Introduction to Double Wall Corrugated Pipe
I. Definition and Structure
Double wall corrugated pipe is a new type of lightweight pipe primarily made from high-density polyethylene (HDPE) through an extrusion molding process. Its pipe wall consists of two layers:
Smooth inner wall: Reduces fluid resistance and improves transportation efficiency.
Corrugated outer wall: Enhances the ring stiffness of the pipe through corrugation, improving compressive performance.
II. Product Features
Lightweight and high strength: Density is only 1/8 that of steel pipes, making transportation and installation convenient.
Corrugated structure provides high ring stiffness (SN4/SN8/SN12.5 grades), capable of withstanding soil pressure and traffic loads.
Corrosion resistance: Excellent chemical stability, resistant to acid, alkali, and salt corrosion, suitable for buried drainage and sewage engineering.
Flexibility: Minimum bending radius can reach 20-25 times the pipe diameter, adapting to complex terrain.
Convenient construction: Various connection methods (socket-type, hot melt butt fusion, electrofusion band connection), ensuring high construction efficiency.
Economical: Long service life (designed for over 50 years), with low maintenance costs.
III. Application Fields
Municipal engineering: Municipal drainage and sewage pipeline systems
Cable protection pipes
Construction engineering: Building rainwater pipes, underground drainage pipes
Ventilation pipes
Agricultural engineering: Farmland irrigation and drainage systems
Industrial fields: Liquid transportation in chemical, pharmaceutical, and other industries
IV. Purchasing Suggestions
Select specifications based on engineering requirements: Burial depth ≤1.5m: SN4 grade
Burial depth 1.5-4m: SN8 grade
Burial depth >4m: SN12.5 grade
Focus on raw material quality: Prefer 100% new HDPE raw materials to avoid performance issues from recycled materials.
Check manufacturer qualifications: Ensure products pass ISO9001 quality system certification and comply with national standards.
V. Precautions
Transportation and storage: Avoid direct sunlight; storage temperature ≤40°C
Stacking height should not exceed 3m to prevent deformation.
Construction key points: Trench foundation must be compacted to avoid uneven settlement.
Joints require sealing treatment to prevent leakage.
Acceptance standards: Ring stiffness, impact strength, and oven tests must meet GB/T 19472.1-2019 requirements.
VI. Market Trends
Green and environmentally friendly: Aligns with the national "replace steel with plastic" policy, reducing carbon emissions.
Technological innovation: Development of high-performance HDPE alloy materials to enhance pipe performance.
Application expansion: Widely used in sponge city construction, utility tunnels, and other fields.