Ask X3What does 49 CFR 173.304a (Additional requirements for shipment of liquefied compressed gases in specification cylinders) require?
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According to 49 CFR 173.304a, when you offer liquefied compressed gases for transportation (excluding gases in solution), you must do so using approved specification cylinders and follow detailed filling requirements. Specifically:
1. Authorized Cylinders: You must use the specific DOT specification cylinders listed in the regulations (such as DOT 3, 3A, 3AA, 3AL, 3B, 3BN, 3E, 4B, 4BA, 4B240ET, 4BW, 4E, or 39, depending on the gas). Note that DOT 4E and 39 cylinders cannot be used for mixtures containing pyrophoric liquids, carbon bisulfide (disulfide), ethyl chloride, ethylene oxide, nickel carbonyl, spirits of nitroglycerin, or toxic materials (Division 6.1 or 2.3) unless specifically authorized.
2. Filling Densities and Packaging Rules: For each specific kind of gas, you must strictly follow the maximum permitted filling density (the weight ratio of the gas compared to the weight of water the container holds at 60 °F) and use the exact packaging types listed in the regulation's table.
Always verify your specific gas type against the regulation table to ensure you use the correct cylinder and do not exceed the allowed filling density.