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    Home > Chemicals Industry > Chemical Technology > Flammable liquid (1)

    Flammable liquid (1)

    • Last Update: 2022-02-06
    • Source: Internet
    • Author: User
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    1.


    (1) Definition

    Flammable liquid refers to a liquid that is volatile and flammable at room temperature.


    (2) Flash point

    The flammable liquid is heated under the specified conditions.


    The result measured with a prescribed closed flash point tester is called closed flash point, also called closed cup flash point: the result measured with a prescribed open flash point tester is called open flash point, also called open cup flash Point


    The flash point is not only the volatility index of flammable liquids, but also the hazard index


    In order to facilitate management, flammable liquids can be divided into the following 3 categories according to their hazardous characteristics:

    (1) a liquid low flash point, flash point <-18 ℃, such as acetone , diethyl ether (flash point -45 deg.


    (2) the flash point of the liquid, -18 ℃ ≤ flash point <23 ℃, such as methanol , benzene (flash point -10 deg.


    (3) high flash point liquid, 23 ℃ ≤ flash point ≤61 ℃, such as chlorobenzene , anisole , butyl alcohol (flash point 35 ℃) and the like


    (3) Boiling point

    Boiling point refers to the temperature at which the gaseous saturated vapor pressure of the liquid is equal to the atmospheric pressure outside the liquid, that is, when the liquid heats up, the vapor pressure increases.


    In most cases, there is a good linear relationship among the molecular weight, flash point, boiling point and vapor pressure of similar organic flammable liquids.


    (4) Spontaneous ignition point

    The self-ignition point refers to the lowest temperature at which combustible substances can spontaneously ignite under specified conditions


    In addition, there is a customary term for "randian" in the industry, but it is of little significance in the practice of risk assessment


    2.


    (1) Highly flammable

    The combustion of a liquid is achieved by the formation of a flammable mixture between its volatilized vapor and air, which reaches a certain concentration and encounters a fire source.


    Table 15-1 Hazard characteristics of commonly used flammable liquids


     

     

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