An expansion joint is a flexible element that effectively compensates for axial deformation. For instance, the expansion joint mounted on the shell of a fixed tube sheet heat exchanger has high axial flexibility and is easy to deform, allowing it to compensate for the thermal expansion difference between the tubes and the shell due to different wall temperatures, thus reducing their axial load. This in turn minimizes the temperature difference stress on the tubes, tube sheets, and shell, avoiding strength failure, instability failure, and tube pull-out failure. There are various types of expansion joints, with common ones including bellows, welded ring plates, and cladded designs. The bellows type is widely used, while the welded ring plate type is only suitable for atmospheric or low-pressure conditions.
Expansion joints, also commonly referred to as compensators or flexible joints, consist of the bellows (a type of elastic element) that form the core, along with end pipes, brackets, flanges, conduits, and other accessories. These joints are designed to compensate for additional stresses caused by temperature differences and mechanical vibrations, and are installed on vessel shells or pipelines as flexible structures. By utilizing the effective伸缩 deformation of the bellows, they can absorb size changes in pipelines, conduits, and vessels due to thermal expansion and contraction, or compensate for axial, lateral, and angular displacements of pipelines, conduits, and vessels. They can also be used for noise reduction and vibration control, and in heating applications. To prevent pipeline deformation or damage caused by thermal expansion or temperature stress as the heating pipeline warms up, compensators need to be installed on the pipeline to compensate for thermal expansion, thereby reducing stress on the pipe walls and the forces acting on valve or bracket structures.
Flexible expansion joints, as elastic components capable of free expansion and contraction, offer reliable operation, excellent performance, and compact structure, and are widely used in industries such as chemicals, metallurgy, and nuclear energy. The expansion joints used on vessels come in various forms, with U-shaped expansion joints being the most widely used, followed by Ω-shaped and C-shaped ones. In pipelines, expansion joints are categorized by their structural compensation methods, including universal, pressure-balanced, hinge-type, and universal joint-style.
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