Mercedes Mullins
While smoking near diesel fuel is not advisable, it is unlikely to cause an explosion. Diesel is a type of fuel derived from crude oil and has a higher boiling point than gasoline, which means it requires a lot of pressure and heat to ignite. However, diesel engines can produce smoke, which indicates a problem with the engine. Different colours of smoke indicate different issues, for example, black smoke indicates poor and incomplete combustion of diesel fuel, while blue smoke can indicate reduced oil control. Exposure to diesel exhaust, mainly through inhalation, can occur at work, around the home, or while travelling, and may pose health risks.
| Characteristics | Values |
|---|---|
| Smoke from a diesel engine | Indicates a problem with the engine |
| Blue smoke | Reduced oil control, fouling deposits around piston rings, or cylinder glaze |
| Black smoke | Incomplete combustion of diesel fuel, high carbon or soot content |
| White smoke | Water in the fuel, a 'rich mixture' caused by too much fuel being injected |
| Diesel fumes | Carry health risks, including exposure to carcinogens |
| Diesel ignition | Requires high pressure, temperature, and constant ignition |
| Diesel vapourisation | Occurs at around 80°C, unlike petrol which vapourises at a much lower temperature |
| Diesel exhaust | Made up of gases and soot particles, including carbon dioxide, carbon monoxide, nitric oxide, nitrogen dioxide, sulfur oxides, and hydrocarbons |
| Exposure to diesel exhaust | Highest near heavy diesel traffic, industrial sites, railroads, ports, and in lower-income neighbourhoods |
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What You'll Learn
Smoking around diesel fuel is dangerous due to the fumes
While diesel fuel is harder to ignite than gasoline, it is still possible for it to catch fire. Diesel fumes are more likely to ignite than gasoline fumes, and it only takes a small amount of heat for diesel to combust. Therefore, smoking around diesel fuel is dangerous as the fumes could ignite.
Diesel fuel is a type of fuel derived from crude oil. It is used in most large engines, including those in many trucks, buses, trains, and ships, as well as in construction, farm, and mining equipment, generators, and some cars. As such, people can be exposed to diesel exhaust at work, around the home, or while traveling, mainly by breathing it in. Exposures are highest where diesel traffic is heaviest, such as along major highways and in cities. People living near industrial sites, railroads, or ports might also be exposed to higher levels.
The gas portion of diesel exhaust is made up mostly of carbon dioxide, carbon monoxide, nitric oxide, nitrogen dioxide, sulfur oxides, and hydrocarbons. Exposure to diesel exhaust may be higher while traveling in a car or other vehicle, especially when on roads with heavier truck or bus traffic. Commuting for work is a potential source of diesel exhaust exposure for many people, and children riding in school buses may also be exposed as the buses typically run on diesel fuel.
Due to the health risks associated with diesel exhaust, it is important to take precautions when working around diesel fuel. If you work in or around vehicles that run on diesel fuel, limiting the time spent near idling engines may help lower your exposure to fumes. Personal protective equipment, such as respirators, may also be necessary to adequately protect yourself. Workplace changes such as ventilating the exhaust away from where people breathe might also be important.
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Diesel fuel vapours ignite more readily than petrol
While diesel fuel is combustible and can ignite, it is less flammable than gasoline. This is because diesel has a higher flash point—the minimum temperature at which a liquid gives off sufficient vapour to form an ignitable mixture with air. Diesel fuel has a flashpoint of over 100 degrees Fahrenheit, while gasoline has a lower flashpoint, giving it the technical term "flammable".
Gasoline is extremely flammable and can ignite with a small spark. It readily vaporizes at room temperature, creating a mixture that is ready for combustion. These vapours are 3 to 4 times heavier than air and can travel great distances along the ground, accumulating in low or enclosed spaces. This means that gasoline vapours can then be ignited by a nearby open flame, such as a pilot light, and cause fires or explosions.
On the other hand, diesel fuel does not give off vapours as easily and requires intense pressure or a sustained flame to ignite. This is because diesel has a longer hydrocarbon chain, and its molecules are heavier, so it does not vaporize as readily at normal temperatures.
While it is possible to ignite diesel fuel, it is generally safer than gasoline in terms of its flammability and the risk of accidental ignition.
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Diesel exhaust is harmful to health
While smoking around diesel fuel may not pose an immediate risk of explosion, it is still highly discouraged as diesel exhaust is harmful to health.
Diesel exhaust is made up of gases and soot particles, which are themselves made up of many different substances. The gas portion of diesel exhaust typically includes carbon dioxide, carbon monoxide, nitric oxide, nitrogen dioxide, sulfur oxides, and hydrocarbons. The soot is an undesirable product of diesel combustion, high in carbon or unburnt fuel that blows out of the combustion chamber and mixes with the exhaust gases.
People can be exposed to diesel exhaust at work, around the home, or while traveling, primarily by breathing it in. Exposure is highest where diesel traffic is heaviest, such as along major highways and in cities, and for people living near industrial sites, railroads, or ports. Even commuting for work can be a source of exposure, especially on roads with heavier truck or bus traffic. This is a particular concern for children riding in school buses, as the buses typically run on diesel fuel.
To reduce exposure to diesel exhaust, it is recommended to limit the time spent near idling engines and to use personal protective equipment such as respirators. Workplace changes such as ventilating the exhaust away from breathing areas may also be important.
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Diesel smoke indicates a problem with the engine
The presence of smoke indicates a problem with the diesel engine. A diesel engine in good condition should not produce any visible smoke from the exhaust under most operating conditions. If smoke is visible, it could be an indication of a serious problem with the engine.
There are three colours of smoke that can be emitted from a diesel engine: white, black, and blue. White smoke is usually caused by frozen deposits of soot that expand around the rings and burn away once the engine is warmed up. It can also be caused by unburned diesel fuel, which can irritate the eyes and skin. Black smoke is the most common smoke colour emitted from diesel engines and is caused by poor and incomplete combustion of diesel fuel. This can be due to carbon buildup, a worn component, or a faulty system, resulting in too much fuel in the chamber. Blue smoke is an indication of oil being burnt, which can be due to reduced oil control or wear in power assemblies.
The presence of smoke can also indicate more serious problems with the engine, such as piston seizure, valve or turbocharger failure, or a needed engine rebuild. In some cases, the problem may be as simple as a clogged fuel injector or dirty air filter, which can be easily cleaned or replaced. However, it is important to identify and fix the problem as early as possible to avoid further damage and unnecessary costs.
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Blue, white, and black smoke indicate different issues
Blue smoke suggests an oil-related issue, with oil going through the combustion chamber. This could be due to worn valve guides, valve seals, or a broken piston ring/cylinder seal. It may also be caused by changes in the type or grade of oil used. Blue smoke is often evident at a cold start and can reflect reduced oil control due to fouling deposits. While engines with good sound compression can burn a lot of oil without blue smoke, it is still not desirable.
White smoke can be caused by either excess fuel or an internal coolant leak in the engine. It often occurs when raw, unburnt diesel passes into the exhaust due to defective injectors, poor cylinder compression, or issues with injection timing. White smoke is commonly seen at cold start-up, especially in colder climates, and should disappear as the engine warms up. If it persists, it may indicate a serious fuel injection problem.
Black smoke is the most common type of smoke emitted from diesel engines. It indicates poor and incomplete combustion of diesel fuel, often due to excess fuel or a partial restriction in airflow. This can be caused by several factors, including fuel injectors sticking, poor turbo performance, dirty air filters, or issues with the injection pump. Black smoke is high in carbon or soot, which is an undesirable product of diesel combustion.
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Frequently asked questions
Yes, it is dangerous to smoke around diesel fuel. Diesel fumes pose immediate health risks, and there is a risk of the fumes igniting.
Exposure to diesel exhaust may increase your risk of cancer. People can be exposed to diesel exhaust at work, around the home, or while travelling.
If you work in or around vehicles that run on diesel fuel, limiting the time spent near idling engines may help lower your exposure to fumes. Personal protective equipment, such as respirators, may also be necessary.
