49 C.F.R. §§ 179.101-1
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.
49 C.F.R. §§179.101-1