Jet fuel

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An Airbus A310 being fueled at Prague Ruzyně Airport

Jet fuel is a type of aviation fuel designed for use in aircraft powered by gas-turbine engines. It is clear to straw-colored in appearance. The most commonly used fuels for commercial aviation are Jet A and Jet A-1 which are produced to a standardized international specification. The only other jet fuel commonly used in civilian turbine-engine powered aviation is Jet B which is used for its enhanced cold-weather performance.

Jet fuel is a mixture of a large number of different hydrocarbons. The range of their sizes (molecular weights or carbon numbers) is restricted by the requirements for the product, for example, the freezing point or smoke point. Kerosene-type jet fuel (including Jet A and Jet A-1) has a carbon number distribution between about 8 and 16 carbon numbers (carbon atoms per molecule); wide-cut or naphtha-type jet fuel (including Jet B), between about 5 and 15 carbon numbers.[1]

Contents

[edit] History of jet fuel

Fuel for piston-engine powered aircraft (usually a high-octane gasoline known as avgas) has a low flash point to improve its ignition characteristics. Turbine engines can operate with a wide range of fuels, and jet-aircraft engines typically use fuels with higher flash points, which are less flammable and therefore safer to transport and handle. The first jet fuels were based on kerosene or a gasoline-kerosene mix, and most jet fuels are still kerosene-based. Both British and American standards for jet fuels were first established at the end of World War II. British standards derived from standards for kerosine use for lamps, whereas American standards derived from aviation gasoline practices. Over the subsequent years, details of specifications were adjusted, such as minimum freezing point, to balance performance requirements and availability of fuels. Very low temperature freezing points reduce the availability of fuel. Higher flash point products required for use on aircraft carriers are more expensive to produce.[2] In the United States, ASTM International produces standards for civilian fuel types, and the U.S. Department of Defense produces standards for military use. The British Ministry of Defence establishes standard for both civil and military jet fuels.[2] For reasons of inter-operational ability, British and U.S. military standards are harmonized to a degree. In Russia and former Soviet Union countries, grades of jet fuels are covered by the State Standard (GOST) number, or a Technical Condition (TU) number, with the principal grade available in Russia and members of the CIS being TS-1.

[edit] Types

[edit] Jet A

Shell Jet A-1 refueller truck on the ramp at Vancouver International Airport. Note the signs indicating UN1863 hazardous material and JET A-1.
A US Airways Boeing 757 being fueled at Fort Lauderdale – Hollywood International Airport.

Jet A specification fuel has been used in the United States since the 1950s and is only available in the United States (and at Gander Airport in Newfoundland by Shell Aviation), whereas Jet A-1 is the standard specification fuel used in the rest of the world. Both Jet A and Jet A-1 have a flash point higher than 38 °C (100 °F), with an autoignition temperature of 210 °C (410 °F). This means that the fuel is safer to handle than traditional avgas.

[edit] Differences between Jet A and Jet A-1

The primary differences between Jet A and Jet A-1 are the higher freezing point of Jet A (−40 °C vs −47 °C for Jet A-1), and the mandatory requirement for the addition of an anti-static additive to Jet A-1.

Like Jet A-1, Jet A can be identified in trucks and storage facilities by the UN number 1863 Hazardous Material placards.[3] Jet A trucks, storage tanks, and pipes that carry Jet A are marked with a black sticker with a white "Jet A" written over it, next to another black stripe.

The annual U.S. usage of jet fuel was 20.2 billion US gallons (7.6×1010 L) in 2009.[4]

[edit] Typical physical properties for Jet A and Jet A-1

Jet A-1 Fuel must meet the specification for DEF STAN 91-91 (Jet A-1), ASTM specification D1655 (Jet A-1) and IATA Guidance Material (Kerosine Type), NATO Code F-35.

Jet A Fuel must reach ASTM specification D1655 (Jet A) [5]

Typical physical properties for Jet A / Jet A-1 fuel:[6][dead link]

Jet A-1 Jet A
Flash point 42 °C 51.1 °C
Autoignition temperature 210 °C (410 °F)[7]
Freezing point −47 °C (−52.6 °F) −40 °C (−40 °F)
Open air burning temperatures 260-315 °C (500-599 °F)[7]
Density at 15 °C (59 °F) .804 kg/L .820 kg/L
Specific energy 43.15 MJ/kg 43.02 MJ/kg
Energy density 34.7 MJ/L 35.3 MJ/L

[edit] Jet B

Jet B is a fuel in the naphtha-kerosene region that is used for its enhanced cold-weather performance. However, Jet B's lighter composition makes it more dangerous to handle.[5] For this reason it is rarely used, except in very cold climates. A blend of approximately 30% kerosene and 70% gasoline, it is known as wide-cut fuel. It has a very low freezing point of -60 degrees Celsius and a low flash point as well. It is primarily used in US and some military aircraft.

[edit] Additives

The DEF STAN 91-91 (UK) and ASTM D1655 (international) specifications allow for certain additives to be added to jet fuel, including:[8][9]

[edit] Water in jet fuel

It is very important that jet fuel be free from water contamination. During flight, the temperature of the fuel in the tanks decreases, due to the low temperatures in the upper atmosphere. This causes precipitation of the dissolved water from the fuel. The separated water then drops to the bottom of the tank, because it is denser than the fuel. From this time on, as the water is no longer in solution, it can freeze, blocking fuel inlet pipes. This was the cause of the British Airways Flight 38 accident. Removing all water from fuel is impractical, therefore fuel heaters are usually used on commercial aircraft to prevent water in fuel from freezing.

There are several methods for detecting water in jet fuel. A visual check may detect high concentrations of suspended water, as this will cause the fuel to become hazy in appearance. An industry standard chemical test for the detection of free water in jet fuel uses a water-sensitive filter pad that turns green if the fuel exceeds the specification limit of 30ppm (parts per million) free water.[11]

[edit] Military jet fuels

Military organizations around the world use a different classification system of JP (for "Jet Propellant") numbers. Some are almost identical to their civilian counterparts and differ only by the amounts of a few additives; Jet A-1 is similar to JP-8, Jet B is similar to JP-4. Other military fuels are highly specialized products and are developed for very specific applications.

Jet fuels are sometimes classified as kerosene or naphtha-type.[2] Kerosene-type fuels include Jet A, Jet A-1, JP-5 and JP-8. Naphtha-type jet fuels, sometimes referred to as "wide-cut" jet fuel, include Jet B and JP-4.[2]

JP-1 was an early jet fuel [12] specified in 1944 by the U.S. government (AN-F-32). It was a pure kerosene fuel with high flash point (relative to aviation gasoline) and a freezing point of −60 °C. The low freezing point requirement limited availability of the fuel and it was soon superseded by other "wide cut" jet fuels which were kerosene-naphtha or kerosene-gasoline blends. It was also known as avtur.

JP-2 and JP-3 are obsolete types developed during World War II. JP-2 was intended to be easier to produce than JP-1 since it had a higher freezing point, but was never widely used. JP-3 was even more volatile than JP-2 and intended to improve production, but its volatility lead to high evaporation loss in service. [13]

Jet fuel
Identifiers
CAS number 70892-11-4 (fuel oil no. 5) YesY, 8008-20-6 (kerosene) YesY
Properties
Appearance Yellow liquid
Density 0.81 kg/L
Melting point

-47.8 °C, 225 K, -54 °F
Boiling point

176 °C, 449 K, 349 °F
Hazards
MSDS MSDS
NFPA 704
NFPA 704.svg
2
2
0
Flash point 60 °C (140 °F)
 YesY (verify) (what is: YesY/N?)
Except where noted otherwise, data are given for materials in their standard state (at 25 °C, 100 kPa)
Infobox references

JP-4 was a 50-50 kerosene-gasoline blend. It had lower flash point than JP-1, but was preferred because of its greater availability. It was the primary U.S. Air Force jet fuel between 1951 and 1995. Its NATO code is F-40. It is also known as avtag.

JP-5 is a yellow kerosene-based jet fuel developed in 1952 for use in aircraft stationed aboard aircraft carriers, where the risk from fire is particularly great. JP-5 is a complex mixture of hydrocarbons, containing alkanes, naphthenes, and aromatic hydrocarbons that weighs 6.8 pounds per U.S. gallon (0.81 kg/L) and has a high flash point (min. 60 °C or 140 °F).[14] It is the primary jet fuel for most navies.[citation needed] Its freezing point is −46 °C (−51 °F). It does not contain antistatic agents. Other names for JP-5 are: NCI-C54784, Fuel oil no. 5, Residual oil no. 5. JP-5's NATO code is F-44. It is also called AVCAT fuel for Aviation carrier turbine fuel.[15]

JP-6
Flash point: tbd
Autoignition temperature: tbd
Freezing point: tbd
Open air burning temperatures: tbd
Specific Weight: 6.55 lb/gal[16]
Military Specification: MIL-J-25656

The JP-4 and JP-5 fuels, covered by the MIL-DTL-5624 and meet the British Specification DEF STAN 91-86 AVCAT/FSII (formerly DERD 2452).[17], are intended for use in aircraft turbine engines. These fuels require military-unique additives that are necessary in military weapon systems, engines, and missions.

JP-6 is a type of jet fuel developed for General Electric YJ93 jet engine of the XB-70 Valkyrie supersonic aircraft. JP-6 was similar to JP-5 but with a lower freezing point and improved thermal oxidative stability. When the XB-70 program was cancelled, the JP-6 specification, MIL-J-25656, was also cancelled.[18]

JP-7 was developed for the twin Pratt & Whitney J58 turbojet/ramjet engines of the SR-71 Blackbird and has a high flash point to better cope with the heat and stresses of high speed supersonic flight.

JP-8 is a jet fuel, specified and used widely by the US military. It is specified by MIL-DTL-83133 and British Defence Standard 91-87. JP-8 is a kerosene-based fuel, projected to remain in use at least until 2025. It was first introduced at NATO bases in 1978. Its NATO code is F-34.

JPTS was developed in 1956 for the Lockheed U-2 spy plane.

Zip fuel designates a series of experimental boron-containing "high energy fuels" intended for long range aircraft. The toxicity and undesirable residues of the fuel made it difficult to use. The development of the ballistic missile removed the principal application of zip fuel.

Syntroleum has been working with the U. S. Air Force to develop a synthetic jet fuel blend that will help the Air Force to reduce its dependence on imported petroleum. The Air Force, which is the U.S. military's largest user of fuel, began exploring alternative fuel sources in 1999. On December 15, 2006, a B-52 took off from Edwards AFB for the first time powered solely by a 50-50 blend of JP-8 and Syntroleum's FT fuel. The seven-hour flight test was considered a success. The goal of the flight test program was to qualify the fuel blend for fleet use on the service's B-52s, and then flight test and qualification on other aircraft. On August 8, 2007, Air Force Secretary Michael Wynne certified the B-52H as fully approved to use the FT blend, marking the formal conclusion of the test program. This program is part of the Department of Defense Assured Fuel Initiative, an effort to develop secure domestic sources for the military energy needs. The Pentagon hopes to reduce its use of crude oil from foreign producers and obtain about half of its aviation fuel from alternative sources by 2016. With the B-52 now approved to use the FT blend, the USAF will use the test protocols developed during the program to certify the C-17 Globemaster III and then the B-1B to use the fuel. To test these two aircraft, the Air Force has ordered 281,000 US gallons (1,060,000 L) of FT fuel. The Air Force intends to test and certify every airframe in its inventory to use the fuel by 2011. They will also supply over 9,000 US gallons (34,000 L) to NASA for testing in various aircraft and engines. The USAF has certified the B-1B, B-52H, C-17, C-130J, F-4 (as QF-4 target drones), F-15, F-22, and T-38 to use the synthetic fuel blend.[19]

The US Air Force C-17 Globemaster III was built to perform development testing.

The US Air Force’s C-17 Globemaster III, F-16 and F-15 are certified for use of hydrotreated renewable jet fuels.[20][21] The US Air Force plans to certify over 40 models for fuels derived from waste oils and plants by 2013.[21] The army is considered one of the few customers of biofuels large enough to potentially bring biofuels up to the volume production needed to reduce costs.[21] The US Navy has also flown a [Boeing F/A-18E/F Super Hornet] dubbed the "Green Hornet" at 1.7 times the speed of sound using a biofuel blend.[21] The Defense Advanced Research Projects Agency (DARPA) funded a $6.7 million project with Honeywell UOP to develop technologies to create jet fuels from biofeedstocks for use by the US and NATO militaries.[22]

[edit] Piston engine use

Jet fuel is very similar to Diesel fuel, and in some cases, may be burned in Diesel engines. The possibility of environmental legislation banning the use of leaded avgas, and the lack of a replacement fuel with similar performance, has left aircraft designers and pilot's organizations searching for alternative engines for use in small aircraft.[23] As a result, a few aircraft engine manufacturers, most notably Thielert and Austro_Engine, have begun offering aircraft Diesel engines which run on jet fuel. This technology has potential to simplify airport logistics by reducing the number of fuel types required. Jet fuel is available in most places in the world, whereas avgas is only widely available in a few countries which have a large number of general aviation aircraft. A Diesel engine may also potentially be more environmentally friendly and fuel-efficient than an avgas engine. However, very few diesel aircraft engines have been certified by aviation authorities. Diesel aircraft engines are uncommon today, even though opposed-piston aviation diesel powerplants such as the Junkers Jumo 205 family had been used during the Second World War.

Jet fuel is often used in ground support vehicles at airports, instead of Diesel. The United States military makes heavy use of JP-8, for instance. However, jet fuel tends to have poor lubricating ability in comparison to Diesel, thereby increasing wear on fuel pumps and other related engine parts.[citation needed] Civilian vehicles tend to disallow its use, or require that an additive be mixed with the jet fuel to restore its lubricity. Since jet fuel is also significantly more expensive than Diesel, some critics[who?] consider using jet fuel in ground vehicles as wasteful.

[edit] Synthetic jet fuel

Main article: Synthetic fuel

A significant effort is under way to certify Fischer–Tropsch (FT) Synthesized Paraffinic Keroseen (SPK) synthetic fuels for use in U.S. and international aviation fleets. In this effort is being led by an industry coalition known as the Commercial Aviation Alternative Fuels Initiative (CAAFI),[24] also supported by a parallel initiative under way in the U.S. Air Force,[25] to certify FT fuel for use in all aviation platforms. The U.S. Air Force has a stated goal of certifying its entire fleet for use with FT synthetic fuel blends by 2011.[26] The CAAFI initiative aims to certify the civilian aviation fleet for FT synthetic fuels blends by 2010, and has programs under way to certify Hydroprocessed Esters and Fatty Acids (HEFA) (aka Hydrogenated Renewable Jet (HRJ)) SPK biofuels as early as 2013.[27] "Hydroprocessed" and "hydrotreated" have also been used in lieu of "hydrogenated". Both FT and HEFA based SPKs blended with JP-8 are specified in MIL-DTL-83133H.

Synthetic jet fuels show a reduction in pollutants such as SOx, NOx, particulate matter, and hydrocarbon emissions.[28] It is envisaged that usage of synthetic jet fuels will increase air quality around airports which will be particularly advantageous at inner city airports.[29][dead link]

  • Qatar Airways became the first airline to operate a commercial flight on a 50:50 blend of synthetic Gas to Liquid (GTL) jet fuel and conventional jet fuel. The natural gas derived synthetic kerosene for the six-hour flight from London to Doha came from Shell’s GTL plant in Bintulu, Malaysia.[30]
  • The world's first passenger aircraft flight to use only synthetic jet fuel was from Lanseria International Airport to Cape Town International Airport on 22 September 2010. The fuel was developed by Sasol.[31]

[edit] Jet biofuels

Main article: Aviation biofuel

The air transport industry is responsible for 2 percent of man-made carbon dioxide emitted.[32] Boeing estimates that biofuels could reduce flight-related greenhouse-gas emissions by 60 to 80 percent. One possible solution which has received more media coverage than others would be blending synthetic fuel derived from algae with existing jet fuel:[33]

Green Flight International became the first airline to fly jet aircraft on 100% biofuel. The flight from Stead airport in Stead, Nevada was in an Aero L-29 Delfín piloted by Carol Sugars and Douglas Rodante.[34]

  • Boeing and Air New Zealand are collaborating with Tecbio [35] Aquaflow Bionomic and other jet biofuel developers around the world.
  • Virgin Atlantic Airways successfully tested a biofuel blend consisting of 20% babassu nuts and coconut and 80% conventional jet fuel, which was fed to a single engine on a 747 flight from London to Amsterdam.[36]
  • A consortium consisting of Boeing, NASA's Glenn Research Center, MTU Aero Engines (Germany), and the U.S. Air Force Research Laboratory is working on development of jet fuel blends containing a substantial percentage of biofuel.[37]
  • British Airways and Solena Group are establishing a sustainable jet fuel plant in East London, UK as BA plans to use the biofuel to power part of its fleet from 2014.[38]
  • 24 commercial and military biofuel flights have taken place using Honeywell “Green Jet Fuel,” including a Navy F/A-18 Hornet.[39]

Oil prices increased about fivefold from 2003 to 2008, raising fears that world petroleum production is becoming unable to keep up with demand. The fact that there are few alternatives to petroleum for aviation fuel adds urgency to the search for alternatives. Twenty-five airlines were bankrupted or stopped operations in the first six months of 2008, largely due to fuel costs.[40]

[edit] See also

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[edit] References

  1. ^ Chevron Products Corporation. "Aviation Turbine Fuel Composition". http://www.chevron.com/products/prodserv/fuels/bulletin/aviationfuel/4_at_fuel_comp.shtm. [dead link]
  2. ^ a b c d Salvatore J. Rand,(ed), Significance of Tests for Petroleum Products (8th Edition) ASTM International, 2010, ISBN 978-1-61583-673-4 page 88
  3. ^ U.S. DOT. "U.S. Department of Transportation 2008 Emergency Response Guide (ERG)". http://wwwapps.tc.gc.ca/saf-sec-sur/3/erg-gmu/erg/idindex.aspx?page=15. 
  4. ^ Energy Information Administration. "U.S. Prime Supplier Sales Volumes of Petroleum Products". http://tonto.eia.doe.gov/dnav/pet/pet_cons_prim_dcu_nus_a.htm. 
  5. ^ a b "Aviation Fuel - Jet Fuel Information". Csgnetwork.com. 2004-01-05. http://www.csgnetwork.com/jetfuel.html. Retrieved 2010-11-28. 
  6. ^ BP
  7. ^ a b Jet Fuel - ME Petroleum
  8. ^ Turbine Fuel, Aviation Kerosine Type, Jet A-1. Ministry of Defence (UK) Standard 91-91, Issue 6, 2008-08-25.
  9. ^ Standard Specification for Aviation Turbine Fuels, ASTM D1655-09a (2010). ASTM International, West Conshohocken, Pennsylvania, USA.
  10. ^ Lombardo, David A., "Fuel-quality evaluation requires pilot vigilance". Aviation International News, July 2005.
  11. ^ The Shell Water Detector
  12. ^ Aviation Fuel - US Centenial of Flight Commission, Retrieved 3 January 2012
  13. ^ Larry Reithmaier, Mach 1 and Beyond: The Illustrated Guide to High-Speed Flight, (McGraw-Hill Professional, 1994), ISBN 0070520216, page 104
  14. ^ Characteristics of Fuels Marine Corps Schools Detachment - Ft. Leonard Wood
  15. ^ UK MOD DEF STAN 23-8 ISSUE 2
  16. ^ Taube, L.J.–Study Manager (April 1972). "Vol. III" (pdf). B-70 Aircraft Study Final Report. North American Rockwell. http://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19950002360_1995102360.pdf. Retrieved 2008-10-31. 
  17. ^ Shell Fuels Technical Data Sheet - F-44
  18. ^ The History of Jet Fuel Air BP
  19. ^ Sirak, Michael (1/27/2010). "B-2 Goes Synthetic". Air Force Magazine. http://www.airforce-magazine.com/DRArchive/Pages/2010/January%202010/January%2027%202010/B-2GoesSynthetic.aspx. Retrieved 7 July 2012. 
  20. ^ Dowdell, Richelle (February 10, 2011). "Officials certify first aircraft for biofuel usage". The Official Website of the US Air Force. http://www.af.mil/news/story.asp?id=123242117%29. Retrieved March 7, 2012. 
  21. ^ a b c d Morales, Alex; Louise Downing (October 18, 2011). "Fat Replaces Oil for F-16s as Biofuels Head to War: Commodities". BusinessWeek. http://www.businessweek.com/news/2011-10-18/fat-replaces-oil-for-f-16s-as-biofuels-head-to-war-commodities.html. Retrieved March 7, 2012. 
  22. ^ "UOP To Develop Technology to Produce Bio JP-8 for Military Jets". Green Car Congress. June 28, 2007. http://www.greencarcongress.com/2007/06/uop-to-develop-.html. Retrieved March 7, 2012. 
  23. ^ Planemakers challenged to find unleaded fuel option - The Wichita Eagle[dead link]
  24. ^ "Significant progress made towards adoption of semi-synthetic aviation fuel". http://www.caafi.org/information/pdf/CAAFI_factsheet_12dec2008.pdf. Retrieved 2009-06-24. 
  25. ^ "Synthetic Future, USAF Pushes Ahead With Fuel Production Despite Price Drop". http://www.defensenews.com/story.php?i=3969089&c=FEA&s=TEC. Retrieved 2009-06-24. 
  26. ^ "USAF drives biofuel bandwagon". http://www.flightglobal.com/articles/2009/02/09/322208/usaf-drives-biofuel-bandwagon.html. Retrieved 2009-06-24. 
  27. ^ "CAAFI pools aviation industry resources to certify synthetic jet fuel". http://www.flightglobal.com/articles/2008/02/25/221767/caafi-pools-aviation-industry-resources-to-certify-synthetic-jet-fuel.html. Retrieved 2009-06-24. 
  28. ^ Fuel Property, Emission Test, and Operability Results from a Fleet of Class 6 Vehicles Operating on Gas-To-Liquid Fuel and Catalyzed Diesel Particle Filters Yosemite Waters-Vehicle Evaluation Report - National Renewable Energy Lab
  29. ^ Best Synth Jet Fuel
  30. ^ "Qatar Airways Becomes First to Operate Commercial Flight on GTL Jet Fuel Blend". Green Car Congress. 2009-10-12. http://www.greencarcongress.com/2009/10/qatar-gtl-20091012.html. 
  31. ^ "Sasol takes to the skies with the world’s first fully synthetic jet fuel". Sasol. 2010-09-22. http://www.sasol.com/sasol_internet/frontend/navigation.jsp?articleTypeID=2&articleId=28500003&navid=1&rootid=1. 
  32. ^ "Beginner’s Guide to Aviation Biofuels". Air Transport Action Group. May 2009. http://www-org.airbus.com/store/mm_repository/pdf/att00014178/media_object_file_BeginnersGuide_Biofuels.pdf. Retrieved 2009-09-20. 
  33. ^ "A Promising Oil Alternative: Algae Energy". The Washington Post. 2008-01-06. http://www.washingtonpost.com/wp-dyn/content/article/2008/01/03/AR2008010303907.html. Retrieved 2010-05-06. 
  34. ^ "Gfi Home". Greenflightinternational.com. http://www.greenflightinternational.com/index.htm. Retrieved 2010-11-28. 
  35. ^ "Tecbio". Tecbio. http://www.tecbio.com.br/. Retrieved 2010-11-28. 
  36. ^ "Crop this: Virgin takes off with nut-fuel - 26 Feb 2008 - NZ Herald: New Zealand Business, Markets, Currency and Personal Finance News". NZ Herald. 2008-02-26. http://www.nzherald.co.nz/section/3/story.cfm?c_id=3&objectid=10494543. Retrieved 2010-11-28. 
  37. ^ "2008 Environment Report". Boeing. http://www.boeing.com/aboutus/environment/environmental_report/alternative-energy-solutions.html. Retrieved 2010-11-28. 
  38. ^ British Airways to use Biofuel
  39. ^ Koch, Wendy (November 7, 2011). "United flies first U.S. passengers using fuel from algae". USA Today. http://content.usatoday.com/communities/greenhouse/post/2011/11/united-flies-first-us-passengers-with-biofuel-from-algae/1. Retrieved December 16, 2011. 
  40. ^ "More airlines fold as fuel prices soar: IATA". News.asiaone.com. http://news.asiaone.com/News/Latest+News/Business/Story/A1Story20080708-75407.html. Retrieved 2010-11-28. 

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