Union Pipes Industry
Pre-Insulated HDPE Piping System
Reliable factory-insulated piping for district cooling, heating, chilled water and demanding industrial applications.
Engineered for thermal performance
UPI pre-insulated pipes maintain the temperature of the transported fluid while reducing energy loss. The system is manufactured under controlled factory conditions to deliver thermal integrity, durability and reliable operation throughout its service life. Pipes and fittings are manufactured in accordance with EN 253:2009.
Thermal efficiency
Minimizes heat loss and maintains fluid temperature for efficient operation.
High durability
Designed for long service life in demanding operating and environmental conditions.
Quality assured
Factory controlled manufacturing and testing to meet project and international requirements.
Three-layer pipe structure
1. HDPE inner pipe
PE100 service pipe carries the fluid and provides chemical resistance, flexibility and leak-free performance.
2. PU foam insulation
High-density rigid polyurethane foam limits heat transfer and supports long-term thermal efficiency.
3. HDPE outer jacket
Protects the insulation against moisture, UV exposure, mechanical impact and external conditions.
Applications
- District cooling systems
- Domestic hot and cold water systems
- District heating systems
- Gas, steam, fuel and lubricant transportation
- Oil and gas applications
- Temperature-dependent industrial processes
Carrier pipe specifications
HDPE PE100 carrier pipe
Material: High Density Polyethylene PE100 for pressure applications.
Standard: ISO 4427-2
Size range: 20 mm to 1200 mm
Available SDR: SDR 17, SDR 11, SDR 9 and SDR 7.4
System advantages
High mechanical strength, excellent hydraulic performance, corrosion resistance, long service life and compatibility with butt fusion and electrofusion jointing.
Pre-insulated fittings
Factory-manufactured PE100 HDPE fittings are designed to match the piping system and are compatible with butt fusion and electrofusion. Available options include:
Elbows
15°, 22.5°, 30°, 45°, 60° and 90° angles.
Branches & reducers
Equal tees, reducing tees, concentric and eccentric reducers.
System accessories
Flange adaptors, end caps and special fittings manufactured on request.
Fittings are insulated with PU foam, pressure tested before insulation, protected with a high-performance PE finish and sealed against moisture ingress.
Rigid polyurethane insulation
High-pressure injection
Rigid closed-cell PU foam is injected under pressure to fill the space between the HDPE carrier pipe and outer jacket in one continuous operation.
- Low heat loss
- Moisture resistance
- High mechanical strength
- Dimensional stability
- Long service life
| Property | Value |
|---|---|
| Thermal conductivity (λ) | ≤ 0.033 W/m·K |
| Density | 40–80 kg/m³ |
| Compressive strength (10% deformation) | ≥ 0.30 MPa |
| Shear strength | ≥ 0.26 MPa |
| Flammability | DIN 4102 B3 |
| Toxicity | Non-toxic |
HDPE outer jacket dimensions
| Outer diameter (mm) | Wall thickness (mm) | Tolerance | Length |
|---|---|---|---|
| 125 | 2.5 | ± 1 mm | Up to 12 m |
| 140 | 3.0 | ± 1 mm | Up to 12 m |
| 160 | 3.0 | ± 1 mm | Up to 12 m |
| 180 | 3.0 | ± 1 mm | Up to 12 m |
| 200 | 3.2 | ± 1 mm | Up to 12 m |
| 225 | 3.5 | ± 1 mm | Up to 12 m |
| 250 | 3.9 | ± 1 mm | Up to 12 m |
| 280 | 4.4 | ± 1 mm | Up to 12 m |
| 355 | 5.6 | ± 1 mm | Up to 12 m |
| 400 | 6.3 | ± 1 mm | Up to 12 m |
| 450 | 7.0 | ± 1 mm | Up to 12 m |
| 500 | 7.8 | ± 1 mm | Up to 12 m |
| 560 | 8.8 | ± 1 mm | Up to 12 m |
| 630 | 9.8 | ± 1 mm | Up to 12 m |
| 800 | 12.5 | ± 1 mm | Up to 12 m |
Sizes up to 1600 mm with different specifications are available upon request. Insulation thickness is selected according to project conditions and thermal calculations.
Jointing, protection and handling
Reliable joint protection
Designed to provide watertight protection, insulation continuity, mechanical protection and long-term system performance.
Storage and transportation
Use flat-bed vehicles and even supports free from sharp edges. Do not drop, drag or roll pipes on the ground, throw them from vehicles, use metal chains or store them near sharp objects.
Quality, certifications & approvals
HDPE pipes and fittings for pressure applications.
Approved materials under the Water Regulations Advisory Scheme.
Approved manufacturer (PMT) and approved supplier to the National Water Company.
Need a project-specific solution?
Contact Union Pipes Industry for technical support, sizing, insulation selection and on-site fusion services.