Prestressed Corrugated Duct Selection Guide-Comparing Plastic, Metal & Dual-Wall Solutions for Structural Applications
1. Product Types & Core Applications
A. Plastic Corrugated Duct (HDPE/PP)
Material: High-density polyethylene (HDPE) or polypropylene (PP)
Key Features:
Chemical resistance (pH 2–12)
Lightweight (0.9–1.4 g/cm³)
Flexible installation (bending radius ≥30×OD)
Applications:
Electrical conduit (UL 651A)
Drainage systems (ASTM F2648)
B. Prestressed Corrugated Metal Duct (Galvanized Steel)
Material: Galvanized steel (G235) or aluminized steel (AZ150)
Key Features:
High tensile strength (≥500 MPa)
Grout-tight spiral seams (EN 523)
Post-tensioning compatibility (PTI M50.3)
Applications:
Bridge tendon ducts (AASHTO LRFD)
Nuclear containment structures (ACI 349)
C. Dual Wall Pipe (HDPE/Steel Hybrid)
Material: HDPE outer wall + steel reinforcement
Key Features:
Crush resistance (≥50 kN/m²)
UV-stabilized outer layer
Electromagnetic shielding (for utility tunnels)
Applications:
Trenchless installations (ASTM F1962)
Oil/gas secondary containment
2. Selection Criteria Comparison
ParameterPlastic DuctMetal DuctDual Wall Pipe
Max Pressure0.5 MPa2.0 MPa1.6 MPa
Temp Range-40°C to +60°C-30°C to +300°C-30°C to +80°C
Lifespan25–50 years50–75 years40–60 years
Cost (per meter)5–5–1520–20–5030–30–70
3. Installation & Compliance
Plastic Ducts:
Require sand bedding (150mm min.)
Joints: Thermal fusion or couplers (ASTM D3212)
Metal Ducts:
On-site welding/bolting (AWS D1.4)
Grout injection testing (PTI M55.1)
Dual Wall Pipes:
Horizontal directional drilling (HDD) compatible
Leak detection via tracer wires (API RP 1130)
4. Industry Standards Quick Reference
Plastic: ASTM F2160 (HDPE), ISO 9001 (QC)
Metal: EN 523 (ducts), ACI 318 (grouting)
Dual Wall: ASTM F2947 (polyethylene), ASME B31.3 (process piping)
