The main reason for the use of non-metallic expansion joint skins in power plants lies in their unique performance and advantages, which are particularly suitable for the complex and demanding operating environments in power plants. Here are a few key factors:
High temperature and corrosion resistance： In the process of power generation, steam, flue gas and combustion products are often at high temperatures and may be corrosive. The non-metallic expansion joint skin is made of high temperature resistant composite materials, such as silicone rubber, fluororubber, glass fiber, alkali-free cloth, etc. These materials have good high temperature and corrosion resistance, and can work stably in harsh environment for a long time.
Multi-directional compensation ability： The non-metallic expansion joint skin can provide compensation for axial, lateral and angular displacements, meaning it can handle the complex movement of the pipe in a smaller space, a flexibility that is difficult to achieve with metallic expansion joints.
Reduce weight： Compared to metal expansion joints, non-metallic expansion joints have lighter skins, which reduces the load on the piping system and support structure and simplifies the design and installation process.
Reduce vibration and noise： Non-metallic materials have good sound absorption and shock absorption properties, which can effectively reduce vibration and noise in the system and improve the overall operating environment of the power plant.
Reduce reverse thrust： The main body material is soft non-metallic fabric, which will not generate reverse thrust, which means that the use of large brackets and fixings can be avoided when designing, saving materials and labor.
Easy to maintain and replace： Non-metallic expansion joints are easier to disassemble and replace than metallic expansion joints after they are damaged or have reached their service life, reducing maintenance costs and downtime.
Sealability： The non-metallic expansion joint skin can provide good sealing and prevent gas or liquid leakage, which is essential for maintaining the efficiency and safety of the power plant.
Strong adaptability： Non-metallic expansion joints can be used for various shapes of pipe connections, including round, rectangular, etc., so that they can find suitable application scenarios in different types of power plants.
In summary, the non-metallic expansion joint skin is an indispensable component in power plants due to its excellent performance, especially in high temperature, high pressure and corrosive environments, it is able to provide an efficient, reliable and economical solution.