Code of Federal Regulations (Last Updated: July 5, 2024) |
Title 49 - Transportation |
Subtitle B - Other Regulations Relating to Transportation |
Chapter I - Pipeline and Hazardous Materials Safety Administration, Department of Transportation |
Part 178 - Specifications for Packagings |
Subpart J - Specifications for Containers for Motor Vehicle Transportation |
§ 178.346-2 - Material and thickness of material.
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§ 178.346-2 Material and thickness of material.
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.
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
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 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 Forming1
Cargo tank motor vehicle rated capacity (gallons) MS SS/HSLA AL 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]