Safe Handling of Flammable and Combustible Liquids. Flammable and Combustible Liquids. The determining factor in whether a liquid is flammable or combustible is its flashpoint.
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The determining factor in whether a liquid is flammable or combustible is its flashpoint.
Flashpoint: 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.
Remember, it is the vapors, not the liquid, that Burns!
A chemical’s flashpoint is listed on the MSDS under the Fire and Explosion section.
Flammable Liquid - any liquid having a flashpointbelow 100o F
(37.8o C) or higher, the total of which make up 99 percent or more
of the total volume of the mixture. Flammable liquids shall be
known as Class I liquids. Class I liquids are divided into three
classes as follows:
Class IA - shall include liquids having flashpoints below 73 F (22.8 C)
and having a boiling point below 100 F (37.8 C).
Class IB - shall include liquids having flashpoints below 73 F (22.8 C)
And having a boiling point at or above 100 F (37.8 C).
Class IC - shall include liquids having flashpoints at or above 73 F
(22.8 C) and below 100 F (37.8 C).
Combustible Liquid- any liquid having a flashpoint at or above
100o F (37.8o C). Combustible liquids shall be divided into two
classes as follows:
Class II - shall include those with flashpoints at or above
100 F (37.8 C) and below 140 F (60 C), except any mixture
having components with flashpoints of 200 F (93.3 C) or higher,
the volume of which makes up 99 percent or more of the total
volume of the mixture.
Class III - shall include those with flashpoints at or above
140 F (60 C).
Class III liquids are subdivided into two subclasses:
Class IIIA - shall include those with flashpoints at or above 140 F (60 C) and below 200 F (93.3 C), except any mixture having components with flashpoints of 200 F (93.3 C), or higher, the total volume of which makes up 99 percent or more of the total volume of the mixture.
Class IIIB - shall include those with flashpoints at or above 200 F (93.3 C).
Barsol A-2316 54o F
Acetone Solvent 0o F
Barsol A-2343 56o F
Barsol A-3447 0oF
N-Butanol 36o F
Sec. Butanol 72o F
Glycol Ether 94o F
Enamel Reducer 20o F
Isopropyl Alcohol 45oF
Methanol 45o F
MEK 23o F
Xylene 79o F
Toluene 45o F
Gasoline -50o F
142 Solvent 66/3 610 FFlammable Liquids in the Plant
Explosive limits involve the concentration level of the given chemical in the air.
In popular jargon, a vapor/air mixture below the flammable limit is too lean to burn or explode. A mixture above the upper flammable limits is too rich to burn.
Most flammable liquids are volatile, meaning they evaporate quickly, and can reach a concentration in air that could lead to an explosion.
Exposure Control Measures Include:
liquids and soaked rags.
Grounding: Applying a grounding wire to a container to eliminate a difference in static charge changes the potential between an object and ground.
Bonding: Use of a wire between two drums to eliminate the static charge potential between objects.
Ventilation: Adequate if it is sufficient to prevent the accumulation of significant quantities of vapor-air mixtures in concentrations over ¼ of the Lower Explosive Limit.
Safety Can: An approved red container, of not more than 5 gallons capacity, having a spring-closing lid and spout cover and so designed that it will safely relieve internal pressure when subjected to fire exposure.
Oily Waste Can: A self closing metal container used to store oil soaked rags.
Keep Fire AwayContainer & Portable Tank Storage
Design, Construction and Capacity of Containers
Only approved containers and portable tanks may be used to store
flammable and combustible liquids. Metal containers and portable
tanks meeting the requirements of the Department of Transportation
are deemed acceptable when containing products.
Not more than 60 gallons of Class I and/or Class II liquids, or not
more than 120 gallons of Class III liquids may be stored in an
Liquids located outside of storage cabinets/areas shall not exceed:
25 Gallons of Class IA in containers.
120 Gallons of Class IB, IC or
Class II liquids in containers.
(Mixing flammable liquids can lower their combined flashpoint.)