Mercedes Mullins
The shelf life of diesel fuel depends on several factors, including the presence of biodiesel, microbial contamination, and water accumulation. While diesel fuel was previously known for its longer storage life, today's diesel fuel has a reduced stability due to changes in its composition. Modern refining processes have made diesel more susceptible to contamination and degradation, with an average shelf life of 6 to 12 months. Proper storage practices, such as using fuel additives, biocides, stabilizers, and maintaining optimal temperatures, can extend the shelf life beyond a year. Additionally, regular maintenance and monitoring are crucial to prevent microbial growth and ensure fuel quality.
| Characteristics | Values |
|---|---|
| Biodiesel content | Increases diesel fuel's ability to hold water and chances of microbial problems |
| Sulfur content | Low-sulfur diesel is more prone to contamination |
| Water | Water buildup in tanks encourages microbial growth |
| Temperature | Higher temperatures dissolve more water into the fuel |
| Storage life | 6-12 months on average, up to 5 years when mixed with fresh diesel |
| Additives | Biocides and stabilizers can extend shelf life |
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What You'll Learn
Biodiesel content and water build-up
The biodiesel content in diesel fuel and the build-up of water in storage tanks are key factors that affect how long diesel fuel stays fresh.
Biodiesel has a higher affinity for water than standard petroleum diesel, with the water-retaining capacity of biodiesel being significantly higher. Biodiesel can contain up to 10 times more water than standard diesel fuel. This excess water can lead to several issues, including accelerated fuel-filter plugging, microbial contamination, and icing problems in winter.
The presence of biodiesel in diesel fuel increases its ability to hold water and makes it more susceptible to microbial growth. Microbes thrive in the presence of water, and their growth can rapidly deteriorate fuel quality. Additionally, the process of removing sulfur from diesel fuel to meet ultra-low sulfur diesel (ULSD) standards results in the removal of compounds that naturally help repel water. As a result, ULSD attracts more water, further exacerbating the problem of water build-up in diesel fuel tanks.
To mitigate these issues, regular maintenance and the use of additives are crucial. Water removal and microbial control measures, such as simple housekeeping and condition monitoring, can help extend the shelf life of diesel fuel. Additionally, storing diesel fuel in underground tanks can help maintain cooler temperatures, which can slow down the growth of microbes and other organisms.
The inclusion of biodiesel in diesel fuel and its impact on water retention, along with proper storage and maintenance practices, are critical considerations in ensuring the longevity and freshness of diesel fuel.
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Microbial growth
The growth of microbes in diesel fuel is encouraged by the presence of water, which can enter the fuel through condensation, rainwater penetration, or absorption from the air. Modern biodiesel is especially hygroscopic, meaning it attracts and retains water. The process of removing sulfur from diesel fuel to meet ultra-low sulfur standards also removes compounds that used to help diesel repel water, further increasing the risk of microbial growth.
The ideal temperature range for microbial growth is 10°C (50°F) to 40°C (104°F). When the temperature is higher, diesel fuel can dissolve more water, and when the temperature drops, the fuel releases the dissolved water, creating an environment that microbes find attractive. The microbial growth occurs at the interface between the oil and water, usually at the bottom of the tank.
Microbial contamination can cause the fuel to turn a dark khaki color and give off a rotten fuel smell due to sulfuric acidic byproducts. It can also lead to black exhaust smoke during system startup and increased corrosion from acidic byproducts.
To prevent microbial growth, it is essential to control water buildup in diesel fuel tanks. Procedures such as water separation, routine discharge of water bottoms, and fuel tank insulation can help. Regular tank inspections, cleaning, and treatments with approved diesel fuel biocides or microbial growth removers are also recommended to control and prevent microbial growth.
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Oxidation
The stability of diesel fuel refers to how well it resists the reactions and changes that all fuels undergo over time. Modern refining processes have left today's distillate more unstable and susceptible to contamination.
One of the key factors affecting the stability of diesel fuel is its biodiesel content. Biodiesel increases diesel fuel's ability to hold water and also makes it more susceptible to microbial contamination. This is because microbes feed on biodiesel, and the presence of water aids their growth. The water builds up in storage tanks as the fuel warms up during the day and cools down at night. This process is exacerbated by the removal of sulfur from diesel fuel to meet ultra-low sulfur standards, as sulfur compounds used to aid in the separation of water from the fuel.
Another factor contributing to the degradation of diesel fuel is the presence of cracked feedstocks in today's diesel fuels.
The shelf life of diesel fuel is typically between 6 to 12 months, with some sources stating that it can last up to 1.5 to 2 years with proper storage conditions. However, within 28 days of storage, diesel fuel #2 begins to become contaminated and degrade. To prolong the life of diesel fuel, it is recommended to store it in an underground tank to maintain cooler temperatures and implement regular maintenance and monitoring to control microbial growth.
Additionally, mixing old diesel with fresh diesel or using additives such as Diesel 911 cetane boost can help improve its longevity.
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Additives and biocides
Biocides effectively kill and prevent the growth of these microbes, but they do not address the root cause of microbial contamination, which is often the presence of water in the fuel. Water creates the perfect environment for microbial proliferation and can lead to issues with the fuel tank, filters, and injectors. Therefore, while biocides are necessary, they should be used in conjunction with other measures to address the underlying causes of contamination.
One way to enhance the effectiveness of biocides is to use them with a biomass dispersant chemical. Biomass dispersants break up the biofilms formed by microbes, allowing the biocide to penetrate and kill a higher number of microbes. Additionally, proper circulation of the fuel is critical to ensure the biocide reaches all areas where bacteria are present.
Some commonly used diesel fuel biocides include Bellicide, Bio Kleen, and Clear-Diesel Fuel & Tank Cleaner. These products are designed to kill microbes and control microbial growth in diesel fuel. It is important to follow the recommended concentrations and application methods for these biocides to ensure their effectiveness.
In addition to biocides, fuel stabilizers and antioxidants can be used to interrupt the chemical reactions in the fuel caused by exposure to water and air. These stabilizers help to preserve the quality of the diesel fuel over time. Regular maintenance, such as removing water and contaminants from the fuel tank, is also crucial in preventing microbial growth and maintaining fuel freshness.
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Storage solutions
Diesel fuel can be stored for varying lengths of time, depending on several factors. On average, diesel fuel can be stored from 6 to 12 months, sometimes longer under the best conditions. The first factor that affects the shelf life of diesel is the presence of biodiesel in the fuel. Biodiesel increases diesel fuel's ability to hold water, which can lead to microbial problems as microbes feed on the water. Additionally, ultra-low sulfur diesel fuels attract more water due to the removal of sulfur compounds, which used to help diesel fuel repel water.
To combat microbial growth, regular maintenance and simple housekeeping are necessary. Keeping water levels low in the tank is crucial as microbes need water to multiply. Using additives such as Biobor Fuel Additives can also help preserve the fuel and reduce maintenance costs.
Another factor that affects diesel's shelf life is temperature. Higher temperatures cause petroleum fuels to dissolve more water, and when temperatures drop, the fuel releases this water, creating an environment that microbes find attractive. Therefore, storing diesel in a cool, underground storage tank can prolong its life.
Additionally, keeping the tank full during long-term storage helps reduce condensation and slows down fuel degradation. It is also important to inspect the system and fuel regularly to fix any issues before they cause further damage.
For those constantly adding fresh fuel, the old and new fuel mix, keeping the old fuel in good condition. In situations where fresh fuel is not available, mixing old diesel with fresh diesel in a 50/50 ratio can improve its quality. Alternatively, adding a product like Diesel 911 cetane boost can help pep up old diesel.
In conclusion, storing diesel fuel requires attention to various factors, including water levels, temperature, regular maintenance, and the use of additives. By addressing these factors, one can prolong the shelf life of diesel fuel and ensure its quality for future use.
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Frequently asked questions
On average, diesel fuel can last between six to twelve months when stored correctly. However, this timeframe can vary depending on factors such as the presence of biodiesel, microbial growth, and water buildup.
The shelf life of diesel fuel is influenced by several factors, including the amount of biodiesel in the fuel, the presence and growth of microbes, and the accumulation of water. Biodiesel increases the fuel's ability to hold water, making it more susceptible to microbial growth.
To extend the shelf life of diesel fuel, it is recommended to use additives such as biocides or stabilizers to prevent microbial growth and oxidation. Additionally, regular maintenance and proper storage conditions, such as keeping the fuel in a cool, dry, and shaded area, can help prolong its freshness.
Clogged filters and rust on the filler cap are common signs of diesel fuel degradation. Visual inspection can also reveal issues such as sludge, water buildup, or particulate matter in the fuel. If the fuel turns black, it indicates an algae infestation, requiring specialized treatment.
