49 CFR 179.101-1 - Individual specification requirements.

Regulations last checked for updates: May 01, 2025

Title 49 - Transportation last revised: Mar 20, 2025

View all text of Subpart C [§ 179.100 - § 179.103-5]

§ 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	Optional ⁴	500	^{3 5} 9/16	200	2 1/4	No	No
112A340W	Optional ⁴	850	¹ 11/16	340	2 1/4	No	No
112A400W	Optional ⁴	1,000	¹ 11/16	400	2 1/4	No	No
112A500W	Optional ⁴	1,250	¹ 11/16	500	2 1/4	No	No
114A340W	Optional ⁴	850	¹ 11/16	340	⁶	Optional	Optional	103
114A400W	Optional ⁴	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 2 1/4 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]

authority: 49 U.S.C. 5101-5128; 49 CFR 1.81 and 1.97

source: 29 FR 18995, Dec. 29, 1964, unless otherwise noted. Redesignated at 32 FR 5606, Apr. 5, 1967.

cite as: 49 CFR 179.101-1