1. The basic principle of explosion protection
○ 1 Explosion is when matter changes from one state, through physical or chemical changes, to another state suddenly, and releases huge energy. The energy released at a rapid speed will cause the surrounding objects to be violently impacted and destroyed.
The concept of explosion:
○ 21) Explosive substances: substances that can react with oxygen (air), including gases, liquids and solids. (Gas: hydrogen, acetylene, methane, etc.; liquid: alcohol, gasoline; solid: dust, fiber dust, etc.) Three conditions must be met for an explosion:
2) Oxygen: Air.
3) Ignition source: including open flame, electrical spark, mechanical spark, electrostatic spark, high temperature, chemical reaction, light energy, etc.
2. Why explosion-proof: Explosive substances: Many production sites will produce some flammable substances. About two-thirds of the underground coal mines have explosive substances; in the chemical industry, more than 80% of the production workshops have explosive substances.
Oxygen: Oxygen in the air is ubiquitous.
Ignite source:
In the production process, a large number of electrical instruments are used, and various frictional sparks, mechanical wear sparks, electrostatic sparks, and high temperatures are inevitable, especially when the instruments and electrical failures occur. Objectively, many industrial sites meet the explosion conditions. When the mixed concentration of explosive substances and oxygen is within the explosion limit, an explosion will occur if there is an explosion source. Therefore, it is necessary to take explosion-proof.
What is the difference between ExdⅡB T4 and ExdⅡC T4 in the explosion-proof grade label
The difference between Ex(ia)ⅡC T4 and ExdⅡB T4 This is naturally the higher level of IIC.
Ex-----explosion-proof English abbreviation,
Explosion-proof mark d------explosion-proof form, "d" refers to explosion-proof type, which can be installed in zone 1-2, ia-level intrinsically safe explosion-proof method, can be installed in zone 0-2 IIC----explosion-proof grade division , mainly divided into Class I (mining) and Class II (factory). Class II is further divided into: IIA, IIB, IIC
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