Question: For PTFE-lined steel pipes with flanges, are additional gaskets needed during installation?

When installing steel-lined PTFE pipes with flanges, whether additional gaskets are needed depends mainly on the flange connection method and the required sealing performance. Generally, pipe flanges lined with PTFE offer excellent sealing performance, as PTFE itself possesses good chemical stability and a low friction coefficient. If the manufacturing and installation processes are properly controlled, with the flange surfaces being flat and clean and the preload on the flange bolts being appropriate, no additional gaskets are theoretically needed. However, in practice, poor sealing may occur due to reasons such as uneven flange surfaces or inconsistent bolt pre-tension; in such cases, gaskets may need to be added to improve the sealing performance of the connection. If the environmental requirements are very strict and high pressures must be withstood, gaskets may also be needed to ensure no leaks occur. It is important to note that the material of the gasket used must be compatible with the fluid medium, as well as capable of withstanding the operating temperature and pressure conditions, in order to ensure the reliability of the connection and the safe operation of the system. Therefore, whether gaskets need to be added specifically depends on a comprehensive assessment of the actual installation conditions, the requirements of the piping system, and the design standards. In some cases, it is possible to seek advice from pipe manufacturers or relevant technical experts. .

I feel like, hey, it might be pretty good

No additional addition is needed; the flange edge serves as a gasket