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In general, the regs require that when filling packagings and receptacles for liquids, sufficient outage must be left to ensure that neither leakage nor permanent distortion of the packaging or receptacle will occur as a result of an expansion of the liquid caused by temperatures likely to be encountered during transportation.
Outage requirements apply to anyone filling a liquid material into a package.
The regulations refer to the term in several places, generally in the context of tank cars and often specific hazardous materials such as compressed gases, poisons, and cryogenic liquids. Elsewhere, it is referred to in the context of package testing requirements and specifications for gauging devices. Special provisions noted in Column 7 of the HMT also contain outage requirements that apply in addition to all standard packaging requirements for tanks on tank cars.
Requirements for outage and filling limits for non-bulk and bulk packagings are specified in 173.24a(d) and 173.24b(a), respectively.