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Flypuppy
2nd Jul 2001, 05:37
Can anyone fill me in on what this is and how widespread it's use is.

Thanks for any answers.

Zeke
2nd Jul 2001, 06:24
JP-8 is like Jet A1 with a full additive package (Icing Bio etc). I was of the understanding that the USAF was to phased out JP-8 last year.

from http://www.adtdl.army.mil/cgi-bin/atdl.dll/fm/10-67-2/ch2.htm

JP-8 is a kerosene base aviation turbine fuel procured under MIL-T-83133. Development of JP-8 is a result of battlefield damage that had shown JP-8 was inherently a safer fuel (for example, less susceptible to ignition and sustained fires). Also, JP-8 is essentially identical to JET A-1 and would be commercially available worldwide. The API gravity range for JP-8 is from 37.0 to 51.0. JP-8 is JET A (CONUS) or JET A-1 (OCONUS) combined with the additives: FSII, SDA and Corrosive Inhibitor. JP-8 has been established as the single fuel for the battlefield by DOD directive. JP-8 is used in both aviation turbine engines and compression ignition engines.


JET A (CONUS) and JET A-1 (OCONUS) aviation turbine fuel is essentially identical to JP-8 except it does not contain the three additives required in JP-8. JET A/JET A-1 is the standard fuel used by commercial airlines worldwide. It is procured under ASTM D 1655.

Capt. Horatio Slappy !!
4th Jul 2001, 09:32
I used to be a fuels specialist and pilot for Hammonds Fuel Additives:
www.hammondscos.com (http://www.hammondscos.com)
They are the only company providing fuel additive injection technology to the U.S. military in the form of JP8+100 with the 5 additives mentioned in excellent detail above, suffice to say that the method of injection is via a self proportioning flow-motive pump that in fact derives it's power via the passage of fuel through it. Additive rate thus varies with fuel rate.
If you contact the above you will receive a very warm reception from those folks and they will go out of their way to provide you with additional information.

Gaspasser
9th Jul 2001, 19:31
Flypuppy,
JP8+100 is a additive designed to improve the thermal stabilty of jet fuel.It is added at a ratio of 1 to 4000. It is currently being used by the USAF and the Danish Air Force, many other air forces are also evaluating the product. It is also being evaluated in three KLM 747 aircraft to see if benefits can be identified in civil use i.e. SFC improvement, emissions, reduced maintenance costs etc.
It is being sold outside the US by one of the UK oil companies.Drop me an e-mail if you want further tech info.
p.s. JP8 will be around with the military for at least another decade

[ 09 July 2001: Message edited by: Gaspasser ]

Dan Winterland
10th Jul 2001, 00:26
I understand the SFC is improved by the increased burning temperature of the fuel, and engines cleared for the use of JP8+100 have been modified as such. No RAF aircraft are cleared to burn it, and some engine design authorities have stated irreperable damge may be caused by using it.

Gaspasser
10th Jul 2001, 19:14
Actually,this is not the case.
What it does is allow the fuel to be operated at a higher temp within the engine fuel system before the fuel breaks down into coke deposits and laquers. So it can help keep the fuel system cleaner and also reduces afterburner problems. RR have not approved it yet but it is undergoing evaluation. Hear it is currently being trialed in a few Goshawks in the US. It is already fully approved by GE and PW.

boofhead
11th Jul 2001, 07:48
On a related note, can anyone tell me what JET A-50 is? It is what is written on the bowsers in Anchorage. And does anyone know if anti ice additives are used during the winter months?

Gaspasser
12th Jul 2001, 14:43
JET A-50 means that it is a special low temperature fuel with a freeze point of -50 degrees. Normal JET A-1 has a freeze point of -47 degrees. Not much difference I know but I guess every extra degree counts in that part of the world.
As the FSII is used to prevent icing of fuel in the wing tanks during flight, and that at altitude it is very cold all the year round, it does not matter whether its summer or winter.

boofhead
14th Jul 2001, 14:14
Thanks. I should have been more specific; I wanted to know whether the temp was C or F. There is not much difference at that temperature but it could be important. I have asked several engineers in ANC and they don't know either. If anyone does I would appreciate the info.
JET A fuel has a freeze point of minus 40 C (or F it doesnt matter).

xyz_pilot
14th Jul 2001, 19:36
Out of interest what is the difference between

JET A

AND

JET A1


Thanks in advance.

Cardinal
15th Jul 2001, 05:48
It's mentioned above, but to clarify

Freezing point (approx).
Jet A -40C
Jet A1 -47C

xyz_pilot
15th Jul 2001, 15:17
Thanks Cardinal