Double Flat-Wall Plastic-Steel Spiral Wound Pipe

ID300-3000mm | SN8-SN16

Double Flat-Wall Plastic-Steel Spiral Wound Pipe represents advanced composite technology for large-diameter cable protection applications, combining the best properties of plastic and steel materials. ## Composite Structure ### Double Flat-Wall Design - **Inner Wall**: Smooth HDPE surface for cable pulling - **Outer Wall**: Flat profile for stable bedding - **Core Structure**: Steel-reinforced spiral for ring stiffness ### Material Combination - **HDPE Jacket**: Provides corrosion resistance and chemical protection - **Steel Reinforcement**: Galvanized steel strip for structural strength - **Spiral Winding**: Continuous reinforcement pattern for consistent performance ## Large Diameter Capability Unique manufacturing process enables: - **Maximum Diameter**: ID3000mm - **Minimum Diameter**: ID300mm - **Custom Sizes**: Available on request ## Ring Stiffness Grades Multiple options for varying depth and load conditions: | Grade | Typical Burial Depth | |-------|---------------------| | SN8 | 2-4m standard traffic | | SN10 | 4-6m heavy traffic | | SN12.5| 6-8m special loads | | SN16 | >8m critical applications | ## Application Advantages ### Cable Protection - Protects power and communication cables - Suitable for high-voltage applications - Multi-cable capacity in single conduit ### Utility Tunnels - Large bore accommodates multiple services - Walk-through access for maintenance - Long-term structural integrity ## Connection Methods ### Hot Air Welding Standard method for on-site joint construction, creating watertight seals. ### Electrofusion Precision jointing for critical applications with consistent quality control. ## Quality Assurance Manufactured to CJ/T 270 standard with: - Ring stiffness testing - Weld integrity verification - Dimensional inspection - Material certification