1 Flammable and Combustible Liquids INSY 3020 Spring 2006
Transcript
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1 Flammable and Combustible Liquids INSY 3020 Spring 2006
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2 Where do you encounter Flammable Liquids Gasoline Car/Truck
BBQ Deodorant Sprays/Perfumes
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3 Flammable and Combustible Liquids 29CFR 1910.106 Based on
National Fire Protection Association-NFPA 30 Code The standard
applies to handling, storage and use of flammable and combustible
liquids with flash point below 200F
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4 Definitions Boiling Point It is the temperature at which the
liquid and vapor (gas) phases of a substance can exist in
equilibrium Temp at which vapor pressure = 1 atm
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5 Definitions Vapor Pressure Partial pressure of the vapors
produced at the surface of a liquid at a given temperature (i.e.
100 F) Remember, its the vapor which burns, not the liquid. How
will you find the vapor pressure of a liquid?
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6 Definitions Vapor Density The weight of a flammable vapor
compared to air. (Air = 1) Vapor with high density are more
dangerous than vapors with low density.
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7 Definitions Relationship between Boiling Point and Vapor
Pressure The boiling point is the temperature at which the vapor
pressure of the liquid equals the external pressure
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8 Definitions Flash Point The minimum temperature at which a
liquid gives off enough vapor within a test vessel in sufficient
concentration to form an ignitable mixture with air near the
surface of the liquid.
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9 How to Determine Flash Point? It is determined by heating the
liquid in test equipment and measuring the temperature at which a
flash will be obtained when a small flame is introduced above the
surface of the liquid.
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10 How will you differentiate between a flammable liquid &
a combustible liquid? Depends on flash point and vapor
pressure/boiling point Both are properties of materials
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11 Classes of Flammable and Combustible Liquids 200 140 100 73
IIIA II IC IAIB 100 COMBUSTIBLE (Flash Point >100 F) FLAMMABLE
(Flash Point < 100 F) Boiling Point (F) Flashpoint (F o )
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12 Flammable and Combustible Liquids Flammable Liquids Any
liquid having a flashpoint below 100 o F (37.8 o C) or lower. NFPA
Classes IA, IB, & IC Combustible Liquids Any liquid having a
flashpoint at or above 100 o F (37.8 o C). NFPA Classes II &
IIIA & B
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13 Flammable Liquid Classification Flammable liquids are also
called as Class I liquids Class IA - flashpoints