HDPE Dual Wall Corrugated Pipe
Co-extruded twin-wall high-density polyethylene pipes. Combining a smooth interior bore with a corrugated structural exterior. The industry standard for sewerage, storm drainage, and culverts.
The Standard for Infrastructure Drainage
HDPE Dual Wall corrugated pipes feature a co-extruded smooth inner liner for maximum hydraulic flow and a corrugated structural profile outer wall to handle external earth and traffic loads.
Manufactured from 100% Virgin PE100 HDPE, these pipes deliver a service life exceeding 50 years under harsh environmental and chemical conditions in the Philippines, fully complying with ASTM F2648 and PNS/ISO 21138 standards.
Available Diameters
DN 150 mm – DN 2000 mm
Ring Stiffness
SN 4 & SN 8 Classes
Standard Length
6.0 Meters (Effective Length)
Joint Systems
Push-fit Rubber Ring Gasket Joint
Benefits and Features
80% Lighter than Concrete
Dramatically reduces transport, handling, and machine-rental costs. A 6m DN300mm section weighs under 20kg, enabling quick manual installation.
Excellent Corrosion Resistance
100% inert to municipal sewage, aggressive soil chemistry, and chemicals (pH 1.5 to 14). Immune to sulfide-acid attack.
High Flow Capacity
Extremely smooth inner liner (Manning's n = 0.009) offers up to 30% higher flow capacities than concrete, reducing required pipe sizing.
For Multiple Uses
Tank Application
Provides a safe, non-toxic, chemical-resistant reservoir structure for water storage or industrial leachate containment.
Culverts
Perfect for under-road culverts, highway crossings, and municipal storm paths with structural SN8 rating.
Drainage Systems
Provides robust municipal, airport, commercial, and agricultural storm runoff drainage collection lines.
Penstock Pipelines
Engineered for run-of-river mini-hydro operations, providing smooth flows, robust joints, and high durability.
Sewerage Systems
Leak-proof push-fit gasket systems prevent municipal waste outflow and root infiltration, protecting localized groundwater.
Landfill
Inert to landfill leachate and acidic gases, ensuring durable drainage layers and gas vents under high trash heaps.
Load Bearing vs Non-Load Bearing
Non-Load Bearing (NLB - SN4)
Designed primarily for general landscape and storm drainage with light earth loads where traffic loads are not present.
Load Bearing (LB - SN8)
Engineered to handle earth loads, permanent surcharge pressures, and live loads, including the extreme stress from DPWH heavy highway vehicle traffic.
Sizes and Dimensions
Complete structural diameters, corrugation pitch specifications, and standard length profiles for project planning.
| Size Class | DN / ID (mm) | DN / OD (mm) | Pitch (mm) |
|---|---|---|---|
| 150 mm | 150 mm | 167 mm | 17.5 mm |
| 200 mm | 217 mm | 224 mm | 17.5 mm |
| 250 mm | 247 mm | 287 mm | 27.0 mm |
| 300 mm | 297 mm | 333 mm | 27.0 mm |
| 400 mm | 396 mm | 442 mm | 30.0 mm |
| 500 mm | 495 mm | 556 mm | 47.5 mm |
| 600 mm | 594 mm | 650 mm | 34.5 mm |
| 700 mm | 693 mm | 739 mm | 46.3 mm |
| 800 mm | 792 mm | 868 mm | 46.3 mm |
| 900 mm | 891 mm | 958 mm | 47.5 mm |
| 1000 mm | 990 mm | 1092 mm | 52.3 mm |
| 1200 mm | 1188 mm | 1235 mm | 59.1 mm |
| 1300 mm | 1287 mm | 1353 mm | 65.9 mm |
| 1400 mm | 1386 mm | 1452 mm | 65.9 mm |
| 1500 mm | 1485 mm | 1563 mm | 87.5 mm |
| 1600 mm | 1584 mm | 1672 mm | 87.5 mm |
| 1800 mm | 1782 mm | 1867 mm | 87.5 mm |
| 2000 mm | 1980 mm | 2062 mm | 87.5 mm |
Standard Pipe Length & Socket
Standard HDPE structured wall pipes are designed with integral socket and spigot connections, offering quick installation and leak-proof jointing. Custom lengths are available upon request.
Wall Thickness & Corrugation Pitch
The structured wall configuration features a smooth inner flow-line and a hollow corrugated exterior profile, providing maximum ring stiffness with minimal weight.
Manufacturing Process
Each pipe is produced on a continuous corrugation line 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 high heat and pressure, creating a single monolithic pipe with zero delamination risk.
ASTM D2321 Trench Installation
Because HDPE pipe is flexible, it relies on compacted embedment material for structural support. Trench installation must follow ASTM D2321 and DPWH specifications.
Embedment Placement Rules
- 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.
| Description | Soil Classification (ASTM D2321) | Min. Compaction Required (Std. Proctor Density %) |
|---|---|---|
| Graded or crushed stone Crushed Gravel | Class I | Dumped |
| Well-graded sand, gravels, and gravelsand mixtures: Poorly graded sand, gravels, and gravel/sand mixtures; Little or no fines | Class II (GW, GP, SW, SP) | 85% |
| Silty or clayey gravels, Gravels/sand/silt or gravels and clay mix-tures: Silty or clayey sands, sand/clay or sand/silt mixtures | Class III (GM, GC, SM, SC) | 80% - 90% |
Ready to upgrade your piping infrastructure?
Contact 5Dragon Construction Corp. today for pricing, technical datasheets, and availability.