Ameer Randolph
Bunker fuel is a colloquial term for any fuel oil poured into a ship's bunkers to power its engines. It is the fuel of choice for the world's largest container ships, bulkers, and other vessels as it is much cheaper than distillate alternatives. However, it is considered the 'dirtiest' of the fuel oils used at sea and is very toxic. Bunker C, the very heavy fuel, is used when a ship is underway and has to be heated with steam to thin it out enough to be pumped through the purifiers and into the day tank. The amount of bunker fuel used by ships has raised concerns about the environmental impact of shipping, with a single large container ship emitting pollutants equivalent to that of 50 million cars in a year.
| Characteristics | Values |
|---|---|
| Definition | Bunker fuel is the generic term for any fuel poured into a ship's bunkers to power its engines. |
| Origin of Name | The name 'bunker fuel' comes from the age of steam ships, when the coal used to fuel vessels was stored in coal bunkers onboard. |
| Fuel Type | Bunker fuel is classified as a ''fuel oil'' and is considered the 'crudest' and 'dirtiest' of the fuel oils used at sea. |
| Cost | Bunker fuel is cheaper than other alternatives. |
| Environmental Impact | Bunker fuel has a high sulphur content, with up to 2,000 times more sulphur than diesel fuel. It is a major source of shipping emissions, contributing to air pollution and climate change. |
| Fuel Testing | Bunker fuels are frequently a source of quality issues, resulting in damage to ship engines. Regular fuel testing is important to avoid such issues. |
| Fuel Grades | Bunker fuels are graded as A, B, and C, with A being the highest quality and C being the lowest. |
| Usage | Bunker C fuel is used when the ship is underway and requires heating to thin it out for pumping. |
| Alternatives | Alternatives to bunker fuel include cleaner fractions of petroleum, bio-oils, and natural gas. Nuclear propulsion is another option, already in use in naval vessels. |
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What You'll Learn
Bunker fuel is cheap, toxic, and bad for the environment
Bunker fuel is a broad term for any fuel used on a ship. It is derived from the age of steam ships, when onboard coal was stored in coal bunkers. Bunker fuel is predominantly used as a fuel source for marine vessel propulsion using marine diesel engines. It is a category of heavy fuel oils (HFO) that are the result of the distillation and cracking process of petroleum.
HFO is cheaper than other fuel oils, being up to 30% less expensive, and is the most widely used engine fuel oil on board ships. However, it is harmful to the environment and human health. HFO contains several compounds, including aromatics, sulfur, and nitrogen, which make emissions upon combustion more polluting compared to other fuel oils. The emissions from burning HFO contribute significantly to climate change and negatively impact the environment and human health. The use and carriage of HFO onboard vessels present several environmental concerns, including the risk of oil spills and the emission of toxic compounds and particulates, including black carbon.
The high viscosity and density of HFO mean that when it is released into the environment, it is a greater threat to flora and fauna compared to other residual fuels. Its viscosity prevents its breakdown, and its density, tendency to persist, and emulsify can result in HFO polluting both the water column and seabed. When heavy fuel oil is burnt, it is especially harmful to human health, causing serious illnesses and deaths.
Due to the environmental and health concerns associated with HFO, there have been efforts to regulate its use and promote alternative fuels. In 2020, the International Marine Organization (IMO) set regulations requiring all marine shipping vessels to use very low sulfur fuel oil (0.5% sulfur) or install exhaust gas scrubber systems to remove excess sulfur dioxide. Additionally, only about 1% of the global shipping fleet uses alternative fuels like liquefied natural gas (LNG), electric, wind, solar, and nuclear power. While these alternatives have the potential to directly cut carbon, sulfuric, and GHG emissions, they are still in their infancy stages of development and trials.
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Bunker fuel is a generic term for marine fuel
Bunker fuels are part of a broader family of fuels known as fuel oils, which can be divided into two categories: distillates and residual fuel oils. Distillate fuel oils are produced by conventional distillation and burn cleaner, while residual fuel oils are considered the 'crudest' and 'dirtiest' of marine fuel oils. They are the remnants of the refining process, often blended, and have a much lower cost than distillate alternatives.
Residual fuel oils include intermediate fuel oil 180 (IFO 180s) and intermediate fuel oil 380 (IFO 380s), which refer to the maximum permissible viscosities of these fuels at 50°C. Within these two groups, the five individual grades of bunker fuel commonly used for marine transportation are distinguished by differences in carbon residue, ash, and vanadium content. Bunker A, B, and C are also used as classifications, referring to the downgrading quality of fuel oil based on boiling points, carbon-chain lengths, and viscosities.
The use of bunker fuel has significant environmental implications. Bunker fuel spills are among the most environmentally damaging disasters worldwide, and the largest and most damaging pollution events often involve spills of heavy bunker fuel from tankers, ships, or drill platforms at sea. Bunker fuel is also associated with high CO2 emissions, contributing around 2.7% of all anthropogenic CO2 emissions in 2000. To address these concerns, the International Maritime Organization (IMO) has implemented regulations to reduce sulphur content in marine fuels and limit pollution.
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Bunker fuel is classified based on viscosity, pour point, sulphur, carbon, and metal residue content
Bunker fuel is a broad term for any fuel oil used aboard water vessels. It gets its name from the age of steam ships, when the coal used to fuel vessels was stored in coal bunkers onboard. Bunker fuels are part of a broader family of fuels known as fuel oils, which can be divided into distillates and residuals.
Residual fuel oils are the remnants of the refining process and are often blended. They are considered the "crudest" and "dirtiest" of the fuel oils that are used at sea. They are also much cheaper than distillate alternatives. Residual fuel oils include the commonly used marine fuels IFO 180 and IFO 380, which are distinguished by their maximum permissible viscosities at 50°C of 180 and 380 mm2/s (cSt), respectively.
Viscosity is a crucial factor in the classification of bunker fuels. It refers to the thickness of the fuel and can be adjusted by heating the fuel or using a mild thermal cracking process called visbreaking. The unit of viscosity used for bunker fuels is the centistoke (cSt).
Another important classification factor is sulphur content. Sulphur is a natural component of crude oil and is found in all petroleum products. The ISO 8217 standard sets a maximum viscosity for marine fuels, and the fuels most frequently quoted are listed in order of cost, the least expensive first. IFO 380, for example, is an intermediate fuel oil with a maximum viscosity of 380 centistokes and a sulphur content of less than 3.5%. LS 380, on the other hand, is a low-sulphur intermediate fuel oil with a maximum viscosity of 380 centistokes and a sulphur content of less than 1.0%.
In addition to viscosity and sulphur content, bunker fuels are also classified based on their pour point, carbon residue, and metal residue content. The pour point refers to the lowest temperature at which the fuel will flow. Carbon residue is the carbon content of the fuel that is left behind after combustion. Metal residue content refers to the amount of metal particles present in the fuel, which can include vanadium and other inorganic residuals.
In recent years, there has been a push to reduce the sulphur content of bunker fuels to limit pollution. Emission Control Areas (ECA) have been established to limit the maximum sulphur content of fuels burned in their ports, reducing the percentage of sulphur and other particulates from 4.5% m/m to as little as 0.10% as of 2015 inside an ECA. Additionally, there is a growing trend towards alternative low-carbon fuels in the shipping industry, such as liquefied natural gas (LNG), electric, wind, solar, and nuclear power.
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Bunker fuel is supplied to ships via a bunker hose
Bunker fuel refers to the various grades of marine fuels used to power ships. It is classified based on viscosity, pour point, sulfur content, carbon content, and metals residue. Bunker fuels are part of a broader family of fuels known as fuel oils, which can be further divided into distillates and residual fuel oils. Residual fuel oils, being the remnants of the refining process, are considered cheaper and "dirtier" than distillate alternatives. Due to the wax in fuel oils, some need to be heated to maintain sufficient viscosity.
Proper handling and storage of the bunker hose are crucial. It should be stored in a cool, dry space away from direct sunlight to prevent damage to certain hose materials. During operation, pressure levels and temperatures should be monitored to avoid extreme conditions that could lead to hose failure. It is also important to avoid kinks or sharp bends, as this can reduce the hose's effectiveness. Additionally, the hose should be cleaned after each fuel transfer.
To ensure the safe and efficient use of bunker fuel, it is important to follow proper bunkering procedures. This includes understanding the correct procedure for bunkering to prevent oil spills and conducting a pre-bunkering meeting to discuss safety aspects. Care should be taken to avoid over-pressurizing the hose during the bunkering operation and to maintain a consistent supply pressure. The receiving ship should agree on a desired flow rate, starting slowly and gradually increasing once any potential leakage is ruled out.
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Bunker fuel is linked to oil pollution
Bunker fuel refers to the various grades of marine fuels used for powering ships. It is derived from the age of steam ships when the coal used to fuel vessels was stored in coal bunkers onboard. Bunker fuel is considered the 'crudest' and 'dirtiest' of the fuel oils used at sea. It is a thick residue left behind in refineries after the lighter liquids have been extracted. This tar-like substance contains compounds such as aromatics, sulphur, nitrogen, and wax.
The maritime industry has been working to reduce the harmful impacts of shipping on the environment. Regulations such as the Prevention of Air Pollution from Ships (Annex VI) aim to control airborne emissions from vessels, including sulphur oxide (SOx), nitrogen oxide (NOx), and particulate matter. The International Air Pollution Prevention (IAPP) Certificate is issued to ships that comply with the applicable limit value for sulphur content in their fuel oil.
Additionally, the use of low-emission alternatives, such as liquefied natural gas (LNG) in "dual fuel" engines, has been explored to reduce emissions. LNG produces 15-29% less CO2 and lower amounts of sulphur oxides and nitrogen oxide compared to conventional fuels. While these efforts are ongoing, it is important to recognize that bunker fuel continues to contribute to oil pollution, and that comprehensive measures are necessary to mitigate its environmental impact.
Furthermore, it is worth noting that the amount of bunker fuel consumed by ships is significant. The largest vessels have colossal engines, contributing to substantial fuel consumption. The environmental impact of bunker fuel is exacerbated by the sheer volume utilized by the shipping industry.
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Frequently asked questions
Bunker fuel is any fuel poured into a ship's bunkers to power its engines. It is the fuel of choice for the world's largest container ships, bulkers, and other vessels.
Ships use bunker fuel because it is cheap. It is the heavy residual oil left over after gasoline, diesel, and other light hydrocarbons are extracted from crude oil during the refining process.
A single large container ship can consume fuel by the ton per hour. The world's 90,000 cargo ships emit 20 million tons of Sulphur Oxides annually.
Bunker fuel is very toxic and has been described as the "crudest" and "dirtiest" of the fuel oils used at sea. It has been estimated that in one year, a single large container ship can emit cancer and asthma-causing pollutants equivalent to that of 50 million cars.
Ships can switch to cleaner fractions of petroleum or various bio-oils. Nuclear marine propulsion has been in use since 1955, with 150 ships currently using nuclear propulsion.
