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asarangan(at)gmail.com
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 Posted: Wed Jan 01, 2014 2:30 pm Post subject: Vapor pressure of gasoline? |
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I was filling my tank with gas (regular E10 mogas) to check it prior
to bonding it into the module, and noticed something strange that I
could not explain. I have the outlets sealed off. I poured 10 gallons
in and closed off the inlet and the vent hole with rubber caps. After
5 minutes, when I open one of the caps, I can hear a pop, and a puff
of gasoline vapor. I close it off, wait another 5 minutes, and it does
the same thing. I put a tiny hole on the rubber cap to prevent
pressurization, but I am dumbfounded by this observation. Surely, the
vapor pressure of gasoline cannot be higher than atmospheric pressure?
Both the filled jerry cans and the tank have been in the same location
for a couple of weeks, so they should be at the same temperature. What
could be causing this?
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rlborger(at)mac.com
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| Posted: Wed Jan 01, 2014 2:55 pm Post subject: Vapor pressure of gasoline? |
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Andrew,
Gasoline, MoGas, Petrol, is a very complex mixture of hydrocarbons (primarily C4-C12) with quite a number of chemical additives to provide stability, cleaning, anti-knock, etc. You might want to read the Wikipedia page on Gasoline for details. You will probably find your answer there.
Best regards,
Robert Borger
President, Geowhiziks & Doodlebugging, Inc.
AAPG Certified Petroleum Geophysicist #101
3705 Lynchburg Dr.
Corinth, TX 76208-5331
Cel: 817-992-1117
rlborger(at)mac.com
On Jan 1, 2014, at 4:29 PM, Andrew Sarangan <asarangan(at)gmail.com> wrote:
I was filling my tank with gas (regular E10 mogas) to check it prior
to bonding it into the module, and noticed something strange that I
could not explain. I have the outlets sealed off. I poured 10 gallons
in and closed off the inlet and the vent hole with rubber caps. After
5 minutes, when I open one of the caps, I can hear a pop, and a puff
of gasoline vapor. I close it off, wait another 5 minutes, and it does
the same thing. I put a tiny hole on the rubber cap to prevent
pressurization, but I am dumbfounded by this observation. Surely, the
vapor pressure of gasoline cannot be higher than atmospheric pressure?
Both the filled jerry cans and the tank have been in the same location
for a couple of weeks, so they should be at the same temperature. What
could be causing this?
| | - The Matronics Europa-List Email Forum - | | | Use the List Feature Navigator to browse the many List utilities available such as the Email Subscriptions page, Archive Search & Download, 7-Day Browse, Chat, FAQ, Photoshare, and much more:
http://www.matronics.com/Navigator?Europa-List |
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asarangan(at)gmail.com
Guest
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| Posted: Wed Jan 01, 2014 3:32 pm Post subject: Vapor pressure of gasoline? |
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Bob
Thanks for that suggestion. I did some searching, and think I've found
the answer. It seems winter fuels use more butane, which has a vapor
pressure of 30 psi at 20C (twice atmospheric). That is quite a bit of
pressure! So the butane boiling off must be contributing to the
pressurization of my tank.
At first I suspected ethanol, but its vapor pressure is only 1psi.
On Wed, Jan 1, 2014 at 5:54 PM, Robert Borger <rlborger(at)mac.com> wrote:
| Quote: |
Andrew,
Gasoline, MoGas, Petrol, is a very complex mixture of hydrocarbons (primarily C4-C12) with quite a number of chemical additives to provide stability, cleaning, anti-knock, etc. You might want to read the Wikipedia page on Gasoline for details. You will probably find your answer there.
Best regards,
Robert Borger
President, Geowhiziks & Doodlebugging, Inc.
AAPG Certified Petroleum Geophysicist #101
3705 Lynchburg Dr.
Corinth, TX 76208-5331
Cel: 817-992-1117
rlborger(at)mac.com
On Jan 1, 2014, at 4:29 PM, Andrew Sarangan <asarangan(at)gmail.com> wrote:
I was filling my tank with gas (regular E10 mogas) to check it prior
to bonding it into the module, and noticed something strange that I
could not explain. I have the outlets sealed off. I poured 10 gallons
in and closed off the inlet and the vent hole with rubber caps. After
5 minutes, when I open one of the caps, I can hear a pop, and a puff
of gasoline vapor. I close it off, wait another 5 minutes, and it does
the same thing. I put a tiny hole on the rubber cap to prevent
pressurization, but I am dumbfounded by this observation. Surely, the
vapor pressure of gasoline cannot be higher than atmospheric pressure?
Both the filled jerry cans and the tank have been in the same location
for a couple of weeks, so they should be at the same temperature. What
could be causing this?
|
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http://www.matronics.com/Navigator?Europa-List |
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