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The type and thickness of material for DOT 406 specification cargo tanks must conform to §178.345-2, but in no case may the thickness be less than that determined by the minimum thickness requirements in §178.320(a). The following Tables I and II identify the specified minimum thickness values to be employed in that determination.
Material | Volume capacity in gallons per inch of length | ||||||||
---|---|---|---|---|---|---|---|---|---|
14 or less | Over 14 to 23 | Over 23 | |||||||
MS | HSLA SS | AL | MS | HSLA SS | AL | MS | HSLA SS | AL | |
Thickness | .100 | .100 | .160 | .115 | .115 | .173 | .129 | .129 | .187 |
Cargo tank motor vehicle rated capacity (gallons) | MS | SS/HSLA | AL |
---|---|---|---|
1Maximum distance between bulkheads, baffles, or ring stiffeners shall not exceed 60 inches. | |||
More than 0 to at least 4,500 | 0.100 | 0.100 | 0.151 |
More than 4,500 to at least 8,000 | 0.115 | 0.100 | 0.160 |
More than 8,000 to at least 14,000 | 0.129 | 0.129 | 0.173 |
More than 14,000 | 0.143 | 0.143 | 0.187 |
[Amdt. 178–89, 54 FR 25028, June 12, 1989, as amended at 55 FR 37064, Sept. 7, 1990; Amdt. 178–105, 59 FR 55176, Nov. 3, 1994; 68 FR 19285, Apr. 18, 2003]