Pipeline heaters are divided into two types: liquid and gas heating. The two differences are that the internal heating core heating tube surface load design is different, and the liquid pipeline heater has an additional drain valve for later maintenance and maintenance. The normal design pressure is 1. MPA, which is equivalent to a working pressure of 10 kg. If a design pressure greater than 1.0 MPA is required, the thickness of the prosthesis cylinder and flanges need to be redesigned and processed. The outlet temperature of the gas pipeline heater can reach 700 degrees. At that time, the internal heating tube needs to be made of 310S high temperature resistant material heating tube, and the cylinder material is 304.