Beijing Hownew Energy Technology Group Co., Ltd
Hownew Energy Technology Group Co., Ltd.
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1. Expansion joints(compensators)
Expansion joints, also known as compensators, are vital components in managing structural integrity under varying thermal and mechanical conditions. They typically comprise one or more bellows—an elastic element functioning as the primary compensating mechanism—accompanied by end connectors, supports, flanges, conduits, and other ancillary components. Installed in vessel shells or pipelines, these flexible structures are engineered to alleviate stresses induced by temperature fluctuations and mechanical vibrations.
The primary function of expansion joints is to accommodate the dimensional alterations within the systems they are part of, such as pipelines, conduits, and vessels. These changes often result from thermal expansion and contraction. Additionally, expansion joints manage axial, lateral, and angular displacements that can impact system functionality. Beyond structural compensation, they play crucial roles in mitigating noise and vibration, particularly in heating supply systems. To prevent damage from thermal expansion or stress during heating cycles, compensators are strategically installed within pipelines, thereby minimizing the load on pipeline walls and mitigating force exertion on valves and support structures.
Owing to their intrinsic elasticity that allows for free expansion and contraction, expansion joints are recognized for their reliable performance, durability, and compact design. This has led to their widespread application across various industries, including chemical engineering, metallurgy, and nuclear energy. Within these sectors, different forms of expansion joints are deployed based on the specific requirements of the vessel or pipeline. The most commonly utilized shapes include U-shaped, Ω-shaped, and C-shaped bellows. From a structural compensation perspective, expansion joints are categorized into several types, namely universal expansion joints, pressure balanced expansion joints, hinged expansion joints, and gimbal expansion joints, each tailored to specific operational needs and environmental conditions. This diversity in design and function underscores the critical role of expansion joints in modern industrial applications.
| Main Item | Classification | Description |
| Metal Expansion Joint | ElbowExpansion Joint | Tension bends, shaped into U or other forms, are expansion joints that use elastic deformation for compensation. Advantages include robust strength, durability, and adaptability for on-site production. However, they are space-intensive, require substantial steel, and produce high friction resistance. Commonly, these joints are employed in steam piping and extensive pipeline systems. |
| Bellows Expansion Joint
| Bellows expansion joints are flexible, metal-constructed connectors that can expand, contract, and bend slightly along the axial direction. They feature protective rods or rings and guide supports to manage movement and prevent over-extension. These joints are compact, cost-effective, and suitable for mass production, but have a shorter lifespan compared to other types. Typically used in low-pressure, short pipelines, their applications are growing with advances in manufacturing, supporting pressures up to 6.0 MPa. They are particularly useful for managing rotational and lateral pipeline deformations. | |
| Slip-Type Expansion Joint | Slip-type expansion joints feature a design with inner and outer sleeves that allow axial movement and rotation to accommodate thermal expansion in pipelines. These joints are sealed with a stuffing box to prevent leaks and ensure that the pipes remain aligned. Notable for their compact size and substantial compensation capability, they are ideal for handling hot water, steam, and oily media. Utilizing high-performance synthetic materials for seals, these joints provide durability, high temperature tolerance (up to 350 degrees Celsius under special conditions), and corrosion resistance. They effectively manage axial expansion and ensure reliable sealing in dynamic conditions. | |
| Non-metallic Expansion Joint | Rubber Expansion Joint | Rubber expansion joints, consisting of rubber and rubber-fiber materials along with steel flanges and sleeves, serve as flexible connectors for fans and ducts. They are primarily used to absorb shocks, reduce noise, seal, and resist various media. These joints facilitate easy installation and displacement, making them perfect for environmental protection applications, especially in systems that handle smoke and dust. |
| Fabric Expansion Joint | Fabric expansion joints are crafted from fiber fabric, rubber, and other materials resistant to high temperatures. They address vibrations and structural deformations in fans and ducts, compensating for axial, lateral, and angular shifts. These joints feature no thrust, corrosion resistance, high temperature tolerance, and sound and vibration damping, making them ideal for power plants' hot blast and dust pipelines. Their simple, lightweight design allows for straightforward 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)
