Nitrogen in Common Color Signs of Gas Cylinders in China

In the common color labels of gas cylinders in China, the cylinder of nitrogen is black and the label is yellow. The relevant information is as follows:

1, the oxygen cylinder is sky blue and the font is black; The nitrogen cylinder is black and the font is yellow; The compressed air bottle is black and the font is white; Chlorine bottle grass green, white font; The hydrogen bottle is vertical dark green with red font; The ammonia bottle is light yellow and the font is black; Liquefied petroleum gas bottle is gray and the font is red; Acetylene bottle is white and the font is red.

2. The storage mode of gas varies according to its nature. Generally speaking, there are several ways of gas storage: pressure tank storage, high-pressure low-temperature liquefaction (solidification), medium storage (slow release through chemical reaction when used) and so on. For flammable and explosive gases such as natural gas and hydrogen, there are also regulations on their storage methods.

3. Natural gas should be stored in outdoor places with sunshade awnings or special warehouses, which should comply with the relevant provisions of the Code for Fire Protection Design of Buildings; Storage places should be ventilated and dry to prevent rain (snow, rain, water immersion, avoid direct sunlight). Open flame and other heat sources are strictly prohibited, and there shall be no trench, back trench and bottom vent, and no pipeline shall pass through.

4, storage of flammable and explosive gas cylinders warehouse lighting equipment must be explosion-proof, electrical switches and fuses should be set outside the warehouse, and lightning protection devices should be set at the same time; The storage period of easily polymerizable gas cylinders shall be specified.

Matters needing attention when using nitrogen gas

1. Nitrogen is a colorless, odorless and nontoxic gas, but it can cause suffocation and poisoning to human body at a certain concentration. Therefore, when using nitrogen, attention should be paid to maintaining ventilation to avoid inhaling excessive nitrogen.

2. Nitrogen has good stability and is not easy to react with other substances. However, under the conditions of high temperature, high pressure and high energy, nitrogen can still react chemically. Therefore, when using nitrogen, care should be taken not to mix it with other substances.

3. The density of nitrogen is smaller than that of air, and it is easy to rise. Therefore, when nitrogen is used, electrostatic charge should be avoided as far as possible to prevent fire and explosion accidents caused by electrostatic charge. When doing experiments with nitrogen, we should pay attention to the correct operation. For example, in the liquid level drop experiment, attention should be paid to controlling the liquid level height; In combustion experiment, attention should be paid to controlling the size of fire source.