---
title: "Resources — What is a DWC Pipe?"
canonical: https://www.alompoly.com/resources
source: ALOM Poly Extrusions Limited
---
# What is a DWC Pipe?

A DWC (Double Wall Corrugated) pipe is a structured-wall HDPE piping system with two co-extruded walls fused into one section:

- A **smooth inner wall** that delivers low hydraulic friction (Manning's n ≈ 0.009).
- A **corrugated outer wall** that provides ring stiffness, crush resistance and bending flexibility.

The combination gives the hydraulics of a smooth pipe with the structural stiffness of a thick-walled pipe at roughly one-eighth the weight of equivalent RCC. DWC HDPE is the dominant modern choice for buried gravity-flow sewerage, drainage and cable ducting up to 1000 mm.

## Frequently asked questions

**Q: Are DWC pipes better than RCC?**
For gravity-flow sewerage and drainage, yes — lighter, faster to install, leak-tight, corrosion-immune, and 75–100 year service life vs ~30 for RCC.

**Q: Which Indian standards govern DWC?**
IS 16098 (Part 2) for sewerage and drainage. IS 16205 (Part 24): 2018 for cable ducting.

**Q: What sizes does ALOM manufacture?**
50 mm to 1000 mm internal diameter, in stiffness classes SN4 and SN8.

**Q: Can DWC handle deep burial and heavy traffic?**
Yes — use SN8 class with proper sand/granular bedding and compacted backfill. Suitable for Class A traffic loading and deep cover.