Oxygen is a colorless, odorless and tasteless gas. It is a combustion promoter. It can be mixed with combustible gas (acetylene, methane, etc.) in a certain proportion to form explosive mixture. When the oxygen concentration in the air increases to 25%, it can stimulate active combustion reaction; When the oxygen concentration reaches 27%, a spark can develop into a lively flame. Therefore, fireworks are strictly prohibited in the oxygen workshop and around the oxygen generation device. When the clothes are saturated with oxygen, they will burn quickly in case of open fire. Especially the clothes contaminated with grease may spontaneously ignite in the presence of oxygen.
Nitrogen is a colorless, tasteless and odorless inert gas. It is harmless to human body, but when the nitrogen content in the air increases, it reduces the oxygen content, making it difficult to breathe. In order to avoid the increase of nitrogen content in the air in the workshop, nitrogen separated from the air separation plant shall not be discharged indoors. When overhauling nitrogen charging equipment, vessels and pipelines, air shall be used to replace them, and the operation shall be allowed only after the oxygen content is qualified. During maintenance, the nitrogen valve shall be supervised to prevent personal accidents caused by opening the valve by mistake.
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