Three layer PE polyethylene inner epoxy powder coating composite anti-corrosion steel pipe is also a type of 3PE anti-corrosion steel pipe, but it has more inner epoxy powder anti-corrosion than 3PE anti-corrosion steel pipe, so it is usually called TPEP anti-corrosion steel pipe. This type of steel pipe usually needs to be processed first through the process of producing coated steel pipes. After epoxy coating is applied to the inner wall of the steel pipe, it is then wrapped with multiple layers of polyethylene on the production line of 3PE anti-corrosion steel pipes