HDPE Dual Wall Corrugated Pipe
Co-Extruded Twin-Wall Polyethylene Drainage Pipes — DN 150mm to DN 1000mm — SN4 & SN8 Ring Stiffness — 50+ Year Service Life
Our HDPE dual wall corrugated pipes feature a smooth inner wall for maximum hydraulic efficiency (Manning's n = 0.009) and a rigid corrugated outer profile for outstanding ring stiffness. Available in SN4 and SN8 classes per ASTM F2648 and PNS/ISO 21138 standards.
Manufactured from Virgin PE100 HDPE — zero recycled content — each pipe is designed for 50+ years of maintenance-free underground service, fully resistant to corrosion, root intrusion, and chemical attack.
Key Features & Technical Advantages
Smooth Inner Wall
Manning's n=0.009 — 30% more flow vs. concrete pipe of same diameter. Higher capacity, smaller pipe size, lower project cost.
SN4 & SN8 Stiffness
SN8 for heavy traffic and deep bury. SN4 for general drainage. Both exceed ASTM F2648 ring stiffness requirements.
Chemical Resistance
HDPE is inert to sewage, acids (pH 1.5–14), industrial effluents, and chlorinated water. No sulfide corrosion, ever.
Leak-Proof Gasket Joint
Push-fit rubber ring coupling rated to 0.5 bar. No mortar, no welding, no special tools. Fast field assembly.
80% Lighter than Concrete
A 6m DN300mm section weighs under 20kg. Two workers, no machinery for most sizes — dramatically faster installation.
DPWH / ASTM Compliant
PNS/ISO 21138, ASTM F2648, DPWH spec. Backed by SMS mill certificates and FDC BRS-accredited lab test reports.
Technical Specifications & Size Chart
Pipe Size & Ring Stiffness Matrix
| Nominal ID | OD (approx.) | Ring Stiffness | Std. Length |
|---|---|---|---|
| DN 150mm | 162mm | SN4 / SN8 | 6.0 m |
| DN 200mm | 222mm | SN4 / SN8 | 6.0 m |
| DN 300mm | 325mm | SN4 / SN8 | 6.0 m |
| DN 400mm | 429mm | SN4 / SN8 | 6.0 m |
| DN 500mm | 535mm | SN4 / SN8 | 6.0 m |
| DN 600mm | 640mm | SN4 / SN8 | 6.0 m |
| DN 800mm | 855mm | SN4 | 6.0 m |
| DN 1000mm | 1065mm | SN4 | 6.0 m |
Material & Performance Properties
| Property | Value / Standard |
|---|---|
| Base Material | HDPE PE100 (Virgin) |
| Tensile Strength at Yield | ≥ 18 MPa (ASTM D-638) |
| Elongation at Break | ≥ 350% (ASTM D-638) |
| Flexural Modulus | ≥ 276 MPa (ASTM D-790) |
| Ring Stiffness Test | ASTM F2648 / ISO 9969 |
| Joint Type | Push-fit rubber ring gasket |
| Manning's Coefficient | n = 0.009 |
| Operating Temp. | -40°C to +60°C |
| Service Life | 50+ years underground |
Co-Extrusion Manufacturing Process
Each pipe is produced on a continuous corrugation machine using two extruders working simultaneously. One stream forms the smooth inner liner wall; the other forms the corrugated outer profile. Both layers fuse at the die head under heat and pressure, creating a single monolithic pipe — no adhesive layer, no delamination risk. The corrugation vacuum mold shapes the outer wall to achieve the precise pitch and depth required for SN4 or SN8 ring stiffness targets.
ASTM D2321 Trench Installation Requirements
Because HDPE pipe is flexible, it relies on compacted embedment material for structural support. Trench installation must follow ASTM D2321 and DPWH specifications:
- Bedding: 150mm compacted Class I (crushed stone) or Class II (gravel/coarse sand) below pipe invert
- Haunching: Fill under pipe haunches with no voids — critical for uniform load distribution
- Pipe zone: Class I or II material compacted to ≥90% Standard Proctor density in 150mm lifts up to 300mm above pipe crown
- Initial backfill: Class I, II, or III material from 300mm above pipe to 600mm, compacted to ≥90% Proctor
Applications
- Municipal stormwater drainage and flood control systems
- Subdivision sewerage mains and house connection laterals
- Road and highway culverts (DPWH-compliant)
- Agricultural field drainage and irrigation systems
- Industrial effluent discharge lines
For larger diameters (DN600–DN3000mm), see our Carat Structured Wall HDPE Pipe. For interior finishing, explore our uPVC Ceiling Panels. All products come with full certification documentation.
Need Bulk Pricing or DPWH Documentation?
Contact 5Dragon Construction Corp. for quotations, delivery scheduling, and compliance certificate packages for government projects.
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