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100 LL shelf life

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rice737(at)msn.com
Guest

Posted: Tue Feb 10, 2009 4:42 pm Post subject: 100 LL shelf life

To anyone who knows C

  

 I have the opportunity to buy some 100LL at bulk pricing and was wondering if anybody knows how long it will remain usable.  It will be stored in an above ground tank.

  

 Thanks C 

  

 Paul

 RV8 Flying Siren

 135 hours and counting

 

  [quote][b]

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g4mech(at)sbcglobal.net
Guest

Posted: Tue Feb 10, 2009 8:00 pm Post subject: 100 LL shelf life

The octane is a measurement of the resistance to detonating (engine  knocking). High-performance engines typically have higher compression and are  therefore more prone to detonation, so they require higher octane fuel. A  lower-performance engine will not generally perform better with high-octane  fuel, since the compression ratio is fixed by the engine  design.

  

 Over time fuel looses it octane rating (resistance to  detonation). It is generally not good to keep fuel for  more than 3 to 6 months but it depends what you expect out of the  fuel when you actually burn it. Whether you store it above or below is  really insignificant. Some folks try to put octane booster in to over come this  but this is tricky because folks don't really have the means to  control over how much you change the rating, just my 2 cents.

  

 Mike

 RV7 S/N 71306

 550 Hours

 [quote]   ---

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bjudge(at)gmail.com
Guest

Posted: Wed Feb 11, 2009 5:16 am Post subject: 100 LL shelf life

I know an ag pilot that buys 10,000 gal right before Jan 1 every year to beat the tax man.  He stores it above ground and then uses through the year.  According to this doc the shelf life is 1 year: http://amd.nbc.gov/akro/library/opm/AM%20OPM%2006-AR-20.pdf  If you've got a place to store it go for it.  Although with the dismal economy oil will probably stay put for a while.  Bill [quote][b]

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bruce.anthony(at)holidayc
Guest

Posted: Wed Feb 11, 2009 12:04 pm Post subject: 100 LL Shelf Life

You don't say how much you intend to buy, but based on 25 years working in the petroleum industry, I recommend the following:  

An important thing to consider is the loss over time of more volatile fuel components such as butane and pentane.  In older fuel, loss of these components to any extent will adversely change the ignition properties of the fuel.  Poor starts is one big symptom of old fuel (especially in colder climates).  If you intend to keep the fuel for awhile first make sure it's fresh when you buy it and store it in an above ground tank with a floating roof.  Store in a cool area out of the direct sun, if possible.  The floating roof on the AST reduces volatilization of the light components.  Also, if you're buying a large quantity from someone who uses a lot of 100LL anyway, ask them if you can buy a "position" in their tank.  That way you'll be able to take your contracted amount out of a tank that is being turned over on a regular basis.  

In any event, I wouldn't recommend using fuel stored in any container that is open to the atmosphere for longer than a month or so (my opinion, no hard facts).  You could also check with a local FBO or your supplier to see what they recommend. 

  

Bruce Anthony  

RV-9A building     [quote][b]

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Gary.A.Sobek

Joined: 09 Jan 2006
Posts: 217
Location: SoCAL USA

Posted: Wed Feb 11, 2009 4:06 pm Post subject: 100 LL shelf life

Searching the web C it appears that it is good for one (1) year.



Here are links to visit.  If they do not work C Google "100 LL Shelf Life"

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Kellym

Joined: 10 Jan 2006
Posts: 1705
Location: Sun Lakes AZ

Posted: Wed Feb 11, 2009 4:21 pm Post subject: 100 LL Shelf Life

Most of your recommendations sound straight from the bible about mogas.

 100LL has an RVP maximum of 7.0. Evaporation of components is extremely slow. It is blended with inherently stable components such as alkylates. A few folks made out very well draining fuel from stored WWII planes when they were scrapped, with fuel that had sat in the planes for more than a year, probably several years. Unless you are using the fuel in a turbocharged engine, the slight loss of octane is unlikely to have any impact. Likewise, with its low RVP avgas age has virtually nothing to do with starting properties of aircraft engines. Many planes in cold climates sit all winter, and have no problems with the gas in the spring. Evaporation isn't an issue for planes that sit all summer in the Arizona heat.

 Kelly

 A&P/IA

 Bruce Anthony wrote:  	  Quote: 	
		           100 LL Shelf Life    

You don't say how much you intend to buy, but based on 25 years working in the petroleum industry, I recommend the following:   

An important thing to consider is the loss over time of more volatile fuel components such as butane and pentane.  In older fuel, loss of these components to any extent will adversely change the ignition properties of the fuel.  Poor starts is one big symptom of old fuel (especially in colder climates).  If you intend to keep the fuel for awhile first make sure it's fresh when you buy it and store it in an above ground tank with a floating roof.  Store in a cool area out of the direct sun, if possible.  The floating roof on the AST reduces volatilization of the light components.  Also, if you're buying a large quantity from someone who uses a lot of 100LL anyway, ask them if you can buy a "position" in their tank.  That way you'll be able to take your contracted amount out of a tank that is being turned over on a regular basis.   

In any event, I wouldn't recommend using fuel stored in any container that is open to the atmosphere for longer than a month or so (my opinion, no hard facts).  You could also check with a local FBO or your supplier to see what they recommend.   

   

Bruce Anthony   

   RV-9A building       	  Quote: 	
		  



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