How to define a room category
Assign a category A room with an increased fire and explosion hazard if there are flammable liquids or combustible gases with a flashpoint of up to 28 ° C. Moreover, their number is sufficient for the formation of explosive vapor-gas mixtures, which, when ignited, will create an excess explosion pressure in the room of more than 5 kPa. Also in category A, place the room in which materials and substances are stored that, when interacting with oxygen, water or other substances in the room, explode or begin to burn, creating an excess explosion pressure of up to 5 kPa.
Assign to a room a category B with an explosive hazard, if there are fibers, combustible dusts or flammable liquids with a flash point of up to 28 ° C. Moreover, their number is sufficient for the formation of vapor-air or dust-air mixtures, which, when ignited, will create an excess explosion pressure in the room of more than 5 kPa.
Assign the room category B1-B4 with fire hazard if it contains slow-burning and flammable liquids, slow-burning and solid combustible materials and substances, as well as materials and substances capable of burning when interacting with water, oxygen or other substances in the room.
Assign to the premises a category G with moderate fire hazard, if it is used for industrial needs, during which materials are processed in hot, hot or molten form. In this process, the process occurs with the release of sparks, flame or radiant heat.
Assign a category D to a room with reduced fire hazard if materials and non-combustible substances are stored in it in a cold state.
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