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What technical misconceptions should be noted in explosion-proof certification

SINO Testing Services

| 2022-03-31|Return

stayExplosion proof certificationIn technology, many people are unable to distinguish concepts such as explosion-proof, fireproof, explosive areas, explosive substances, and types of electrical equipment.

1fireproofConfusion 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-proof. Therefore, explosion-proof must clearly define what the object is.

2Explosion caused by chemical reactions refers to the explosive environment that occurs in chemical reaction kettles, reaction towers, and other devices. It refers to the explosion of flammable substances leaked from the devices and pipelines into the atmosphere and mixed with air, 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).

1Fire protection 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)To control the fire, propose building area regulations;

3)To control the impact of fires on surrounding buildings, regulations on the distance between adjacent buildings are proposed;

4)For the convenience of personnel escaping after a fire, it is recommended to provide necessary escape routes in the building;

5)In order to solve the initial fire extinguishing problem, necessary fire extinguishing facilities have been proposed.

2Classification of flammable substances:

1GBJ16- (2001)Annual editionThe 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 point2℃ flammable liquid.Lower explosive limit10%Flammable gases; Spontaneous combustion solids and combustion solids in contact with water.

Bclass:28℃ ≤ Flash point60℃ flammable liquid.Lower explosive limit ≥10%Flammable gas.Flammable solids;

Cclass:Flash point ≥60Flammable liquid at ℃.Combustible solids.

more than28℃ is the hottest monthly average temperature in cities in southern China, which means that Class A flammable liquids can cause flash ignition at room temperature.60At ℃, the flash point of diesel is divided into gasolineflash point-42keroseneflash point40diesel oilflash point>60.

3、 As long as the electrical equipment is explosion-proof, the problem of explosion-proof can be solved.

1. Exsign:It's not an explosion-proof sign, it's in EnglishExplorationIt is a warning sign instead of a simple abbreviation. 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, differentExplosion proof certificationThe protection type is suitable for different explosive hazardous locations.

3All different zone levels in explosive hazardous areas.

Determine based on the release source and on-site ventilation conditions

1Explosive gas environments are divided into0District1District2Divide into three areas.

2Explosive dust environments are divided into20District21District and22Divide into three areas.

4Common types of explosion-proof electrical equipmentSuch as explosion-proof typeNot 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 for mechanical damage protection.

4、 Electrical systems in explosive hazardous areas must meet the overall explosion-proof concept.

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