1 Introduction
The composite of various layers is conducted in a molten state of plastic; this is completely different from the secondary melting and forming of winding pipes (hollow wall pipes), allowing for complete adhesion between layers and very high strength.
The steel belt surface undergoes special pretreatment to enhance the corrosion resistance of the steel and the bonding strength between steel and plastic, improving the peel strength. The winding forming is done when the plastic raw materials are fully melted, making the overall structure of the pipe firm and reliable. The use of special materials and processes not only addresses the corrosion issue of the steel plate but also enhances the adhesion with PE materials, ensuring that the service life of the pipeline is comparable to that of pure plastic pipes, guaranteed to exceed 50 years.
Connections can be made using electric heat fusion, heat shrink tape, internal and external extrusion welding, or a combination of various connection methods, ensuring a firm connection. Reliable connections can achieve zero leakage in the pipeline.
2 Pipe Characteristics
1. Chemical Resistance: Not contaminated or corroded by wastewater and chemicals, and not corroded by decaying materials in the soil;
2. Impact Resistance: The pipe wall adopts a 'U' shaped structure, making it impact-resistant and pressure-resistant, without cracking even under foundation settlement, and having strong recovery ability after deformation, demonstrating good adaptability to the foundation;
3. Aging Resistance: The pipe is typically black and can withstand direct sunlight during storage and construction;
4. Cold Resistance: The pipe will not crack or expand to leak in environments as low as -60℃;
5. Lightweight: Easy to transport and convenient for construction, weighing only 1/8 of cement pipes, requiring only an excavator for burial, without the need for large equipment;
6. Convenient Connections: The pipes can be connected outside the trench and pushed into the trench with an excavator, reducing project time and costs;
7. Superior Wear Resistance: More wear-resistant than steel and cement pipes, with strong capacity for transporting domestic wastewater and debris;
8. Excellent Drainage Flow: Smooth interior reduces friction, allowing for fast drainage;
9. Economic Efficiency: Low construction, management, and maintenance costs;
10. Environmental Impact: HDPE is a non-toxic material, harmless to soil and the environment, and can be recycled.
11. Good Stability of Pipeline System: The round external rib structure of the pipe not only increases the ring stiffness but also provides root resistance, solving problems caused by longitudinal displacement of the pipeline.
12. Completely Reliable Ring Stiffness: Due to the elastic modulus ratio of the two materials (steel and plastic) being greater than 200 and the weight ratio being greater than 7.85, the steel belt reinforcement easily provides sufficient safety and reliability in ring stiffness and a relatively high stiffness-to-weight ratio compared to pure plastic pipes.
3 Application Fields
Municipal Engineering: Underground drainage and sewage pipes;
Road Engineering: Drainage pipes for railways and highways;
Industry: Widely used for industrial wastewater pipes;
Construction Engineering: Rainwater pipes, underground drainage pipes, sewage pipes, ventilation pipes, etc. for buildings;
Landfill leachate collection pipes;
Large Port and Dock Projects: Drainage and sewage pipes for large airports, ports, and docks;
Sports Venues: Drainage pipes for golf courses, football fields, and other sports venues;
Water Conservancy Projects: Source pipes, irrigation pipes, and use in hydropower station water supply and drainage;
Mines: Ventilation, air supply, drainage, and slurry pipes in mines;
Communication Pipes: Communication for railways and highways, and protective pipes for communication cables and optical fibers;
Water Storage Systems: Water storage systems that intercept slow water flows;
Agricultural Engineering: Drainage and irrigation for farmland, orchards, tea gardens, and forest belts;
Seawater Conveyance Pipes.
