As global water resource pressure continues to intensify, building efficient, environmentally friendly and sustainable water infrastructure has become an important task for governments and enterprises. Against this background, high-density polyethylene pipes (HDPE pipes) have gradually become the preferred material for water infrastructure construction with their excellent performance and environmental protection characteristics. They are widely used in urban water supply, drainage, irrigation and industrial water systems, demonstrating huge development potential and broad market prospects.
HDPE (High-Density Polyethylene) pipes are plastic pipes made of high-density polyethylene resin as raw materials and extruded by special processes. Its compact structure and high molecular weight make the pipes extremely tough and corrosion-resistant. Compared with traditional metal pipes and concrete pipes, HDPE pipes perform superiorly in many key performance indicators and are ideal materials for modern water conservancy projects and urban infrastructure construction.
1. Excellent corrosion resistance
HDPE pipes can resist the erosion of various chemical media and will not rust or corrode like metal pipes. The service life is up to 50 years or more, which greatly reduces the frequency of maintenance and replacement and reduces the operation and maintenance costs.
2. Excellent flexibility and impact resistance
HDPE pipes have good flexibility and can adapt to slight settlement and vibration of the ground, reducing the risk of pipe rupture caused by geological deformation. At the same time, its impact resistance makes it less likely to be damaged during installation and transportation, improving construction efficiency.
3. Convenient connection and good sealing performance
Using hot-melt connection or electric-melt connection technology, HDPE pipes can achieve leak-free connection, greatly improving the overall sealing of the system, preventing secondary pollution and water leakage, and ensuring water supply safety.
4. Environmental protection and energy saving
The energy consumption in the production process of HDPE pipes is low, and the materials are recyclable, which is in line with modern environmental protection concepts. The low friction resistance of the pipe can also reduce the energy consumption of water pump operation and improve the efficiency of water resource utilization.
1. Urban water supply system
With the acceleration of urbanization, urban water supply networks require more durable and reliable pipe materials. HDPE pipes are widely used in urban water supply trunk pipes and branch pipes due to their corrosion resistance, long life and safety, ensuring the safety and stable supply of drinking water for residents.
2. Drainage and sewage treatment system
The chemical corrosion resistance of HDPE pipes makes it very suitable for sewage discharge and industrial wastewater transportation. Its good flexibility and sealing ensure the long-term stable operation of the drainage system and reduce the risk of environmental pollution.
3. Agricultural irrigation
In the field of agricultural irrigation, HDPE pipes help achieve efficient water-saving irrigation. It can adapt to various terrains, is easy to install and durable, and provides strong guarantees for agricultural production and water resource protection.
4. Industrial water and mining applications
HDPE pipes are also suitable for complex environments such as industrial cooling water transportation and mining pipelines. With their corrosion resistance and wear resistance, they ensure the continuity and safety of industrial production.
With the increasing awareness of climate change and environmental protection, the construction of green and sustainable water infrastructure has become a trend of future development. The application of HDPE pipes fits this trend:
Reduce water waste: good sealing, corrosion resistance, reduce leakage, and save precious water resources.
Extend the life of infrastructure: the service life is more than 50 years, reduce replacement frequency, and reduce resource consumption.
Promote environmental protection: the material can be recycled, and the impact on the environment during production and use is small.
Reduce operating costs: reduce maintenance and energy consumption, and improve the overall efficiency of the system.
These advantages make HDPE pipes the core supporting technology for the construction of intelligent and green water infrastructure, promoting the modernization and sustainable development of water resource management.
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In municipal engineering, the installation of HDPE (high-density polyethylene) pipes must follow strict specifications to ensure their durability, sealing and safety. The following are key precautions:
Material acceptance
Check the quality certification documents of pipes and fittings (such as certificates of conformity, test reports) to ensure compliance with national standards such as GB/T 19472.2.
Appearance inspection: no cracks, scratches, depressions or bubbles, and the port is flat and burr-free.
Check whether the specifications (such as SDR value, ring stiffness grade) are consistent with the design requirements.
Trench excavation
Trench bottom width: When the pipe diameter is ≤DN500, the trench width is ≥ the outer diameter of the pipe + 0.5m; when the pipe diameter is larger, sufficient operating space must be reserved.
Slope and base: Slope according to design requirements (such as 1:0.33), the base must be flat and free of gravel and hard objects, and the over-excavated part should be backfilled and compacted with sand and soil.
Groundwater level: If groundwater is encountered, it is necessary to take precipitation measures or replace the gravel layer with anti-floating pipes.
Connection method
Hot-melt butt welding (applicable to large-diameter pipes):
Clean the heating plate, control the temperature (200~220℃), and perform the welding pressure and time according to the manufacturer's parameters.
Check the uniformity of the flange after butt welding to avoid false welding.
Electrofusion connection (with socket pipe fittings):
Ensure that the oxide layer is scraped off the pipe end, the insertion depth is clearly marked, and the power-on time/voltage meets the requirements of the pipe fittings.
Mechanical connection (flange or clamp): Check whether the sealing ring is installed in place and the bolts are tightened symmetrically.
Main points for laying
Flexible foundation: Lay a 10~15cm medium-coarse sand cushion layer, and fully support the 120° range below the pipe.
Bending radius: Cold bending is allowed, but the curvature radius ≥ 25 times the pipe diameter (such as DN400 pipe requires R ≥ 10m).
Snake laying: When the temperature changes greatly, reserve 2%~3% of the expansion and contraction to avoid thermal expansion and deformation of the straight line.
Backfill in layers
Backfill on the pipe side: use sand or fine soil with a particle size of ≤10mm, symmetrically compact in layers (each layer ≤20cm), and the compaction degree ≥90%.
50cm above the top of the pipe: direct mechanical rolling is prohibited, and manual compaction is adopted.
Upper backfill: compact in layers according to the requirements of roads or greening to avoid settlement.
Special area treatment
Add steel casing protection when crossing the road, and seal and prevent seepage at both ends of the casing.
Soft soil foundation needs to be replaced or reinforced with gravel piles to prevent uneven settlement of the pipeline.
Testing items
Pressure test: inject water to stabilize the pressure for 1h, and the pressure drop is ≤0.05MPa to be qualified (refer to GB 50268).
Water-tight test: non-pressure pipelines are tested in sections according to the specifications, and the allowable water seepage is ≤Q=0.0046Di (m³/24h·km).
Electrofusion joint inspection: Detect the fusion quality by X-ray or ultrasonic.
Safety measures
Groove support: set baffles or slopes when the depth is ≥1.2m, and set warning lights at night.
Lifting operation: use nylon slings to avoid scratches on pipes, and keep personnel away from the radius of the boom.
Leakage: strictly check the quality of the interface to avoid socket failure or incorrect welding parameters.
Deformation: control the compaction degree during backfilling to avoid overloaded vehicles rolling over inadequate backfill sections.
Through standardized construction and full-process quality control, HDPE pipes can give full play to their advantages of corrosion resistance, good flexibility, and long life (more than 50 years), and are suitable for municipal scenarios such as water supply and drainage, rainwater and sewage pipe networks.
Official website: www.phtopindustry.com | www.phpipes.com
Contact us: Email:inquiry@phtopindustry.com | Whatsapp:+86 15093100892
Company address: Room 802, 8th Floor, Building 5, Jinyin Modern City, Jinshui District, Zhengzhou City, Henan Province, China
HDPE (high-density polyethylene) pipes play a vital role in sponge city construction. Their excellent physical properties, environmental protection characteristics and convenient construction make them the core materials for modern urban drainage, rainwater management and ecological restoration. The following is an analysis of the core role of HDPE pipes in sponge city construction and their advantages:
One of the core goals of sponge cities is to solve the problem of urban waterlogging. HDPE pipes can significantly improve drainage efficiency and reduce the risk of blockage due to their smooth inner wall and low friction coefficient. Compared with traditional concrete pipes, HDPE pipes have stronger water-passing capacity and can deliver larger flows at the same pipe diameter, or use smaller pipe diameters at the same flow rate to reduce project costs.
In addition, HDPE pipes are suitable for rainwater collection and reuse systems, such as:
Permeable pavement and rainwater gardens: HDPE pipes can connect permeable pavements and reservoirs to achieve rapid infiltration and storage of rainwater.
Recycled water reuse system: Some sponge city projects (such as Wuxi, Jiangsu) use HDPE pipes to use treated rainwater for greening irrigation or road washing to reduce water waste.
HDPE pipes have excellent chemical corrosion resistance and can resist the erosion of acids, alkalis, salts and industrial wastewater, and are suitable for complex underground environments. Its service life can reach more than 50 years, which is much longer than traditional concrete pipes and cast iron pipes, reducing the economic and environmental burden caused by frequent replacement.
Sponge city construction often involves soft soil foundations or areas prone to settlement. The high flexibility and impact resistance of HDPE pipes enable them to adapt to uneven settlement, and even maintain structural integrity under extreme conditions such as earthquakes, avoiding leakage problems caused by pipe rupture.
Recyclable: HDPE materials are recyclable and in line with the green and low-carbon development concept of sponge cities.
Reducing secondary pollution: The inner wall of HDPE pipes is smooth, not easy to scale or breed bacteria, avoiding water pollution, and is particularly suitable for drinking water and rainwater recycling systems.
Lightweight design: HDPE pipes are light in weight, easy to transport and install, and reduce construction difficulty and mechanical requirements.
Flexible connection method: hot melt or electric fusion connection is used to ensure the sealing of the interface and reduce the risk of leakage.
Low comprehensive cost: Although the initial investment may be high, the long-term maintenance cost is low, and the overall economic benefits are better than traditional pipes.
The application of HDPE pipes in sponge city construction includes:
Municipal drainage and sewage systems (such as the sponge city pilot in Changde, Hunan).
Industrial wastewater discharge (corrosion resistance makes it suitable for chemical, mining and other fields).
Agricultural irrigation and saline-alkali land improvement (such as fishery water supply and salt brine supply).
Road and tunnel drainage (strong pressure resistance and can withstand vehicle loads).
HDPE pipes have become an indispensable key material in sponge city construction due to their corrosion resistance, high flexibility, environmental protection and ease of construction. It not only improves the efficiency of urban drainage systems, but also supports the resource utilization of rainwater, helping cities achieve the ecological goals of "water absorption, water storage, water infiltration and water purification".
Official website: www.phtopindustry.com | www.phpipes.com
Contact us: Email:inquiry@phtopindustry.com | Whatsapp:+86 15093100892
Company address: Room 802, 8th Floor, Building 5, Jinyin Modern City, Jinshui District, Zhengzhou City, Henan Province, China