TABLE I-SPECIFIED MINIMUM THICKNESS OF HEADS (OR BULKHEADS AND BAFFLES WHEN USED AS TANK REINFORCEMENT) USING MILD STEEL (MS), HIGH STRENGTH LOW ALLOY STEEL (HSLA), AUSTENITIC STAINLESS STEEL (SS), OR ALUMINUM (AL)-EXPRESSED IN DECIMALS OF AN INCH AFTER FORMING
Volume capacity in gallons per inch | 10 or less | Over 10 to 14 | Over 14 to 18 | Over 18 to 22 | Over 22 to 26 | Over 26 to 30 | Over 30 |
Thickness (MS) | 0.100 | 0.100 | 0.115 | 0.129 | 0.129 | 0.143 | 0.156 |
Thickness (HSLA) | 0.100 | 0.100 | 0.115 | 0.129 | 0.129 | 0.143 | 0.156 |
Thickness (SS) | 0.100 | 0.100 | 0.115 | 0.129 | 0.129 | 0.143 | 0.156 |
Thickness (AL) | 0.160 | 0.160 | 0.173 | 0.187 | 0.194 | 0.216 | 0.237 |
TABLE II-SPECIFIED MINIMUM THICKNESS OF SHELL USING MILD STEEL (MS), HIGH STRENGTH LOW ALLOY STEEL (HSLA), AUSTENITIC STAINLESS STEEL (SS), OR ALUMINUM (AL)-EXPRESSED IN DECIMALS OF AN INCH AFTER FORMING
Volume capacity in gallons per inch | 10 or less | Over 10 to 14 | Over 14 to 18 | Over 18 to 22 | Over 22 to 26 | Over 26 to 30 | Over 30 |
Thickness (MS) | 0.100 | 0.100 | 0.115 | 0.129 | 0.129 | 0.143 | 0.156 |
Thickness (HSLA) | 0.100 | 0.100 | 0.115 | 0.129 | 0.129 | 0.143 | 0.156 |
Thickness (SS) | 0.100 | 0.100 | 0.115 | 0.129 | 0.129 | 0.143 | 0.156 |
Thickness (AL) | 0.151 | 0.151 | 0.160 | 0.173 | 0.194 | 0.216 | 0.237 |
49 C.F.R. §178.347-2