HDPE Double Wall Corrugated Drainage Pipe System
Product Overview
In addition to the characteristics of ordinary plastic pipes such as corrosion resistance, high insulation, smooth inner wall, and low flow resistance, HDPE double wall corrugated pipes also adopt a special hollow annular structure, featuring excellent ring stiffness, good strength and toughness, light weight, strong impact resistance, and resistance to damage.
Currently widely used in many fields in developed countries, especially in the United States, Canada, Japan, and many European countries. Double wall corrugated pipes are extensively applied in municipal drainage and sewage, agricultural irrigation, coal mine ventilation, communication cable protection, and other fields. Practice has proven that while meeting the strength and stiffness requirements for engineering applications, the double wall corrugated structure can save 30%-50% of materials. Compared with concrete pipes and cast iron pipes, it offers advantages such as convenient transportation and installation, reduced labor intensity for construction workers, and lower total project investment, making it an ideal substitute for concrete and cast iron pipes.
Product Advantages
① Unique structure, high external pressure resistance, impact resistance, with ring flexibility, smooth inner wall with low friction, pipes of the same internal diameter can achieve larger flow capacity; socket joints, flexible connection, convenient and reliable connection, not easy to leak | ② Light weight, fast construction, reduced costs |
③ Buried service life exceeds 50 years | ④ Polyethylene is a hydrocarbon polymer with non-polar molecules, resistant to acid and alkali corrosion |
⑤ Raw materials are green and environmentally friendly, non-toxic, non-corrosive, non-scaling, recyclable | ⑥ Wide applicable temperature range, pipes do not crack at -60°C, maximum temperature for conveyed medium is 60°C |
⑦ Comprehensive engineering cost is basically equivalent to concrete, low operating cost | ⑧ No foundation required in good soil conditions |
Nine Key Product Features
HDPE double wall corrugated pipes have excellent chemical stability, aging resistance, and resistance to environmental stress cracking. HDPE double wall corrugated pipes produced from this raw material are flexible pipes. Their performance is as follows:
Strong External Pressure Resistance
The outer wall has a ring-shaped corrugated structure, greatly enhancing the pipe's ring stiffness, thereby increasing the pipe's resistance to soil loads. In this aspect, HDPE double wall corrugated pipes have obvious advantages compared with other pipes.
Low Engineering Cost
Under equal load conditions, HDPE double wall corrugated pipes only require thinner pipe walls to meet requirements. Therefore, compared with solid wall pipes of the same material and specifications, approximately half of the raw materials can be saved, making HDPE double wall corrugated pipes more cost-effective. This is another outstanding feature of this pipe material.
Convenient Construction
Due to the light weight of HDPE double wall corrugated pipes, handling and connection are very convenient, making construction fast and maintenance simple. Under tight schedules and poor construction conditions, its advantages are even more obvious.
Low Friction Coefficient, Large Flow Capacity
HDPE double wall corrugated pipes made from HDPE material can achieve greater flow capacity than other pipes of the same diameter. In other words, under the same flow requirements, HDPE double wall corrugated pipes with relatively smaller diameters can be used.
Good Low Temperature Resistance, Impact Resistance
The brittle temperature of HDPE double wall corrugated pipes is -70°C. Under general low temperature conditions (above -30°C), special protective measures are not required during construction, making winter construction convenient. HDPE double wall corrugated pipes have good impact resistance.
Excellent Chemical Stability
Since HDPE molecules have no polarity, chemical stability is excellent. Except for a few strong oxidants, most chemical media do not cause damage. Generally, soil, electricity, acid, and alkali factors in the usage environment will not damage the pipe, prevent bacteria growth, prevent scaling, and the flow area will not decrease with operating time.
Long Service Life
Under conditions without sunlight and ultraviolet radiation, the service life of HDPE double wall corrugated pipes can exceed 50 years.
Excellent Wear Resistance
German tests have proven that HDPE wear resistance is even several times higher than steel pipes.
Appropriate Flexibility
A certain length of HDPE double wall corrugated pipe can be slightly bent axially, unaffected by a certain degree of uneven ground settlement, and can be directly laid in slightly non-straight trenches without fittings.
Rigorous Production Management
Product Advantages
Select high-quality raw materials to ensure all pipe performance meets requirements
| 1. Control density and MFI: ensure mechanical and processing properties of raw materials |
| 2. Control elongation at break: ensure product toughness, improve ring flexibility |
| 3. Control elastic modulus and tensile strength: ensure pipe ring stiffness |
| 4. Control OIT to ensure pipe weather resistance |
Advanced Manufacturing Process
Digital Full Line Centralized Control |
Full Vacuum Belt Feeding |
Dual Machine Co-extrusion, Double Layer Diversion |
Random Expansion, One-time Forming |
Superior Physical Properties
Physical Properties
| Item | Technical Index | |
|---|---|---|
| Ring Stiffness (kN/m²) | SN4 | ≥ 4 |
| SN8 | ≥ 8 | |
| Impact Resistance (TIR), % | ≤ 10 | |
| Ring Flexibility | Sample smooth, no reverse bending, no rupture, no delamination between walls | |
| Oven Test | No bubbles, no delamination, no cracking | |
| Creep Ratio | ≤ 4 | |
Note: For other performance indicators, please refer to relevant standards.
HDPE Double Wall Corrugated Drainage Pipe System
1. Municipal drainage and sewage pipeline system engineering;
2. Apartment and residential community underground drainage and sewage;
3. Highway pre-buried pipelines, golf course underground water seepage pipe network;
4. Farmland water conservancy irrigation water conveyance, drainage and other water conservancy projects;
5. Chemical and mining industry for fluid transportation and ventilation;
6. Underground pipeline protection casings and communication cable protection casings.
Performance Comparison: HDPE Double Wall Corrugated Pipe vs. Concrete Pipe
| Performance | HDPE Double Wall Corrugated Pipe | Concrete Pipe |
|---|---|---|
| Material Nature | Flexible Pipe | Rigid Pipe |
| Structural Characteristics | Can deform and move under load without structural damage | Deformation under load is extremely small |
| Connection Method | Elastic sealing ring | Flat mouth, socket connection |
| Water Tightness | Good connection sealing, no pipe leakage, groundwater cannot enter | Poor sealing, joints prone to leakage, causing secondary pollution |
| Construction Features | Good flexibility, low foundation requirements; construction not limited by season or temperature; good pipe bendability; lightweight, easy construction | High rigidity, high foundation requirements; bending parts difficult to handle; not easy to transition with other pipes; heavy weight, more auxiliary equipment needed |
| Site Management | Light weight, high safety, low damage risk during handling. Simple closed water test operation, low loss. | Poor safety, easily damaged, complex construction management. Complex closed water test operation, high material and labor costs. |
| Usage Features | High safety after burial; can be repaired by welding, simple and convenient operation. | Low safety after burial; pipe repair requires complete replacement, large workload. |
| Service Life | Up to 50 years | About 20 years |
Product Specifications
| Inner Diameter Series | |||||
|---|---|---|---|---|---|
| DN/ID | Average Inner Diameter dim | Inner Wall Thickness e1 | Layer Wall Thickness e | Minimum Socket Wall Thickness | Length / Piece (m) |
| 225 | 220 | 1.4 | 1.7 | 5.8 | 6 |
| 300 | 294 | 1.7 | 2.0 | 6.8 | 6 |
| 400 | 392 | 2.3 | 2.5 | 9.1 | 6 |
| 500 | 490 | 3.0 | 3.0 | 11.4 | 6 |
| 600 | 588 | 3.5 | 3.5 | 11.4 | 6 |
| 800 | 785 | 4.5 | 4.5 | 11.4 | 6 |
Transportation and Connection Methods
HDPE double wall corrugated pipes can be transported by various means of transportation. During transportation and loading/unloading, throwing, impact, heavy pressure, prolonged exposure to sunlight, or proximity to heat sources are not allowed. Mixing with toxic or harmful substances is prohibited. Coiled multi-hole pipes in disc shape cannot be transported flat. The connection technology for HDPE double wall corrugated pipes has gradually matured through continuous use, and its heat fusion connection includes the following three methods:
1. Electrofusion Connection
Electrofusion connection is generally used at locations constrained
by installation conditions where heat fusion connection cannot be
performed. When connecting the same thermoplastic pipes, insert the
special electrofusion fitting, and the electrofusion machine energizes
the fitting. The pre-embedded resistance wire inside the fitting
generates the required heat for fusion. After cooling, the pipe and
fitting become an integrated whole. Electrofusion connection features
convenient and fast operation, good joint quality, and minimal external
interference.
2. Socket Heat Fusion Connection
Socket heat fusion connection can also be performed with a sleeve
added at the socket position. The pipe insertion end and socket end are
heated and softened respectively, then quickly inserted. After cooling, a
stable and solid heat fusion effect is achieved.
3. Direct Heat Fusion Connection
Heat the pipe and fitting connection parts directly, and perform heat fusion connection directly.
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