Articles containing non-flammable, non-toxic gas, n.o.s.

Except for articles being transported by motor vehicle as a material of trade in accordance with § 173.6 of this subchapter, articles containing hazardous materials of Division 2.3, or Division 4.2, or Division 4.3, or Division 5.1, or Division 5.2, or Division 6.1 (substances with an inhalation toxicity of Packing Group I) and articles containing more than one of the following hazards: (1) Gases of Class 2; (2) Liquid desensitized explosives of Class 3; or (3) Self-reactive substances and solid desensitized explosives of Division 4.1, may only be offered for transportation and transported under conditions approved by the Associate Administrator.

Browse special provision 391

Large and robust articles may be transported with connected gas cylinders with the valves open regardless of § 173.24(b)(1), provided:
a. The gas cylinders contain nitrogen of UN 1066 or compressed gas of UN 1956 or compressed air of UN1002;
b. The gas cylinders are connected to the article through pressure regulators and fixed piping in such a way that the pressure of the gas (gauge pressure) in the article does not exceed 35 kPa (0.35 bar);
c. The gas cylinders are properly secured so that they cannot shift in relation to the article and are fitted with strong and pressure resistant hoses and pipes;
d. The gas cylinders, pressure regulators, piping, and other components are protected from damage and impacts during transport by wooden crates or other suitable means;
e. The shipping paper must include the following statement: “Transport in accordance with special provision 396”; and
f. Cargo transport units containing articles transported with cylinders with open valves containing a gas presenting a risk of asphyxiation are well ventilated.

Browse special provision 396

UN3538, Articles containing non-flammable, non-toxic gas, n.o.s. may be transported on passenger and cargo-only aircraft irrespective of the indication of “forbidden” in Columns (9A) and (9B) of the Hazardous Materials Table, provided: (a) with the exception of lithium cells or batteries that comply with § 173.185(c), as applicable, the only dangerous good contained in the article is a Division 2.2 gas without a subsidiary hazard, but excluding refrigerated liquefied gases and gases forbidden for transport on passenger aircraft; (b) the articles are packed in accordance with § 173.232(h); and (c) reference to Special Provision A225 is made on the shipping paper.

Browse special provision A225

A

Stowage category “A” means the material may be stowed “on deck” or “under deck” on a cargo vessel or on a passenger vessel.

Source: 49 CFR §172.101(k)