TABLE 1 TO §58.50-5(A)
Material | ASTM specification (all incorporated by reference; see 46 CFR 58.03-1 ) | Thickness in inches and gage numbers1 vs. tank capacities for- | ||
1- through 80-gallon tanks | More than 80- and not more than 150-gallon tanks | Over 150-gallon tanks2 | ||
Aluminum5 | B 209, Alloy 50866 | 0.250 (USSG 3) | 0.250 (USSG 3) | 0.250 (USSG 3). |
Nickel-copper | B 127, Hot rolled sheet or plate | 0.037 (USSG 20)3 | 0.050 (USSG 18) | 0.107 (USSG 12). |
Copper-nickel | B 122, Alloy No. 5 | 0.045 (AWG 17) | 0.057 (AWG 15) | 0.128 (AWG 8). |
Copper | B 152, Type ETP | 0.057 (AWG 15) | 0.080 (AWG 12) | 0.182 (AWG 5). |
Copper-silicon | B 96, alloys C65100 and C65500 | 0.050 (AWG 16) | 0.064 (AWG 14) | 0.144 (AWG 7). |
Steel or iron4 | 0.0747 (MfgStd 14) | 0.1046 (MfgStd 12) | 0.179 (MfgStd 7). |
Note:
1Gauges used are U.S. standard -USSG- for aluminum and nickel-copper; "AWG" for copper, copper-nickel and copper-silicon; and "MfgStd" for steel.
2Tanks over 400 gallons will be designed with a factor of safety of four on the ultimate strength of the material used with a design head of not less than 4 feet of liquid above the top of the tank.
3Nickel-copper not less than 0.031 inch (USSG 22) may be used for tanks up to a 30-gallon capacity.
4Fuel tanks constructed of iron or steel, which is less than 3/16 -inch thick must be galvanized inside and outside by the hot dip process.
5Anodic to most common metals. Avoid dissimilar metal contact with tank body.
6And other alloys acceptable to the Commandant.
46 C.F.R. § 58.50-5