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ISO 21138
Spiral structured-wall pipe
Non-pressure gravity pipe, selected by nominal size (DN/ID) and ring-stiffness class (SN)— not SDR. PEXMART manufactures 200–1800 mm ID with integral socket & spigot.
DN500 · SN8
ISO 21138
Inside Ø (nominal)
500mm
Ring stiffness
8kN/m²
Typical use: Roads, deeper cover, traffic loading.
Mass per metre & exact wall build are per PEXMART’s spiral profile — request from PEXMART.
Applications
Gravity trunk sewer mainsStorm-water & sub-soil drainageSewer rising mainsCulverts & road crossingsCorrosion-resistant tanks & manholes
Ring-stiffness classes
| Class | kN/m² | Typical use |
|---|---|---|
| SN2 | 2 | Shallow, low-load ground |
| SN4 | 4 | General gravity drainage |
| SN8 | 8 | Roads, deeper cover, traffic loading |
| SN16 | 16 | Deep burial / heavy loading |
SN12.5 also available on request.
ISO 21138 — Structured-wall piping systems for non-pressure underground drainage & sewerage (PE). Structured-wall pipe is non-pressure — the solid-wall SDR/mass calculator does not apply. Confirm exact size/SN availability and mass with PEXMART.