Ask X3What does 49 CFR 173.195 (Hydrogen cyanide, anhydrous, stabilized (hydrocyanic acid, aqueous solution)) require?
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According to 49 CFR 173.195, anhydrous, stabilized hydrogen cyanide must be packed in approved specification cylinders or UN pressure receptacles as follows:
* Packaged as prescribed in § 173.192.
* In Specification 3A480, 3A480X, 3AA480, or 3A1800 metal cylinders with a water capacity of no more than 126 kg (278 pounds) nominal.
* In 3AL cylinders (authorized only for highway and rail transport).
* In UN cylinders specified in part 178 that have a minimum test pressure of 100 bar and a maximum filling ratio of 0.55 (UN tubes and MEGCs are not allowed).
Additionally, the regulation requires:
* Cylinders must not be charged with more than 0.27 kg (0.6 pound) of liquid per 0.45 kg (1 pound) of the cylinder's water capacity.
* Before transport, every filled cylinder must be tested for leakage and show absolutely no leaks. This is done by passing a piece of Guignard's sodium picrate paper over the cylinder's closure (without the protection cap) to detect any escaping hydrogen cyanide, though other equally efficient test methods may be used.
* The packagings must also conform to § 173.40.