CFR /  Title 46  /  Part 30  /  Sec. 30.10-39 Liquefied flammable gas--TB/ALL.

The term liquefied flammable gas means any flammable gas having a Reid vapor pressure exceeding 40 pounds, which has been liquefied. [CGFR 66-33, 31 FR 15267, Dec. 6, 1966]