1. Standard size system
Outer diameter: accurate to 90.0±0.3mm (in accordance with ISO 4427 tolerance standard)
Wall thickness series:
PN6: 5.4mm (SDR17)
PN8: 7.3mm (SDR11)
PN10: 8.2mm (SDR9)
PN12.5: 10.1mm (SDR7.4)
Pressure bearing capacity: can withstand up to 1.6MPa working pressure (PN16 specification)
{C}2. {C}Physical property data
|
Parameter |
Typical Value |
Test Standard |
|
Weight per Meter |
2.1–4.3 kg |
GB/T 8806 |
|
Inner Diameter |
79.6–69.8 mm |
According to pressure rating |
|
Ring Stiffness |
SN8–SN16 |
ISO 9969 |
|
Minimum Bending Radius |
15D (1.35 m) |
EN 12201 |
1. Municipal engineering field
Rainwater collection system:
When the 90mm pipe is used as a branch pipe, it can carry a drainage volume of 50L/s (under a slope of 3%), which is suitable for the series connection of rainwater grates on both sides of urban roads. A sponge city project in Beijing uses a 90mm pipe with a ring stiffness of SN8, which reduces the cost per kilometer by 23%.
Water supply branch pipe network:
The 90mm pipe with PN10 specification meets the branch water supply needs of 2,000 households at a pressure of 0.8MPa. Compared with DN80 metal pipes, hydraulic losses are reduced by 18%.
2. Agricultural irrigation system
Drip irrigation main pipeline:
When the working pressure is 0.6MPa, a single 90mm pipe can support 60 drip irrigation branches (spacing 8m), and the irrigation area reaches 30 mu. Actual measurements at a farm in Xinjiang show that the water utilization rate has increased from 55% to 85%.
Mobile sprinkler system:
When used with quick connectors, the 90mm pipe can withstand the crushing of agricultural machinery and has an impact resistance of 20kJ/m² (ASTM D2444 standard).
3. Special industrial applications
Mining slurry transportation:
Using a wear-resistant formula 90mm pipe (wall thickness ≥9.1mm), when the slurry concentration is ≤40%, the wear rate is <0.1mm/thousand tons.
Chemical medium transmission:
Acid-resistant 90mm pipe (with anti-UV agent added) has an annual corrosion amount of <0.01mm in the pH range of 2-11.
1. Comparison of connection solutions
|
Connection Method |
Application Scenario |
Technical Notes |
|
Butt Fusion |
Permanent buried pipelines |
Maintain 20 mm melt allowance |
|
Electrofusion Coupler |
Emergency repair / confined spaces |
Voltage 39.5 ± 0.5 V, heating time 90 s |
|
Flange Connection |
Equipment interfaces |
Use PN16-grade stainless steel flanges |
2. Pipe trench design specifications
Underground laying:
30cm below the frozen soil layer, pipe bottom width = pipe diameter + 300mm (i.e. 390mm)
Overhead laying:
Spacing between brackets is 1.8m (reduced to 1.5m when the medium temperature is 40℃)
3. Hydraulic calculation example
Requirements for a water supply system in a farm:
Flow rate: 12m³/h
Pipeline length: 500m
Height difference: 8m
Calculation results of using 90mm PN10 pipe:
Flow rate: 0.68m/s (＜economic flow rate 1m/s)
Head loss: 4.2m (calculated by Darcy formula)
Terminal pressure: 3.8m (meets the requirement of 2.5m for drinking fountains)
Pressure requirement:
＜0.6MPa → PN6
0.6-1.0MPa → PN10
＞1.0MPa → PN12.5
Burial depth selection:
Under the road → SN10 or above
Green belt → SN8
Medium temperature:
＞40℃, 0.5MPa pressure margin needs to be increased
Sewage renovation project in an industrial park:
Using 90mm SDR11 HDPE pipe 1820 meters
Compared with traditional concrete pipes:
|
Metric |
HDPE Pipe |
Concrete Pipe |
|
Installation Efficiency |
85 m/day |
35 m/day |
|
Joint Leakage Rate |
0 |
3 locations/km |
|
Total Cost |
¥218/m |
¥275/m |
Solar hot water transportation:
When the black 90mm tube is used as a heat collecting tube, the water temperature rises by 1.2℃/m tube length when the radiation amount is 800W/m².
Cable protection sleeve:
When 6 Φ25mm cables are inserted inside, the friction coefficient is only 0.08 (much lower than 0.15 of PVC pipe).
This article systematically presents the key points of the size application of 90mm HDPE pipe in different scenarios through specific data tables, calculation formulas and comparative cases.
