Sylvie Willis
The longevity of diesel fuel depends on several factors, including environmental and storage conditions. When stored in optimal environments, diesel fuel typically remains viable for up to a year without significant quality loss. However, with proper additives and storage practices, its shelf life can be extended. To maintain diesel fuel quality and longevity, it is crucial to store it in a clean, closed tank, away from direct sunlight, and at the right temperature. Additionally, regular tank inspections and maintenance are essential to prevent contamination and degradation.
| Characteristics | Values |
|---|---|
| Optimal storage temperature | 20°F to 70°F |
| Water contamination | Can enter through condensation, leaks, or poor storage conditions |
| Microbial growth | Occurs in the presence of water |
| Fuel contamination | Can occur due to exposure to oxygen, leading to oxidation and the formation of sludge |
| Fuel stabilizers | Can be added to extend shelf life |
| Biocides | Prevent the growth of bacteria and fungi |
| Biofilm | A thick, sludge-like mass that grows at the diesel-water interface |
| Fuel Water Separator (FWS) | Removes water from fuel |
| Fuel polishing | Removes contaminants and stabilizes fuel |
| Underground storage tanks | Provide better temperature regulation and reduce exposure to sunlight |
| Regular cleaning | Every 1-2 years to prevent sludge and water accumulation |
| Shelf life | 6-24 months; can be extended with optimal storage conditions and fuel additives |
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What You'll Learn
Optimal storage conditions
The optimal storage conditions for diesel fuel depend on several factors, including the type of fuel, the storage environment, and the maintenance practices employed. Here are some detailed guidelines on how to optimally store diesel fuel:
Temperature Control
Keeping the fuel stored at a cool temperature is crucial. Ideally, maintain a temperature below 70 degrees Fahrenheit. Higher temperatures accelerate fuel degradation. Underground tanks provide better temperature regulation, keeping the fuel cooler. If using an above-ground tank, ensure it is shaded or insulated to maintain the desired temperature range.
Water and Moisture Prevention
Water is one of the primary enemies of diesel fuel. When diesel comes into contact with water, it undergoes a hydrolysis reaction, breaking down the fuel and making it susceptible to microbial growth. Ensure your tank is well-insulated from moisture. Regularly inspect and clean your tank to prevent water accumulation. Remove water from the tank monthly to minimize the risk of microbial contamination.
Microbial Growth Prevention
Microbial growth, including bacteria and fungi, can cause significant issues with diesel fuel. These microbes feed on the fuel and produce acids that degrade the fuel, clog filters, and corrode tanks. Use biocides to prevent and control microbial growth. Additionally, address the presence of biofilms—thick, sludge-like masses produced by microorganisms—as they can reduce the effectiveness of biocides and require mechanical cleaning in severe cases.
Fuel Stabilizers and Additives
To extend the shelf life of diesel fuel beyond 12 months, incorporate fuel stabilizers. These additives help preserve the quality of the fuel and inhibit degradation. Additionally, consider using antioxidants to interrupt oxidation reactions that can lead to fuel darkening and stratification.
Tank Maintenance and Monitoring
Regular tank maintenance and monitoring are essential. Inspect your tank for signs of contamination and sludge buildup. Follow a maintenance program that includes periodic cleaning and inspection. Consider investing in professional fuel polishing services, especially for large reserves stored long-term. Comply with applicable regulations, such as OSHA and EPA standards, to ensure the safe handling and storage of diesel fuel.
By adhering to these optimal storage conditions, you can effectively preserve the quality of diesel fuel and extend its shelf life.
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Preventing contamination
Diesel fuel contamination is a serious issue that can lead to equipment malfunction, leaks, and environmental damage. To prevent contamination, it is important to implement a comprehensive fuel conditioning programme that includes regular testing, fuel and tank cleaning, and diesel polishing. Here are some specific strategies to prevent contamination:
- Control water build-up: All tanks build up water over time, and water provides an ideal environment for microbial growth. Therefore, it is important to regularly remove water from the tank, especially after rain. Consider investing in an automatic tank gauging system (ATG) that uses sensors to detect water and alert the operator.
- Prevent microbial growth: Microbial contamination, also known as diesel bug or diesel fungus, is a common issue with diesel fuel. To prevent it, use biocides that inhibit the growth of bacteria and fungi. Regularly check for signs of biofilm, a thick sludge-like mass that can grow at the diesel-water interface and promote microbial growth. If biofilm is present, the tank may need to be mechanically cleaned to fully eliminate it.
- Maintain tank integrity: Regularly inspect the tank for any signs of damage or wear, such as loose filler caps, worn seals, torn gaskets, or broken tank breather pipes, which can allow water or contaminants to enter.
- Keep the tank cool: Oxidation, a chemical reaction between diesel fuel and oxygen, is accelerated by higher temperatures. Keeping the tank cool, ideally around 20°F, helps delay oxidation and reduces the risk of contamination. Underground tanks or enclosures can help maintain cooler temperatures.
- Use fuel stabilizers: Incorporating diesel fuel stabilizers can help prolong the shelf life of diesel fuel and reduce the risk of contamination.
- Regular testing and maintenance: Establish a regular maintenance programme that includes testing the fuel for contamination and cleaning the tank to remove any contaminants. This is especially important for emergency generators, as the fuel source is often overlooked in testing and maintenance.
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The role of temperature
Temperature plays a significant role in the longevity of diesel fuel. Fluctuating temperatures, especially extremes of heat and cold, can contribute to diesel fuel degradation. High temperatures can cause the lighter components of the fuel to evaporate, while extreme cold may lead to paraffin wax crystallization. Therefore, it is essential to maintain a cool temperature for diesel fuel storage. The ideal temperature range is between 20°F and 70°F, but it should not exceed 85°F.
To achieve and maintain optimal temperatures, several measures can be implemented. Firstly, consider investing in an underground storage tank as it helps keep the fuel cooler and extends its lifespan. Additionally, providing a roof, a canopy, or some type of enclosure can reduce exposure to the sun, mitigating the risk of diesel contamination due to high temperatures.
Another way to maintain temperature control is by ensuring proper ventilation in the storage facility. This prevents the tank from overheating. If storing diesel in separate bottles, keep them in a cool, dark place away from direct sunlight.
Temperature fluctuations can also impact the water content in the fuel. Lower temperatures at night can cause the fuel to retain less dissolved water, leading to the formation of free water at the bottom of the tank. This creates an environment that microbes find attractive for growth, which can negatively impact fuel quality. Therefore, it is essential to regularly remove water from the tank and monitor fuel conditions to prevent microbial contamination.
By regulating temperatures and implementing good housekeeping practices, you can effectively extend the shelf life of diesel fuel and maintain its optimal characteristics.
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Tank maintenance
Diesel fuel can last between 12 and 24 months in a storage tank, but only if it's well maintained. In the past, diesel fuel used to last much longer—the US Army reported that stored diesel fuel could last up to five years in the 1950s. However, today's diesel fuel has changed, and it's more prone to contamination and degradation.
To ensure that your diesel fuel lasts as long as possible and remains in optimal condition, regular tank maintenance is crucial. Here are some detailed instructions for maintaining your diesel fuel storage tank:
Keep the Tank Cool and Dry
Oxidation is a chemical reaction that occurs when diesel fuel is exposed to oxygen, resulting in the formation of gum, sludge, and sediment that can clog filters and corrode the tank. Keeping the tank cool helps delay oxidation. The ideal temperature for storing diesel fuel is below 20°C, and it should be kept away from direct sunlight. Additionally, water buildup can lead to corrosion and provide an environment for microbial growth. Check the tank regularly for pooled water, especially after rain, and remove any water to prevent these issues.
Prevent Microbial Growth
Microbial growth, such as bacteria and fungi, can cause several problems, including tank corrosion, clogged filters, and reduced fuel performance. To prevent microbial growth, keep the tank dry, as microorganisms need water to survive. You may also need to use diesel fuel biocides or other additives to address infestations and prevent future growth. Biocides are essential for killing germs and keeping the system free of bacteria. Additionally, fuel additives can increase fuel efficiency, help disperse water, and stabilize the fuel, allowing for longer-term fuel storage.
Use Fuel Treatment and Monitor Conditions
Use fuel treatment with demulsifying properties to separate water from fuel. Check if your tank has a Fuel Water Separator (FWS) filter, as demulsifying treatments can boost its performance. Additionally, regularly monitor the fuel for microbial presence and water buildup. Establish a timeframe to use up old fuel and replace it with fresh diesel periodically.
Choose the Right Tank and Follow Regulations
Above-ground storage tanks (ASTs) are generally easier to maintain and relocate than underground storage tanks. They are also safer for the environment and subject to fewer federal regulations. However, ensure your AST is placed out of the way to promote safety and avoid it becoming an eyesore. If you choose an underground storage tank, invest in a bunded diesel storage tank to catch any oil leaks and safeguard the environment. Regardless of the tank type, follow all federal, state, and local standards and regulations for fuel storage.
Regular Cleaning and Maintenance
Establish a monitoring and maintenance plan for your diesel fuel tank. This is especially important if the diesel fuel is for emergency use, as you want to ensure it remains in good condition. Empty and thoroughly clean the tank every ten years to maintain the life of the diesel fuel and the tank itself. Regular maintenance ensures that you have clean and ready-to-use fuel when needed.
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Additives and treatments
Biocides
Biocides are essential in preventing the growth of microbes, such as bacteria and fungi, which thrive at the water-diesel interface. Once present, these microbes multiply rapidly and are challenging to eliminate. Biocides are particularly crucial when dealing with biodiesel, as it increases diesel fuel's ability to hold water and provides an ideal environment for microbial growth.
Preventing Biofilm
Biofilm is a thick, sludge-like substance that can develop at the diesel-water interface. It reduces the effectiveness of biocides and promotes re-infection of microbial growth after treatment. Mechanical cleaning of the tank may be necessary to eliminate biofilm before biocide treatment for optimal results.
Fuel Treatments
Fuel treatments with demulsifying properties help separate water from fuel, improving the performance of Fuel Water Separator (FWS) filters commonly found in modern tanks. Regularly checking for pooled water, especially after rainfall, is crucial for maintaining the structural integrity of the tank and preventing microbial growth.
Temperature Control
Maintaining a cool tank is vital to delaying oxidation, a chemical reaction that occurs when diesel fuel is exposed to oxygen. Ideal temperatures are below 20°C (68°F), with a maximum of 30°C (86°F). Underground tanks or enclosures that provide shade and reduce sun exposure can help achieve these ideal temperatures.
Additives for Long-Term Storage
Additives such as Biobor DC and Fuel Store Plus are designed for long-term storage. They contain high doses of antioxidants and biocides, delaying fuel discolouration, solid formation, and corrosion. These additives help prevent microbial growth and extend the shelf life of diesel fuel.
Fuel Reviver
In cases where fuel stocks have become discoloured and oxidised, Fuel Reviver can be used to restore stability. It revives oxidation levels, ensuring that the fuel meets OEM requirements for stability and performance.
By utilising these additives and treatments, you can effectively manage the challenges associated with storing diesel fuel and ensure its longevity and optimal performance.
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Frequently asked questions
It depends on a combination of environmental and storage factors. With proper additives and maintenance, the shelf life of diesel can extend to 2-3 years.
It is recommended to store diesel fuel in a clean, closed, and cool tank. Use biocides to prevent microbial growth. Maintain the temperature between 20°F and 70°F.
Water contamination can lead to microbial growth, corrosion, and fuel instability. Water can enter the tank through condensation, leaks, or poor storage conditions.
It is recommended to clean the tank every 1-2 years to prevent sludge and water accumulation.
Some signs of degraded diesel fuel include rust, sludge, clogged filters, or an unusual odor.
