Katerina Swanson
Marine diesel fuel, also known as bunker fuel, is a type of diesel fuel used in watercraft diesel engines. Diesel fuel is specifically designed for diesel engines, which ignite fuel without a spark through the compression of inlet air and injection of fuel. Marine diesel fuel is typically heavier and has a higher sulfur content compared to regular diesel fuel. In the past, leaded gasoline was commonly used in marine vessels due to its ability to increase engine compression and enhance vehicle performance. However, due to health and environmental concerns, the use of leaded gasoline has been largely phased out, with most countries banning its use in automotive fuel. Today, marine diesel fuel is typically dyed to differentiate it from other types of diesel fuel, and it continues to be an important source of power for marine craft.
Characteristics and Values of Diesel Fuel for Marine Use
| Characteristics | Values |
|---|---|
| Type of Fuel | Liquid fuel designed for diesel engines |
| Other Names | Marine diesel, bunker fuel, heavy fuel, diesel oil, heavy oil |
| Colour | Blue |
| Sulphur Content | Ultra-low |
| Use | Used in watercraft diesel engines |
| Tax | Lower than on-road diesel |
| Microbe Growth | Possible in warmer temperatures |
| Health Impact | Causes health damage, especially from older engines |
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What You'll Learn
- Marine diesel is dyed blue, while road diesel is untaxed and dyed red
- Marine diesel is also called bunker fuel, and is heavier than road diesel
- Leaded gasoline was phased out in the US due to health and environmental concerns
- Leaded gasoline was replaced by mid-grade (unleaded) gasoline in the 1980s
- Leaded gasoline was widely used as it improved engine compression and fuel economy
Marine diesel is dyed blue, while road diesel is untaxed and dyed red
Firstly, the taxation on diesel fuel varies depending on its intended use. Untaxed diesel, also known as red diesel, is used for agricultural vehicles, home heating tanks, refrigeration units, and marine craft. Using this untaxed diesel fuel for typical taxed purposes, such as driving, can result in significant fines. On the other hand, taxed road diesel, also known as white diesel, is intended for use in diesel-engined road vehicles and is subject to higher taxation.
Secondly, the emission standards for marine diesel may differ from those for road diesel. On-road diesel fuel is typically ultra-low sulfur to meet emissions requirements. However, it is unclear whether marine diesel applications are held to the same standards. Historically, high-sulfur diesel was dyed blue, but this practice was discontinued in 1994 when all non-road diesel was mandated to be dyed red.
It is worth noting that the colour of diesel fuel is not indicative of its quality or suitability for a particular use. While marine diesel is often dyed blue, and road diesel may appear clear or yellow, these colours are not universal indicators. Fuel classification and standards are what truly matter when determining the appropriate use of diesel fuel.
Additionally, it is important to address the misconception that leaded fuel is commonly used in marine vessels. While some sources suggest that leaded fuel may still be in use, the majority of diesel engines today run on ultra-low-sulfur diesel (ULSD), which has significantly reduced sulfur content. This type of diesel fuel is widely available in countries like the United Kingdom, mainland Europe, and North America.
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Marine diesel is also called bunker fuel, and is heavier than road diesel
Marine diesel, also called bunker fuel, is used by maritime boats and ships. The name "bunker fuel" is thought to come from the storage area within a boat or ship where the fuel is stored, known as the fuel bunker.
Marine diesel is heavier than road diesel. It is a heavy fuel oil that is widely used by large commercial ocean-going vessels. It is characterised by its boiling point, carbon-chain length, and viscosity, which contribute to its value. Marine diesel is considered a low-sulfur fuel oil (LSFO), and its use is regulated by the International Maritime Organization (IMO), which has implemented a global sulphur cap on marine fuel emissions to reduce the amount of sulfur oxide in the air.
Historically, marine diesel and on-road diesel were virtually the same, except for the red dye used to identify marine diesel for tax purposes. In 2006-2007, ultra-low sulfur diesel fuel regulations were introduced, creating a divergence between on-road and off-road diesel. On-road diesel fuel was limited to 15 parts per million of sulfur content, while off-road diesel, including marine diesel, was allowed to retain a higher sulfur content. This higher sulfur content in marine diesel provided better resistance to microbes in storage and improved lubricity.
However, in recent years, there has been a transition towards ultra-low sulfur diesel (ULSD) in the marine sector. In 2022, the IMO implemented new environmental regulations, drastically reducing the allowable sulfur content in marine fuels. This change led to an increased demand for ULSD and a surge in diesel prices.
The use of alternative fuels, such as LNG, hydrogen, or biofuels, and new marine technologies may impact the demand and pricing of traditional marine diesel fuel in the long term.
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Leaded gasoline was phased out in the US due to health and environmental concerns
By the 1970s and 1980s, wealthy countries, including the US, began phasing out leaded gasoline due to health and environmental concerns. In 1973, the US Environmental Protection Agency (EPA) started an effort to phase out leaded gasoline. This was done under the authority of the Clean Air Act, which was adopted by the US Congress in 1970. The Act established standards for the amount of lead allowed in motor gasoline and standards for automobile emissions of carbon monoxide, nitrogen oxides, and hydrocarbons.
The automobile industry responded to the emissions standards by developing catalytic converters, which convert carbon monoxide, nitrogen oxides, and hydrocarbon emissions into less harmful substances. However, leaded gasoline damages catalytic converters, which led to its ban for vehicles beginning with model-year 1975. Despite the ban for vehicles, leaded gasoline is still allowed for aircraft, racing cars, farm equipment, and marine engines.
The phase-out of leaded gasoline has had significant benefits for global health and the environment. The United Nations estimates that the global phase-out of leaded gasoline has saved $2.44 trillion per year, improved health, lowered crime rates, and prevented more than 1.2 million premature deaths.
Diesel Fuel: Powering Vehicles and More
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Leaded gasoline was replaced by mid-grade (unleaded) gasoline in the 1980s
Diesel fuel is any liquid fuel specifically designed for use in a diesel engine. It is typically a fractional distillate of petroleum fuel oil, but can also be derived from non-petroleum sources such as biodiesel, biomass-to-liquid (BTL), or gas-to-liquid (GTL) diesel.
In the early days of gasoline, lead was commonly added to the fuel in the form of "Ethyl Fluid", which contained tetraethyllead (TEL) blended with other chemicals to prevent lead buildup in engines. However, as early as the 1920s, there were concerns about the health effects of lead exposure, and brief bans on its use were implemented. Despite this, leaded gasoline remained prevalent, and by the 1960s and 1970s, it was still commonly used, with some people even sniffing or tasting the fuel. During this time, unleaded gasoline began to emerge as an alternative, and new cars with catalytic converters that required unleaded fuel started to enter the market.
In the 1980s, efforts to reduce the use of lead in gasoline intensified, led by the United States Environmental Protection Agency (EPA). Mid-grade unleaded gasoline was introduced in 1986 as the United States began phasing out leaded gasoline. Most gasoline stations offered three grades of gasoline: leaded, unleaded, and unleaded premium (high-test). With the declining sales of leaded gasoline, stations introduced mid-grade unleaded as an option for motorists seeking higher octane fuel than regular unleaded. This transition allowed stations to continue utilizing all three pumps for the different grades of gasoline.
By 1988, leaded gasoline was made illegal in the United States, and other countries also began to phase out its use. Japan became the first country to completely ban leaded gasoline in 1986. In the European Union and the United Kingdom, unleaded fuel was mandated for all new gasoline-powered cars sold starting in 1993. While leaded gasoline was removed from forecourts in the UK by 2000, it continued to be used in parts of the world, with some countries only phasing it out in the 2010s. As of 2021, only a few countries, such as Algeria, Iraq, and Yemen, still had widespread use of leaded gasoline, and even these nations have since transitioned away from it.
Today, unleaded gasoline is the standard, and modern high-octane blends have eliminated the need for compression ratio adjustments in vehicles. While leaded gasoline has been largely eradicated for road vehicles, it still persists in small amounts in aviation gasoline for piston-engine aircraft, with efforts ongoing to find economically feasible replacements.
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Leaded gasoline was widely used as it improved engine compression and fuel economy
Leaded gasoline, also known as tetraethyl lead (TEL), was widely used as a fuel additive for much of the 20th century. It was first added to gasoline in the 1920s, and its use continued until it was gradually phased out in the 1970s due to growing awareness of its negative health effects.
TEL improved engine compression and fuel economy through several mechanisms. Firstly, it increased the octane rating of gasoline, allowing engine compression to be raised substantially. This, in turn, increased vehicle performance and fuel efficiency. The higher compression ratios resulted in greater engine power and efficiency. Additionally, TEL acted as an antiknock agent, reducing engine knock or pre-ignition. This helped to prevent uncontrolled combustion and improve ignition timing.
Furthermore, TEL helped protect against valve-seat recession, a common issue in high-rpm, high-heat, and high-load conditions. Valve-seat recession occurs when the intensely hot exhaust valve momentarily fuses with the valve seat due to microwelding. TEL helped cool the intake valves and served as a buffer against microweld formation. Once the valves reopened, the microwelds would pull apart, preventing valve recession and maintaining engine compression and power.
Despite the benefits of TEL in improving engine compression and fuel economy, its use came at a significant cost to public health. Lead had been known to cause poisoning and various ailments for thousands of years. Cases of lead poisoning were reported among workers exposed to lead during its production, and there were concerns about the health implications of leaded gasoline fumes in cities.
Today, unleaded gasoline is commonly used, and vehicles previously designed to run on leaded fuel often require modifications for compatibility with unleaded fuel.
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Frequently asked questions
Diesel fuel, also called diesel oil, heavy oil, or simply diesel, is a liquid fuel used in diesel engines. Diesel engines ignite fuel by compressing it with air, eliminating the need for an electric spark.
Marine diesel, also called bunker fuel, is a type of diesel fuel used in watercraft diesel engines. Marine diesel is dyed blue in the US.
No, marine diesel is not leaded. Leaded gasoline was phased out in the US and many other countries due to health and environmental concerns.
Leaded gasoline, also known as tetraethyl lead (TEL), was a type of fuel containing lead additives to increase engine compression and improve vehicle performance. However, TEL was discovered to cause lead poisoning and was phased out in the US and other countries starting in the 1970s.
