2007-05-01 06:58:03 · 10 answers · asked by Chris 5 in Cars & Transportation ➔ Aircraft
Fuel System Icing Inhibitors (Anti-icing additives) reduce the freezing point of water precipitated from jet fuels due to cooling at high altitudes and prevent the formation of ice crystals which restrict the flow of fuel to the engine. This type of additive does not affect the freezing point of the fuel itself. Anti-icing additives can also provide some protection against microbiological growth in jet fuel.
100ll freezes at -75c
Jet A-1 has a lower maximum freezing point than Jet A (Jet A: –40ºC, Jet A-1: –47ºC).
Jet B is a distillate covering the naphtha and kerosene fractions. It can be used as an alternative to Jet A-1 but because it is more difficult to handle (higher flammability), there is only significant demand in very cold climates where its better cold weather performance is important.
The freezing point for Jet B is -51 c.
JP-4 is the military equivalent of Jet B with the addition of corrosion inhibitor and anti-icing additives;
JP-5 is a high flash point kerosene
Freezing point, -46°C
JP-8 is the military equivalent of Jet A-1 with the addition of corrosion inhibitor and anti-icing additives;
2007-05-01 17:36:23 · answer #1 · answered by cherokeeflyer 6 · 0⤊ 0⤋
Daniel is correct about the fuel icing inhibitors. Where I work, this is already premixed into the fuel. Some FBO's have an aerosol can of the inhibitor that can be mixed while fueling over the wing (small aircraft). (Babz) A jet engine has two ways of warming the fuel before the FCU pumps it to the injectors. First, there is the fuel/oil cooler. Hot oil passes via tubing through chamber in the fuel system. The oil is cooled and the fuel warmed in the heat exchange. If more fuel heating is required, The fuel passes via tubing through a chamber in which engine bleed air (hot from compression) passes in order to warm the fuel even more.
2007-05-01 10:03:48 · answer #2 · answered by mojonah 3 · 1⤊ 0⤋
While water freezes at 0 degrees C, airplane and jet fuel, just like alcohol, freezes at a much lower temperature.
2007-05-01 07:02:52 · answer #3 · answered by lunatic 7 · 5⤊ 0⤋
The freezing point for jet fuel is -40 to -47 degrees Celsius (depending on whether Jet A or Jet B is used), which is VERY cold.
Fuel system icing inhibitor (FSII) is also used to ensure that it does not freeze.
2007-05-01 07:03:57 · answer #4 · answered by Anonymous · 7⤊ 0⤋
additives added to the fuel and some fuels like jp-4 or 5 are designed for aircraft that fly higher than a kite
2007-05-01 07:17:21 · answer #5 · answered by accomacgeo 4 · 0⤊ 1⤋
Oil used to be more of a worry than fuel, but with synthetics, not so much anymore.
2007-05-01 08:15:31 · answer #6 · answered by Anonymous · 0⤊ 1⤋
It is a different composition than in automobiles, made to burn slower and withstand colder tempuratures at high altitudes. The tempurature can get to -50 or lower, so it is formulated to not freeze. If you are looking for exactly what they put in it to make it resistant to freezing, you should do a little internet research.
2007-05-01 07:02:30 · answer #7 · answered by 11001001 3 · 2⤊ 3⤋
petrol freezes at minus 160 degrees
diesel waxes at 0...unless it has additives, nowadays its safe down to minus 30...
and veggie oil turns into treacle at 0, and will not pass thru the injectors... to do that it has to be around 90f...
2007-05-01 07:07:33 · answer #8 · answered by Anonymous · 0⤊ 1⤋
Same reason why you can put vodka in your freezer. Why aren't they using potatos to fuel cars?
2007-05-01 07:04:10 · answer #9 · answered by nightdogg 4 · 0⤊ 1⤋
I'm not 100% but I imagine it is due to it being blasted through heating jets that make sure it in liquid before it enters the engine.
I know this is what happens on veggie run engines so ... maybe!!
2007-05-01 07:02:02 · answer #10 · answered by Anonymous · 0⤊ 5⤋