**Anti-Corrosion Steel Pipes**

Anti-corrosion steel pipes encompass various types, including PEEP anti-corrosion steel pipes, plastic-coated anti-corrosion steel pipes, water supply anti-corrosion steel pipes, TPEP anti-corrosion steel pipes, epoxy resin anti-corrosion steel pipes, plastic-coated composite pipes, large-diameter anti-corrosion steel pipes, steel-sleeved steel pipes, steam insulation pipes, 3PE anti-corrosion steel pipes, FBE pipes, 3PP anti-corrosion steel pipes, insulation pipes, external 3PE steel pipes, external 3PE internal plastic-coated steel pipes, and external 3PE internal epoxy-coated steel pipes.

**Application Fields:**

- Gas pipeline engineering

**Connection Method:**

- Welded connection

**Product Brand:**

- Hebei Huaheng Pipeline Equipment Manufacturing Co., Ltd.

**Overview:**

The 3PE anti-corrosion steel pipe refers to a steel pipe externally coated with a three-layer polyethylene structure (MAPEC), which is a widely used anti-corrosion pipeline in China. Other anti-corrosion methods include IPN8710, FBE epoxy powder, and epoxy coal tar.

**3PE Anti-Corrosion Steel Pipe**

**Product Description:**

The 3PE anti-corrosion steel pipe features a three-layer polyethylene coating (MAPEC) applied to the external wall of the pipe. It is commonly used for external corrosion protection of seamless steel pipes, spiral steel pipes, and straight-seam steel pipes. The three-layer polyethylene (3PE) coating is extensively utilized in the petroleum pipeline industry due to its superior corrosion resistance, water vapor impermeability, and mechanical properties. The anti-corrosion layer is critical to the lifespan of buried pipelines; pipes of the same material may remain intact for decades or corrode within years, depending on the external anti-corrosion coating applied.

**Anti-Corrosion Structure:**

**External Wall Coating Configuration:**

The 3PE anti-corrosion system typically comprises three layers:

1. **First Layer:** Epoxy powder (FBE > 100μm)

2. **Second Layer:** Adhesive (AD, 170–250μm)

3. **Third Layer:** Polyethylene (PE, 1.8–3.7mm)

During production, these three materials are fused into a unified layer through processing methods such as *winding* or *round mold coating*, ensuring strong adhesion to the steel pipe.

The 3PE coating combines the European 2PE anti-corrosion layer with the epoxy powder (FBE) coating widely adopted in North America. This hybrid innovation has been globally recognized and applied for over a decade.

**Coating Composition:**

- **Base Layer:** Epoxy powder coating in direct contact with the steel pipe surface.

- **Intermediate Layer:** Copolymer adhesive with branched functional groups.

- **Outer Layer:** High-density polyethylene (HDPE) coating.

The 3PE coating integrates the high impermeability of epoxy resin and the mechanical robustness of polyethylene, making it the globally acknowledged optimal solution for pipeline corrosion protection.

**Domestic Standard:**

Complies with **GB/T23257-2017** (China National Standard).

**Applications:**

3PE anti-corrosion steel pipes are suitable for:

- Long-distance oil and gas transmission pipelines

- Water supply pipelines

- Sewage treatment pipelines

- External anti-corrosion of steel-sleeved steam transmission pipelines

**Manufacturing Process:**

Key steps include:

1. External pipe wall shot blasting for rust removal

2. Heating via medium-frequency electric induction or natural gas furnace

3. Epoxy powder spraying

4. Adhesive extrusion winding

5. Polyethylene extrusion winding

6. Water cooling

7. Trimming of pipe-end coatings

8. Quality inspection, marking, and storage

**Processable Diameters:**

- Minimum: Φ89mm

- Maximum: Φ3020mm

**Advantages:**

1. **Extended Lifespan:** Anti-corrosion insulated steel pipes exhibit a service life of 30–50 years, significantly reducing maintenance costs when properly installed.

2. **Resource Efficiency:** Long-term operation reduces energy consumption and lowers overall costs.

3. **Superior Performance:** Exceptional waterproofing, corrosion resistance, and impact resistance under low-temperature conditions.

4. **Installation Flexibility:** Direct burial in soil, water, or permafrost without auxiliary trenches, simplifying construction and reducing project costs.

5. **Mechanical Durability:** Combines high-density polyethylene's toughness with epoxy resin's chemical stability, ensuring reliability in harsh environments.

This translation employs precise technical terminology and maintains the structural clarity of the original content, ensuring alignment with industry standards and professional documentation requirements.