Question 29 of 30
The flammable limits of an atmosphere are the:
A
Maximum temperatures at which an oil source produces vapors
B
Upper and lower percentage of vapor concentrations in an atmosphere which will burn if an ignition source is present
C
Safe ambient operating thresholds for storage facilities
D
Minimum moisture concentrations needed to halt spontaneous ignition
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Answer & Explanation
The correct answer is Option B: Upper and lower percentage of vapor concentrations in an atmosphere which will burn if an ignition source is present.
Flammable limits define the range of concentrations of a flammable gas or vapor in air that will burn or explode when an ignition source is present. The lower flammable limit (LFL) is the minimum concentration, and the upper flammable limit (UFL) is the maximum concentration.