Nonflammable, liquefied compressed gases

Gases in the nonflammable, liquefied compressed gas category include carbon dioxide, nitrous oxide, and others. Liquefied gases must be filled by weight, not by pressure. Note that... 

Carbon dioxide is classified as a nonflammable refrigerated liquid, class 2.2. It is typically transported at pressures between 150 psig and 300 psig (1030 kPa and 2070 kPa) as a liquefied compressed gas. 

Gaseous argon must be handled with all the precautions necessary for safety as with any nonflammable, nontoxic compressed gas. All precautions necessary for the safe handling of any gas liquefied at very low temperatures must be observed with liquid argon. Extensive tissue damage or bums can result from exposure to liquid argon or cold argon vapors. 

Sulfur hexafluoride is a colorless, odorless, nontoxic, nonflammable gas that has a high dielectric strength and serves widely as an insulating gas in electrical equipment. At atmospheric pressures it sublimes directly from the solid to the gas phase and does not have a stable liquid phase unless under a pressure of more than 32 psia (221 kPa, abs). It is shipped as a liquefied compressed gas at its vapor pressure of 298 psig at 70°F (2050 kPa at 21.1°C). 

A cylinder of compressed, non-liquefied gas, may be filled to the service pressure stamped on the cylinder shoulder if the fill temperature is 70°F or less. If the gas is a non-liquefied, nonflammable, and nonpoisonous gas then a 10% overfill is allowed if the cylinder has passed an extra overpressure test as indicated by a + sign stamped following the hydrotest date. 

Chlorine is a greenish-yellow, nonflammable gas with a distinctive, pungent odor. It is almost 2.5 times as heavy as air. The gas acts as a severe irritant if inhaled. Chlorine liquid has the color of clear amber and is about 1.5 times as heavy as water. It is shipped as a compressed liquefied gas having a vapor pressure of 86.767 psig at 70°F (598.24 kPa at 21.1°C). Chlorine is nonflammable in both gaseous and liquid states. However, like oxygen, it is capable of supporting the... 

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