Table 1 to § 58.50-5(a)(2)
Material | ASTM specification (all incorporated by reference; see § 58.03-1 ) | Thickness in inches and gage numbers 1 vs. tank capacities for- | ||
1- through 80-gallon tanks | More than 80- and not more than 150-gallon tanks | Over 150-gallon tanks 2 | ||
Aluminum 5 | B209, Alloy 5086 6 | 0.250 (USSG 3) | 0.250 (USSG 3) | 0.250 (USSG 3). |
Nickel-copper | B127, Hot rolled sheet or plate | 0.037 (USSG 20) 3 | 0.050 (USSG 18) | 0.107 (USSG 12). |
Copper-nickel | B122, Alloy No. 5 | 0.045 (AWG 17) | 0.057 (AWG 15) | 0.128 (AWG 8). |
Copper | B152, Type ETP | 0.057 (AWG 15) | 0.080 (AWG 12) | 0.182 (AWG 5). |
Copper-silicon | B96, alloys C65100 and C65500 | 0.050 (AWG 16) | 0.064 (AWG 14) | 0.144 (AWG 7). |
Steel or iron 4 | 0.0747 (MfgStd 14) | 0.1046 (MfgStd 12) | 0.179 (MfgStd 7). |
1 Gauges used are U.S. standard "USSG" for aluminum and nickel-copper; "AWG" for copper, copper-nickel, and copper-silicon; and "MfgStd" for steel.
2 Tanks 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.
3 Nickel-copper not less than 0.031 inch (USSG 22) may be used for tanks up to a 30-gallon capacity.
4 Fuel 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.
5 Anodic to most common metals. Avoid dissimilar metal contact with tank body.
6 And other alloys acceptable to the Commandant.
46 C.F.R. §§58.50-5