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Code of Federal Regulations Title 49. Transportation § 49.178.346–2 Material and thickness of material

Current as of January 02, 2025 | Updated by Findlaw Staff

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

Volume capacity in gallons per inch of length

14 or less

Over 14 to 23

Over 23

Material

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

0.151

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

1 Maximum distance between bulkheads, baffles, or ring stiffeners shall not exceed 60 inches.

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Cite this article: FindLaw.com - Code of Federal Regulations Title 49. Transportation § 49.178.346–2 Material and thickness of material - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-49-transportation/cfr-sect-49-178-346-2/

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