I Product Introduction
HDPE pipes are manufactured from high-density polyethylene resin through an extrusion process, representing a new type of plastic pipe that combines rigidity with flexibility. With high molecular weight and excellent mechanical properties, these pipes offer an operating pressure range of 0.32–2.0 MPa and a service temperature range of –60°C to 60°C. Using electrofusion jointing technology, the joint strength exceeds that of the pipe body. Thanks to their outstanding corrosion resistance, impact resistance, and long service life, HDPE pipes are widely used in municipal water supply and drainage, gas transmission, industrial wastewater treatment, and nuclear power circulating cooling water systems, making them an ideal replacement for traditional metal pipes.
I Product Features
● Reliable connection, zero leakage: The electrofusion jointing method produces joints stronger than the pipe body, achieving monolithic integration of pipes and fittings. Flexible joints effectively resist soil settlement and seismic wave impacts, ensuring long-term safe operation of the pipeline network.
● Excellent corrosion resistance: Superior resistance to acids, alkalis, salts, and other chemical media; immune to electrochemical corrosion. In corrosive soils such as marshes and saline-alkali land, no coating protection is required for direct burial.
● Flexible, impact-resistant, and highly adaptable: Elongation at break ≥350%, allowing bending along terrain to reduce the number of fittings. Outstanding low-temperature impact resistance, maintaining good toughness even at –40°C. High scratch resistance minimizes damage during construction.
● Smooth inner wall, high flow capacity: Manning coefficient as low as 0.009, with flow rates more than 30% higher than traditional materials for the same pipe diameter. Non-scaling and resistant to bacterial growth, maintaining high flow capacity over the long term.
● Long service life, maintenance-free: Oxidation induction time ≥20 minutes (at 200°C), with excellent creep resistance. Under buried conditions, the service life can exceed 60 years, offering significant overall economic benefits.
I Technical Data
Project | Condition(PE100) | Requirement | |||||||||||||
Oxidation induction time | 200℃ | ≥20 | |||||||||||||
MFR | 195°℃, 5kg | Before and after processing:MRF<20% | |||||||||||||
20℃ Hydrostatic strength(100h) | 12.4Mpa hoop stress | No rupture, no leakage | |||||||||||||
80℃ Hydrostatic strength(165h) | 5.4Mpa hoop stress | No rupture, noleakage | |||||||||||||
80℃ Hydrostatic strength(1000h) | 5.0Mpa hoop stress | No rupture, no leakage | |||||||||||||
Impact strength | 0℃, 2m, 25kg | No rupture, no leakage | |||||||||||||
I Product Specification
Nominal | The | Wall Thickness(e,mm) | |||||
Standard Size Ratio | |||||||
SDR26 | SDR21 | SDR17 | SDR13.6 | SDR11 | |||
Nominal Pressure(MPa) | |||||||
0.6 | 0.8 | 1.0 | 1.25 | 1.6 | |||
20 | +0.3 | -- | -- | -- | -- | 2.3 | |
25 | +0.3 | -- | -- | -- | -- | 2.3 | |
32 | +0.3 | -- | -- | -- | -- | 3.0 | |
40 | +0.4 | -- | -- | -- | -- | 3.7 | |
50 | +0.5 | -- | -- | -- | 3.7 | 4.6 | |
63 | +0.6 | -- | -- | -- | 4.7 | 5.8 | |
75 | +0.8 | -- | -- | 4.5 | 5.6 | 6.8 | |
90 | +1.0 | -- | 4.3 | 5.4 | 6.7 | 8.2 | |
110 | +1.1 | 4.2 | 5.3 | 6.6 | 8.1 | 10.0 | |
125 | +1.3 | 4.8 | 6.0 | 7.4 | 9.2 | 11.4 | |
140 | +1.4 | 5.4 | 6.7 | 8.3 | 10.3 | 12.7 | |
160 | +1.5 | 6.2 | 7.7 | 9.5 | 11.8 | 14.6 | |
180 | +1.7 | 6.9 | 8.6 | 10.7 | 13.3 | 16.4 | |
200 | +1.8 | 7.7 | 9.6 | 11.9 | 14.7 | 18.2 | |
Nominal | The | Wall Thickness(e,mm) | ||||
Standard Size Ratio | ||||||
SDR26 | SDR21 | SDR17 | SDR13.6 | SDR11 | ||
Nominal Pressure(MPa) | ||||||
0.6 | 0.8 | 1.0 | 1.25 | 1.6 | ||
225 | +2.1 | 8.6 | 10.8 | 13.4 | 16.6 | 20.5 |
250 | +2.3 | 9.6 | 11.9 | 14.8 | 18.4 | 22.7 |
280 | +2.6 | 10.7 | 13.4 | 16.6 | 20.6 | 25.4- |
315 | +2.9 | 12.1 | 15.0 | 18.7 | 23.2 | 28.6 |
355 | +3.2 | 13.6 | 16.9 | 21.1 | 26.1 | 32.2 |
400 | +3.6 | 15.3 | 19.1 | 23.7 | 29.4 | 36.3 |
450 | +4.1 | 17.2 | 21.5 | 26.7 | 33.1 | 40.9 |
500 | +4.5 | 19.1 | 23.9 | 29.7 | 36.8 | 45.4 |
560 | +5.0 | 21.4 | 26.7 | 33.2 | 41.2 | 50.8 |
630 | +5.7 | 24.1 | 30.0 | 37.4 | 46.3 | 57.2 |
710 | +6.4 | 27.2 | 33.9- | 42.1 | 52.2 | 一 |
800 | +7.2 | 30.6 | 38.1 | 47.4 | 58.8 | -- |
900 | +8.1 | 34.4 | 42.9 | 53.3 | -- | -- |
1000 | +9.2 | 47.7 | 59.3 | -- | -- | |
I Application
● Municipal water supply networks: Used for urban water supply mains and distribution networks – no rust or scaling, ensuring safe drinking water quality.
● Gas transmission systems: Specially designed for buried gas pipelines – excellent stress crack resistance and scratch resistance ensure safe gas transmission.
● Municipal drainage and sewage systems: Used for stormwater and sewage networks – high ring stiffness and strong external pressure resistance.
● Industrial piping systems: Suitable for conveying corrosive industrial wastewater in chemical, electroplating, and metallurgical industries.
● Agricultural irrigation networks: Used for farmland irrigation and drip irrigation systems – can be bent along terrain, reducing the number of fittings.
● Slurry transport: Excellent wear resistance – suitable for tailings transport and coal preparation plant pipelines.
● Communication conduit pipes: Used for protecting communication cables and fiber optic cables.
● Water conservancy projects: Suitable for reservoir culverts, water diversion projects, and nuclear power circulating cooling water systems.
I FAQ
1. What is the service life of HDPE pipes?
Under normal buried service conditions, the design service life of HDPE pipes can reach more than 50 years. They exhibit excellent creep resistance, an oxidation induction time of ≥20 minutes, outstanding resistance to environmental stress cracking, and stable long-term performance.
2. What pressure ratings are available for HDPE pipes?
HDPE pipes are available in pressure ratings from PN3.2 to PN20, corresponding to SDR41 to SDR9. Common applications include PN10–PN16 for water supply, PN4–PN8 for gas transmission, and non-pressure or low-pressure gravity flow for drainage systems.
3. What jointing methods are used for HDPE pipes, and how is leak-proof performance ensured?
There are three main jointing methods: electrofusion jointing (for small diameters and fittings), butt fusion jointing (for large-diameter straight pipes), and socket fusion jointing. Electrofusion jointing integrates the pipe and fitting into a monolithic structure, with joint strength exceeding that of the pipe body, achieving zero leakage.
4. Can HDPE pipes be used for hot water transmission?
The long-term service temperature for HDPE pipes should not exceed 40°C. For hot water transmission, pressure derating is required based on the specific temperature. For applications above 40°C, heat-resistant polyethylene (PE-RT) pipes should be used.
5. How to select the ring stiffness class for HDPE pipes?
The ring stiffness class should be selected based on burial depth and ground loading:
● SN4: Suitable for burial depths ≤4 meters in non-heavy-load areas.
● SN8: Suitable for conventional municipal roads with burial depths of 4–8 meters.
● SN12.5 / SN16: Suitable for deep burial, heavy traffic loads, or areas with a high groundwater table.
