Regan Brown
Jet fuel and diesel fuel are both petroleum-based fuels that are used for transportation. Jet fuel is a performance specification defined by the requirements for the product, such as the freezing point or smoke point. Diesel fuel, on the other hand, is designed to power engines built specifically to run on diesel. While jet fuel is typically used for aviation, it can also be used in diesel engines in some cases. The main differences between the two fuels lie in their composition, extraction, and broader use. Jet fuel tends to be more expensive than diesel fuel, but it is more widely available globally.
| Characteristics | Values |
|---|---|
| Definition | Jet fuel is a performance specification, whereas diesel fuel is a specific fractional distillate of petroleum fuel oil. |
| Composition | Jet fuel and diesel fuel are both made from crude oil but have different compositions and applications. |
| Extraction | Jet fuel and diesel fuel have different extraction processes. |
| Usage | Jet fuel is designed for turbine engines in aircraft, while diesel fuel is designed for engines built specifically for diesel. |
| Performance | Jet fuel has a higher flash point than diesel fuel, making it safer to handle in large quantities. |
| Lubricity | Jet fuel has poorer lubricating ability than diesel fuel, which can increase wear on fuel injection equipment. |
| Sulfur Content | Jet fuel contains more sulfur than diesel fuel, which improves lubricity and eliminates the need for lubricity additives. |
| Cost | Jet fuel is more expensive than diesel fuel, but using a single fuel type can provide logistical advantages that offset the extra cost. |
| Environmental Impact | Jet fuel and diesel fuel contribute to air pollution and climate change. Jet fuel contains lead, which has significant health and environmental impacts. |
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What You'll Learn
Jet fuel can be used in diesel engines in some cases
Jet fuel and diesel fuel are both petroleum-based fuels derived from crude oil. They are similar in nature and, in some cases, jet fuel can be used in diesel engines.
Jet fuel is defined as a performance specification rather than a chemical compound. The range of molecular mass between hydrocarbons is defined by the requirements for the product, such as the freezing point or smoke point. Kerosene-type jet fuels, including Jet A and Jet A-1, have a carbon number distribution between about 8 and 16 (carbon atoms per molecule). Diesel fuel, on the other hand, is designed to power engines specifically built to run on diesel fuels.
Despite their similarities, there are some key differences between jet fuel and diesel fuel. Jet fuel has a higher flash point, making it safer to handle in large quantities, and it is more widely available globally. Additionally, jet fuel tends to have poor lubricating ability compared to diesel, which can increase wear on fuel injection equipment. An additive may be required to improve its lubricity. Jet fuel also has a higher sulfur content, which can impact its performance and emissions.
In certain situations, jet fuel is used to power diesel engines, particularly in ground-support vehicles at airports. This simplifies airport logistics by reducing the number of fuel types required. Aircraft engine manufacturers, such as Thielert and Austro Engine, have also begun offering aircraft diesel engines that run on jet fuel. While jet fuel may be used in diesel engines, it is not ideal due to the lack of specific additives that diesel engines are designed for.
Overall, while jet fuel can be used in diesel engines in some cases, there are advantages and disadvantages to consider, including performance, emissions, and equipment compatibility.
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Jet fuel is more expensive than diesel fuel
Jet fuel and diesel fuel are similar in that they are both specific fractional distillates of petroleum fuel oil. However, jet fuel is more expensive than diesel fuel. This is due to a variety of factors, including the different applications and uses of the two fuels, as well as their chemical compositions.
Jet fuel, also known as aviation turbine fuel (ATF or avtur), is specifically designed to power gas-turbine engines in aircraft. While diesel fuel is also capable of powering aircraft engines, it is typically used in engines specifically built to run on diesel, such as diesel cars and trucks. The use of jet fuel in aviation is subject to strict standards and regulations, which can contribute to its higher cost.
One of the main differences between jet fuel and diesel fuel is their composition. Jet fuel tends to have higher sulfur content, up to 1,000 ppm, which gives it better lubricity. This high sulfur content is acceptable for gas-turbine engines in aircraft. On the other hand, diesel fuel often requires the addition of lubricity modifiers or additives to improve its lubricating ability, especially in diesel engines. The need for additives can drive up the cost of diesel fuel relative to jet fuel.
Another factor contributing to the higher cost of jet fuel is its availability and logistics. Jet fuel is widely available worldwide, whereas diesel fuel may have more limited distribution networks. Additionally, the use of a single fuel type, such as jet fuel, at airports and airfields can simplify logistics and reduce the need for separate fuel infrastructures, offsetting the higher cost of jet fuel.
While jet fuel is generally more expensive than diesel fuel, it is important to consider the specific context and application. In certain cases, such as in ground-support vehicles at airports, the logistical advantages of using jet fuel can outweigh its higher price. Additionally, the performance specifications and requirements of the fuel, such as freezing point or smoke point, can also impact its cost.
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Jet fuel has poor lubricating ability compared to diesel
Jet fuel and diesel fuel are similar in many ways. Both are specific fractional distillates of petroleum fuel oil, and both can be used in diesel engines. However, jet fuel has a higher sulphur content than diesel, which means it has better lubricity and does not require a lubricity additive, unlike diesel.
Despite this, jet fuel is considered to be "dryer" than diesel fuel. This means that jet fuel has a poor lubricating ability compared to diesel, which increases wear in fuel injection equipment. This is because the injector system in a diesel engine needs lubricity additives to work correctly over a long period.
The lubricating ability of jet fuel has decreased over time due to the introduction of EPA regulations that have limited the sulphur content of jet fuel. This has resulted in refineries hydrotreating their jet fuel production, reducing its lubricating abilities.
The use of jet fuel in diesel engines can cause long-term wear and tear on the engine's components, including the pumps, injectors, and other powertrain parts. This is due to the difference in lubricity between the two types of fuel, with jet fuel lacking the additives that diesel engines are designed for.
Overall, while jet fuel and diesel fuel have many similarities, the poor lubricating ability of jet fuel compared to diesel can have negative consequences for diesel engines, highlighting the importance of using the correct fuel type for each engine.
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Jet fuel has more sulphur than diesel
Jet fuel and diesel fuel are chemically very similar, and jet fuel can be used in some diesel engines. However, jet fuel contains more sulphur than diesel—up to 1,000 ppm—and has better lubricity, meaning it does not currently require a lubricity additive, unlike diesel fuels. Sulphur is a naturally occurring element that is tasteless and odourless in its natural form, and it is a key component in many amino acids and proteins that are essential to life on Earth. However, sulphur in diesel is known to cause damage to both engine components and air quality following combustion.
In recent years, Ultra Low Sulfur Diesel (ULSD) has been introduced, containing dramatically lower levels of sulphur than common diesels—a maximum of just 10 milligrams per kilogram. This has helped to reduce engine wear and address the issues of sulphuric acid concentrations in exhaust emissions. Environmental regulations have limited sulphur levels in diesel fuels, with a maximum sulphur level of 15 ppm available for highway use as of June 2006. This fuel is referred to as "ultra-low sulfur diesel" (ULSD) and was implemented to enable catalyst-based emission control devices to meet the 2007-2010 emission standards for heavy-duty engines.
Similarly, the aviation industry is exploring the use of ultra-low sulfur jet fuels to reduce aircraft emissions and their adverse health impacts. Transitioning to ultra-low sulfur jet fuel is estimated to prevent 1,000 to 4,000 premature mortalities per year if implemented globally. However, desulfurization of jet fuel may increase globally averaged climate warming caused by aviation by 1-8% due to increased CO2 emissions during the hydrodesulfurization process.
While jet fuel contains more sulphur than diesel, the aviation industry is taking steps to reduce its sulphur content for environmental and health reasons.
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Jet fuel is a performance specification
Jet fuel is defined as a performance specification rather than a chemical compound. The range of molecular mass between hydrocarbons (or different carbon numbers) is defined by the requirements for the product, such as its freezing or smoke point.
Jet fuel is a mixture of hydrocarbons, and its exact composition varies based on its petroleum source. Jet A and Jet A-1 are the most commonly used jet fuels for commercial aviation and are produced to a standardized international specification. Jet B is another type of jet fuel used for its enhanced cold-weather performance. It has a very low freezing point of −60 °C (−76 °F) and is primarily used in northern Canada and Alaska.
The performance specifications of jet fuel are adjusted to balance performance requirements and fuel availability. For example, very low freezing points reduce fuel availability, and higher flash point products required for aircraft carriers are more expensive to produce. ASTM International produces standards for civilian fuel types in the United States, while the U.S. Department of Defense produces standards for military use.
Jet fuel is similar to diesel fuel and can be used in some diesel engines. However, jet fuel has poorer lubricating abilities compared to diesel, which can increase wear on fuel injection equipment. Jet fuel is also more expensive than diesel. Despite these differences, using jet fuel in diesel engines can be economically viable in certain situations, such as in ground-support fleets at airports, as it eliminates the need for separate fueling infrastructure.
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Frequently asked questions
Jet fuel is a performance specification defined by the requirements for the product, such as the freezing point or smoke point. It is a type of aviation fuel used to power gas-turbine engines.
Diesel fuel is a specific fractional distillate of petroleum fuel oil designed to power engines built to run on diesel fuels.
No, they are not the same, but they are very similar and jet fuel can be used in some diesel engines. They are both made from the same base petroleum distillate but have different additives.
The main differences between jet fuel and diesel fuel are their composition, extraction, application, and broader use. Jet fuel tends to have poorer lubricating abilities compared to diesel, and it is also more expensive.
Yes, jet fuel can be used in some diesel engines. However, jet fuel has poorer lubricating abilities compared to diesel, which can increase wear in fuel injection equipment. An additive may be required to restore its lubricity.
