One of the key differences between 3PE anticorrosive steel pipes and plastic-coated pipes lies in their definitions.
Plastic-coated pipes, also known as plastic-coated composite steel pipes, steel-plastic pipes, or plastic-coated composite steel pipes, are based on steel pipes. They use high-pressure polyethylene or epoxy resin as the primary anticorrosive material through hot-dip forming. This is followed by a series of processes such as spraying, rolling, dipping, and degreasing to apply a polyethylene anticorrosive layer to the inner surface or an epoxy anticorrosive layer to both the inner and outer surfaces of the steel pipe. In contrast, 3PE anticorrosive steel pipes refer to steel pipes with a three-layer isoprene rubber coating for external anticorrosion. The base material can be seamless steel pipe, spiral welded pipe, or longitudinal welded pipe. Its anticorrosion structure comprises a layer of epoxy powder, a layer of adhesive, and a layer of polyethylene.
Another significant difference lies in their performance characteristics.
Plastic-coated pipes, due to their production process and anticorrosive materials, exhibit excellent corrosion resistance and resistance to high and low temperatures. Their superior insulation properties make them suitable as protective tubes for cables, minimizing the risk of leakage. They also demonstrate strong anti-interference capabilities, effectively shielding external signal interference when used as cable protection pipes. Additionally, they boast good rolling bearing pressure strength, capable of withstanding pressures up to 5Mpa. With smooth and burr-free walls, they can be applied as cable laying sleeves.
Meanwhile, 3PE anticorrosive steel pipes, thanks to their raw materials and production process, offer long service life, high content, good reliability, and resistance to aging. Under normal operating temperatures and pressures, their service life can exceed 50 years, allowing for long-term operation while saving significant resources and reducing energy costs. They also possess strong moisture and corrosion resistance, able to withstand chemical corrosion from petroleum, natural gas, vaporized gases, and artificial gases. Compounds in the soil do not degrade the pipeline. Furthermore, 3PE anticorrosive steel pipes are lightweight, easy to handle, and simple to install, allowing for direct burial in the ground or underwater without additional trenches. They can even be buried in frozen soil under certain environmental conditions.
