Katerina Swanson
Despite jet fuel and diesel having a lot in common, there are several reasons why diesel is more expensive. Firstly, the way taxes are calculated for these fuels differs, with diesel attracting heavier tax structures. Additionally, diesel engines are uncommon in aircraft today due to carbon deposit issues, and the fact that diesel may freeze or form wax crystals at low temperatures, which is a significant problem for aircraft flying at high altitudes. Jet fuel, on the other hand, has better lubricity and does not require lubricity additives, unlike diesel.
Why is diesel more expensive than jet fuel?
| Characteristics | Values |
|---|---|
| Tax | Taxes contribute to nearly 60% of the petrol retail price and 54% of the diesel retail rate. |
| Composition | Jet fuel contains more sulfur, up to 1000 ppm, which provides better lubricity. |
| Lubricity | Jet fuel is considered to be "dry" and requires lubricity additives. |
| Viscosity | Jet fuel and diesel fuel can be made with the same viscosity, but they are often made with different viscosities to suit their specific use cases. |
| Extraction | Jet fuel and diesel fuel have historically become more divergent in terms of extraction methods. |
| Production | Jet fuel is a performance specification rather than a chemical compound. |
| Specifications | Jet fuel specifications are designed to improve safety and reliability, whereas diesel specifications can vary considerably and are set on a more local level. |
| Freezing point | Jet fuel has a higher freezing point, which can reduce its availability. |
| Flash point | Jet fuel has a higher flash point, which means it is safer as it does not vaporize easily. |
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What You'll Learn
Jet fuel is defined by performance specifications, not chemical compounds
Jet fuel and diesel fuel have a lot in common. They are similar in extraction, production, and composition. Diesel fuel is a specific fractional distillate of petroleum fuel oil. Jet fuel is a mixture of various hydrocarbons. However, jet fuel is defined by performance specifications, not chemical compounds.
Jet fuel is defined as a performance specification because its composition varies widely depending on its petroleum source. The range of molecular mass between hydrocarbons is defined by the requirements for the product, such as the freezing point or smoke point. For example, Jet A fuel has a freezing point of -40 °C, while Jet A-1 has a freezing point of -47 °C. Jet B, a naphtha-kerosene fuel, has an even lower freezing point of -60 °C, which makes it useful in very cold climates like northern Canada and Alaska. However, its lighter composition also makes it more dangerous to handle.
Standards for jet fuels were first established at the end of World War II. British standards were derived from standards for kerosene lamps, while American standards were derived from aviation gasoline practices. Over time, these standards have been adjusted to balance performance requirements and fuel availability. For example, a very low freezing point reduces the availability of fuel. Jet fuel with a higher flash point, which is required for use on aircraft carriers, is more expensive to produce.
The performance specifications of jet fuel are regulated by organizations like ASTM International, the U.S. Department of Defense, and the British Ministry of Defence. These organizations establish standards for both civilian and military jet fuels, ensuring that the fuel meets the specific requirements of its intended use.
In summary, jet fuel is defined by performance specifications rather than chemical compounds because its composition can vary widely depending on its source, and its performance characteristics are more important for its intended use than its chemical makeup.
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Jet fuel has a higher flash point than diesel
Jet fuel and diesel fuel have more similarities than one might initially assume. Both fuels are comparable fractional distillates of petroleum fuel oil and have historically shared similarities in extraction, production, composition, and application. However, one key difference between the two is that jet fuel has a higher flash point than diesel.
The flash point of a volatile liquid is the lowest temperature at which it can vaporize to form an ignitable mixture in the air. Transportation regulations distinguish fuels as either flammable or combustible depending on their flash point. Flammable fuels have a flashpoint below 38°C, while combustible fuels have a flashpoint above 38°C. Diesel fuel flashpoints typically range from about 50°C to 100°C, while the flash point of jet fuel is higher than 38°C (100°F).
The higher flash point of jet fuel is an important safety feature, especially during transportation and handling. Jet fuel is typically used in gas turbine engines, which can operate with a wide range of fuels due to the injection of fuel directly into the hot combustion chamber. The higher flash point of jet fuel also helps to prevent boil-off caused by aerodynamic heating.
In contrast, diesel fuel is designed to power engines specifically built to run on diesel. The injector system in diesel engines requires lubricity additives to maintain proper functionality over an extended period. Without these refinements, the powertrain of a diesel-powered vehicle may experience accelerated wear and tear.
Although jet fuel and diesel fuel share some similarities, their distinct specifications and legal requirements make it inefficient and potentially dangerous to use them interchangeably. The higher flash point of jet fuel is an important characteristic that distinguishes it from diesel fuel and contributes to its safety profile during transportation and handling.
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Jet fuel has better lubricity than diesel
Jet fuel and diesel fuel have a lot in common in terms of extraction, production, and composition. One key difference between the two types of fuel is their lubricity, which refers to their ability to reduce friction and wear on engine components.
Jet fuel, especially Jet-A type, is considered to be very 'dry' compared to diesel fuel. Despite being a high-sulfur fuel, jet fuel has a lubricity that is acceptable for gas-turbine engines. On the other hand, diesel fuel requires the addition of lubricity additives to reduce wear and tear on engine components.
The injector system in a diesel engine, for example, requires lubricity additives to function correctly over its intended lifespan. Without these additives, the engine components are more likely to wear out prematurely. The addition of jet fuel to diesel fuel can impact the lubricity additive response, with the potential need for cetane improver treatment increasing the lubricity severity of the final diesel fuel by up to 50%.
The careful selection and use of lubricity additives are crucial, especially when blending diesel fuel with jet fuel or kerosene. The level and type of kerosene blended into diesel fuel can also impact the lubricity requirement of the final product. Therefore, refiners and blenders must assess the performance of these new blends and adjust additive treatments accordingly to ensure they meet the required specifications.
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Jet fuel is more widely available than diesel
Jet fuel and diesel fuel have a lot in common, including their extraction, production, and composition. Despite their similarities, jet fuel is more widely available than diesel fuel.
Jet fuel, also known as aviation turbine fuel (ATF), is specifically designed for use in aircraft powered by gas-turbine engines. It is a straw-colored mixture of various hydrocarbons, with a high sulfur content and low lubricity. The most commonly used types of jet fuel are Jet A and Jet A-1, which are produced according to international standards. Jet fuel is widely available to support the aviation industry, which relies heavily on this specific type of fuel.
On the other hand, diesel fuel is designed for engines built to run on diesel, such as those found in cars and trucks. While diesel fuel can be used in gas-turbine engines and vice versa, it is not ideal due to differences in specifications and legal requirements. Diesel fuel has higher lubricity than jet fuel, requiring additives to be added to the fuel or the engine to ensure proper long-term functionality.
The wider availability of jet fuel compared to diesel fuel is likely due to the specialized nature of jet fuel and the specific demands of the aviation industry. Aircraft are designed to run on jet fuel, and the aviation industry works closely with refineries to optimize the yield of jet fuel, ensuring its consistent availability.
Additionally, jet fuel is exempt from certain taxes that are applied to diesel fuel. In some regions, such as India, the central and state government taxes contribute to a significant portion of the retail price of diesel, making it more expensive than jet fuel. This discrepancy in taxation further contributes to the wider availability of jet fuel, as it is more cost-effective for suppliers and consumers.
Overall, while jet fuel and diesel fuel share similar characteristics, jet fuel is more widely available due to its specialized use in aviation, the optimization of refining processes, and favorable taxation policies.
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Diesel engines are more fuel-efficient than avgas engines
Although jet fuel and diesel fuel are similar in terms of extraction, production, and composition, they are designed for different types of engines. While diesel engines are more fuel-efficient than avgas engines, they produce more pollutants, including 13% more CO2 and higher levels of nitrogen oxides (NOx).
Diesel engines are about 20% more thermally efficient than gas engines. They can convert more of the fuel's energy into power because diesel fuel is thicker and has a higher energy density. This higher thermal efficiency means diesel engines can handle heavier loads and have better fuel economy. For example, diesel engines can achieve up to 20-30% better fuel efficiency compared to similar gasoline models.
The higher energy density of diesel fuel means that diesel engines can travel farther on a single tank. This makes diesel engines ideal for long-distance travel and commercial vehicles, where efficiency and range are critical. Additionally, diesel engines generate more torque, which further improves fuel economy and acceleration.
The resale value of diesel engines is also higher due to their longer lifespan and durability. They are built to withstand higher pressures and typically last longer than gasoline engines, requiring less maintenance. However, diesel engines need to warm up, especially in cold weather, to reach their standard operating temperature and ensure optimal performance.
While diesel engines offer improved efficiency over gas engines, they emit more harmful pollutants. However, modern technology, such as catalytic converters, helps reduce these emissions and protect the environment.
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Frequently asked questions
Diesel is more expensive than jet fuel due to the higher taxes imposed on it. In India, for example, central and state government taxes contribute to nearly 54% of the diesel retail price.
The main difference between diesel and jet fuel is their composition. Jet fuel contains more sulfur, which provides better lubricity, whereas diesel requires lubricity additives to function correctly over time.
While jet fuel is generally cheaper than diesel, this is not always the case. Jet fuel can be more expensive, especially when it is of a higher grade, such as the Jet-A type.
While jet fuel and diesel fuel are similar in many ways, they are designed for different types of engines. Using jet fuel in a diesel engine or diesel fuel in a jet engine can be highly inefficient and even dangerous. However, there have been rare cases where diesel fuel has been used successfully in jet engines and vice versa.
