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Tractor Talk Discussion Forum

Does gas evaporate from a bulk tank?

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Lester in Ohio

04-12-2006 18:41:04




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Been wondering this for years...when I fill up my 300 gallon fuel tank with gas....how much do I lose in the summer from evaporation? It will take me 4 months to use 300 gallons. It has a 2-3 inch opening where it is filled and a cap goes over that, also has an electric pump. I wonder about the gas left in the hose...it is a 12 foot hose. Is it worth it for me to fill it or just go to town for gas now and then?

Thanks, in advance!

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Steve Crum

04-13-2006 09:09:36




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 Re: Does gas evaporate from a bulk tank? in reply to Lester in Ohio, 04-12-2006 18:41:04  
A 16 year old kid with a car around there anywhere?



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JMS/MN

04-13-2006 08:39:56




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 Re: Does gas evaporate from a bulk tank? in reply to Lester in Ohio, 04-12-2006 18:41:04  
Most definately does. Can reduce evaporation by using a vented cap, painting the tank white, but best thing is to cover the tank. Years ago I bought two 1000 gallon tanks, for gas and diesel. Built an open front shed, facing north, monoslope roof- but did not seal up the eave at the lower end. Fumes cannot accumulate since normal breezes can blow through. Sun never hits the tanks.



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Leroy

04-13-2006 06:50:17




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 Re: Does gas evaporate from a bulk tank? in reply to Lester in Ohio, 04-12-2006 18:41:04  
Also anouther Lester in Ohio. and yes you will loose fuel and a pressure cap will help but it also has to have a pressure relief valve in it to keep tank from blowing up and if it releases then it will release all that vaporised gas into the air at once and be a fire explosion hazard



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dej(JED)

04-13-2006 05:55:11




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 Re: Does gas evaporate from a bulk tank? in reply to Lester in Ohio, 04-12-2006 18:41:04  
Gasoline begins boiling around 25 degrees F. Therefore it will evaporate. Butane in gasoline creates most of the vapor pressure and it evaporates at 33 degrees F. All gasolines aren't the same , but if you have a tank exposed to sun and it is vented, you could lose 10% if the temperature gets up into the 90 degree range.
You can install a presure relief valve in teh vent and add a sealing fill cap. This would cut loss somewhat.

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Nolan

04-13-2006 05:04:54




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 Re: Does gas evaporate from a bulk tank? in reply to Lester in Ohio, 04-12-2006 18:41:04  
If you want to go buck wild and really figure out how much gasoline you're losing, go to the link and get the EPA model used to calculate gas tank emissions. It's a free download, and pretty easy to run.



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MarkB_MI

04-13-2006 03:40:12




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 Re: Does gas evaporate from a bulk tank? in reply to Lester in Ohio, 04-12-2006 18:41:04  
Fuel will always evaporate if it's not under pressure. And it evaporates much faster in warm weather, because vapor pressure increases with temperature. I'll bet you lose several gallons over the summer.



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Dean Barker

04-12-2006 20:32:12




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 Re: Does gas evaporate from a bulk tank? in reply to Lester in Ohio, 04-12-2006 18:41:04  
A pressure cap is supposed to cut the evaporation loss to next to nothing. Don't know if this is true or not.



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Larry NE IL

04-12-2006 20:22:53




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 Re: Does gas evaporate from a bulk tank? in reply to Lester in Ohio, 04-12-2006 18:41:04  
You bet you'll lose some gas. The oil companys changed over to bottom loaders at their terminals. one reason was for saftey, the other is to reclaim many gallons of gas from the fumes in the tanker trucks. Those fumes are sent thru a reclaimer then pumped into the reg. tanks. The tops on the huge storage tanks are floaters. They float on the product. best way to avoid evaporation.



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John (C-IL)

04-12-2006 19:28:01




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 Re: Does gas evaporate from a bulk tank? in reply to Lester in Ohio, 04-12-2006 18:41:04  
Like said before, there are a lot of variables, but the loses can be pretty significant. Maybe 10% over the course of a summer, higher if you don't have a pressure cap and a good padlock.

It costs almost 25 cents extra per gallon to get gasoline delivered to the farm so I go to town and buy mine.



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NEsota

04-12-2006 19:13:00




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 Re: Does gas evaporate from a bulk tank? in reply to Lester in Ohio, 04-12-2006 18:41:04  
There are of coarse many variables; shape of tank, color, in sun shade or buried underground, temperature, humidity etc. Though it can be questioned I was told that it could be one percent per day. You might be surprised if you experimented by replicating the your storage tank condition with a few gallons in a smaller measured quantity left out for a time.



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msb

04-12-2006 18:50:15




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 Re: Does gas evaporate from a bulk tank? in reply to Lester in Ohio, 04-12-2006 18:41:04  
I would keep the tank for the peace of mind it will give.Someday there could be a shortage of gasoline again.Either paint the top of the tank white or better yet,construct a heat shield out of sheet metal roofing and mount it a couple or three inches above the tank.That will give a chimney effect and keep the gasoline evaporation to a minimum.



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