DN400 double-wall corrugated pipe for drainage, sewage, and rainwater systems, corrosion-resistant and pressure-resistant.

Double-wall corrugated pipe, fully known as High-Density Polyethylene Double-Wall Corrugated Pipe (HDPE double-wall corrugated pipe), is a new type of lightweight pipe with a ring-shaped structured outer wall and a smooth inner wall, belonging to the category of flexible pipes. The following is a detailed introduction to double-wall corrugated pipes:
1. Material Characteristics
Double-wall corrugated pipes are primarily made from high-density polyethylene (HDPE), which offers excellent chemical stability, aging resistance, and resistance to environmental stress cracking. HDPE molecules are non-polar, resulting in outstanding chemical stability, with most chemical media having no damaging effect except for a few strong oxidizing agents.
2. Structural Features
Double-wall structure: Double-wall corrugated pipes feature a unique double-wall structure, with the outer wall having a ring-shaped corrugated pattern that significantly enhances the pipe's ring stiffness, thereby improving its resistance to soil loads. The inner wall remains smooth, reducing water flow resistance and increasing flow capacity.
Wall thickness grades: Double-wall corrugated pipes can be classified into different grades based on wall thickness, such as S1, S2, S3, S4 (enterprise standards), or SN4, SN8 (national standards). Different grades are suitable for various construction scenarios and requirements.
3. Performance Advantages
Lightweight: Double-wall corrugated pipes are lightweight, making them easy to transport and install, thereby reducing construction costs.
Quick installation: Due to their light weight and convenient connection methods, construction speed is greatly accelerated, shortening project timelines.
High pressure resistance: The ring-shaped corrugated outer wall enhances the pipe's compressive strength, allowing it to withstand high pressures.
Good toughness: HDPE material has excellent toughness, making double-wall corrugated pipes resistant to cracking under external impact.
Long lifespan: Under normal usage conditions, the service life of double-wall corrugated pipes can exceed 50 years.
Excellent wear resistance: Tests conducted in Germany have shown that HDPE's wear resistance is even several times higher than that of steel pipes.
Low-temperature impact resistance: The embrittlement temperature of double-wall corrugated pipes is -70°C, meaning no special protective measures are needed during construction under general low-temperature conditions (above -30°C).
4. Application Scope
Double-wall corrugated pipes have a wide range of applications, including:
Municipal engineering: Used in drainage and sewage pipeline systems.
Construction engineering: Employed for building rainwater pipes, underground drainage pipes, sewage pipes, and ventilation pipes.
Electrical and telecommunications engineering: Serves as protective conduits for various power cables.
Railway and highway communications: Used as protective pipes for communication cables and optical fibers.
Industrial fields: Widely used in chemical, medical, and environmental protection industries for sewage discharge pipes.
Agricultural and garden engineering: Utilized for irrigation and drainage in farmlands, orchards, tea plantations, and forest belts.
Road engineering: Functions as drainage pipes for railways and highways.
Mining: Used for mine ventilation, air supply, and drainage pipes.
5. Precautions
Selection and specifications: When choosing double-wall corrugated pipes, appropriate wall thickness grades and specifications should be selected based on specific application scenarios and requirements.
Connection methods: Double-wall corrugated pipes are typically connected using heat fusion butt welding or socket connections, ensuring that joints are well-sealed and leak-free.
Construction and installation: During construction, attention should be paid to protecting and securing the pipes to avoid damage from external forces. Additionally, the installation position should comply with design requirements to ensure proper pipe operation.
In summary, double-wall corrugated pipes are widely applied and recognized in multiple fields due to their unique structure and excellent performance.