Mercedes Mullins
The weight of aviation fuel is an important consideration for flight load calculations, so it's no surprise that it's typically sold by weight rather than volume. Jet fuel is a carefully refined, kerosene-based fuel used in aviation turbine engines. The density of jet fuel varies depending on its components and temperature, but as a rule of thumb, one US gallon weighs about 6.47-7.01 pounds at 59°F (15°C). This is a slightly lower weight than diesel fuel, which weighs around 7-7.1 pounds per gallon.
| Characteristics | Values |
|---|---|
| Weight of 1 gallon of avionic fuel | 6.47-7.01 pounds at 59°F (15°C) |
| Density of Jet A grade fuel | 0.775 g/ml to 0.840 g/ml at 59°F (15°C) |
| Density of Jet A1 grade fuel | 0.78-0.84 g/ml at 59°F (15°C) |
| Weight of 1 gallon of diesel fuel | 7-7.1 pounds |
| Weight of 1 gallon of gasoline | 6.0 pounds |
| Weight of 1 gallon of kerosene | 6.51-6.84 pounds |
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What You'll Learn
Jet fuel is sold by the pound, not gallon
Jet fuel is sold by the pound, not by volume in gallons, as weight is critical for flight load calculations. The weight of jet fuel varies depending on factors like its components and temperature. The density of jet fuel is 0.78-0.84 g/ml at 59°F, which is equal to 6.47-7.01 pounds per gallon. This means that one US gallon of jet fuel weighs about 6.47-7.01 pounds at 59°F.
The industry standard of selling jet fuel by the pound came about following the famous 'Gimli Glider' accident, Air Canada 143, a Boeing 767 that ran out of fuel in 1983. Part of the problem was confusion in ordering fuel in kilograms, which could be measured in litres, and then converting it into pounds for operation.
Using pounds as the standard unit of measurement for jet fuel has several advantages. Firstly, it eliminates the need for unit conversion, which can be complex and time-consuming, especially during busy or stressful events. Additionally, pounds are commonly used in fuel totalizers and calculations, making it a universal standard in fuel units.
To convert jet fuel from pounds to gallons mentally, you can use a simple three-step process. First, take the total weight of the fuel and drop the last zero. Second, divide that number in half. Finally, add the two numbers together to get the approximate number of gallons. For example, 8,000 lbs of jet fuel is approximately equal to 1,200 gallons.
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Jet fuel weighs 6.47-7.01 pounds per gallon
Avionic fuel, or jet fuel, is typically sold by the pound rather than by the gallon. This is because the weight of the fuel is important for flight load calculations. Jet fuel is a carefully refined, kerosene-based fuel used in aviation turbine engines.
Jet fuel has an approximate density of 0.78-0.84 g/ml at 59°F (15°C), which translates to 6.47-7.01 pounds per gallon. Jet A1 fuel is slightly denser than Jet A grade fuel, but the difference is not significant. As a comparison, one gallon of diesel fuel weighs 7-7.1 pounds, and a gallon of gasoline is even heavier.
The weight of jet fuel can vary depending on its components and temperature. For example, jet fuel has a different weight at 59°F than it does at 60°F. Therefore, these calculations are not exact and the current day's fuel temperature should be taken into account for precise measurements.
To quickly calculate how many US gallons are in a given weight of jet fuel, drop the last zero from the total weight of the fuel. Divide that number in half and add the two numbers together. For example, 8,000 lbs of jet fuel is approximately equal to 1,200 gallons.
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Jet A1 is denser than Jet A
The weight of jet fuel varies depending on factors like its components and temperature. Jet fuel is typically sold by the pound rather than by the gallon. As a rule of thumb, one US gallon of jet fuel weighs about 6.47-7.01 pounds at 59°F (15°C).
Jet A1 and Jet A are the two main types of jet fuel, each with its own manufacturing specifications. Jet A1 is the most common jet fuel used globally, while Jet A is predominantly used in the United States. Jet A1 is slightly denser than Jet A, although the difference is not significant. According to ASTM D1655 (2004) specifications, the density of both Jet A and Jet A1 jet fuels must fall within the range of 0.775 g/ml to 0.840 g/ml at 59°F (15°C). This equates to 775 kg/m3 to 840 kg/m3.
Jet A1 has a lower freezing point than Jet A, which is advantageous in colder climates. Additionally, Jet A1 fuel contains static dissipater additives, while Jet A does not. These additives give Jet A1 its antistatic properties, which are crucial for flight safety.
The density of jet fuel is critical to ensuring safe flight operations. Water contamination in jet fuel, for example, can lead to hazardous situations. During flight, the temperature of the fuel in the tanks decreases due to the low temperatures in the upper atmosphere. This causes the dissolved water to separate from the fuel and drop to the bottom of the tank. If the supercooled water droplets collide with a surface, they can freeze and block fuel inlet pipes, as seen in the British Airways Flight 38 accident.
In summary, Jet A1 is denser than Jet A, and this minor difference in density has important implications for the safety and performance of aircraft using these fuels.
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Jet fuel is refined from kerosene
The weight of one gallon of jet fuel depends on various factors, such as its components and temperature. Jet fuel is typically sold by the pound, with one US gallon weighing around 6.47 to 7.01 pounds at 59°F (15°C). Jet fuel is a carefully refined, kerosene-based fuel used in aviation turbine engines. It is a colourless liquid produced from crude oil in a petroleum refinery.
Kerosene-based jet fuel has a much higher flash point than gasoline-based fuel, requiring significantly higher temperatures to ignite. This type of jet fuel includes Jet A and Jet A-1, JP-5, and JP-8, with a carbon number distribution of about 8 to 16 carbon atoms per molecule. Jet A and Jet A-1 are the most commonly used jet fuels, produced to meet standardized international specifications. Jet A-1 is the predominant jet fuel used globally, while Jet A is primarily used in the United States.
The refining process for jet fuel involves mixing crude oil with a small quantity of additives. The specific additives used depend on the type of jet fuel being produced. For example, Jet A-1 contains static dissipater additives, contributing to its enhanced performance in cold weather. Jet A, on the other hand, has a higher freezing point and is designed to burn at temperatures of 49°C (120°F) or above.
Jet fuel is defined by its performance specifications rather than as a chemical compound due to the variation in its composition based on the petroleum source. Its density at 15°C can range from 775 kg/m3 to 840 kg/m3, with Jet A-1 being slightly denser than Jet A. This density range is specified by ASTM D1655 (2004) to ensure the fuel's performance and safety.
The weight of jet fuel is crucial for flight load calculations, and its density can impact the overall fuel consumption of an aircraft. Aircraft manufacturers use a density of around 0.80 kg/L (6.7 lb/US gal) in their performance calculations, which is slightly lower than the commonly accepted density range of jet fuel.
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Jet fuel weight varies by components and temperature
Jet fuel is a mixture of various hydrocarbons, with the exact composition varying based on the petroleum source. Kerosene-based jet fuel contains over 260 aliphatic and aromatic hydrocarbon compounds, including toxicants such as benzene, n-hexane, and toluene. The range of molecular mass between hydrocarbons is defined by the product's requirements, such as freezing or smoke points. For example, Jet A and Jet A-1 are standardized fuels commonly used in commercial aviation, while Jet B is designed for improved cold-weather performance.
Due to the diverse sources and compositions of jet fuel, it is defined by performance specifications rather than as a chemical compound. The specific hydrocarbons and additives included in jet fuel can vary, with some additives being necessary for military aircraft engine fuel systems. For instance, certain fuels have been developed for sustained flight at high speeds, requiring a lower freezing point and improved thermal oxidative stability.
The weight of jet fuel is influenced by its density, which varies with temperature. As the temperature increases, the volume of jet fuel also increases. This relationship between density and temperature is illustrated through tools based on ASTM D 1250-04 and IP 200/04 standards. These tools provide colored lines representing different jet fuels, allowing users to determine the density at a given temperature.
To calculate the weight of jet fuel, one can multiply its volume by density, considering the fuel's temperature and altitude. This calculation is crucial in aviation, as the weight of the fuel directly impacts the aircraft's performance, including takeoff and landing, cruising speed, range, and rate of climb. Therefore, accurate assessments of jet fuel weight are essential for flight operations and safety.
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Frequently asked questions
One US gallon of jet fuel weighs about 6.47-7.01 pounds at 59°F.
Jet fuel is a carefully refined, kerosene-based fuel used in aviation turbine engines. It is typically sold by the pound rather than by the gallon.
The weight of jet fuel can be calculated using the formula: weight x 0.5 + weight x 0.1 = gallons. For example, 8,000 lbs of jet fuel x 0.5 + 8,000 lbs of jet fuel x 0.1 = 1,200 gallons.
Jet A1 is the most commonly used jet fuel to power jet aircraft and is the standard fuel grade for international aviation.
