The 3-layer PE anti-corrosion spiral seam welded steel pipe is referred to as 3PE anti-corrosion steel pipe. It combines the excellent properties of two anti-corrosion layers, epoxy coating and extruded polyethylene, and combines the characteristics and chemical resistance of the epoxy coating with the mechanical protection characteristics of the extruded polyethylene anti-corrosion layer. 3-layer PE anti-corrosion is an ideal external anti-corrosion layer for buried pipelines, and buried pipelines using 3PE anti-corrosion technology can be used for up to 50 years.