What Is HDPE [Double Resistance] Pipe? How Is It Different from Ordinary PE Pipe?

HDPE mining pipes are made from high-density polyethylene (HDPE) as the base material, with the addition of conductive carbon black (antistatic agent) and flame retardants (such as decabromodiphenyl ether and antimony trioxide). After special modification and granulation, these materials are used to produce the pipes.

This type of pipe not only possesses the inherent advantages of HDPE such as high strength, corrosion resistance, wear resistance, and light weight, but also meets the antistatic and flame-retardant performance requirements of the coal industry standard MT 558.1-2005 "Plastic Pipes for Coal Mine Underground Use Part 1: Polyethylene Pipes." Therefore, HDPE mining pipes are widely used in underground coal mine applications such as gas drainage, water supply and drainage, and ventilation.

2. Characteristics of HDPE Double Anti-corrosion Pipe

- Flame retardant and anti-static (the core differences from ordinary PE pipes)

During the production process of PE twin-antistatic pipes, antistatic agents and flame retardants are uniformly incorporated, ensuring that their performance does not degrade over time. These pipes not only meet the coal industry standard MT558.1-2005, but are also particularly suitable for underground environments that are flammable and explosive.

Lightweight and easy to install

The pipe material has a low density; compared to steel pipes and fiberglass pipes, its weight is significantly reduced, making transportation and installation more convenient, lowering the intensity of downhole operations, and improving construction efficiency.

● Corrosion resistance and scale prevention

In high-sulfur water quality or environments containing calcium and magnesium ions, the pipe material exhibits excellent corrosion resistance and anti-scaling properties, saving costs on corrosion prevention and descaling, and extending service life.

Self-lubrication and flexibility

The inner wall is smooth, resulting in much lower conveying resistance compared to steel pipes and fiberglass pipes, thereby increasing conveying capacity. At the same time, it has good flexibility and can adapt to geological subsidence and complex working conditions.

● Anti-aging and wear resistance

The pipe material exhibits excellent anti-aging performance and retains its toughness even at low temperatures. According to tests, its wear resistance is approximately four times higher than that of steel pipes, significantly extending its service life.

- Impact resistance and high toughness

The low-temperature embrittlement temperature is extremely low, featuring high elongation at break and impact resistance, effectively reducing damage.

● Flexibility and easy connection

The pipe has good flexibility, allowing it to bend easily where needed. Meanwhile, the mining PE pipe uses methods such as hot-melt connection, pipe clamp connection, or flange connection, making the construction process simple and convenient.

3. Application Fields of HDPE Double Anti-corrosion Pipes

Due to its unique properties, PE double-walled pipe is widely used in various pipeline systems underground in coal mines, including:

● Gas extraction pipe

● Water supply and drainage pipes

● Spray Dust Suppression Pipe

● Ventilation duct

● Negative pressure pipeline

In addition to coal mines underground, PE dual-resistant pipes can also be seen in special environments requiring flame retardancy and antistatic properties, such as some petrochemical plants and power plants.

4. Industry Standards and Safety Signs

In order to ensure the quality and safety of polyethylene pipes for coal mines, the state has formulated corresponding industry standards, such as:

● MT 558.1-2005

Plastic pipes for underground coal mines—Part 1: Polyethylene (PE) pipes

● AQ1071-2009

Safety Technical Requirements for Non-Metallic Gas Transmission Pipes Used in Coal Mines

These standards provide important guidance and basis for the production, inspection, and application of polyethylene pipes used in coal mines.

In addition, polyethylene pipes used in coal mines must obtain a Coal Mine Safety Mark Certificate (CMSC) before being put into use. This certificate is a necessary proof to ensure that the pipes meet national safety standards and can be safely used in coal mine environments.