Large-diameter double-wall corrugated pipe, steel strip reinforced corrugated pipe for drainage and sewage pipelines.

Double-wall corrugated pipe, fully named 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. Below is a detailed introduction to the double-wall corrugated pipe:
1. Material Characteristics
Double-wall corrugated pipe uses high-density polyethylene (HDPE) as the main raw material. This material offers excellent chemical stability, aging resistance, and resistance to environmental stress cracking. HDPE molecules are non-polar, resulting in outstanding chemical stability. Except for a few strong oxidizing agents, most chemical media do not cause damage to it.
2. Structural Features
Double-wall structure: The double-wall corrugated pipe features a unique double-wall structure. The outer wall has a ring-shaped corrugated structure, significantly enhancing the pipe's ring stiffness and thus 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 lightweight nature and convenient connection methods, construction speed is significantly increased, shortening the project timeline.
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 the double-wall corrugated pipe resistant to cracking under external impact.
Long service life: 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 the wear resistance of HDPE 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. Under general low-temperature conditions (above -30°C), no special protective measures are required during construction.
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 as rainwater pipes, underground drainage pipes, sewage pipes, and ventilation pipes in buildings.
Electrical and telecommunication engineering: Serves as protective piping for various power cables.
Railway and highway communication: Used as protective piping 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: Used as drainage pipes for railways and highways.
Mining: Serves as ventilation, air supply, and drainage pipes in mines.
5. Precautions
Selection and specifications: When selecting double-wall corrugated pipes, appropriate wall thickness grades and specifications should be chosen based on specific application scenarios and requirements.
Connection methods: The connection of double-wall corrugated pipes typically uses heat fusion butt welding or socket and spigot connections. It is essential to ensure that the joints are well-sealed and leak-free.
Construction and installation: During construction, attention should be paid to the protection and fixation of the pipes to avoid damage from external forces. Additionally, the installation position of the pipes should comply with design requirements to ensure proper operation.
In summary, double-wall corrugated pipes have gained widespread application and recognition in multiple fields due to their unique structure and excellent performance.