A342
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How Long Can You Store Jet Fuel?

Thu Aug 24, 2006 4:50 am

Did a search, didn't find anything.

How long can you store jet fuel before it gets unusable ? Let's assume it is placed in an underground fuel tank, which is in good condition.
Exceptions confirm the rule.
 
SlamClick
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RE: How Long Can You Store Jet Fuel?

Thu Aug 24, 2006 4:56 am

Planning on investing in jet fuel futures?
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A342
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RE: How Long Can You Store Jet Fuel?

Thu Aug 24, 2006 5:05 am

Quoting SlamClick (Reply 1):
Planning on investing in jet fuel futures?

Hehe ! No, but in my private island with an airport. The fuel tank should be big, as the supply ship wouldn't visit that often !  Wink
Exceptions confirm the rule.
 
SlamClick
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RE: How Long Can You Store Jet Fuel?

Thu Aug 24, 2006 5:11 am

Well then ...

I don't know.

I would assume that the compound is pretty stable. Water is a problem, especially in a tank that is drained and refilled regularly. It has to be vented to the atmosphere and the air contains moisture that condenses on interior surfaces, drips into the fuel and sinks to the bottom if it is still or remains suspended it it is being agitated. Rule of thumb used to be that it takes about 45 minutes per foot of product depth to settle out.

There may be some components that would boil off, even at storage temperatures. I'll leave that speculation to someone who actually knows what they are talking about.
Happiness is not seeing another trite Ste. Maarten photo all week long.
 
A342
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RE: How Long Can You Store Jet Fuel?

Thu Aug 24, 2006 5:15 am

Hm. The tank would only rarely be refilled.

But I would use a drying device to take most of the moisture out of the air !
Exceptions confirm the rule.
 
avioniker
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RE: How Long Can You Store Jet Fuel?

Thu Aug 24, 2006 9:37 pm

The other problem you'll have is fungus. It causes the additives to break down not to mention what it does to the aircraft systems.
There are preventatives but they come with their own set of problems.
I suggest you contact the API (American Petrolium Institute) and get your answers directly from the people that know.

 Smile
One may educate the ignorance from the unknowing but stupid is forever. Boswell; ca: 1533
 
474218
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RE: How Long Can You Store Jet Fuel?

Thu Aug 24, 2006 10:38 pm

Quoting Avioniker (Reply 5):
The other problem you'll have is fungus.

The fungus is caused by water in the fuel, not the fuel its self.

The base for fuel was stored in the ground for a few million years and it didn't make it unusable.
 
Slovacek747
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RE: How Long Can You Store Jet Fuel?

Thu Aug 24, 2006 11:27 pm

Will someone just answer the damn question...

Thank you
 
SlamClick
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RE: How Long Can You Store Jet Fuel?

Fri Aug 25, 2006 12:10 am

Quoting Slovacek747 (Reply 7):
Will someone just answer the damn question...

Thank you

Go right ahead!
Happiness is not seeing another trite Ste. Maarten photo all week long.
 
charlienorth
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RE: How Long Can You Store Jet Fuel?

Fri Aug 25, 2006 12:33 am

I've seen it stored indefinitely in a truck,as long as it is sumped daily.
Work hard fly right..don't understand it
 
PPVRA
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RE: How Long Can You Store Jet Fuel?

Fri Aug 25, 2006 12:54 am

What I've heard before regarding fuel, not Av but regual Gas-station gasoline, is that gasoline is organic, and if you keep it in a car tank for extended periods of time without driving, it will cause problems (I think it was ignition problems, not sure). I don't remember what was the cause... fungus, maybe settling, don't know- sorry.

But that's an issue I've seen happenig before and the above is the explanation given.

Hope it helps any. Cheers.
"If goods do not cross borders, soldiers will" - Frederic Bastiat
 
KELPkid
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RE: How Long Can You Store Jet Fuel?

Fri Aug 25, 2006 1:49 am

Quoting PPVRA (Reply 10):
What I've heard before regarding fuel, not Av but regual Gas-station gasoline, is that gasoline is organic, and if you keep it in a car tank for extended periods of time without driving, it will cause problems (I think it was ignition problems, not sure). I don't remember what was the cause... fungus, maybe settling, don't know- sorry.

Gasoline tends to absorb water over time, and the "lighter" hydrocarbons will boil off as well. There are stabilizing additives that you can buy to prevent this. Avgas is less-susceptible to it, as it already has many additives in it to deal with these very problems. I wouldn't go out and add gasoline stabilizer to avgas, though, as it is not FAA-approved (although I see private aircraft owners put all sorts of unapproved crap into their Avgas tanks, not the least of which is Marvel Mystery Oil).

I am running my lawn mower on some ~2 year old gasoline at the moment (I'm almost to the bottom now), and even though I used gasoline stabilizers in it, I'm getting some really smoky starts now Big grin (probably related to the fact that it was winter gas, with ethanol added, which picks up water even easier than non-winterized gas does). Once it's started, though, nothing bothers that little 6.5 HP, one cylinder Briggs & Stratton with magneto ignition  Wink
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redcordes
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RE: How Long Can You Store Jet Fuel?

Fri Aug 25, 2006 7:46 pm

Quoting 474218 (Reply 6):

The fungus is caused by water in the fuel, not the fuel its self.

Yes, and bacteria. Owners and operators of diesel-powered boats know a whole lot about contamination and long-term storage of fuel. It's all about keeping water out of the fuel.
"The only source of knowledge is experience." A. Einstein "Science w/o religion is lame. Religion w/o science is blind."
 
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HAWK21M
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RE: How Long Can You Store Jet Fuel?

Fri Aug 25, 2006 10:54 pm

Not very sure about the Storage life.Would need to check that out.However Refuelling Agencies out here have to maintain a specified standard too.Their QC department is answerable to the Regulatory Agency of the Country concerned.Which specifies certain checks & its intervals to be carried out.
regds
MEL
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411A
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RE: How Long Can You Store Jet Fuel?

Sat Aug 26, 2006 7:25 am

The answer to the original question is...indefinitely, provided the storage facilities are maintained properly.
 
CRJonBeez
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RE: How Long Can You Store Jet Fuel?

Sat Aug 26, 2006 12:54 pm

Quoting 411A (Reply 14):
The answer to the original question is...indefinitely, provided the storage facilities are maintained properly.

yup...

i don't know about all the others, but phillips jet fuel contains a biocide to take care of the bacterial growth in jet fuel

from the delivery truck, it is filtered once at the truck and once at the hose

from the tank, it is filtered at the pipe taking the fuel in, the pipe sending fuel out, again at a larger filter after the piping, then at the hose

to the fuel truck, it is filtered at the attachment point, then in the pipe, and once more at the end of the hoses used for refueling

jet fuel is filtered an incredible number of times, yet all the filtering in the world won't take away all the problems. anti-icing additives are a major issue in GA a/c not equipped with any device to heat jet fuel, such as the smaller citations, the beechjet, and several others
 
twal1011727
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RE: How Long Can You Store Jet Fuel?

Sun Aug 27, 2006 5:19 am

As stated...the major culprit of Jet fuel is moisture...If the tank is near full then condensation is less (as with any type tank.) The FAA (and most airlines)require that a tank be sumped at least every 3 hours after inactivity. This includes filter/coalescer
The filter coalescer contain 3- 5 layers of filter paper, the primary job of the filter/coalescer is water removal. The coalescer has thousands of fiberglass strands that are interwoven over each other. When a water droplet hits the strand, it travel along that strand to a point where another strand touches it and joins with other water droplets. This increases the size of the water droplet to the point where it floats off the strand into the fuel flow. It then hits the water seperator. The water seperator is basically a long metal tube with alot of holes. The tube is covered with a teflon coating. When the water droplet hits the coating it will eventually drop to the bottm of the filter vessel and into the sump drain housing. Then it is sumped out.

As far as I know, Jet fuel does not go "bad" nor varnish up like auto gas does. If the fuel is "dry" then it can be stored indefinitely. It may be a good idea from time to time to recirculate/stir the fuel in the tank/s and filter vessel. This helps take water/impurites, if any are present, to the filter to keep the fuel clean and dry.

Quoting CRJonBeez (Reply 15):
and once more at the end of the hoses used for refueling



The end of the fueling hose contains a wire mesh screen to catch big stuff ( I.E. blown out filters/degraded rubber fuel hoses etc.) It does not have filter elements.


KD
 
MD-90
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RE: How Long Can You Store Jet Fuel?

Sun Aug 27, 2006 9:00 am

I'm assuming that Pri-D can safely be used with Jet-A requiring aircraft, but it's for darn sure that kerosene does not last indefinately.

With Pri-D treatments every 18-24 months, your fuel supply can last a decade, which ought to be plenty.
 
Legs
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RE: How Long Can You Store Jet Fuel?

Sun Aug 27, 2006 3:06 pm

Would adding an inert, moisture free gas, such as nitrogen to the 'headspace' of the tank help with the long term storage by keeping the moisture levels as low as possible? Or would this just cause more problems than it would solve?
 
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HAWK21M
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RE: How Long Can You Store Jet Fuel?

Sun Aug 27, 2006 5:35 pm

Quoting Legs (Reply 18):
Would adding an inert, moisture free gas, such as nitrogen to the 'headspace' of the tank help with the long term storage by keeping the moisture levels as low as possible

That would mean pressurised tanks.Is that feasable for ATF containers.
regds
MEL
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jarheadk5
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RE: How Long Can You Store Jet Fuel?

Thu Aug 31, 2006 2:30 am

Biobor is your friend if you want to store Jet for a long time...

Quoting TWAL1011727 (Reply 16):
It may be a good idea from time to time to recirculate/stir the fuel in the tank/s and filter vessel. This helps take water/impurites, if any are present, to the filter to keep the fuel clean and dry.

This is called "fuel polishing" by the yacht industry. Google that phrase; you'll find all kinds of good info.

Quoting Legs (Reply 18):
Would adding an inert, moisture free gas, such as nitrogen to the 'headspace' of the tank help with the long term storage by keeping the moisture levels as low as possible?

I would think so. Combine that with a tank in good material condition, a good fuel polishing setup, and some Biobor, and you'd probably be good to go for many years...
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JHSfan
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RE: How Long Can You Store Jet Fuel?

Fri Sep 01, 2006 4:38 am

Quoting Legs (Reply 18):
Would adding an inert, moisture free gas, such as nitrogen to the 'headspace' of the tank help with the long term storage by keeping the moisture levels as low as possible? Or would this just cause more problems than it would solve?

A complementary solution to the use of inert gas is having a fuel tank that contracts as the fuel is removed.
A "fuel bladder" like this could be a solution (I'm not 100 % sure on that) as long as the volume of air inside the tank does not increase (too much) as the fuel is drained.

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JHSfan
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