{"data":{"id":"us/49-cfr-179.101-1","jurisdiction":"us","citation":"49 CFR 179.101-1","heading":"-1 Individual specification requirements.","body":"In addition to § 179.100, the individual specification requirements are as follows:\nDOT specification Insulation Bursting pressure (psig) Minimum plate thickness (inches) Test pressure (psig) Manway cover thickness Bottom outlet Bottom washout Reference (179.***)\n105A100ALW Yes 500 5/8 100 2 2 1/2 No No\n105A200ALW Yes 500 5/8 200 2 2 1/2 No No\n105A300ALW Yes 750 5/8 300 2 2 5/8 No No\n105A100W Yes 500 3 9/16 100 2 1/4 No No\n105A200W Yes 500 3 9/16 200 2 1/4 No No\n105A300W Yes 750 1 11/16 300 7 2 1/4 No No\n105A400W Yes 1,000 1 11/16 400 7 2 1/4 No No\n105A500W Yes 1,250 1 11/16 500 2 1/4 No No 102-1, 102-2\n105A600W Yes 1,500 1 11/16 600 2 1/4 No No 102-4, 102-17\n109A100ALW Optional 500 5/8 100 2 2 1/2 No Optional\n109A200ALW Optional 500 5/8 200 2 2 1/2 No Optional\n109A300ALW Optional 750 5/8 300 2 2 5/8 No Optional\n109A300W Optional 500 1 11/16 300 2 1/4 No Optional\n112A200W Optional 4 500 3 5 9/16 200 2 1/4 No No\n112A340W Optional 4 850 1 11/16 340 2 1/4 No No\n112A400W Optional 4 1,000 1 11/16 400 2 1/4 No No\n112A500W Optional 4 1,250 1 11/16 500 2 1/4 No No\n114A340W Optional 4 850 1 11/16 340 6 Optional Optional 103\n114A400W Optional 4 1,000 1 11/16 400 6 Optional Optional 103\n120A200ALW Yes 500 5/8 200 2 2 1/2 Optional Optional 103\n120A100W Yes 500 3 9/16 100 2 1/4 Optional Optional 103\n120A200W Yes 500 3 9/16 200 2 1/4 Optional Optional 103\n120A300W Yes 750 1 11/16 300 2 1/4 Optional Optional 103\n120A400W Yes 1,000 1 11/16 400 2 1/4 Optional Optional 103\n120A500W Yes 1,250 1 11/16 500 2 1/4 Optional Optional 103\n1 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.\n2 When approved material other than aluminum alloys are used, the thickness shall be not less than 21⁄4 inches.\n3 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.\n4 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.\n5 For inside diameter of 87 inches or less, the thickness of plates shall be not less than 1⁄2 inch.\n6 See AAR Specifications for Tank Cars, appendix E, E4.01 (IBR, see § 171.7 of this subchapter), and § 179.103-2.\n7 When the use of nickel is required by the lading, the thickness shall not be less than two inches.","path":["Title 49—Transportation","Subtitle B—Other Regulations Relating to Transportation","CHAPTER I—PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION","SUBCHAPTER C—HAZARDOUS MATERIALS REGULATIONS","PART 179—SPECIFICATIONS FOR TANK CARS","Subpart C—Specifications for Pressure Tank Car Tanks (Classes DOT-105, 109, 112, 114 and 120)"],"source_url":"https://www.ecfr.gov/api/versioner/v1/full/2026-08-25/title-49.xml","current_through":"2026-08-25","vintage":"","retrieved_at":"2026-08-27T02:26:34Z","sha256":"72652cdeed4bdc50787a505a76258efecbbae9f4613958513da9306dbcd46ad2","source_id":"us-cfr","stale":true,"prev":"us/49-cfr-179.101","next":"us/49-cfr-179.102"},"notice":"GroundRules: Original legal text. Not legal advice."}