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 Code of Federal Regulations (Last Updated: November 8, 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 C - Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120)

  § 179.101-1 - Individual specification requirements.  

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  • § 179.101-1 Individual specification requirements.

    In addition to § 179.100, the individual specification requirements are as follows:

    DOT specification Insulation Bursting pressure (psig) Minimum plate thickness (inches) Test pressure (psig) Manway cover thickness Bottom outlet Bottom washout Reference
    (179.***)
    105A100ALW Yes 500 5/8 100 2 2 1/2 No No
    105A200ALW Yes 500 5/8 200 2 2 1/2 No No
    105A300ALW Yes 750 5/8 300 2 2 5/8 No No
    105A100W Yes 500 3 9/16 100 2 1/4 No No
    105A200W Yes 500 3 9/16 200 2 1/4 No No
    105A300W Yes 750 1 11/16 300 7 2 1/4 No No
    105A400W Yes 1,000 1 11/16 400 7 2 1/4 No No
    105A500W Yes 1,250 1 11/16 500 2 1/4 No No 102-1, 102-2
    105A600W Yes 1,500 1 11/16 600 2 1/4 No No 102-4, 102-17
    109A100ALW Optional 500 5/8 100 2 2 1/2 No Optional
    109A200ALW Optional 500 5/8 200 2 2 1/2 No Optional
    109A300ALW Optional 750 5/8 300 2 2 5/8 No Optional
    109A300W Optional 500 1 11/16 300 2 1/4 No Optional
    112A200W Optional4 500 3 5 9/16 200 2 1/4 No No
    112A340W Optional4 850 1 11/16 340 2 1/4 No No
    112A400W Optional4 1,000 1 11/16 400 2 1/4 No No
    112A500W Optional4 1,250 1 11/16 500 2 1/4 No No
    114A340W Optional4 850 1 11/16 340 6 Optional Optional 103
    114A400W Optional4 1,000 1 11/16 400 6 Optional Optional 103
    120A200ALW Yes 500 5/8 200 2 2 1/2 Optional Optional 103
    120A100W Yes 500 3 9/16 100 2 1/4 Optional Optional 103
    120A200W Yes 500 3 9/16 200 2 1/4 Optional Optional 103
    120A300W Yes 750 1 11/16 300 2 1/4 Optional Optional 103
    120A400W Yes 1,000 1 11/16 400 2 1/4 Optional Optional 103
    120A500W Yes 1,250 1 11/16 500 2 1/4 Optional Optional 103

    1 When steel of 65,000 to 81,000 p.s.i. minimum tensile strength is used, the thickness of plates shall be not less than 5⁄8 inch, and when steel of 81,000 p.s.i. minimum tensile strength is used, the minimum thickness of plate shall be not less than 9⁄16 inch.

    2 When approved material other than aluminum alloys are used, the thickness shall be not less than 21⁄4 inches.

    3 When steel of 65,000 p.s.i. minimum tensile strength is used, minimum thickness of plates shall be not less than 1⁄2 inch.

    4 Tank cars not equipped with a thermal protection or an insulation system used for the transportation of a Class 2 (compressed gas) material must have at least the upper two-thirds of the exterior of the tank, including manway nozzle and all appurtenances in contact with this area, finished with a reflective coat of white paint.

    5 For inside diameter of 87 inches or less, the thickness of plates shall be not less than 1⁄2 inch.

    6 See AAR Specifications for Tank Cars, appendix E, E4.01 (IBR, see § 171.7 of this subchapter), and § 179.103-2.

    7 When the use of nickel is required by the lading, the thickness shall not be less than two inches.

    [Amdt. 179-52, 61 FR 28679, June 5, 1996, as amended at 66 FR 45390, Aug. 28, 2001; 68 FR 75760, Dec. 31, 2003]