Flanged heating tube The flanges are generally divided into threaded flanges and flat flanges. The sizes of threaded flanges are generally 1 inch, 1.2 inch, 1.5 inch, and 2 inch. The threaded flange tube is generally suitable for heating with small power , The general power is set to several kilowatts to dozens of kilowatts. Flat flanges are available in sizes from DN10 to DN1200, and different powers are designed according to customer requirements. Generally, high power flange heating pipes are flat flanges used, ranging from several kilowatts to hundreds of kilowatts. The surface power is large, which is 2-4 times the surface load of the air heating.