There is a wide variety of expansion joints used in power plants, classified mainly according to their function, shape, and use. Here are a few expansion joint types commonly used in power plants:
Elbow expansion joint: Also known as tension bending, it bends a tube into a U-shape or other shape. The expansion joint makes use of the elastic deformation ability of the shape to compensate, and has the advantages of good strength and long service life, but the disadvantages are large space occupation, more steel consumption and large friction resistance. Elbow expansion joints are commonly used on various steam pipes and long pipes.
Bellows Expansion Joint: This expansion joint is made of metal bellows that expands and contracts along the axis of the pipe and allows a small amount of bending. Bellows expansion joints are commonly used on pipes that are not very high in temperature and pressure and are short in length. With the improvement of corrugated pipe production technology, the application range of this type of expansion joint is expanding, and it can be used in pipe systems with a maximum pressure of 6.0 MPa at present.
Sleeve type expansion joint: It is composed of inner and outer sleeves that can make axial relative movement, and the inner and outer sleeves are sealed by packing. This expansion joint needs to keep the tubes at both ends moving on one axis when used.
In addition, other types of expansion joints may be used in power plants, such as straight tube pressure balanced expansion joints, unconstrained expansion joints, composite tie rod transverse expansion joints, etc. These expansion joints have their own characteristics and applicable scenarios, which can meet the needs of different pipeline systems in power plants.
Please note that when choosing expansion joints in power plants, they need to select according to the specific pipeline system, working environment and use requirements to ensure the best performance and effect of the expansion joints. At the same time, the installation, maintenance and inspection of expansion joints also need to be carried out in accordance with relevant regulations and standards to ensure their safe and reliable operation.