In modern urban construction, a stable, efficient, and low-loss water pipeline system is fundamental to city operations. Whether it's municipal water supply, industrial water delivery, or urban secondary water supply systems, the rational selection of water pipes and network solutions directly impacts system lifespan, operating costs, and water supply security.
This page provides a complete guide to selecting water pipeline solutions from the perspectives of pipe material selection, pipe diameter design, pressure rating, and application standards in different countries, helping you quickly determine the optimal solution.
Small Municipal Projects / Community Water Supply
Pipe Material: PVC / uPVC pipes
Main Pipe: DN90–DN160
Branch Pipe: DN63–DN110
Pressure: PN6–PN10
Medium-Sized City Water Supply Systems
Pipe Material: HDPE + PVC combination
Main Pipe: DN160–DN315
Branch Pipe: DN90–DN160
Pressure: PN10
Large City / Municipal Main Network
Pipe Material: HDPE pipe for water supply (preferred)
Main Pipe: DN315–DN800+
Branch Pipe: DN110–DN315
Pressure: PN10–PN16
A complete urban water supply system includes:
Water source (surface water/groundwater)
Water treatment plant
Transmission pipeline
Distribution network
Secondary supply
Among these, the water pipeline system is the most crucial component of the entire system.
1. HDPE Water Pipes (Recommended for Main Pipes and Water Transmission)
Suitable for:
Long-distance water transmission
Municipal main water supply networks
Complex foundation areas
Advantages:
Leak-free (thermal fusion connection)
Earthquake and settlement resistant
Service life over 50 years
Corrosion resistant (suitable for complex water qualities)
Conclusion: HDPE is the preferred choice for municipal main water supply networks.
2. PVC/uPVC Water Pipes (Recommended for Distribution Pipes)
Suitable for:
Urban water distribution systems
Low and medium pressure water supply
Advantages:
Low cost
Smooth inner wall, high water flow efficiency
Easy installation
Conclusion: PVC is the preferred choice for urban branch pipes.
3. Ductile Iron Pipes
Suitable for:
Ultra-high pressure systems
Old urban area renovation
Advantages:
High strength
Strong pressure resistance
Disadvantages:
Prone to corrosion
High construction costs
Conclusion: Used for special high-pressure or government projects.
{C}1. {C}Transmission Pipeline
|
City Size |
Recommended Pipe Diameter |
Pressure Rating |
|
Small Cities |
DN160–315 |
PN10 |
|
Medium Cities |
DN315–630 |
PN10–PN16 |
|
Large Cities |
DN630–1200 |
PN16 |
Design Principles:
The longer the water transmission distance, the larger the pipe diameter.
The greater the flow rate, the greater the required DN ≥ 400.
Urban trunk network: Must have a high safety factor.
{C}2. {C}Distribution Pipes
|
Area / Zone |
Recommended Pipe Diameter |
Pressure Rating |
|
Main Roads |
DN160–315 |
PN10 |
|
Secondary Roads |
DN110–200 |
PN8–PN10 |
|
Residential Areas |
DN63–110 |
PN6–PN8 |
{C}3. {C}Service Pipes (In-home and Terminal Pipelines)
|
Type |
Size Range |
|
Service Connection Pipes |
DN20–DN63 |
|
Building Water Supply |
DN25–DN90 |
1. Southeast Asia (Philippines / Indonesia / Vietnam)
Characteristics:
Cost-sensitive
Rapid urban expansion
Commonly used:
PVC + HDPE combination
Main trunk: DN160–400
Pressure: PN8–PN10
Key point: Cost-effectiveness priority
2. Middle East / Africa
Characteristics:
High temperature
Scarce water resources
Commonly used:
HDPE water pipeline
Main trunk: DN315–800
Pressure: PN10–PN16
Key point: High temperature resistance + long service life
3. South America (Brazil / Chile / Peru)
Characteristics:
Large-scale municipal projects
Commonly used:
HDPE + DI pipes
Main trunk: DN400–800
Pressure: PN10
Key point: High flow rate water delivery
4. Europe / Australia
Characteristics:
Strict standards
High environmental protection requirements
Commonly used:
High-grade HDPE
Main trunk: DN160–630 Pressure: PN12.5–PN16
Key Points: High Standards + Long Cycle
Scheme 1: Urban Main Water Transmission
Pipe Material: HDPE
Pipe Diameter: DN400–800
Pressure: PN10–PN16
Usage: Water Plant → Urban Main Network
Scheme 2: Urban Water Distribution System
Pipe Material: PVC / HDPE
Pipe Diameter: DN110–315
Pressure: PN8–PN10
Usage: Urban Distribution
Scheme 3: Community Water Supply System
Pipe Material: PVC
Pipe Diameter: DN63–110
Pressure: PN6–PN8
Usage: Residential Areas
1. Is it for main water supply or distribution?
Main supply → HDPE
Distribution → PVC
2. Is the flow rate large?
Large → DN315 and above
Small → DN110 and below
3. Is it a long-term project?
Yes → HDPE
No → PVC
Full range of HDPE water pipes / PVC pipes / pipe fittings
Support for complete water pipeline design
Extensive experience in municipal projects
Stable supply capacity
High-performance, cost-effective solutions
Q1: Why are HDPE pipes recommended for urban water supply?
Because they are leak-proof, corrosion-resistant, and have a long lifespan, making them suitable for long-term municipal projects.
Q2: Can PVC pipes be used for municipal trunk lines?
Generally not recommended; they are suitable for medium and low-pressure water distribution systems.
Q3: How to choose the pipe diameter?
Based on a comprehensive calculation of the water supply population, flow rate, and water transmission distance, large projects typically require DN315 or larger.
Q4: What is the lifespan of water supply pipes?
HDPE can last for over 50 years, while PVC lasts approximately 20–30 years.
