This post is intended to compile in one place the references to the specific sections of the Code of Federal Regulations (CFR) that specify how the cylinders must be marked for them to be legal to be filled and transported in the US, as well as an explicit rule that they can't be transported otherwise.
I'm preparing for a small claims court date, and couldn't find all this info in one place anywhere, so hopefully it may help someone doing this research in the future.
Code of Federal Regulations (CFR) Title 49:
· Part 173, Subpart G, § 173.301 specifies the requirements for shipment of compressed gases and other hazardous materials in cylinders
· Part 178, Subpart C specifies the requirements for cylinders used to transport hazardous materials
· Part 180 focuses on the continuing qualification and maintenance of packagings, including subpart C on cylinders.
Part 173 (General Requirements For Shipments And Packagings):
· § 173.301 General requirements for shipment of compressed gases and other hazardous materials in cylinders, UN pressure receptacles, and spherical pressure vessels
(a).(1) Compressed gases must be in UN pressure receptacles built in accordance with the UN standards or in metal cylinders and containers built in accordance with the DOT and ICC specifications and
part 178 of this subchapter in effect at the time of manufacture or CRC, BTC, CTC or TC specification, and requalified and marked as prescribed in subpart C in
part 180 of this subchapter, if applicable.
(j)
Non-specification cylinders in domestic use.
… a filled cylinder manufactured to other than a DOT specification or a UN standard in accordance with
part 178 of this subchapter, or a DOT exemption or special permit cylinder or a cylinder used as a fire extinguisher in conformance with
§ 173.309(a), may not be transported to, from, or within the United States.
Part 178 (Specifications for Packagings):
Subpart C—Specifications for Cylinders
§ 178.35 General requirements for specification cylinders.
(f)
Markings. Markings on a DOT Specification cylinder must conform to applicable requirements.
(1) Each cylinder must be marked with the following information:
(i) The DOT specification marking must appear first, followed immediately by the service pressure. For example, DOT-3A1800.
(ii) The serial number must be placed just below or immediately following the DOT specification marking.
(iii) A symbol (letters) must be placed just below, immediately before or following the serial number. Other variations in sequence of markings are authorized only when necessitated by a lack of space. The symbol and numbers must be those of the manufacturer. The symbol must be registered with the Associate Administrator; duplications are not authorized.
(iv) The inspector's official mark and date of test (such as 5-95 for May 1995) must be placed near the serial number. This information must be placed so that dates of subsequent tests can be easily added. An example of the markings prescribed in this
paragraph (f)(1) is as follows:
DOT-3A1800-1234-XY
AB 5-95
Where:
DOT-3A = specification number; 1800 = service pressure; 1234 = serial number; XY = symbol of manufacturer; AB = inspector's mark; 5-95 = date of test
Part 180 (Continuing Qualification and Maintenance of Packagings):
Subpart C—Qualification, Maintenance and Use of Cylinders
§ 180.205 General requirements for requalification of specification cylinders.
(c)
Periodic requalification of cylinders. Each cylinder bearing a DOT, CRC, BTC, or CTC specification marking must be requalified and marked as specified in the requalification table in
§ 180.209(a) or requalified and marked by a facility registered by Transport Canada in accordance with the Transport Canada TDG Regulations (IBR, see
§ 171.7 of this subchapter).
Specification under which cylinder was made |
Minimum test pressure
(psig)2 |
Requalification period
(years) |
3 |
3000 psig |
5. |
3A, 3AA | 5/3 times service pressure, except non-corrosive service (see § 180.209(g)) |
5, 10, or 12 (see § 180.209(b), (f), (h), and (j)). |
3AL |
5/3 times service pressure |
5 or 12 (see § 180.209(j) and (m)4). |
… |
… |
… |
§ 180.209(b): stipulates cylinders that may be requalified every ten years instead of every five years exclude cylinders used for underwater breathing.