Prestressed corrugated duct sizes: technical specifications and selection guide
Download the complete prestressed corrugated duct sizes chart.
1. Prestressed Corrugated Metal Ducts
Standard Sizes & Applications:
- Diameter Range: 50mm to 300mm (post-tensioning tendons)
- Wall Thickness: 0.25mm to 1.0mm (galvanized steel or stainless steel)
- Corrugation Pitch: 15mm to 30mm (spiral or annular designs)
Case Example:
Hong Kong-Zhuhai-Macao Bridge used 120mm prestressed steel ducts with 0.5mm galvanized coating for corrosion resistance in marine environments.
2. Plastic Corrugated Duct (HDPE/PP)
Common Dimensions:
- Internal Diameter: 40mm to 250mm (for grout injection)
- Wall Thickness: 1.5mm to 4.0mm (smooth or ribbed interior)
- Pressure Rating: PN6 to PN16 (for high-pressure grouting)
Key Feature:
Lightweight & chemically inert, ideal for aggressive soil conditions (e.g., wastewater plants).
3. Dual Wall Corrugated Pipe
Structural Specifications:
- Outer Diameter: 100mm to 600mm (for drainage & cable conduits)
- Inner Smooth Layer: 1.0mm to 3.0mm thickness
- Stiffness Class: SN4 to SN16 (kN/m²)
Project Reference:
London Crossrail employed 400mm dual-wall HDPE ducts with SN8 stiffness for underground cable protection.
Selection Criteria for Engineers
- Load Requirements:
- Verify axial & radial strength per EN 524 (Europe) or ASTM F2160 (US)
- Corrosion Resistance:
- Galvanized steel for neutral soils
- HDPE for acidic/alkaline conditions
- Installation Factors:
- Minimum bending radius (≥30× pipe diameter)
- Joint sealing (heat fusion for plastics, threaded couplers for metal)
Comparative Summary
TypeBest ForMax Temp.LifespanMetal DuctHigh-stress post-tensioning150°C50+ yearsPlastic DuctChemical resistance80°C30 yearsDual Wall PipeUnderground utilities60°C50 years
All data complies with ISO 9001, ASTM, and EN standards.