HDPE double—wall corrugated pipe is a plastic pipe manufactured by extrusion molding with HDPE as the main raw material. It features a smooth inner wall, an arc-shaped corrugated outer wall, and a hollow structure between the inner and outer corrugations.
It is suitable for buried drainage and communication sheathing with a long-term service temperature not exceeding 45℃, and can also be used for industrial drainage and sewage pipes.
1. Implementation Standard
Polyethylene (PE) Structured Wall Pipe Systems for Buried Applications — Part 1: Polyethylene Double-Wall Corrugated Pipes
2. Performance Features
High ring stiffness: The corrugated structure delivers high strength, excellent rigidity and flexibility, as well as good compression and impact resistance.
Low flow resistance: The smooth inner wall reduces fluid friction and improves flow capacity.
Good sealing performance: Connected with elastic sealing rings for easy installation and leak-free joints.
Convenient construction: Light weight for easy transportation and good anti-settling performance.
Long service life: Corrosion-resistant to acids, alkalis and other chemical media, with high wear resistance.
Low overall cost: Light weight eliminates the need for cranes, shortens construction period and reduces total project cost.
3. Product Dimensions
Nominal ring stiffness class
Grade | SN2 | SN4 | (SN6.3) | SN8 | (SN10) | SN12.5 | SN16 |
Ring stiffness/(kN/m2) | 2 | 4 | (6.3) | 8 | (10) | 12.5 | 16 |
Note: The values in parentheses are non-preferred grades. |
Pipe dimensions for the internal diameter series
Unit：mm
Nominal inner diameter
DN/ID | Minimum average internal diameter
dim, min | Minimum lamination wall thickness
e min | Minimum inner layer wall thickness
e1, min |
Minimum outer layer wall thickness
e3, min
| Minimum joint length
A min |
100 | 95 | 1.0 | 0.8 | 0.7 | 32 |
125 | 120 | 1.2 | 1.0 | 0.8 | 38 |
150 | 145 | 1.3 | 1.0 | 0.8 | 43 |
200 | 195 | 1.5 | 1.1 | 0.9 | 54 |
225 | 220 | 1.7 | 1.4 | 0.9 | 55 |
250 | 245 | 1.8 | 1.5 | 1.0 | 59 |
300 | 294 | 2.0 | 1.7 | 1.0 | 64 |
400 | 392 | 2.5 | 2.3 | 1.4 | 74 |
500 | 490 | 3.0 | 3.0 | 1.8 | 85 |
600 | 588 | 3.5 | 3.5 | 2.1 | 96 |
800 | 785 | 4.5 | 4.5 | 2.7 | 118 |
1000 | 985 | 5.0 | 5.0 | 3.0 | 140 |
1200 | 1185 | 5.0 | 5.0 | 3.0 | 162 |
四、Performance Index
Physical and mechanical properties of the pipe
Item | Specification | Test method |
Ring stiffness/(kN/m2) | SN2a SN4
SN6.3a
SN8
SN10a
SN12.5
SN16 | ≥2 ≥4
≥6.3
≥8
≥10
≥12.5
≥16 | GB/T9647—2015 |
Impact resistance(TIR)/% | ≤10 | GB/T14152—2001 |
Ring flexibility |
The pipe shall be free of cracks, no separation between the two walls, and no reverse bending of the inner wall | ISO 13968:2008 |
Oven test | No delamination, no cracking | GB/T19472.1-2019；8.7 |
Density/(kg/m3 ) | ≤1180 | GB/T1033.1—2008 |
Oxidation induction time(200 ℃ )/min | ≥20 | GB/T19466.6—2009 |
Creep ratio | ≤4 | GB/T18042—2000 |
a Not a preferred grade |
V. Application Fields
Municipal engineering and rural sewage disposal projects: Used as drainage and sewage pipes;
Construction engineering: Used as rainwater pipes, underground drainage pipes, sewage pipes and ventilation pipes for buildings;
Communication equipment: Used as protective pipes for communication cables and optical cables;
Agricultural garden engineering: Used for drainage in farmland, fruit tea gardens and forest belts;
Road engineering: Used as seepage and drainage pipes for railways and expressways;
Mines: Used as ventilation, air supply and drainage pipes in mines.
