Fire insurance and storage of the most flammable s

2022-08-09
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Fire insurance and storage and transportation requirements for inflammable solids, spontaneous combustion articles and inflammable articles in wet conditions

solid substances with low ignition point, which will cause strong and rapid combustion and may emit toxic smoke or toxic gases after encountering open fire, heating, impact, friction or contact with some articles (such as oxidants) are called inflammable solids. These substances are mainly some chemical raw materials and their products

1. Classification

according to the level of ignition point and flammability, the simply supported beam impact tester is used to measure the impact toughness of non-metallic materials such as hard plastics, fiber reinforced composites, nylon, glass fiber reinforced plastics, ceramics, cast stone, plastic electrical insulation materials, etc. combustible solids can be divided into two levels:

(1) class I combustible solids

have low ignition point and spontaneous combustion point, easy to burn and explode, and fast combustion speed, The products of combustion are highly toxic. According to their chemical composition, they can be roughly divided into:

red phosphorus and phosphorus containing compounds, such as red phosphorus, phosphorus trisulfide (TETRA) and so on

nitro compounds, such as dinitro naphthalene, foaming agent h, etc. when such nitro compounds are burned, they may explode during the rainy season. Pay more attention to wiping

others, such as nitrocellulose with nitrogen content below 12.5%

(2) class II flammable solid

the combustibility of such substances is worse than that of class I flammable solid, the combustion speed is slower, and some combustion products are less toxic. According to their chemical composition, they can be roughly divided into:

nitro compounds, such as dinitropropane, products containing nitrocellulose, etc

flammable metal powder, such as aluminum powder, can also form explosive mixture with air when the powder is flying

naphthalene and its derivatives, such as naphthalene, methylnaphthalene, etc. They are easy to sublimate, and their surface vapor concentration is large, so they are easy to catch fire

others, such as sulfur, raw rosin, polymerized formaldehyde, etc., are irritating or toxic except for being easy to burn

2. Fire hazard characteristics

(1) the main characteristics of flammable solids are that they are easy to be oxidized, easy to decompose or sublimate when heated, and often cause strong and continuous combustion in case of open fire. Due to the different chemical composition and structure, the combustion phenomenon is also different. For example, some items sublimate rapidly after being heated, and the steam on the surface burns immediately in case of open fire, spark or high temperature, such as sulfur, naphthalene, camphor, etc. Some items decompose rapidly after being heated to produce combustible gases, which will ignite and burn when exposed to open fire or high temperature, such as foaming agent H (pore forming agent h). Some items, such as various metal powders and red phosphorus, burn directly with oxidation instead of steam after heating

(2) flammable solids come into contact with oxidants, and the energy used accounts for about 12% of the total energy consumption of the national economy. The reaction is intense and combustion and explosion occur. For example, red phosphorus in contact with potassium chlorate, sulfur powder in contact with potassium chlorate or sodium peroxide are prone to immediate combustion and explosion

(3) flammable solids are also sensitive to friction, impact and vibration, except that heat sources such as kindling can cause combustion. For example, red phosphorus, flash powder, etc. are not only easy to burn violently in combination with pharmaceutical preparation research and development and high-quality contract manufacturing in case of fire and high temperature, but also can ignite and burn, or even explode, under friction, vibration, impact, etc

(4) some flammable solids react violently with acids (especially oxidizing acids), which will cause combustion and explosion. For example, foaming agent h contacts with acid or acid mist and ignites rapidly; Naphthalene will react violently with concentrated nitric acid (especially fuming nitric acid) and explode

(5) many flammable solids are toxic, or combustion products are toxic or corrosive. For example, nitro compounds such as dinitrobenzene and dinitrophenol, sulfur, phosphorus trisulfide, etc

3. Storage and transportation

(1) storage. See relevant contents in warehouse fire prevention for details

(2) transportation. When transporting such goods, the loading position should be far away from the crew room, engine room, power supply, fire source, heat source and other parts, and the ventilator should be equipped with a fire star device

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