The concept of "fire hazard class" differs from the "fire hazard category", which combines the characteristics of production. The first concept complements the meaning of the latter, and therefore its classification is carried out separately for each element of the production system, for all its components that can cause and promote the course of a fire.
Instructions
Step 1
Distinguish between fire hazard classes, presented separately by substances, materials, equipment, electrical wiring, structural elements of the building.
Step 2
Remember that all substances are divided into 4 classes.
In the list of class 1 fire hazardous elements, include explosive aerosols with a lower concentration limit corresponding to the real threat of fire or explosion (below 15 g per cubic meter). Such substances are represented by sulfur, rosin, naphthalene, peat dust, mill dust, ebonite dust.
Step 3
In the list of class 2 fire hazardous substances, include explosive aerosols with a lower concentration limit corresponding to the real threat of fire or explosion, ranging from 15 to 65 g per cubic meter. Such substances are represented by lignin, aluminum powder, hay, flour and shale dust.
Step 4
In the list of substances of the 3rd hazard class, include even more flammable substances. These are aerogels with a lower concentration limit corresponding to the real threat of fire or explosion, which is higher than 65 g per cubic meter. The autoignition temperature of aerogels is not more than 250 ° C. Such substances are represented, for example, by elevator, tobacco dust.
Step 5
In the list of class 4 fire hazardous substances, include aerogels with a lower concentration limit exceeding 65 g per cubic meter, with a self-ignition temperature of up to 250 ° C. These are, in particular, zinc dust and sawdust.
Step 6
Attach particular importance in terms of "fire hazard class" to the classification of zones of the enterprise.
Define a fire hazardous area as an area outdoors, indoors, where there is constant or intermittent circulation of flammable materials and substances.
