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#1
05-30-2008, 02:18 PM
 Unregistered Guest Posts: n/a
pounds of jet fuel to gallons and/or liters

Fuel is purchased in several method but most jets use pounds of fuel that must be converted to gallons for the US and liters for other international destinations .
#2
05-30-2008, 05:07 PM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 8,700 Rep Power: 17
Re: pounds of jet fuel to gallons and/or liters

Are you looking for a density?
Wikipedia http://en.wikipedia.org/wiki/Jet_fuel says 0.8075 kg/L
This source http://www.experimentalaircraft.info...ion-fuel-1.php says 0.81 kg/L or 6.76 lb/US gallon, or API density 44.3°.

But density varies lot to lot and refinery to refinery. In critical circumstances, it should be measured for the specific lot, and temperature corrected if not at 60 °F.

Edit: To emphasize the need for density measurement on each lot of fuel. I happened across the spec sheet for Conoco Jet-A fuel. The allowable density range is 775 to 846 kg/m³, which is a greater range than I expected. In a practical sense, I don't know if it ever gets to the edges of the spec, but it certainly "can" and still be in spec.

Last edited by JohnS; 05-31-2008 at 07:20 AM.
#3
08-18-2009, 02:08 PM
 Steve Friend Guest Posts: n/a
Re: pounds of jet fuel to gallons and/or liters

So, if I was testing with aviation fuel and needed to go from GPM to lbs/min, I would take the GPM flow and multiply it by 6.76 and would get lbs/min?

What about using a referee fluid like PD680?
#4
08-18-2009, 02:30 PM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 8,700 Rep Power: 17
Re: pounds of jet fuel to gallons and/or liters

Quote:
 Originally Posted by Steve Friend So, if I was testing with aviation fuel and needed to go from GPM to lbs/min, I would take the GPM flow and multiply it by 6.76 and would get lbs/min? What about using a referee fluid like PD680?
Yes, but recognize you are using a "typical" value of density. The density of jet fuel can vary lot to lot.

Edit: The density also varies with temperature of the fuel. If not measured at the standard temperature of 60 °F, you probably need to temperature correct the density as well.

Last edited by JohnS; 08-18-2009 at 02:58 PM.
#5
06-11-2010, 01:55 PM
 Teresa Guest Posts: n/a
Re: pounds of jet fuel to gallons and/or liters

I want to convert 320kg of jet fuel into minutes of fuel. The helicopter can travel two hrs on 350? (a full tank)...
#6
06-12-2010, 03:08 AM
 JohnS Double Ultimate Supreme Member Join Date: Dec 2007 Location: SE Michigan, USA Posts: 8,700 Rep Power: 17
Re: pounds of jet fuel to gallons and/or liters

Quote:
 Originally Posted by Teresa I want to convert 320kg of jet fuel into minutes of fuel. The helicopter can travel two hrs on 350? (a full tank)...
Is the 350 also kilograms? Assuming so, 2 h = 120 min, so
320 kg x 120 min/350 kg = approx 110 min

The above is an approximation. The actual fuel burn rate will decrease slightly as it becomes lighter from burning off fuel load.
#7
11-16-2011, 08:38 AM
 Unregistered Guest Posts: n/a
Re: pounds of jet fuel to gallons and/or liters

How to conversion pounds to liters.

Where
D = Relative density of Jet fuel

V = Volume per liter

P = Weight per pound

So... V = D * P
#8
11-16-2011, 12:48 PM
 Mrs X can't count, can't spell! Join Date: Feb 2006 Location: New Zealand Posts: 2,288 Rep Power: 11
Re: pounds of jet fuel to gallons and/or liters

Quote:
 Originally Posted by Unregistered How to conversion pounds to liters. Where D = Relative density of Jet fuel V = Volume per liter P = Weight per pound So... V = D * P
Not quite correct, you left out one step, you have to convert pounds to kilograms, so multiply by 0.4536. Also, to find volume from weight, you have to divide by the density.

V = D x 0.4536/P

Last edited by Mrs X; 11-16-2011 at 01:06 PM.

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