Overview
3PE‑coated steel pipe is a high‑performance composite pipeline designed for long‑term underground and subsea service. Its three‑layer polyethylene coating creates a robust protective barrier that resists corrosion, mechanical damage, and environmental aging, making it the preferred choice for oil, natural gas, water supply and drainage, and various industrial piping applications worldwide.
Structure and Composition
The 3PE coating system consists of a three-layer integrated composite coating, with each layer serving a distinct function:
Fusion‑bonded epoxy (FBE) primer (thickness > 100 µm)
The innermost layer exhibits exceptionally strong adhesion to the steel pipe substrate, forming a chemically resistant base that prevents rust formation at its source.
Copolymer adhesive interlayer (thickness 170–250 microns)
A functional intermediate transition layer bonds the epoxy powder coating to the polyethylene outer layer, ensuring the overall structural integrity of the coating and preventing delamination under temperature fluctuations and mechanical stress.
High-density polyethylene (HDPE) outer layer (thickness 1.8–3.7 mm)
The external protective layer boasts high mechanical strength, impact resistance, and impermeability, effectively shielding the structure from external forces and various corrosive agents in the environment.
Main Technical Parameters
| Parameter | Details |
|---|---|
| Nominal diameter | DN50～DN2200 |
| Outer diameter range | 219.1 mm to 4064 mm (8 inches to 160 inches) |
| Wall thickness | 3.2 mm to 40 mm (customizable) |
| Standard fixed length | 6 m to 18 m (custom lengths available) |
| Coating Implementation Standard | SY/T0413-2002, GB/T 23257-2009, DIN 30670, ISO 21809-1 |
Core Advantages
Excellent corrosion resistance
The three-layer composite structure creates a dense water‑tight barrier, effectively isolating the steel pipe from moisture, oxygen, and corrosive media, thereby extending the pipeline’s service life to over 30 years.
Strong mechanical protection capability
The high-density polyethylene outer layer is impact-resistant and wear-resistant, with excellent low-temperature toughness, making the pipe less prone to damage during transportation, installation, and operation.
Excellent sealing performance
The coating forms a seamless, integral bond, effectively preventing leakage of the internal fluid while also blocking the ingress of external groundwater, thereby ensuring the pipeline’s long-term safe and stable operation.
Durable and economical, with low life-cycle costs.
Significantly reduce the frequency of post‑construction maintenance and replacements, thereby substantially lowering the long‑term operating costs of large infrastructure projects.
Construction is efficient and convenient.
The outer surface is smooth, resulting in low friction during installation; the pipes are manufactured to standardized lengths, with consistent coating quality, which simplifies the installation process and shortens the project schedule.
Main application areas
Oil and gas industry
Long-distance trunk pipelines, oil and gas gathering and transmission pipelines, and subsea pipelines provide reliable corrosion protection for the transportation of oil and gas media.
Water Supply and Drainage Engineering
Urban water supply networks, sewage treatment pipelines, and long-distance water transmission projects are designed to withstand the dual corrosive environments of clean water and wastewater.
Chemical and Petrochemical Plant Area
It conveys various corrosive fluids and process media, while offering both chemical resistance and high‑strength mechanical protection.
District heating, cooling, and refrigeration pipeline network
Hot water and steam transmission pipelines that provide both corrosion protection and auxiliary thermal insulation.
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3PE-coated steel pipe
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Hengtong Pipe Fittings Group
Hebei Hengtong Pipe Fitting Group manufactures steel fittings with integrated R&D, production, sales and services. With independent IP rights, we focus on two core product lines: concrete pump components and premium industrial pipe fittings.
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Phone:+86-13283241111
Email: rae@htpipefittings.com
howard@htpipefittings.com
Address: Zhenggang Industrial Park, Yanshan County, Cangzhou City, Hebei Province, China
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