The service life of the preheating tube depends on many factors, such as material quality, manufacturing process, operating environment, maintenance, etc. Generally speaking, with correct use and maintenance, the service life of high-quality preheating tubes can reach more than 5,000 hours. If the preheating tube is used in a harsh environment, such as high temperature, high pressure, corrosion, etc., its service life may be affected to a certain extent. In order to extend the service life of the preheating tube, regular cleaning and maintenance are required to keep the tube clean and intact. At the same time, it is also necessary to strictly follow the operating procedures to avoid overload operation and illegal operations.