MDOT Reference for Corrugated Steel Pipe
(Minimum wall thickness in millimeters to meet structural and durability
requirements for various metal pipe to meet the design life.)
| Use | Driveway Culverts and Downspouts, (Class 6) |
Culverts (Class 1-4) |
Sewers (Class 1-4) | |
| Pipe Material Type | Minimum Design Life: | 25 years | 50 years | 70 years |
| Galvanized Corrugated Steel Pipe | Table 909-7 | Table 909-9 | 4.27(1) | |
| Polymeric Coated Corrugated Galvanized Pipe | Table 909-7 | Table 909-7 | 2.77(1) | |
Numbers represent the minimum durability gage requirements for the specific
pipe material.
(1) Permitted for 300 mm - 450 mm diameter 68 mm x 13 mm helically corrugated
pipe only.
| Material Thickness Chart | ||
| Guage | Inches | mm |
| 16 guage | .064 | 1.6 |
| 14 guage | .079 | 2.0 |
| 12 guage | .109 | 2.77 |
| 10 guage | .138 | 3.51 |
| 8 guage | .168 | 4.27 |
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