49 C.F.R. § 178.346-2 Material and thickness of material.
Title 49 - Transportation
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. [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]
Title 49: Transportation
PART 178—SPECIFICATIONS FOR PACKAGINGS
Subpart J—Specifications for Containers for Motor Vehicle Transportation
§ 178.346-2 Material and thickness of material.
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 of length -------------------------------------------------------------------------------- Material 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 Forming \1\------------------------------------------------------------------------ Cargo tank motor vehicle rated capacity (gallons) MS SS/HSLA AL------------------------------------------------------------------------More than 0 to at least 4,500............ 0.100 0.100 0.151More than 4,500 to at least 8,000........ 0.115 0.100 0.160More than 8,000 to at least 14,000....... 0.129 0.129 0.173More than 14,000......................... 0.143 0.143 0.187------------------------------------------------------------------------\1\ Maximum distance between bulkheads, baffles, or ring stiffeners shall not exceed 60 inches.
