49 C.F.R. § 178.348-2 Material and thickness of material.
Title 49 - Transportation
(a) The type and thickness of material for DOT 412 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. (b) [Reserved] [Amdt. 178–89, 54 FR 25031, June 12, 1989; 54 FR 28750, July 7, 1989, as amended at 55 FR 37065, Sept. 7, 1990; 68 FR 19285, Apr. 18, 2003]
Title 49: Transportation
PART 178—SPECIFICATIONS FOR PACKAGINGS
Subpart J—Specifications for Containers for Motor Vehicle Transportation
§ 178.348-2 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 (gallons per inch) 10 or less Over 10 to 14 Over 14 to 18 18 and over-------------------------------------------------------------------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------------------------------------------------------------------Lading density at 60 °F in pounds 10 lbs Over Over Over 10 lbs Over Over Over 10 lbs Over Over 10 lbs Over Over per gallon............................. and 10 to 13 to 16 lbs and 10 to 13 to 16 lbs and 10 to 13 to and 10 to 13 to less 13 lbs 16 lbs less 13 lbs 16 lbs less 13 lbs 16 lbs less 13 lbs 16 lbsThickness (inch), steel................. .100 .129 .157 .187 .129 .157 .187 .250 .157 .250 .250 .157 .250 .312Thickness (inch), aluminum.............. .144 .187 .227 .270 .187 .227 .270 .360 .227 .360 .360 .227 .360 .450--------------------------------------------------------------------------------------------------------------------------------------------------------
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 18 and over-------------------------------------------------------------------------------------------------------------------------------------------------------- --------------------------------------------------------------------------------------------------------------------------------------------------------Lading density at 60 °F in pounds 10 lbs Over Over Over 10 lbs Over Over Over 10 lbs Over Over 10 lbs Over Over per gallon............................. and 10 to 13 to 16 lbs and 10 to 13 to 16 lbs and 10 to 13 to and 10 to 13 to less 13 lbs 16 lbs less 13 lbs 16 lbs less 13 lbs 16 lbs less 13 lbs 16 lbsThickness (steel): Distances between heads (and bulkheads baffles and ring stiffeners when used as tank reinforcement): 36 in. or less.................. .100 .129 .157 .187 .100 .129 .157 .187 .100 .129 .157 .129 .157 .187 Over 36 in. to 54 inches........ .100 .129 .157 .187 .100 .129 .157 .187 .129 .157 .187 .157 .250 .250 Over 54 in. to 60 inches........ .100 .129 .157 .187 .129 .157 .187 .250 .157 .250 .250 .187 .250 .312Thickness (aluminum): Distances between heads (and bulkheads baffles and ring stiffeners when used as tank reinforcement): 36 in. or less.................. .144 .187 .227 .270 .144 .187 .227 .270 .144 .187 .227 .187 .227 .270 Over 36 in. to 54 inches........ .144 .187 .227 .270 .144 .187 .227 .270 .187 .227 .270 .157 .360 .360 Over 54 in. to 60 inches........ .144 .187 .227 .270 .187 .227 .270 .360 .227 .360 .360 .270 .360 .450--------------------------------------------------------------------------------------------------------------------------------------------------------
