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Compensators* are also commonly referred to as expansion joints, or telescopic joints. It consists of a bellows (an elastic element) that forms the main part of its structure, along with accessories such as end tubes, supports, flanges, and conduits. It belongs to a type of compensation component. It utilizes the effective telescopic deformation of its working bellows to absorb dimensional changes in pipelines, ducts, vessels, etc., caused by thermal expansion and contraction, or to compensate for axial, lateral, and angular displacements of such components. It can also be used for noise reduction and vibration damping. It has a wide range of uses in modern industry. In terms of heating, in order to prevent the heating pipes from deforming or being damaged due to thermal expansion or temperature stress as they heat up, compensators need to be installed on the pipes to account for this thermal expansion. This helps to reduce the stress on the pipe walls as well as the forces acting on the valves or support structures. The compensator features a rectangular cross-section with rounded edges, and a single expansion joint in the pipeline accommodates displacement in two dimensional directions. The elbow pipe composed of 2 expansion joints can withstand displacements in three dimensions. Rectangular rounded-metal corrugated expansion joints are available in full-height and half-height versions; depending on the flue dimensions and stress-strain requirements, users can choose from multiple joint configurations. 1. After the user selects a suitable compensator based on the thermal displacement of the piping system, it is necessary to provide at least the following information: the medium flowing through the pipe, the design pressure of the flue duct, the maximum operating temperature, the overall dimensions (length and width) of the cross-section of the flue duct, the selected waveform (full height: 216 mm; half height: 108 mm), and the number of waves (the number of waves per corrugation must not exceed 6) so that the structural design and manufacture of the compensator can be carried out. 2. Maximum allowable expansion per wave: for full-height type, △α=±24mm; for half-height type, △α=±12mm. 3. Dust baffle: It may not be necessary to use one in air ducts or pipes with little dust, but dust baffles should be used in dusty flue ducts. 4. To reduce the number of convolutions in the bellows, cold drawing by 50% should be considered. 5. The compensator is suitable for applications where the cross-sectional area is less than 4.6 square meters, and where one of the external dimensions of the flue or air duct is less than 1.5 m but greater than 0.6 mm. The standard full-height bellows compensator is suitable for all flue and air ducts.