What are the protection distances of dangerous goods warehouses A and B respectively?

The protection distance requirements for Class A and B warehouses of dangerous goods are as follows:

A class of dangerous chemicals warehouse shall keep a fire-proof distance of at least 20m, which can be reduced to12m when the warehouse reserves are small. The distance between Class A hazardous chemicals warehouse and important public buildings shall be at least 50m.

Class B dangerous goods warehouse is at least 30 meters away from important public buildings and at least 25 meters away from other civil buildings.

The distance between the fence of Class A and Class B dangerous goods storage area and the buildings in the area shall be at least 5 meters.

Extended data:

Classification mark of Class A dangerous goods:

Flammable and explosive substances

Fire prevention and explosion prevention work has a strong pertinence, and it must be carried out in a targeted manner to achieve results. It is very important to identify which substances are flammable and explosive.

(1) combustible gas. Refers to the gas that will catch fire and explode when exposed to naked flame, heat or oxidant. According to the different lower limit of explosion concentration, it is divided into two grades. The first-class combustible gas is the combustible gas whose lower explosive concentration is lower than 10%. For example, most combustible gases such as hydrogen, methane, ethylene, acetylene, ethylene oxide, vinyl chloride, hydrogen sulfide, water gas and nature.

The lower limit of explosion concentration of secondary combustible gas is equal to or higher than 10%. For example, some combustible gases such as ammonia, carbon monoxide and producer gas. In actual production, storage and use, class I combustible gas is classified as Class A fire hazard, and class II combustible gas is classified as Class B fire hazard.

(2) combustible dust. Any solid substance containing tiny particles will burn and explode when it meets a fire source. This substance is called combustible dust. For example, in the process of treating hemp, tobacco, sugar, grain, sulfur, aluminum and other substances, the dust produced by crushing, grinding, sieving and other operations is much more dangerous than the original substance in terms of its physical and chemical properties, and may explode under certain conditions. There are three conditions for combustible dust explosion: (1) the dust itself is explosive; (2) Dust must be suspended in air and mixed with air to reach the explosion limit; (3) There is enough heat energy to cause dust explosion.

③ Spontaneous combustion substances. Any substance that can generate heat and accumulate heat to reach the self-ignition point and cause combustion without the action of external fire source is called self-ignition substance.

Dangerous goods warehouse is a place where inflammable, explosive, toxic and harmful goods are stored and kept. According to the subordinate relationship and the nature of use, it is divided into two categories: category A is the dangerous goods warehouse of commercial warehousing industry, transportation industry and material management department, and category B is the dangerous goods warehouse for enterprise's own use. Among them, Class A dangerous goods warehouse has large reserves and many varieties, which is dangerous. According to the scale, it can be divided into three categories: large-scale dangerous goods warehouse with an area of over 9000 square meters, medium-sized dangerous goods warehouse with an area of 550 ~ 9000 square meters and small-scale dangerous goods warehouse with an area of less than 550 square meters. According to the structure of dangerous goods warehouse, it can be divided into above-ground dangerous goods warehouse, underground dangerous goods warehouse and semi-underground dangerous goods warehouse.

Baidu Encyclopedia: Dangerous Goods Warehouse