The vapor explosive range of gasoline by volume is 1.0% to 6.0% in air. If a gasoline tank is sampled with an explosimeter, and the reading obtained is 30% L.E.L., the vapor concentration at the sample point is __________.
ā¢ Lower Explosive Limit (L.E.L.) definition and what 1.0% means in this problem ā¢ How to convert a percentage of L.E.L. reading into an actual vapor percentage by volume ā¢ Relationship between the given explosive range (1.0% to 6.0%) and what the L.E.L. corresponds to
ā¢ If 1.0% by volume is defined as 100% L.E.L., what would 10% L.E.L. be in % by volume? Then scale that idea to 30% L.E.L. ā¢ Think about whether 30% of the lower limit should be a value less than 1.0%, equal to 1.0%, or greater than 1.0% by volume. ā¢ Check that your final volume percent makes sense compared to both the L.E.L. (1.0%) and the U.E.L. (6.0%).
ā¢ Confirm that L.E.L. = 1.0% by volume for gasoline in this question. ā¢ Be sure you are taking 30% of the L.E.L. value, not 30% of the entire 1.0ā6.0% range. ā¢ After calculating, verify your answer is less than 1.0% by volume because the reading is below 100% L.E.L.
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