Table 1 to § 58.50-10(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). |
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 and "MfgStd" for steel or iron.
2 Tanks over 400 gallons must 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 For diesel tanks the steel or iron must not be galvanized on the interior.
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. §§58.50-10