What are some tips for selecting bellows expansion joints?

Release time:

2021-04-19

Compensators are traditionally also referred to as expansion joints. They consist of a bellows—a flexible element—and associated components. The bellows is the primary working component, while the associated components include end pipes, supports, flanges, and guides. These components collectively constitute the compensating element. The bellows, as the core working part, undergoes effective expansion and contraction, absorbing dimensional changes in pipelines, conduits, and vessels caused by thermal expansion and contraction, or compensating for axial, lateral, and angular displacements in these systems.

Compensators are traditionally also referred to as expansion joints. They consist of a bellows. ( An elastic element ) Consisting of a bellows and accessories, the bellows is the primary component responsible for its operation. The accessories include end tubes, supports, flanges, and guide tubes. It is classified as a compensating element. The bellows—its working component—undergoes effective expansion and contraction to absorb dimensional changes in pipelines, conduits, and vessels caused by thermal expansion and contraction, or to compensate for axial, lateral, and angular displacements in these components. It can also be used to reduce noise and vibration.

What are some tips for selecting bellows expansion joints?

Bellows are widely used in modern industry. In heating systems, to prevent deformation or damage to heating pipelines caused by thermal expansion or temperature-induced stresses, compensators must be installed along the pipelines to accommodate thermal expansion, thereby reducing stress on the pipe walls and minimizing the forces exerted on valves and support structures.

The compensator features a rectangular cross-section and circular corrugations, allowing a single expansion joint in the pipeline to accommodate two-dimensional displacement. An elbow pipe composed of two expansion joints can handle three-dimensional displacement. Rectangular and circular metal bellows expansion joints are available in both full-height and half-height versions. Users can select multi-segment designs based on flue gas duct dimensions and stress-strain requirements.

1. After selecting the appropriate compensator based on the thermal displacement of the piping system, the user must provide at least the circulating medium in the pipeline, the design pressure of the flue gas duct, the operating temperature during operation, and the overall dimensions of the flue gas duct’s cross-section. ( Length and width ) The selected waveform ( Full height 216mm , half-height 108 mm) Wave number ( The single-wave number of a single corrugation does not exceed. 6 wave ) in order to design and manufacture compensator structures.

2. Allowable expansion per wave : Full-height △ α = 24 mm , half-height △ α = 12 mm 。

3. Dust-blocking plate : Ducts or pipelines with low dust levels must not be used; flues with high dust concentrations should be equipped with dust baffles.

4. To reduce the number of nodes in a bellows, it is advisable to consider: 50 Cold drawing.

5. This compensator is suitable for cross-sectional areas less than 4.6 Square meters, the external dimension of the flue on one side is less than 1.5 Mi is greater than 0.6 Millimeter-level occasions .. Standard full-height corrugated expansion joints are suitable for all flue and air ducts.

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