Union Pipes Industry
HDPE Double Wall Corrugated Piping System
High-performance gravity piping for drainage, sewerage, stormwater and underground infrastructure, engineered for strength, hydraulic efficiency and long service life.
Built for buried infrastructure
UPI double wall corrugated pipes combine a structured outer wall with a smooth internal bore. The profile delivers high ring stiffness with low weight, while the smooth interior supports efficient gravity flow and reduces sediment build-up.
High ring stiffness
Available in SN4, SN6 and SN8 classes for demanding underground installations.
Smooth hydraulic bore
Low internal friction supports efficient flow and reliable drainage performance.
Durable HDPE
Excellent resistance to corrosion, chemicals, abrasion and aggressive soil conditions.
Double wall. One integrated structure.
Corrugated outer wall: provides structural strength and resistance to soil and traffic loads.
Smooth inner wall: improves hydraulic performance and supports easier cleaning and inspection.
Integrated HDPE construction: combines flexibility, impact resistance and low installation weight.
Performance advantages
Ring flexibility
Accommodates ground movement and installation loads without brittle failure.
Corrosion resistance
Unaffected by rust and suitable for aggressive wastewater and soil environments.
Abrasion resistance
Supports reliable transport of water containing suspended solids.
Low weight
Reduces handling effort, equipment requirements and installation time.
Sealed joints
Push-fit connections with elastomeric seals support watertight performance.
Integrated system
Pipes, couplers, bends, tees, reducers and end caps form a complete solution.
Applications
- Underground sewerage networks
- Stormwater drainage and outfalls
- Highway and road culverts
- Subsurface and agricultural drainage
- Industrial drainage systems
- Telecommunication cable protection
Product range
Material and standard
Material: High Density Polyethylene (HDPE)
Standard: EN 13476-3, Type B
Ring stiffness: SN4, SN6 and SN8
Supply lengths
Straight lengths are available in 6 m and 12 m. Selected smaller diameters can also be supplied in 100 m coils.
Availability depends on diameter, stiffness class and project requirements.
| Nominal size | Outside diameter (mm) | Minimum ID (mm) | Standard supply |
|---|---|---|---|
| DN 100 | 115 ± 1 | ≥ 95 | 6 m / 12 m / 100 m |
| DN 150 | 169.0 – 173.0 | ≥ 145 | 6 m / 12 m / 100 m |
| DN 200 | 228.5 – 233.5 | ≥ 195 | 6 m / 12 m |
| DN 250 | 286.0 – 292.0 | ≥ 245 | 6 m / 12 m |
| DN 400 | 458.5 – 465.5 | ≥ 392 | 6 m / 12 m |
| DN 500 | 572.5 – 581.5 | ≥ 490 | 6 m / 12 m |
| DN 600 | 687.5 – 696.5 | ≥ 588 | 6 m / 12 m |
The table lists the standard sizes presented in the catalogue. Additional sizes and project-specific configurations are available on request.
Fittings and accessories
UPI provides a coordinated range of components for changes in direction, branches, transitions and terminations.
Couplers and end caps
Corrugated couplers for pipe connections and end caps for secure termination.
Tees and reducers
Equal tees, reducer tees and Y-tees for branches and size transitions.
Corrugated bends
Factory-made bends for controlled changes in pipeline direction.
Push-fit jointing
Inspect
Check pipe ends, sockets and seals for damage.
Clean
Remove dirt, sand and moisture from all joint surfaces.
Fit the seal
Install the elastomeric sealing ring in the specified corrugation.
Lubricate
Apply approved lubricant evenly to the seal and socket.
Align and insert
Keep the pipes aligned and push the spigot fully into the coupler.
Verify
Confirm insertion depth, alignment and seal position.
Quality testing and standards
Raw material tests
Melt flow rate (ISO 1133), density (ISO 1183), carbon black content (ISO 6964) and oxidation induction time (ISO 11357-6).
Product performance
Dimensions (EN 13476-3), ring stiffness (ISO 9969), ring flexibility (ISO 13968) and resistance to heating (ISO 12091).
Controlled production
Documented inspection and testing support consistent dimensions, stiffness and jointing performance.
Handling and storage
Safe handling
Lift with suitable slings and protect pipe ends. Do not drag, drop or roll pipes over sharp surfaces.
Correct storage
Store on level supports, protect from impact and stack in accordance with diameter and site safety requirements.
Correct bedding, backfilling and compaction are essential to the long-term structural performance of buried flexible pipelines.
Need a project-specific drainage solution?
Contact Union Pipes Industry for diameter selection, ring stiffness guidance, fittings and technical support.