Non-metallic expansion joints for gas turbines (referred to as gas turbines for short) are specially designed for gas turbine systems to compensate for displacement of piping systems due to thermal expansion and contraction, mechanical vibration or installation errors. Gas turbine systems usually operate at very high temperatures and pressures, so the requirements for expansion joints are extremely stringent, requiring excellent resistance to high temperatures, corrosion and pressure, while also being able to withstand high-speed vibrations and periodic start-stop cycles.
The features of gas turbine non-metallic expansion joints include:
High temperature resistant material: The skin of the expansion joint is usually made of high temperature resistant materials, such as composite materials such as silicone rubber, fluororubber, polytetrafluoroethylene (PTFE), ceramic fiber or glass fiber, to withstand the high temperature generated during the operation of the gas turbine.
Sound absorption and vibration reduction: The gas turbine generates strong vibration and noise when it is operated, and the non-metallic expansion joint can absorb some of the vibration and reduce the noise level, protecting the pipeline system from damage.
High corrosion resistance: Gas turbine systems may contain corrosive media, and non-metallic materials usually have good chemical stability, which can resist corrosion and extend the service life of expansion joints.
Flexible compensation: Non-metallic expansion joints are able to compensate for axial, lateral, and angular displacements, which are particularly important for the complexity of pipe layouts in gas turbine systems.
Sealability: In high temperature and pressure conditions, good sealing performance is a must to prevent leakage and maintain system efficiency.
Quick response: Gas turbine systems often need to start and stop quickly, and non-metallic expansion joints can quickly adapt to temperature and pressure changes, ensuring the safety and reliability of the system.
Low maintenance: Non-metallic expansion joints are generally lighter than metal expansion joints, easier to install and maintain, reducing maintenance costs and downtime.
When designing and selecting a gas turbine non-metallic expansion joint, factors to consider include the size of the pipe, operating temperature, pressure, media characteristics, vibration frequency, and possible chemical reactions, among others. Manufacturers typically customize expansion joints according to specific application needs to ensure their performance meets the specific requirements of gas turbine systems. Additionally, regular inspections and maintenance are essential to keep the expansion joint in good condition and prolong its service life.