Corrugated Steel Pipe (CSP) is the infrastructure standard for drainage systems in Canada and the US due to its ability to withstand severe climate conditions. Unlike rigid concrete pipe, CSP interacts with the surrounding soil to transfer live and dead loads uniformly around its circumference.
Why use Corrugated Pipe?
Corrugated pipe can perform where rigid pipe fails. Its flexibility allows it to tolerate shifting soil and imperfect foundations without cracking.
Rugged Durability
Breakage is rarely a problem. CSP survives rough handling on construction sites and extreme freeze-thaw cycles.
Cost Effective
Lower material costs, lighter freight weight, and significantly easier installation than heavy concrete alternatives.
Versatile
Used for everything from driveway culverts and bridge replacements to underground stormwater detention systems.
ASTM A760 Specifications
The manufacturing of corrugated metallic-coated steel pipe is governed by ASTM A760 / A760M. To ensure longevity underground, the steel sheet, inserts, and coupling bands must be formed from specially coated sheet metal.
- Zinc-Coated (Galvanized): The traditional and most common standard coating.
- Aluminum-Coated (Aluminized Type 2): Offers superior corrosion resistance (75-year design life).
- Zinc-Aluminum-Mischmetal Alloy: Enhanced barrier protection for specific soil profiles.
- Polymer / Aramid Fiber Composite: Heavy-duty laminates used for highly acidic or abrasive environments.
Manufacturing Process
The pipe is fabricated in a full circular cross-section with either Annular (parallel rings) or Helical (continuous spiral) corrugations.
Seams & Welds
Helical seams are lock-seamed or welded. Annular seams are spot welded or riveted to develop the full strength of the pipe without affecting the internal diameter.
Couplings & Hardware
Rivets, nuts, and bolts used in band assemblies are thoroughly sherardized or hot-dip galvanized to perfectly match the protective coating of the pipe body.
Standard DOT Sizes
Most distributors stock the standard "DOT" profile, though larger diameters (up to 144") and heavier gauges are readily available upon request for bridge replacements and large tunnels.
| Diameter Range | Standard Corrugation | Standard Gauge |
|---|---|---|
| 12" to 48" | 2-⅔" x ½" | 16 Gauge |
Buying or Selling Surplus?
Many infrastructure projects end with extra culvert pipe. Whether you are looking to buy discount CSP or sell your surplus inventory, we can connect you with the right partners.
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