High-Pressure Gas
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Gas is conventionally classified into compressed gas, liquefied gas, and dissolved gas. In terms of gas property, it is divided into flammable gas, oxidizing gas, and inflammable gas.
In terms of toxicity of gas, it is classified into toxic gas and non-toxic gas.
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Gas state
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Category Property Example Compressed gas It is difficult to liquefy this gas even when it is compressed at room temperature. Its critical temperature (maximum temperature at which the gas becomes a liquid) is lower than room temperature. Thus, if it is compressed at room temperature, it is not liquefied while being compressed to a gaseous state. Hydrogen, oxygen, nitrogen, methane, etc. Liquefied gas This gas is relatively easily liquefied by pressurization or cooling at room temperature. Its critical temperature is higher than room temperature. Thus, if it is compressed at room temperature, it is charged into a container in a liquid state. Liquefied ammonia, chlorine, propane, ethylene oxide, etc. Solution gas Due to the unique property of this gas, it is dissolved in a porous medium propelled by solvent. As acetylene is decomposed and exploded if it is compressed or liquefied, it should be dissolved and charged with a solvent (acetone, dimethyl formamide, etc.) that well dissolves porous medium and gas in a container. Acetylene
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Flammability
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Category Property Example Flammable gas This gas combines with oxygen and burns with light and heat. There are 32 types of gas like hydrogen, methane, ethane, and propane and the gases that burn in the air and whose explosion lower limit is below 10 % and gas between explosion upper and lower limits is 20 % or more. Methane, ethane, propane, butane, hydrogen, etc. Inflammable gas This gas does not burn by itself and make other substances burn. Inert gas such as nitrogen, carbon dioxide, and argon. Oxidizing gas This gas is needed to burn flammable gases. Air, oxygen, chlorine, etc.
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Toxicity
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Category Property Example Toxic gas If there is a certain amount of this gas in the air, it is harmful to the human body. Its allowable concentration is below 200 ppm. 31 types of gases such as chlorine, ammonia, and carbon monoxide Non-toxic gas Even though there is a certain amount of this gas in the air, it is not harmful to the human body. Oxygen, hydrogen, etc.
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High-pressure gas under the High-Pressure Gas Safety Control Act
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Category Definition Compressed gas This compressed gas with a pressure of 10 ㎏/㎠ or higher at working temperature actually has its pressure, 10 ㎏/㎠ or higher, and 10㎏/㎠ or higher at 35 oc Liquefied gas This liquefied gas with a pressure of 2 ㎏/㎠ or higher at working temperature actually has its pressure, 2 ㎏/㎠ or higher, and 2 ㎏/㎠ at 35 oc Solution gas Acetylene with a pressure of higher than 0 ㎏/㎠ at 15 oc Specified gas Specified gas with a pressure of higher than 0 ㎏/㎠ at 35 oc (liquefied hydrogen cyanide, liquefied methyl bromide, liquefied ethylene oxide)
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