Liquefied compressed gas.
Liquefied compressed gas. A gas, which when packaged under pressure for transportation is partially liquid at temperatures above 50 C (58 F), is considered to be a liquefied compressed gas. A liquefied compressed gas is further categorized as follows:
(1) High pressure liquefied gas which is a gas with a critical temperature between −50 °C (−58 °F) and + 65 °C (149 °F), and
(2) Low pressure liquefied gas which is a gas with a critical temperature above + 65 °C (149 °F).
(f) Compressed gas in solution. A compressed gas in solution is a non-liquefied compressed gas which is dissolved in a solvent.
(g) Cryogenic liquid. A cryogenic liquid means a refrigerated liquefied gas having a boiling point colder than −90 °C (−130 °F) at 101.3 kPa (14.7 psia) absolute. A material meeting this definition is subject to requirements of this subchapter without regard to whether it meets the definition of a non-flammable, non-poisonous compressed gas in paragraph (b) of this section.
(h) Flammable range. The term flammable range means the difference between the minimum and maximum volume percentages of the material in air that forms a flammable mixture.
(i) Service pressure. The term service pressure means the authorized pressure marking on the packaging. For example, for a cylinder marked “DOT 3A1800”, the service pressure is 12410 kPa (1800 psig).
(j) Refrigerant gas or Dispersant gas. The terms Refrigerant gas and Dispersant gas apply to all nonpoisonous refrigerant gases; dispersant gases (fluorocarbons) listed in § 172.101 of this subchapter and §§ 173.304, 173.314(c), 173.315(a), and 173.315(h) and mixtures thereof; and any other compressed gas having a vapor pressure not exceeding 260 psia at 54 °C(130 °F), used only as a refrigerant, dispersant, or blowing agent.
(k) For Division 2.2 gases, the oxidizing ability shall be determined by tests or by calculation in accordance with ISO 10156 (including Technical Corrigendum 1) (IBR, see § 171.7 of this subchapter).