HDPE Drainage Pipe
Double-wall corrugated and solid-wall HDPE for gravity sewer, storm drainage and soakaway. Smooth bore, ribbed outside, SN4 and SN8 ring stiffness.
Tell us the size and quantity — price, lead time and loading plan back in one working day
Dial in the pressure class first, then the diameter. If you are unsure, send the working pressure and we will recommend the SDR.
SN class is set by cover depth, not by diameter
SN4 and SN8 are ring stiffness in kN/m². The governing input is the soil load above the pipe, so the same diameter can need SN4 in a garden and SN8 under a road.
| Size | Typical class | Where it is used |
|---|---|---|
| DN110 | SN4 | Garden / landscape drainage, 0.8–2.0 m cover |
| DN160 | SN4 | Driveway edge, 1.0–2.5 m |
| DN200 | SN8 | Road crossing, 1.2–4.0 m |
| DN300 | SN8 | Road crossing, 1.2–5.0 m |
| DN400 | SN8 | Trunk sewer, 1.5–6.0 m |
| DN500 | SN8 | Trunk sewer, 1.5–6.0 m |
| DN630 | SN8 | Trunk sewer, 2.0–6.0 m |
| DN800 | SN8 | Trunk sewer / outfall, 2.0–6.0 m |
Cover depths are indicative for normal backfill. Final class depends on traffic loading, bedding and soil type — confirm with your engineer or send us the section drawing and we return the class.
Two structures, two jobs
Double-wall corrugated gives stiffness with little weight — the usual choice for storm drainage and sewer. Solid-wall is used where the line is above ground, exposed, or where a smooth heavy-duty bore is needed.
Installation points that decide the result
- Bedding: compacted sand or gravel layer, no hard spots under the pipe
- Backfill in layers, both sides equally, no large stones against the ribs
- Rubber-ring joints kept clean; check the ring seat before pushing home
- Perforated pipe: geotextile wrap to stop fines washing in
Send cover depth and traffic class
Tell us the run length, the number of junctions and whether the line is perforated.
Questions on this product
SN4 or SN8 — how do I choose?
It follows the load above the pipe: garden and landscape drainage usually SN4, road crossings and trunk sewer SN8. Send the cover depth and traffic class and we confirm.
Is the bore smooth?
Yes — double-wall means a smooth inner wall with a corrugated outer wall, so flow capacity is close to a solid-wall pipe of the same ID.
Do you supply perforated pipe?
Yes, perforated for soakaway and field drainage, with geotextile wrap if you need it.
What is the MOQ?
[To confirm — corrugated pipe is bulky, so container utilisation matters more than tonnage.]