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Code of Federal Regulations Title 49. Transportation § 49.178.348–2 Material and thickness of material

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

(a) The type and thickness of material for DOT 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.

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 per gallon.

10 lbs
and
less

Over
10 to
13 lbs

Over
13 to
16 lbs

Over
16 lbs

10 lbs
and less

Over
10 to
13 lbs

Over
13 to
16 lbs

Over
16 lbs

10 lbs
and
less

Over
10 to
13 lbs

Over
13 to
16 lbs

10 lbs
and less

Over
10 to
13 lbs

Over
13 to
16 lbs

Thickness (inch), steel.․․․․․․․․․

.100

.129

.157

.187

.129

.157

.187

.250

.157

.250

.250

.157

.250

.312

Thickness (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 per gallon

10 lbs
and
less

Over
10 to
13 lbs

Over
13 to
16 lbs

Over
16 lbs

10 lbs
and less

Over
10 to
13 lbs

Over
13 to
16 lbs

Over
16 lbs

10 lbs
and
less

Over
10 to
13 lbs

Over
13 to
16 lbs

10 lbs
and
less

Over
10 to
13 lbs

Over
13 to
16 lbs

Thickness (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

.312

Thickness (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

(b) [Reserved]

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Cite this article: FindLaw.com - Code of Federal Regulations Title 49. Transportation § 49.178.348–2 Material and thickness of material - last updated January 02, 2025 | https://codes.findlaw.com/cfr/title-49-transportation/cfr-sect-49-178-348-2/

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