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Code of Federal Regulations Title 49. Transportation § 49.178.347–2 Material and thickness of material

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

(a) The type and thickness of material for DOT 407 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). Tables I and II identify the specified minimum thickness values to be employed in that the 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

10 or
less

Over 10
to 14

Over 14
to 18

Over 18
to 22

Over 22
to 26

Over 26
to 30

Over 30

Thickness (MS)․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

0.100

0.100

0.115

0.129

0.129

0.143

0.156

Thickness (HSLA)․․․․․․․․․․․․․․․․․․․․․․․․․․․

0.100

0.100

0.115

0.129

0.129

0.143

0.156

Thickness (SS)․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

0.100

0.100

0.115

0.129

0.129

0.143

0.156

Thickness (AL)․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

0.160

0.160

0.173

0.187

0.194

0.216

0.237

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

Over 18
to 22

Over 22
to 26

Over 26
to 30

Over 30

Thickness (MS)․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

0.100

0.100

0.115

0.129

0.129

0.143

0.156

Thickness (HSLA)․․․․․․․․․․․․․․․․․․․․․․․․․․․

0.100

0.100

0.115

0.129

0.129

0.143

0.156

Thickness (SS)․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

0.100

0.100

0.115

0.129

0.129

0.143

0.156

Thickness (AL)․․․․․․․․․․․․․․․․․․․․․․․․․․․․․

0.151

0.151

0.160

0.173

0.194

0.216

0.237

(b) [Reserved]

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Cite this article: FindLaw.com - Code of Federal Regulations Title 49. Transportation § 49.178.347–2 Material and thickness of material - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-49-transportation/cfr-sect-49-178-347-2/

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