Flange heating pipe flanges are generally divided into threaded flanges and plane flanges. The sizes of threaded flanges are generally 1 inch, 1.2 inch, 1.5 inch, and 2 inch. For small power heating, the general power is set to several kilowatts to dozens of kilowatts. Plane flanges are available in sizes from DN10 to DN1200. Different powers are designed according to customer requirements. Generally, high-power flange heating pipes are flat flanges, ranging from several kilowatts to hundreds of kilowatts. The surface power is large, which is 2 to 4 times the surface load of air heating.