49 CFR § 179.201-1 - Individual specification requirements.

---
identifier: "/us/cfr/t49/s179.201-1"
source: "ecfr"
legal_status: "authoritative_unofficial"
title: "49 CFR § 179.201-1 - Individual specification requirements."
title_number: 49
title_name: "Transportation"
section_number: "179.201-1"
section_name: "Individual specification requirements."
chapter_name: "PIPELINE AND HAZARDOUS MATERIALS SAFETY ADMINISTRATION, DEPARTMENT OF TRANSPORTATION"
subchapter_number: "C"
subchapter_name: "HAZARDOUS MATERIALS REGULATIONS"
part_number: "179"
part_name: "SPECIFICATIONS FOR TANK CARS"
positive_law: false
currency: "2026-03-24"
last_updated: "2026-03-24"
format_version: "1.1.0"
generator: "[email protected]"
authority: "49 U.S.C. 5101-5128; 49 CFR 1.81 and 1.97."
regulatory_source: "29 FR 18995, Dec. 29, 1964, unless otherwise noted. Redesignated at 32 FR 5606, Apr. 5, 1967."
cfr_part: "179"
---


# 179.201-1 Individual specification requirements.

In addition to § 179.200, the individual specification requirements are as follows:

| DOT Specification | Insulation | Bursting pressure (psig) | Minimum platethickness (inches) | Testpressure (psig) | Bottomoutlet | Bottomwashout | References (179.201 - ***) |
| --- | --- | --- | --- | --- | --- | --- | --- |
| 111A60ALW1 | Optional | 240 | ⁄ | 60 | Optional | Optional | 6(a). |
| 111A60ALW2 | Optional | 240 | ⁄ | 60 | No | Optional. |  |
| 111A60W1 | Optional | 240 | ⁄ | 60 | Optional | Optional | 6(a). |
| 111A60W2 | Optional | 240 | ⁄ | 60 | No | Optional. |  |
| 111A60W5 | Optional | 240 | ⁄ | 60 | No | No | 3, 6(b). |
| 111A60W6 | Optional | 240 | ⁄ | 60 | Optional | Optional | 4, 5, 6(a), 6(c). |
| 111A60W7 | Optional | 240 | ⁄ | 60 | No | No | 4, 5, 6(a). |
| 111A100ALW1 | Optional | 500 | ⁄ | 100 | Optional | Optional | 6(a). |
| 111A100ALW2 | Optional | 500 | ⁄ | 100 | No | Optional. |  |
| 111A100W1 | Optional | 500 | ⁄ | 100 | Optional | Optional | 6(a). |
| 111A100W2 | Optional | 500 | ⁄ | 100 | No | Optional. |  |
| 111A100W3 | Yes | 500 | ⁄ | 100 | Optional | Optional | 6(a). |
| 111A100W4 | Yes (see 179.201-11) | 500 | ⁄ | 100 | No | No | 6(a), 8, 10. |
| 111A100W5 | Optional | 500 | ⁄ | 100 | No | No | 3. |
| 111A100W6 | Optional | 500 | ⁄ | 100 | Optional | Optional | 4, 5, 6(a) and 6(c). |
| 111A100W7 | Optional | 500 | ⁄ | 100 | No | No | 4, 5, 6(c). |
| Tanks marked “ALW” are constructed from aluminum alloy plate; “AN” nickel plate; “CW,” “DW,” “EW,” “W6,” and “W7” high alloy steel or manganese-molybdenum steel plate; and those marked “BW” or “W5” must have an interior lining that conforms to § 179.201-3. |  |  |  |  |  |  |  |

[Amdt. 179-52, 61 FR 28680, June 5, 1996, as amended by 66 FR 45390, Aug. 28, 2001; 68 FR 48571, Aug. 14, 2003]