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69-501: Engine output peaks at 1,500 hp (1,100 kW), with 2,750 lb⋅ft (3,730 N⋅m) of torque at that peak, which occurs at 3,000 rpm. The turbine can provide torque in excess of 667 lb⋅ft (904 N⋅m) at significantly lower RPMs. The engine weighs approximately 2,500 lb (1,100 kg) and occupies a volume of 40 cu ft (1.1 m), measuring 63 in × 40 in × 28 in (1,600 mm × 1,020 mm × 710 mm). The engine can use

138-409: A standard pressure such as 1 atmosphere or 100 kPa . When considered as the temperature of the reverse change from liquid to solid, it is referred to as the freezing point or crystallization point . Because of the ability of substances to supercool , the freezing point can easily appear to be below its actual value. When the "characteristic freezing point" of a substance is determined, in fact,

207-561: A blend with conventional jet fuel. As of the end of 2017, four other pathways to SPK are certified, with their designations and maximum blend percentage in brackets: Hydroprocessed Esters and Fatty Acids (HEFA SPK, 50%); synthesized iso-paraffins from hydroprocessed fermented sugars (SIP, 10%); synthesized paraffinic kerosene plus aromatics (SPK/A, 50%); alcohol-to-jet SPK (ATJ-SPK, 30%). Both FT and HEFA based SPKs blended with JP-8 are specified in MIL-DTL-83133H. Some synthetic jet fuels show

276-491: A curve of temperature versus current can be drawn. This curve can then be extrapolated to very high temperatures. In determining melting points of a refractory substance by this method, it is necessary to either have black body conditions or to know the emissivity of the material being measured. The containment of the high melting material in the liquid state may introduce experimental difficulties. Melting temperatures of some refractory metals have thus been measured by observing

345-482: A function of temperature. In this way, the measurement of the absolute magnitude of the intensity of radiation is unnecessary. However, known temperatures must be used to determine the calibration of the pyrometer. For temperatures above the calibration range of the source, an extrapolation technique must be employed. This extrapolation is accomplished by using Planck's law of radiation. The constants in this equation are not known with sufficient accuracy, causing errors in

414-586: A high volatility to improve its carburetion characteristics and high autoignition temperature to prevent preignition in high compression aircraft engines. Turbine engines (as with diesel engines ) can operate with a wide range of fuels because fuel is injected into the hot combustion chamber. Jet and gas turbine ( turboprop , helicopter ) aircraft engines typically use lower cost fuels with higher flash points , which are less flammable and therefore safer to transport and handle. The first axial compressor jet engine in widespread production and combat service,

483-605: A melting point; on heating they undergo a smooth glass transition into a viscous liquid . Upon further heating, they gradually soften, which can be characterized by certain softening points . The freezing point of a solvent is depressed when another compound is added, meaning that a solution has a lower freezing point than a pure solvent. This phenomenon is used in technical applications to avoid freezing, for instance by adding salt or ethylene glycol to water. In organic chemistry , Carnelley's rule , established in 1882 by Thomas Carnelley , states that high molecular symmetry

552-399: A precise measurement of its exact melting point has yet to be confirmed. At the other end of the scale, helium does not freeze at all at normal pressure even at temperatures arbitrarily close to absolute zero ; a pressure of more than twenty times normal atmospheric pressure is necessary. Notes Many laboratory techniques exist for the determination of melting points. A Kofler bench

621-506: A process to make jet fuel from seawater. The technology requires an input of electrical energy to separate Oxygen (O 2 ) and Hydrogen (H 2 ) gas from seawater using an iron-based catalyst, followed by an oligomerization step wherein carbon monoxide (CO) and hydrogen are recombined into long-chain hydrocarbons, using zeolite as the catalyst. The technology is expected to be deployed in the 2020s by U.S. Navy warships, especially nuclear-powered aircraft carriers. On February 8, 2021,

690-416: A pure substance is always higher and has a smaller range than the melting point of an impure substance or, more generally, of mixtures. The higher the quantity of other components, the lower the melting point and the broader will be the melting point range, often referred to as the "pasty range". The temperature at which melting begins for a mixture is known as the solidus while the temperature where melting

759-465: A reduction in pollutants such as SOx, NOx, particulate matter, and sometimes carbon emissions. It is envisaged that usage of synthetic jet fuels will increase air quality around airports which will be particularly advantageous at inner city airports. 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

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828-669: A result, a few aircraft engine manufacturers, most notably Thielert and Austro Engine , have begun offering aircraft diesel engines which run on jet fuel which may 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 be more 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

897-577: A transparent window (most basic design: a Thiele tube ) and a simple magnifier. Several grains of a solid are placed in a thin glass tube and partially immersed in the oil bath. The oil bath is heated (and stirred) and with the aid of the magnifier (and external light source) melting of the individual crystals at a certain temperature can be observed. A metal block might be used instead of an oil bath. Some modern instruments have automatic optical detection. The measurement can also be made continuously with an operating process. For instance, oil refineries measure

966-522: A variety of fuels, including jet fuel , gasoline , diesel and marine diesel . The engine is a three-shaft machine composed of five sub-modules: Development had started by 1964 with a contract given to Chrysler in 1976, originally as an engine for the later cancelled MBT-70 . In the early 1970s, the AGT1500 was developed into the PLT27 , a flight-weight turboshaft for use in helicopters. This engine lost to

1035-403: Is a refractory compound with the highest known melting point of any substance to date and the only one confirmed to have a melting point above 4,273 K (4,000 °C; 7,232 °F) at ambient pressure. Quantum mechanical computer simulations predicted that this alloy (HfN 0.38 C 0.51 ) would have a melting point of about 4,400 K. This prediction was later confirmed by experiment, though

1104-426: Is a metal strip with a temperature gradient (range from room temperature to 300 °C). Any substance can be placed on a section of the strip, revealing its thermal behaviour at the temperature at that point. Differential scanning calorimetry gives information on melting point together with its enthalpy of fusion . A basic melting point apparatus for the analysis of crystalline solids consists of an oil bath with

1173-401: Is a mixture of a variety of hydrocarbons . Because the exact composition of jet fuel varies widely based on petroleum source, it is impossible to define jet fuel as a ratio of specific hydrocarbons. Jet fuel is therefore defined as a performance specification rather than a chemical compound. Furthermore, the range of molecular mass between hydrocarbons (or different carbon numbers) is defined by

1242-406: Is a naphtha-kerosene fuel that is used for its enhanced cold-weather performance. However, Jet B's lighter composition makes it more dangerous to handle. 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 °C (−76 °F), and a low flash point as well. It

1311-443: Is a type of aviation fuel designed for use in aircraft powered by gas-turbine engines . It is colorless 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

1380-428: Is associated with high melting point . Carnelley based his rule on examination of 15,000 chemical compounds. For example, for three structural isomers with molecular formula C 5 H 12 the melting point increases in the series isopentane −160 °C (113 K) n-pentane −129.8 °C (143 K) and neopentane −16.4 °C (256.8 K). Likewise in xylenes and also dichlorobenzenes the melting point increases in

1449-425: Is complete is called the liquidus . Eutectics are special types of mixtures that behave like single phases. They melt sharply at a constant temperature to form a liquid of the same composition. Alternatively, on cooling a liquid with the eutectic composition will solidify as uniformly dispersed, small (fine-grained) mixed crystals with the same composition. In contrast to crystalline solids, glasses do not possess

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1518-476: Is considered one of the few customers of biofuels large enough to potentially bring biofuels up to the volume production needed to reduce costs. The U.S. 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. 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

1587-444: Is known as hysteresis . The melting point of ice at 1 atmosphere of pressure is very close to 0 °C (32 °F; 273 K); this is also known as the ice point. In the presence of nucleating substances , the freezing point of water is not always the same as the melting point. In the absence of nucleators water can exist as a supercooled liquid down to −48.3 °C (−54.9 °F; 224.8 K) before freezing. The metal with

1656-584: Is primarily used in northern Canada and Alaska , where the extreme cold makes its low freezing point necessary, and which helps mitigate the danger of its lower flash point. TS-1 is a jet fuel made to Russian standard GOST 10227 for enhanced cold-weather performance. It has somewhat higher volatility than Jet A-1 (flash point is 28 °C (82 °F) minimum). It has a very low freezing point, below −50 °C (−58 °F). The DEF STAN 91-091 (UK) and ASTM D1655 (international) specifications allow for certain additives to be added to jet fuel, including: As

1725-437: Is sensitive to extremely large changes in pressure , but generally this sensitivity is orders of magnitude less than that for the boiling point , because the solid-liquid transition represents only a small change in volume. If, as observed in most cases, a substance is more dense in the solid than in the liquid state, the melting point will increase with increases in pressure. Otherwise the reverse behavior occurs. Notably, this

1794-510: Is the atomic mass , ν is the frequency , u is the average vibration amplitude, k B is the Boltzmann constant , and T is the absolute temperature . If the threshold value of u is c a where c is the Lindemann constant and a is the atomic spacing , then the melting point is estimated as Several other expressions for the estimated melting temperature can be obtained depending on

1863-478: Is the case of water, as illustrated graphically to the right, but also of Si, Ge, Ga, Bi. With extremely large changes in pressure, substantial changes to the melting point are observed. For example, the melting point of silicon at ambient pressure (0.1 MPa) is 1415 °C, but at pressures in excess of 10 GPa it decreases to 1000 °C. Melting points are often used to characterize organic and inorganic compounds and to ascertain their purity . The melting point of

1932-399: Is the mandatory addition of an antistatic additive to Jet A-1 fuel. Jet A and Jet A-1 fuel trucks and storage tanks, as well as plumbing that carries them, are all marked "Jet A" or "Jet A-1" in white italicized text within a black rectangle background, adjacent to one or two diagonal black stripes. Jet A-1 fuel must meet: Jet A fuel must reach ASTM specification D1655 (Jet A). Jet B

2001-499: Is very similar to diesel fuel , and in some cases, may be used in diesel engines . The possibility of environmental legislation banning the use of leaded avgas (fuel in spark-ignited internal combustion engine, which usually contains tetraethyllead (TEL), a toxic substance added to prevent engine knocking ), 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. As

2070-738: The General Electric GE12 (T700) in three separate competitions to power the UH-60, AH-64, and SH-60. Serial production of the AGT1500 began in 1980; by 1992, more than 11,000 engines had been delivered. In 1986, with the Cold War about to wind down, Textron Lycoming began developing a commercial marine derivative, which they called the TF15. This technology-related article is a stub . You can help Misplaced Pages by expanding it . Jet fuel Jet fuel or aviation turbine fuel ( ATF , also abbreviated avtur )

2139-622: The Junkers Jumo 004 used on the Messerschmitt Me 262A fighter and the Arado Ar 234B jet recon-bomber, burned either a special synthetic "J2" fuel or diesel fuel. Gasoline was a third option but unattractive due to high fuel consumption. Other fuels used were kerosene or kerosene and gasoline mixtures. Most jet fuels in use since the end of World War II are kerosene-based. Both British and American standards for jet fuels were first established at

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2208-503: The Junkers Jumo 205 family had been used during the Second World War. Jet fuel is often used in diesel-powered ground-support vehicles at airports. However, jet fuel tends to have poor lubricating ability in comparison to diesel, which increases wear in fuel injection equipment. An additive may be required to restore its lubricity . Jet fuel is more expensive than diesel fuel but the logistical advantages of using one fuel can offset

2277-488: The entropy ( S ) of the material are increasing (ΔH, ΔS > 0). Melting phenomenon happens when the Gibbs free energy of the liquid becomes lower than the solid for that material. At various pressures this happens at a specific temperature. It can also be shown that: Here T , ΔS and ΔH are respectively the temperature at the melting point, change of entropy of melting and the change of enthalpy of melting. The melting point

2346-643: The B-1B, B-52H, C-17, Lockheed Martin C-130J Super Hercules , McDonnell Douglas F-4 Phantom (as QF-4 target drones ), McDonnell Douglas F-15 Eagle , Lockheed Martin F-22 Raptor , and Northrop T-38 Talon to use the synthetic fuel blend. The U.S. Air Force's C-17 Globemaster III, F-16 and F-15 are certified for use of hydrotreated renewable jet fuels. The USAF plans to certify over 40 models for fuels derived from waste oils and plants by 2013. The U.S. Army

2415-518: The State Standard ( GOST ) number, or a Technical Condition number, with the principal grade available being TS-1. Jet A specification fuel has been used in the United States since the 1950s and is usually not available outside the United States and a few Canadian airports such as Toronto , Montreal , and Vancouver , whereas Jet A-1 is the standard specification fuel used in most of the rest of

2484-680: The United States LSD is now only available to the off-road construction, locomotive and marine markets. As more EPA regulations are introduced, more refineries are hydrotreating their jet fuel production, thus limiting the lubricating abilities of jet fuel, as determined by ASTM Standard D445. JP-8 , which is similar to Jet A-1, is used in NATO diesel vehicles as part of the single-fuel policy. Fischer–Tropsch (FT) Synthesized Paraffinic Kerosene (SPK) synthetic fuels are certified for use in United States and international aviation fleets at up to 50% in

2553-805: The United States and NATO militaries. In April 2011, four USAF F-15E Strike Eagles flew over the Philadelphia Phillies opening ceremony using a blend of traditional jet fuel and synthetic biofuels. This flyover made history as it was the first flyover to use biofuels in the Department of Defense . The air transport industry is responsible for 2–3 percent of man-made carbon dioxide emitted. 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: Solazyme produced

2622-481: 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 standards for both civil and military jet fuels. For reasons of inter-operational ability, British and United States military standards are harmonized to a degree. In Russia and the CIS members, grades of jet fuels are covered by

2691-581: The actual methodology is almost always "the principle of observing the disappearance rather than the formation of ice, that is, the melting point ." For most substances, melting and freezing points are approximately equal. For example, the melting and freezing points of mercury is 234.32 kelvins (−38.83  °C ; −37.89  °F ). However, certain substances possess differing solid-liquid transition temperatures. For example, agar melts at 85 °C (185 °F; 358 K) and solidifies from 31 °C (88 °F; 304 K); such direction dependence

2760-401: The amplitude of vibration becomes large enough for adjacent atoms to partly occupy the same space. The Lindemann criterion states that melting is expected when the vibration root mean square amplitude exceeds a threshold value. Assuming that all atoms in a crystal vibrate with the same frequency ν , the average thermal energy can be estimated using the equipartition theorem as where m

2829-420: The aviation industry's jet kerosene demands have increased to more than 5% of all refined products derived from crude, it has been necessary for the refiner to optimize the yield of jet kerosene, a high-value product, by varying process techniques. New processes have allowed flexibility in the choice of crudes, the use of coal tar sands as a source of molecules and the manufacture of synthetic blend stocks. Due to

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2898-451: The container. For a solid to melt, heat is required to raise its temperature to the melting point. However, further heat needs to be supplied for the melting to take place: this is called the heat of fusion , and is an example of latent heat . From a thermodynamics point of view, at the melting point the change in Gibbs free energy (ΔG) of the material is zero, but the enthalpy ( H ) and

2967-413: The crystal phase is densely packed with many efficient intermolecular interactions resulting in a higher enthalpy change on melting. An attempt to predict the bulk melting point of crystalline materials was first made in 1910 by Frederick Lindemann . The idea behind the theory was the observation that the average amplitude of thermal vibrations increases with increasing temperature. Melting initiates when

3036-515: The darkening of the hole when the liquid phase appears, destroying the black body conditions. Today, containerless laser heating techniques, combined with fast pyrometers and spectro-pyrometers, are employed to allow for precise control of the time for which the sample is kept at extreme temperatures. Such experiments of sub-second duration address several of the challenges associated with more traditional melting point measurements made at very high temperatures, such as sample vaporization and reaction with

3105-473: 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 30 ppm (parts per million) free water. A critical test to rate the ability of jet fuel to release emulsified water when passed through coalescing filters is ASTM standard D3948 Standard Test Method for Determining Water Separation Characteristics of Aviation Turbine Fuels by Portable Separometer. Military organizations around

3174-589: The end of World War II. British standards derived from standards for kerosene use for lamps—known as paraffin in the UK—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. In

3243-840: The estimate of the average thermal energy. Another commonly used expression for the Lindemann criterion is From the expression for the Debye frequency for ν , where θ D is the Debye temperature and h is the Planck constant . Values of c range from 0.15 to 0.3 for most materials. In February 2011, Alfa Aesar released over 10,000 melting points of compounds from their catalog as open data and similar data has been mined from patents . The Alfa Aesar and patent data have been summarized in (respectively) random forest and support vector machines . Primordial   From decay   Synthetic   Border shows natural occurrence of

3312-473: The extra expense of its use in certain circumstances. Jet fuel contains more sulfur, up to 1,000 ppm, which therefore means it has better lubricity and does not currently require a lubricity additive as all pipeline diesel fuels require. The introduction of Ultra Low Sulfur Diesel or ULSD brought with it the need for lubricity modifiers. Pipeline diesels before ULSD were able to contain up to 500 ppm of sulfur and were called Low Sulfur Diesel or LSD. In

3381-408: The extrapolation to become larger at higher temperatures. However, standard techniques have been developed to perform this extrapolation. Consider the case of using gold as the source (mp = 1,063 °C). In this technique, the current through the filament of the pyrometer is adjusted until the light intensity of the filament matches that of a black-body at the melting point of gold. This establishes

3450-505: The first six months of 2008, largely due to fuel costs. In 2015 ASTM approved a modification to Specification D1655 Standard Specification for Aviation Turbine Fuels to permit up to 50 ppm (50 mg/kg) of FAME ( fatty acid methyl ester ) in jet fuel to allow higher cross-contamination from biofuel production. Worldwide demand of jet fuel has been steadily increasing since 1980. Consumption more than tripled in 30 years from 1,837,000 barrels/day in 1980, to 5,220,000 in 2010. Around 30% of

3519-464: The freeze point of diesel fuel "online", meaning that the sample is taken from the process and measured automatically. This allows for more frequent measurements as the sample does not have to be manually collected and taken to a remote laboratory. For refractory materials (e.g. platinum, tungsten, tantalum, some carbides and nitrides, etc.) the extremely high melting point (typically considered to be above, say, 1,800 °C) may be determined by heating

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3588-523: The highest melting point is tungsten , at 3,414 °C (6,177 °F; 3,687 K); this property makes tungsten excellent for use as electrical filaments in incandescent lamps . The often-cited carbon does not melt at ambient pressure but sublimes at about 3,700 °C (6,700 °F; 4,000 K); a liquid phase only exists above pressures of 10 MPa (99 atm) and estimated 4,030–4,430 °C (7,290–8,010 °F; 4,300–4,700 K) (see carbon phase diagram ). Hafnium carbonitride (HfCN)

3657-440: 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. Since the water is no longer in solution, it can form droplets which can supercool to below 0 °C (32 °F). If these supercooled droplets collide with a surface they can freeze and may result in blocked fuel inlet pipes. This

3726-425: The material in a black body furnace and measuring the black-body temperature with an optical pyrometer . For the highest melting materials, this may require extrapolation by several hundred degrees. The spectral radiance from an incandescent body is known to be a function of its temperature. An optical pyrometer matches the radiance of a body under study to the radiance of a source that has been previously calibrated as

3795-405: The number and severity of the processes used, it is often necessary and sometimes mandatory to use additives. These additives may, for example, prevent the formation of harmful chemical species or improve a property of a fuel to prevent further engine wear. 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

3864-443: The order meta, ortho and then para . Pyridine has a lower symmetry than benzene hence its lower melting point but the melting point again increases with diazine and triazines . Many cage-like compounds like adamantane and cubane with high symmetry have relatively high melting points. A high melting point results from a high heat of fusion , a low entropy of fusion , or a combination of both. In highly symmetrical molecules

3933-410: The primary calibration temperature and can be expressed in terms of current through the pyrometer lamp. With the same current setting, the pyrometer is sighted on another black-body at a higher temperature. An absorbing medium of known transmission is inserted between the pyrometer and this black-body. The temperature of the black-body is then adjusted until a match exists between its intensity and that of

4002-658: The program to certify the Boeing C-17 Globemaster III and then the Rockwell B-1B Lancer to use the fuel. To test these two aircraft, the USAF has ordered 281,000 US gal (1,060,000 L) of FT fuel. The USAF intends to test and certify every airframe in its inventory to use the fuel by 2011. They will also supply over 9,000 US gal (34,000 L; 7,500 imp gal) to NASA for testing in various aircraft and engines. The USAF has certified

4071-470: The pyrometer filament. The true higher temperature of the black-body is then determined from Planck's Law. The absorbing medium is then removed and the current through the filament is adjusted to match the filament intensity to that of the black-body. This establishes a second calibration point for the pyrometer. This step is repeated to carry the calibration to higher temperatures. Now, temperatures and their corresponding pyrometer filament currents are known and

4140-407: The radiation from a black body cavity in solid metal specimens that were much longer than they were wide. To form such a cavity, a hole is drilled perpendicular to the long axis at the center of a rod of the material. These rods are then heated by passing a very large current through them, and the radiation emitted from the hole is observed with an optical pyrometer. The point of melting is indicated by

4209-426: The requirements for the product, such as the freezing point or smoke point. Kerosene -type jet fuel (including Jet A and Jet A-1, JP-5, and JP-8) has a carbon number distribution between about 8 and 16 (carbon atoms per molecule); wide-cut or naphtha -type jet fuel (including Jet B and JP-4), between about 5 and 15. Fuel for piston-engine powered aircraft (usually a high- octane gasoline known as avgas ) has

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4278-481: The six-hour flight from London to Doha came from Shell's GTL plant in Bintulu , Malaysia . The world's first passenger aircraft flight to use only synthetic jet fuel was from Lanseria International Airport to Cape Town International Airport on September 22, 2010. The fuel was developed by Sasol . Chemist Heather Willauer is leading a team of researchers at the U.S. Naval Research Laboratory who are developing

4347-565: 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

4416-405: 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 fuel

4485-443: The world's first 100 percent algae-derived jet fuel, Solajet, for both commercial and military applications. 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

4554-452: The world's first scheduled passenger flight flew with some synthetic kerosene from a non-fossil fuel source. 500 liters of synthetic kerosene was mixed with regular jet fuel. Synthetic kerosene was produced by Shell and the flight was operated by KLM. 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

4623-414: The world, the main exceptions being Russia and the CIS members, where TS-1 fuel type is the most common standard. 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). The differences between Jet A and Jet A-1 are twofold. The primary difference is the lower freezing point of Jet A-1 fuel: The other difference

4692-455: The worldwide consumption of jet fuel is in the US (1,398,130 barrels/day in 2012). Melting point The melting point (or, rarely, liquefaction point ) of a substance is the temperature at which it changes state from solid to liquid . At the melting point the solid and liquid phase exist in equilibrium . The melting point of a substance depends on pressure and is usually specified at

4761-495: 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

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