stayExplosion proof certificationIn technology, many people are unable to distinguish concepts such as explosion prevention, fire prevention, explosive areas, explosive substances, and types of electrical equipment.
1fire prevention、Confusion of explosion-proof concepts.
1There are many types of explosions, which are basically divided into three categories: physical explosions, chemical explosions, and nuclear explosions. To prevent explosions, there are corresponding measures called explosion prevention. Therefore, explosion prevention must specify what the target is.
2The explosion caused by chemical reactions refers to the explosive environment that occurs in chemical reaction vessels, reaction towers, and other devices. It refers to the explosion of flammable substances leaked into the atmosphere and mixed with air in the devices and pipelines, forming an explosive mixture. It is an explosion in the environmental space.
3The explosion-proof method is completely different. The former strictly controls process parameters (temperature, pressure, flow rate) and adds safety valves, rupture discs, etc. to the equipment, while the latter uses explosion-proof electrical equipment.
2、 The difference between fire prevention (flammable substances) and explosion prevention (explosive environments).
1Firefighting has a dual significance. One is to take measures to prevent fires. In addition, if a fire occurs, fire extinguishing measures should be taken and the following main fire prevention requirements should be proposed:
（1）Provide regulations for different fire resistance levels of buildings based on the different levels of flammable substances;
（2）Propose building area regulations to control the spread of fire;
（3）To control the impact of fire on surrounding buildings, propose spacing regulations with adjacent buildings;
（4）To facilitate the escape of personnel after a fire, it is recommended to provide necessary escape routes for buildings;
（5）In order to solve the problem of extinguishing initial fires, necessary firefighting facilities have been proposed.
2Classification of flammable substances:
（1）GBJ16-(2001Year Edition)The Code for Fire Protection Design of Buildings divides the fire risk of items into five categories, and flammable substances are classified intoA.B.CThe first three categories：
AClass:flash point2Flammable liquid at ℃.Lower explosive limit10%Flammable gases; Spontaneous combustion solids and water burning solids.
Bclass：28℃ ≤ flash point60Flammable liquid at ℃.Explosion lower limit ≥10%Flammable gas.Flammable solids;
Cclass：Flash point ≥60Flammable liquid at ℃.Flammable solid.
above28℃ is the hottest monthly average temperature in southern cities of China, which means that Class A flammable liquids can cause flash ignition at room temperature.60At ℃, the flash point of diesel is divided into gasoline(flash point-42℃).kerosene(flash point40℃).diesel oil(flash point>60℃).
3、 As long as the electrical equipment is explosion-proof, the explosion-proof problem can be solved.
1 Exsign：It's not an explosion-proof sign, it's in EnglishExplosionThe abbreviation is a warning sign. It includes ① quality ② installation ③ use ④ maintenance ⑤ maintenance.
2There are various types of explosion-proof protection for explosion-proof electrical equipment, and according to different explosion-proof principles, there are differentExplosion proof certificationThe protection type is applicable to different explosive hazardous areas.
3All different levels of explosive hazardous areas.
Determine based on the release source and on-site ventilation conditions
（1）Explosive gas environment is divided into0District1District2There are three areas in the district.
（2）Explosive dust environment is divided into20District21District and22There are three areas in the district.
4Common types of explosion-proof electrical equipment(Like explosion-proof type)Not sealed.
5In China's petrochemical industry, on-site electrical wiring cables or wires are protected by steel pipes. Steel pipes are not explosion-proof steel pipes, they are only used for mechanical damage protection.
4、 Electrical equipment in explosive hazardous areas must meet the overall explosion-proof concept.
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