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Help CenterPolyurethane Foam Pre-insulated Pipe HDPE Jacket Direct Buried Underground Pipe for District Heating and Chilled Water
Product Spotlights
HDPE outer casing, waterproof, anti-corrosion, good mechanical strength for underground buried installation
Pre-fabricated in factory, easy and fast on-site welding, shorten construction period
Comply with EN253 standard, stable performance for long service life up to 30 years
Custom diameter DN25-DN1200, adjustable length & thickness as project requirements
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Product Description
Pre-insulated polyurethane pipe (HDPE black jacket pipe) is a three-in-one integrated pipeline system, composed of working steel pipe, rigid polyurethane foam insulation layer and HDPE outer casing.
The inner steel pipe adopts seamless or spiral welded steel pipe (20#, Q235B, Q355B). The steel pipe outer surface is shot blasted to Sa2.5 grade before foaming, removing rust, oil and scale, forming uniform anchor pattern to strengthen bonding force. The inner wall of HDPE outer casing is treated by corona discharge to improve surface tension, so that PU foam can tightly adhere to HDPE jacket, avoiding delamination.
The rigid PUR foam has low thermal conductivity, high closed-cell rate and excellent thermal insulation performance. The HDPE outer jacket provides waterproof, moisture-proof and anti-corrosion protection, the whole pipe can be directly buried underground without extra trench protection.
Key Advantages
Low heat loss, energy saving, thermal conductivity ≤0.033 W/(m·K)
Integrated factory prefabrication, fast site installation, shorten construction period
Good waterproof & anti-corrosion performance, service life up to 30-50 years
Stable structure, foam tightly bonded with steel pipe and HDPE jacket, no separation
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Meet GB/T 29047-2021, also available for EN253 standard upon request
Technical Specifications
| Item | Parameter |
|---|---|
| Working steel pipe | 20#, Q235B, Q355B, seamless / spiral welded steel pipe |
| Insulation layer | Rigid polyurethane foam (CFC-free) |
| Foam Density | ≥60 kg/m³ |
| Closed-cell rate | ≥88% |
| Working Temperature | -40℃ ~ 120℃ (peak 130℃) |
| Outer Casing | HDPE high density polyethylene |
| Surface Treatment | Steel pipe shot blasting Sa2.5; HDPE inner wall corona treatment |
| Standard | GB/T 29047-2021, optional EN253 |
| Connection | Welded |
Application
District heating network, urban central heating, chilled water pipeline, geothermal system, industrial hot water & medium transportation.
Our Service
Custom diameter, wall thickness and foam thickness. Provide 3.1 material certificate, SGS test report, COA. Support bulk stock & customized production.
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