Code of Federal Regulations (Last Updated: April 5, 2024) |
Title 49 - Transportation |
Subtitle B - Other Regulations Relating to Transportation |
Chapter I - Pipeline and Hazardous Materials Safety Administration, Department of Transportation |
Part 179 - Specifications for Tank Cars |
Subpart D - Specifications for Non-Pressure Tank Car Tanks (Classes DOT-111AW, 115AW, and 117AW) |
§ 179.200-8 - Tank heads.
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§ 179.200-8 Tank heads.
(a) All external tank heads must be an ellipsoid of revolution in which the major axis must equal the diameter of the shell and the minor axis must be one-half the major axis.
(b) Internal compartment tank heads may be 2:1 ellipsoidal, 3:1 ellipsoidal, or flanged and dished to thicknesses as specified in § 179.200-6. Flanged and dished heads must have main inside radius not exceeding 10 feet, and inside knuckle radius must not be less than 33⁄4 inches for steel, alloy steel, or nickel tanks, and not less than 5 inches for aluminum alloy tanks.
[Amdt. 179-10, 36 FR 21350, Nov. 6, 1971]