300mm HDPE pipe (high-density polyethylene pipe) is a medium-caliber plastic pipe widely used in municipal, industrial, agricultural and other fields. Its standard size parameters are as follows:
Nominal diameter (DN): 300mm
Outer diameter (OD): 300±0.3% mm (in accordance with GB/T 19472.1-2019 standard)
Inner diameter (ID): varies according to wall thickness, usually between 255~280mm
Wall thickness (SDR) and pressure level
|
SDR (Standard Dimension Ratio) |
Wall Thickness (mm) |
Nominal Pressure (PN) |
Applicable Scenarios |
|
SDR17 |
17.6 |
0.6 MPa |
Low-pressure drainage, irrigation |
|
SDR13.6 |
22.1 |
0.8 MPa |
Municipal water supply, industrial pipelines |
|
SDR11 |
27.3 |
1.0 MPa |
High-pressure water transport, chemical medium transport |
Standard length
Single pipe is usually 6m, 9m or 12m, and can also be customized
Coils (small diameter flexible pipes) are not suitable for 300mm specifications
Weight calculation
HDPE density is about 0.95g/cm³, and the theoretical weight of 300mm HDPE pipe can be estimated as:
Weight (kg/m) = (outer diameter - wall thickness) × wall thickness × 0.00314 × density
For example: The weight of 300mm pipe of SDR11 (27.3mm wall thickness) ≈ (300-27.3) × 27.3 × 0.00314 × 0.95 ≈ 22.5kg/m
1. Municipal water supply and drainage system
Water supply engineering
Applicable to urban water supply trunk pipes and community secondary water supply networks
Recommended SDR11 (PN1.0MPa) or SDR13.6 (PN0.8MPa) specifications to ensure pressure bearing capacity
Advantages: Smooth inner wall (roughness coefficient 0.009), water transmission efficiency is 15%~20% higher than cast iron pipes
Drainage engineering
Used for rainwater and sewage discharge, commonly found in buried pipelines under municipal roads
Using SDR17 (PN0.6MPa) can meet non-pressure drainage needs
Strong corrosion resistance, service life of more than 50 years
2. Industrial fluid transportation
Chemical industry
Transport of acid and alkali solutions, salt media (such as HCl, NaOH, etc.)
HDPE materials with UV resistance (ultraviolet) stability should be selected to prevent aging
Mining and power
Slurry transportation: better wear resistance than steel pipes, suitable for media containing solid particles
Cable protection sleeve: 300mm diameter can accommodate multiple high-voltage cables
3. Agricultural irrigation
Drip irrigation/sprinkler main pipeline
300mm pipe is suitable for water supply mains in large farms and water conservancy hubs
Strong weather resistance, can adapt to -40℃~60℃ environment
4. Special application scenarios
Non-excavation construction (jacking/drag pipe)
300mm HDPE pipe has good flexibility and is suitable for directional drilling across rivers and roads
High construction efficiency, saving 30% of construction time compared to concrete pipes
Marine engineering
Used for desalination plant drainage pipes, resistant to salt spray corrosion
Pressure matching
Municipal water supply: select PN0.8MPa or above
Gravity drainage: PN0.6MPa is sufficient
Connection method
Hot-melt connection: suitable for high-pressure systems, requiring a special welder
Electrofusion connection: suitable for construction in narrow spaces
Flange connection: used when connecting with valves and pump station equipment
Buried requirements
Minimum cover depth: ≥1.2m under the roadway, ≥0.8m under the sidewalk
Foundation treatment: Sand cushion thickness ≥100mm
|
Comparison Item |
300mm HDPE Pipe |
300mm Steel Pipe |
300mm Concrete Pipe |
|
Weight |
Light (22 kg/m) |
Heavy (72 kg/m) |
Very Heavy (200 kg/m) |
|
Corrosion Resistance |
Excellent |
Poor (requires anticorrosion treatment) |
Moderate |
|
Construction Speed |
Fast (heat fusion connection) |
Slow (welding) |
Very Slow (socket joint) |
|
Service Life |
50+ years |
20–30 years |
30–50 years |
300mm HDPE pipe has become the preferred pipe material in municipal, industrial, agricultural and other fields due to its standardized size specifications, excellent corrosion resistance and flexible construction methods. When selecting the pipe, it is necessary to comprehensively consider the pressure demand (SDR), medium characteristics (chemical resistance) and construction environment (buried/trenchless) to ensure the economy and reliability of the project.
