South China Laboratory of National Registration Center for Chemicals, MEMNRCC (Shenzhen) Safety Technology Co.,Ltd.
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Based on the fire hazard characteristics of substances, the fire hazard classification principles for production and storage buildings are qualitatively or quantitatively defined, and related industries such as petrochemicals, oil and gas, and pharmaceuticals can further refine them according to actual situations.
1、 Classification of fire hazards in production:
The classification of fire hazards in production generally requires an analysis of whether each link in the entire production process has the potential to cause a fire. The classification of fire hazards in production generally depends on the most dangerous substances, which can be determined by analyzing factors such as the properties of all raw materials used in production, whether changes in operating conditions during production will change the properties of the substances, the properties of all intermediate products produced during production, the properties of the final products and their by-products, and environmental conditions such as natural ventilation, temperature, and humidity during the production process. Of course, it is necessary to simultaneously consider the actual usage or output of production.
The fire hazard of production should be classified according to the properties and quantities of substances used or generated in production, and can be divided into categories A, B, C, D, and E, and should comply with the provisions of Table 3.1.1.
Table 3.1.1 Classification of Fire Hazards in Production
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Classification of fire hazards in production |
The fire hazard characteristics of using or producing the following substances for production |
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nail |
1. Liquids with a flash point less than 28 ℃ 2. Gases with a lower explosive limit of less than 10% 3. Substances that can decompose on their own at room temperature or oxidize in air, leading to rapid spontaneous combustion or explosion 4. Substances that can produce flammable gases and cause combustion or explosion when exposed to water or water vapor in the air at room temperature 5. Strong oxidants that can easily cause combustion or explosion when exposed to acid, heat, impact, friction, catalysis, or flammable inorganic substances such as organic matter or sulfur 6. Substances that can cause combustion or explosion when impacted, rubbed, or in contact with oxidants or organic matter 7. Production where the operating temperature is not less than the self ignition point of the substance itself in a sealed equipment |
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B |
1. Liquids with a flash point of not less than 28 ℃ but less than 60 ℃ 2. Gas with a lower explosive limit of not less than 10% 3. Oxidants that do not belong to Class A 4. Flammable solids that do not belong to Class A 5. Combustion supporting gas 6. Floating dust, fibers, and liquid droplets with a flash point of not less than 60 ℃ that can form explosive mixtures with air |
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C |
1. Liquids with a flash point of not less than 60 ℃ 2. Combustible solids |
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Ding |
1. Processing non combustible materials and producing strong radiation heat, sparks, or flames frequently at high temperatures or in a molten state 2. Various productions that use gases, liquids, or solids as fuel or burn gases or liquids for other purposes 3. Production of difficult to burn substances for use or processing at room temperature |
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Wu |
Production of non combustible materials for use or processing at room temperature |
2、 Classification of fire hazards for stored items:
The fire hazard of stored items should be classified according to factors such as the nature of the stored items and the quantity of combustibles in the stored items. It can be divided into categories A, B, C, D, and E, and should comply with the provisions of Table 3.1.3.
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Fire hazard category for stored items |
Fire hazard characteristics of stored items |
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nail |
1. Liquids with a flash point less than 28 ℃ 2. Solid substances that can produce gases with a lower explosive limit of less than 10% when exposed to water or water vapor in the air 3. At room temperature, it can decompose substances in the air that can cause rapid spontaneous combustion or explosion due to oxidation 4. Substances that can produce flammable gases and cause combustion or explosion when exposed to water or water vapor in the air at room temperature 5. Strong oxidants that can easily cause combustion or explosion when exposed to acid, heat, impact, friction, or flammable inorganic substances such as organic matter or sulfur 6. Substances that can cause combustion or explosion when impacted, rubbed, or in contact with oxidants or organic matter |
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B |
1. Liquids with a flash point of not less than 28 ℃ but less than 60 ℃ 2. Gas with a lower explosive limit of not less than 10% 3. Oxidants that do not belong to Class A 4. Flammable solids that do not belong to Class A 5. Combustion supporting gas 6. Items that can slowly oxidize when in contact with air at room temperature and do not dissipate heat, causing spontaneous combustion |
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C |
1. Liquids with a flash point of not less than 60 ℃ |
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2. Combustible solids |
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Ding |
Difficult to burn items |
|
Wu |
Non combustible material |
