Application Scope of 3PE Anti-Corrosion Steel Pipes for Drinking Water
Release time:
2022-05-25
3PE anti-corrosion steel pipes are suitable for various working environments. To slow down or prevent corrosion and degradation of pipelines caused by chemical and electrochemical reactions from external media or the metabolic activities of microorganisms, two or three layers of polyethylene (3PE) are coated onto the outer wall of the pipe, thereby providing effective corrosion protection. The service life of 3PE-coated pipes is 3 to 5 times longer than that of pipes with a single-layer fusion-bonded epoxy coating (≥ 80 μm); the intermediate layer consists of an adhesive (170–250 μm), while the outer layer is extruded polyethylene (approximately 2 mm). The total thickness of the protective coating is roughly between 1.8 and 3.7 mm.
3PE anti-corrosion steel pipe Suitable for various working environments. To slow down or prevent corrosion and degradation of pipelines caused by chemical and electrochemical reactions from external media or the metabolic activities of microorganisms, two or three layers of polyethylene (3PE) are applied to the outer wall of the pipeline, providing effective corrosion protection. The service life of 3PE-coated pipes is 3 to 5 times longer than that of pipes with a single-layer fusion-bonded epoxy coating (≥ 80 μm); the intermediate layer consists of an adhesive (170–250 μm), while the outer layer is extruded polyethylene (approximately 2 mm). The total thickness of the protective coating ranges from about 1.8 to 3.7 mm.
3PE anti-corrosion steel pipes feature excellent sealing performance, which can significantly save energy, reduce costs, and protect the environment over their long-term operation. The construction units demonstrate strong corrosion resistance and strictly adhere to established procedures, ensuring a service life of 30 to 50 years. These pipes also exhibit excellent corrosion resistance and impact resistance at low temperatures, with a very low water absorption rate for PE (less than 0.01%). Meanwhile, the epoxy resin boasts high strength, polyethylene has low water absorption, and the hot-melt adhesive offers good flexibility and high corrosion-resistant reliability.
3PE anti-corrosion steel pipes boast advantages such as light weight, high strength, thermal insulation, sound insulation, flame retardancy, cold resistance, corrosion resistance, non-absorbency, and rapid installation. They have become indispensable materials in industries including construction, transportation, petroleum, chemical engineering, power generation, and refrigeration. 3PE anti-corrosion steel pipes are used for corrosion and thermal insulation protection of various indoor and outdoor pipelines, district heating pipelines, localized air-conditioning pipelines, and industrial pipelines in the chemical industry. Since the emergence of 3PE decomposition data in the 1930s, this material has rapidly developed as an excellent thermal insulation and anti-corrosion solution, with its application scope becoming increasingly widespread. Due to its robust structure, energy efficiency, and superior anti-corrosion performance, it is widely employed in various pipelines for heating, refrigeration, oil transportation, steam transmission, and more. It finds extensive use in pipelines for heating, refrigeration, oil transportation, and steam transmission, among other applications.
The base materials for 3PE anti-corrosion steel pipes include seamless steel pipes, spiral steel pipes, and straight-seam steel pipes. The three-layer polyethylene (3PE) anti-corrosion coating—thanks to its excellent corrosion resistance, water permeability, air permeability, and mechanical properties—has been widely adopted in the petroleum pipeline industry. The anti-corrosion layer of 3PE-coated steel pipes is crucial to the service life of buried pipelines. Some pipelines made of the same materials have remained intact underground for decades without showing any signs of corrosion, whereas others have leaked within just a few years—simply because they employ different external anti-corrosion coatings.
The 3PE anti-corrosion steel pipe (three-layer polyethylene) process is an advanced anti-corrosion technology introduced from abroad in the late 1990s. Its full name is fusion-bonded epoxy/extruded polyethylene structural protective coating. The 3PE anti-corrosion technology combines the excellent properties of epoxy coatings and extruded polyethylene anti-corrosion coatings, integrating the interfacial characteristics and chemical resistance of epoxy coatings with the mechanical protection features of extruded polyolefin anti-corrosion coatings, thereby significantly enhancing the performance of each component. Its key features include high mechanical strength, wear resistance, corrosion resistance, heat resistance, and cold resistance. It can be used at moderate temperatures up to 150 degrees Celsius and is well-suited for use in cold regions. Therefore, the 3PE anti-corrosion coating is an ideal external anti-corrosion layer for buried pipelines. According to inspections conducted by authoritative agencies, buried pipelines coated with the 3PE anti-corrosion technology can have a service life of up to 50 years.
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