49 CFR 172 Special Provision N65 (N-Codes)

These provisions apply only to non-bulk packagings.
DescriptionOutage must be sufficient to prevent cylinders or spheres from becoming liquid full at 55 °C (130 °F). The vacant space (outage) may be charged with a nonflammable nonliquefied compressed gas if the pressure in the cylinder or sphere at 55 °C (130 °F) does not exceed 125 percent of the marked service pressure.
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