Metal Loss Rate: Zone 2 (South of Albany) Zone 1 (North of Albany)
Galvanized- 4 mil/yr 2 mil/yr
Auminized- Add 25 yrs
16 gage = .064 inches = 64 mils
14 gage = .079 inches = 79 mils
Note: NYSDOT sets the design life at the point where there is 100% metal loss.
Note: PennDOT uses the reduced metal thickness, cross sectional area and radius of gyration at the
end of the service life to calculate the safety factor.
8 ga galv CSP properties reduce to 16 ga CSP in 50 years: 168 mil – (50 x 2 mil/yr) = 68 mil
For all metal pipes maintenance free service life, with respect to corrosion and abrasion and/or
durability, is the number of years from installation until the deterioration reaches the point of
perforation at any location on the culvert.
2. Use Figures 855.3A, 855.3B and 854.3C to determine the minimum thickness and limitation on the
use of steel, aluminum or aluminized steel (corrugated or spiral rib) pipe.
pH Stormwater = 6.0
Degree of Corrosiveness “Low” = 4,500 Table 5-3 Design Information Bulletin #83-01
Years to Perforation 16 gage Galvanized CSP = 17 years
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