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§178.348-2 Material and thickness of material.

RegSensePipeline and Hazardous Materials Safety Administration (PHMSA), DOTCargo tanks - HazmatCFR RegulationsHazmat SafetyFocus AreaCFR SectionGeneral Packaging Requirements - HazmatEnglishTransportationUSA

(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 lessOver 10 to 14Over 14 to 1818 and over
Lading density at 60 °F in pounds per gallon10 lbs and lessOver 10 to 13 lbsOver 13 to 16 lbsOver 16 lbs10 lbs and lessOver 10 to 13 lbsOver 13 to 16 lbsOver 16 lbs10 lbs and lessOver 10 to 13 lbsOver 13 to 16 lbs10 lbs and lessOver 10 to 13 lbsOver 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 inch10 or lessOver 10 to 14Over 14 to 1818 and over
Lading density at 60 °F in pounds per gallon10 lbs and lessOver 10 to 13 lbsOver 13 to 16 lbsOver 16 lbs10 lbs and lessOver 10 to 13 lbsOver 13 to 16 lbsOver 16 lbs10 lbs and lessOver 10 to 13 lbsOver 13 to 16 lbs10 lbs and lessOver 10 to 13 lbsOver 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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