The flange connection of inner and outer epoxy resin powder coated steel pipes refers to welding a flange on each end of the steel pipe. The pipeline connection method of tightly connecting flanges together with bolts during the installation of coated pipes. It should be noted that flange gaskets must be installed between the two flanges, which can effectively improve the sealing of the pipeline. Double flange connection of inner and outer epoxy resin powder coated steel pipes is generally not restricted by the conveying medium