EN
PE-RT II Pre-Insulated Pipe DN25-315 | 50-Year Secondary District Heating Network
National High-Tech Enterprise. PE-RT II plastic carrier + PU foam + HDPE jacket, DN25–315mm, ≤85°C, 50+ year life. Zero corrosion, hot-melt fusion joints, 50% lighter than steel. GB/T 28799 & CJ/T 480 certified. Request free sample & quote!
- Overview
- Technical Specifications
- Application Scenarios
- Service & Support
- Recommended Products
Overview
Why PE-RT II Is Replacing Steel in Secondary Networks
Globally, pre-insulated pipes reduce thermal losses by 80–90% vs. uninsulated steel. The shift to plastic carrier pipes for secondary heating networks is accelerating: PE-RT II systems are easier to transport, faster to install, offer better insulation performance, and eliminate the #1 failure mode in secondary networks — corrosion. Modern formulations achieve losses below 5% per 100 meters.
◆ Zero Corrosion — 50+ Years of Clean Hot Water. PE-RT II (Polyethylene of Raised Temperature Resistance, Type II) is inherently immune to rust, scaling, and chemical attack. No internal linings to maintain, no water quality degradation, no rust-colored water complaints from residents. Where steel secondary pipes corrode from the inside out within 15–20 years, PE-RT II delivers 50+ years of maintenance-free service.
◆ Hot-Melt Fusion — Leak-Proof Joints in Minutes. Hot-melt butt fusion and electrofusion create monolithic joints that become stronger than the pipe itself. No certified welders, no X-ray inspection, no corrosion protection at joints. Installation speed is dramatically faster than steel welding — reducing both labor cost and project timeline.
◆ 50% Lighter Than Steel — No Heavy Equipment. PE-RT II insulated pipe weighs approximately half of an equivalent steel insulated pipe. For DN25–315mm diameters, no cranes are needed for handling or installation. This makes PE-RT II the practical choice for congested urban sites, building basements, and retrofit projects where access is constrained.
◆ Type II — Engineered for Heat, Not Just Warm Water. PE-RT II is specifically formulated for continuous hot water service at ≤85°C with 95°C peak. Unlike Type I (indoor floor heating only), Type II has higher density, superior high-temperature creep resistance, and excellent low-temperature impact strength to −40°C. The same 0.033 W/(m·K) PU foam insulation matches premium steel insulated pipe thermal performance.
◆ Smooth Inner Wall — No Scaling, Consistent Flow. PE-RT II's inner surface remains smooth throughout its service life — no mineral scaling, no biofilm buildup, no flow rate degradation. This eliminates the periodic descaling maintenance that steel secondary pipes require, further reducing the total cost of ownership over the 50-year design life.
PE-RT II vs. Steel-Core Pre-Insulated Pipe (Secondary Network Comparison)
Feature |
Sanjie PE-RT II |
Steel-Core Insulated |
Corrosion |
Zero — plastic carrier, immune |
Rusts if jacket is breached |
Service Life |
50+ years |
30–50 years |
Weight |
~50% lighter |
Heavy, needs lifting equipment |
Connection |
Hot-melt fusion (minutes) |
Steel welding (hours + X-ray + WPS) |
Inner Scaling |
Smooth — no scaling, no biofilm |
Scales over time, needs descaling |
Water Quality |
Non-toxic, no leaching |
May require internal lining |
Flexibility |
Bends with terrain, fewer fittings |
Rigid, needs elbows |
Installed Cost |
Lower — less equipment, faster joints |
Higher — welding + inspection |
Low-Temp Limit |
−40°C (no embrittlement) |
−50°C |
Temperature Limit |
≤85°C (95°C peak) |
≤120°C (130°C peak) |
Technical Specifications
|
Parameter |
Standard / Value |
|
Carrier Pipe |
PE-RT Type II (Heat-Resistant Polyethylene) |
|
Insulation |
Rigid PU Foam — density ≥60 kg/m³, thermal conductivity ≤0.033 W/(m·K) |
|
Outer Jacket |
HDPE (High-Density Polyethylene) |
|
Diameter Range |
DN25–315mm |
|
Pressure Rating |
PN1.0 / PN1.25 / PN1.6 MPa |
|
Operating Temperature |
≤85°C continuous (95°C peak) |
|
Low-Temp Resistance |
−40°C (no embrittlement) |
|
Service Life |
50+ years |
|
Connection Method |
Hot-melt butt fusion / Electrofusion |
|
Standards |
GB/T 28799 / CJ/T 480 |
|
Certifications |
ISO 9001 / ISO 14001 / CE |
|
Applications |
Secondary heating, domestic hot water, geothermal |
|
Packaging |
End protection + weather-resistant wrapping |
Application Scenarios
Residential Secondary Heating Networks. The ideal "last mile" connecting primary mains to apartment buildings. PE-RT II’s corrosion immunity and hot-melt fusion joints eliminate the maintenance burden that plagues steel secondary pipes. 50+ year life matches building infrastructure horizons.
Multi-Family Domestic Hot Water. Safe, non-toxic PE-RT II carrier ensures clean hot water for residential buildings, hotels, and hospitals. Zero scaling maintains consistent flow rates. No rust means no discolored water complaints.
Geothermal & Hot Spring Water. PE-RT II handles up to 85°C geothermal water continuously. Corrosion-resistant to mineral-rich geothermal fluids. PU insulation minimizes heat loss from wellhead to end-use facilities.
Retrofit & Congested Urban Sites. 50% lighter than steel — easy to route through crowded mechanical rooms, utility tunnels, and building basements. Hot-melt fusion in confined spaces without welding fumes or fire risk.
Suburban Community Heating Loops. Direct-buried PE-RT II pipes connect multiple buildings within residential compounds. HDPE jacket + PU foam provide waterproof, maintenance-free underground service for 50+ years.
Trusted Across 110+ Countries
Our PE-RT II pre-insulated pipes serve district heating operators, residential developers, geothermal energy companies, and municipal governments worldwide. Project references and compliance documentation available on request.
Service & Support
Full-Process Service — Engineering to Lifetime Operation
|
Service Item |
Details |
|
Pre-Sales Consulting |
Secondary network design, heat loss calculation, PE-RT II vs. steel cost comparison, diameter and SDR selection. |
|
Engineering Design |
CAD/PDF drawings with thermal calculations, expansion analysis, and PE-RT II pipe sizing for residential heating networks. |
|
Free Samples |
At no charge. Customer covers freight. Cross-section sample for foam density and bond verification. |
|
Production & QC |
In-house PE-RT II extrusion line. GB/T 28799 and CJ/T 480 tested. Regular progress and QC reports. |
|
Delivery |
7–14 days. EXW, FOB, CIF. Lightweight PE-RT II reduces freight costs vs. steel insulated pipes. |
|
MOQ |
Flexible per project scope. |
|
Technical Support |
Hot-melt fusion and electrofusion training, joint sealing supervision, expansion design consulting. |
|
After-Sales Warranty |
Comprehensive warranty. Dedicated support team for installation, maintenance, and technical inquiries. |
|
Payment Terms |
T/T, L/C at sight. Flexible for long-term partners. |
|
OEM / ODM |
Custom branding, marking, packaging, specification available. |
