03-12-2008, 11:49 PM | #1 |
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Tips on pumping gas
I just got the following e-mail today and thought it was interesting. I sounds like it makes sense, so I thought I'd share:
TIPS ON PUMPING GAS My line of work is in petroleum for about 31 years now, so here are some tricks to get more of your money's worth for every gallon... Only buy or fill up your car or truck in the early morning when the ground temperature is still cold. Remember that all service stations have their storage tanks buried below ground. The colder the ground the more dense the gasoline, when it gets warmer gasoline expands, so buying in the afternoon or in the evening....your gallon is not exactly a gallon. In the petroleum business, the specific gravity and the temperature of the gasoline, diesel and jet fuel, ethanol and other petroleum products plays an important role. A 1-degree rise in temperature is a big deal for this business. But the service stations do not have temperature compensation at the pumps. When you're filling up do not squeeze the trigger of the nozzle to a fast mode. If you look you will see that the trigger has three (3)stages: low, middle, and high. In slow mode you should be pumping on low speed, thereby minimizing the vapors that are created while you are pumping. All hoses at the pump have a vapor return. If you are pumping on the fast rate, some other liquid that goes to your tank becomes vapor. Those vapors are being sucked up and back into the underground storage tank so you're getting less worth for your money. One of the most important tips is to fill up when your gas tank is HALF FULL or HALF EMPTY. The reason for this is, the more gas you have in your tank the less air occupying its empty space. Gasoline evaporates faster than you can imagine. Gasoline storage tanks have an internal floating roof. This roof serves as zero clearance between the gas and the atmosphere, so it minimizes the evaporation. Unlike service stations, here where I work, every truck that we load is temperature compensated so that every gallon is actually the exact amount. Another reminder, if there is a gasoline truck pumping into the storage tanks when you stop to buy gas, DO NOT fill up--most likely the gasoline is being stirred up as the gas is being delivered, and you might pick up some of the dirt that normally settles on the bottom. Hope this will help you get the most value for your money. Edit: I just checked it out at snopes.com and it says that research is in progress. Last edited by Sterling; 03-13-2008 at 12:03 AM. |
03-13-2008, 12:00 AM | #2 |
IS IT 2009 YET???
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I've seen that Email before, and I'd say its solid info.
How much of a difference would you notice...is hard to say. It might make you feel alittle better when you spending 3.75 a gallon for premium.
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03-13-2008, 06:43 AM | #3 |
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I can verify the effect temperature has on gas comment in the article. Most aircraft (all military) measure the fuel in pounds not gallons. partly, cus it's easier to figure wieght before takoff. But we're talking 4,000 pounds of gas in a military Helo. Fighter jets use 30-60,000 pounds. Cargo aircraft... I have no idea but it's a bunch. So, if we were measureing that in gallons or volume, and we had a 5 degree temp change (very common) That could mean a half an hour miscalculation in flight time or more. When measureing in pounds. Pounds is pounds no matter what the temp is.
And aviation fuel cells are also collapseable to keep the evaporation to a minimum. That's pretty cool, I never though to relate that to my cars...
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03-13-2008, 09:55 AM | #4 | |
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Quote:
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03-13-2008, 11:37 AM | #5 |
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Question....
if the gas storage tank has an internal floating roof, then where do the "returning vapors" go that get pushed back from your gas tank? It's not going to push up that roof, right? Don't ya think it would just escape out of the hose and receiver? |
03-13-2008, 12:43 PM | #6 |
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If i'm not mistaken returned vapors cool down and return to liquid... I think..
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03-13-2008, 03:39 PM | #7 |
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Exactly. The vapor return causes the vapors to be pressurized ,which forces them back into a liquid phase.
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03-13-2008, 05:09 PM | #8 |
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Thats some really useful information.. Thanks alot for posting it, I've never seen it.
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03-14-2008, 12:48 AM | #9 | |
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Quote:
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03-14-2008, 08:30 AM | #10 |
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thanks 4 the info
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03-14-2008, 12:51 PM | #11 |
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I'm no geologist but its my understanding that afer you get below 18 inches, ground temperature is reletivly constant, unless you live in some extreme environment. I'm sure that the storage tanks are deeper that 18 inches. I'll do some research to verify this, but in the mean time if anyone knows more about this, let me know.
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03-14-2008, 12:55 PM | #12 |
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I'm very sure the ground tanks are a lot deeper than 18 inches. From the places I've seen where they've torn up the gound and pulled out the tanks, they were VERY deep in the ground.
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03-14-2008, 01:28 PM | #13 | |
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Quote:
At 6 feet down the temperature of the ground is relatively stable year round. Depending on where you live it can be anywhere from 45F to 70F, but usually doesn't delta more than 5-10%. What does this mean. In short it means pumping gas early because of it being cooler is absolute BS. I know how to work out the math to show much the volume will change over a 10 degree delta, and if you want that I can get it.
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03-14-2008, 01:39 PM | #14 |
I used to be Dragoneye...
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What about the piping, and the hose? Gasoline is rather unstable, and I don't thin it'd take much temp difference to expand enough to make a difference. Flowing through a warm BLACK (absorbing energy > heat from the sun) hose, in the middle of the afternoon is bound to have some effect.
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