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Gasoline vapour pressure 1
- Thread starter ta5ari
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First, because by definition, the Ried Vapour Pressure stated in literature is ONLY at 100F.
Second, gasoline is a mixture of hydrocarbons, so there is no fixed value of a TRUE VAPOUR PRESSURE (thats the name for a vapour pressure at differnt temperature).
I ran a simulation on a mixture and got the following: For a 10 pis RVP, the true VP was 5.2 psia at 20 C and 33 psia at 80C. This is an example only, you need to do your own bubble point flashes on your composition.
Second, gasoline is a mixture of hydrocarbons, so there is no fixed value of a TRUE VAPOUR PRESSURE (thats the name for a vapour pressure at differnt temperature).
I ran a simulation on a mixture and got the following: For a 10 pis RVP, the true VP was 5.2 psia at 20 C and 33 psia at 80C. This is an example only, you need to do your own bubble point flashes on your composition.
black2003cobra
Automotive
Not sure this is useful to you. From the Taylor brothers' book. Isooctane is on the graph, but not gasoline. I believe vapor pressure of gasoline is varied between summer and winter blends.
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ta5ari:
As noted by dcasto, Reid Vapor Pressures (RVP) are always at 100 deg F. And as noted by dgallup, the RVP of a gasoline varies by season, region, altitude and local regulation.
The U.S. Environmental Protection Agency's publication "AP-42: Compilation of Air Pollution Emission Factors", Chapter 7, Table 7.1-2, publishes the True vapor pressures (in psia) at 40, 50, 60, 70, 80, 90 and 100 deg F for gasolines having Reid Vapor Pressures of 7, 7.8, 8.3, 10, 11.5, 13, 13.5 and 15.
That Table 7.1-2 is at:
If your need for such data is for calculating vapor emissions from gasoline storage tanks, then the EPA also provides a software program called TANKS which can be downloaded at
Milton Beychok
(Visit me at www.air-dispersion.com)
.
As noted by dcasto, Reid Vapor Pressures (RVP) are always at 100 deg F. And as noted by dgallup, the RVP of a gasoline varies by season, region, altitude and local regulation.
The U.S. Environmental Protection Agency's publication "AP-42: Compilation of Air Pollution Emission Factors", Chapter 7, Table 7.1-2, publishes the True vapor pressures (in psia) at 40, 50, 60, 70, 80, 90 and 100 deg F for gasolines having Reid Vapor Pressures of 7, 7.8, 8.3, 10, 11.5, 13, 13.5 and 15.
That Table 7.1-2 is at:
If your need for such data is for calculating vapor emissions from gasoline storage tanks, then the EPA also provides a software program called TANKS which can be downloaded at
Milton Beychok
(Visit me at www.air-dispersion.com)
.
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