Ask X3What does 49 CFR 173.192 (Packaging for certain toxic gases in Hazard Zone A) require?
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According to 49 CFR 173.192, when a toxic material must be packaged under this section, you must follow these practical rules:
* Authorized Cylinders: You may only use specific cylinders: Specification 3A1800, 3AA1800, 3AL1800, 3E1800, or seamless UN cylinders that have a minimum test pressure meeting P200 of the UN Recommendations.
* Size Limits for 3A, 3AA, and 3AL Cylinders: These cylinders cannot exceed a nominal water capacity of 57 kg (125 lb).
* Transport Restrictions for 3AL Cylinders: Specification 3AL cylinders can only be transported by highway and rail.
* General Packaging Requirements: All packagings must meet the requirements of § 173.40.
* Rules Specifically for Phosgene: If your cylinders contain phosgene:
* The filling density cannot exceed 125 percent.
* A single cylinder cannot hold more than 68 kg (150 lb) of phosgene.
* You must test every cylinder for leaks before offering it for transport, and it must show zero leakage.
* The Leakage Test: Immerse the cylinder and its valve (without the protective cap) in a water bath at roughly 66 °C (150 °F) for at least 30 minutes, checking frequently for escaping gas. You must not loosen the cylinder valve after this test, and you must use suitable safeguards to protect workers and facilities in case the cylinder fails during the test. Alternatively, you may test for leaks using a method approved in writing by the Associate Administrator.