Flange connection of internal and external epoxy resin powder coated steel pipes refers to welding a flange on each end of the steel pipe. When installing the coated pipe, the flanges are tightly connected together with bolts. It should be noted that flange gaskets must be installed between the two flanges, which can effectively improve the sealing of the pipe.
Double flange connection of internal and external epoxy resin powder coated steel pipes is generally not restricted by the conveying medium, and the epoxy powder coating layer has a strong bonding force with steel. The advantages of double flange connection of internal and external epoxy resin powder coated steel pipes are convenient on-site installation, time saving, simple disassembly, time-saving and labor-saving maintenance and replacement, and are generally used for pipeline lines with low pressure.
Flange connection of internal and external epoxy resin powder coated steel pipes uses a large number of bolts and gaskets, which increases the cost of the pipeline and the difficulty of installation. In addition, the flange gaskets of flange connection of plastic coated steel pipes are affected by the conveying medium and need to be regularly maintained or replaced.

The flanges used to connect internal and external epoxy resin powder coated steel pipes have nominal pressures of 0.6 MPa, 1.0 MPa, 1.6 MPa, and 2.5 MPa. Flanges of different pressures need to be used according to the design requirements of the coated pipeline project.