structural compensation, including universal, pressure-balanced, hinged, and gimbal expansion joints.
| Main Item | Classification | Description |
Metal Expansion Joint | ElbowExpansion 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
| The bellows expansion joint, crafted from metal, enables axial expansion/contraction and slight bending. Protective rods/rings and guide supports safeguard its ends to prevent over-compensation. Angular and lateral versions compensate for rotational and lateral deformations. Advantages include space-efficiency, material savings, standardization, and mass production, but lifespan is shorter. It's typically used in short, low-temp/pressure pipelines. With technological advancements, its application range is expanding, now supporting pipe systems up to 6.0 MPa. | |
Slip-Type Expansion Joint | The slip-type expansion joint comprises inner and outer sleeves capable of relative axial movement, sealed by a stuffing box. It compensates for axial expansion and rotation of pipelines by any angle. With sleeves, shells, and sealing materials, it's compact yet offers significant compensation. Ideal for hot water, steam, and grease, it slides to compensate thermal expansion. Its inner sleeve, connected to the pipeline, utilizes high-performance self-sealing dynamic seals for free sliding and sealing. Using synthetic material seals, it withstands high temperatures, corrosion, and aging. It ensures axial sliding and prevents medium leakage within the pipe.. | |
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 | The fabric expansion joint is mainly made of fiber fabric, rubber, and other high temperature resistant materials. It can compensate for the vibration and deformation of fans and ducts.Fabric expansion joints can compensate for axial, lateral, and angular products, with features such as no thrust, simplified support design, corrosion resistance, high temperature resistance, noise reduction, vibration reduction,and others.It is particularly suitable for hot blast pipes and smoke and dust pipeline of power plant.The non-metallic compensator's fiber fabric and insulation cotton itself have the functions of sound absorption and vibration isolation, therefore they can effectively reducing the noise and vibration of boiler, fan, and other systems. Simple structure, light weight, and easy maintenance. |
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. Metal Expansion joints(compensators)
