Sylvie Willis
Cleaning above-ground fuel tanks is an essential part of tank maintenance. Fuel tank cleaning helps to prevent corrosion and other issues that can lead to leaks or spills. It also ensures that the fuel remains clean and in top condition. Over time, impurities and contaminants can accumulate in the fuel tank, affecting the engine's efficiency and longevity. Therefore, it is important to clean above-ground fuel tanks regularly and properly. This involves draining the tank, removing sludge and debris, scrubbing the interior, rinsing, drying, and refilling the tank.
Characteristics and Values Table for Cleaning Above Ground Fuel Tanks
| Characteristics | Values |
|---|---|
| Frequency | Annually or every 3-5 years, depending on state regulations |
| Purpose | To preserve fuel integrity and fleet engine health, prevent corrosion, and address microbial growth |
| Preparation | Drain the tank, assess the liquids stored in it and their chemical properties, minimize sludge |
| Cleaning Process | Use shovels, vacuum trucks, squeegees, or scrapers to remove sludge, scrub with a brush and detergent solution, rinse with water, dry |
| Reassembly | Reinstall, refill, replace fuel filter, tighten fittings and secure connections |
| Safety | Use high-pressure water, explosion-proof lights, confined space entry permit, address hazardous fumes |
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What You'll Learn
Drain the tank
Draining the tank is the first step in cleaning an above-ground fuel tank. This process involves removing all residual fuel, moisture, and other liquids from the tank. If the tank has not been drained and cleaned in a long time, a special liquid may need to be sprayed on the interior to break down thick sludge so that it can be extracted via a pump or hose.
Before draining, it is important to assess the physical and chemical properties of the tank's contents and associated deposits. This includes checking for things like electrical conductivity, lead content, toxic additives, and hydrogen sulfide. Understanding these properties will help predict the behaviour of the contents during the cleaning process.
Once the initial assessment is complete, the old fuel can be safely drained into an appropriate container. This step ensures that the tank is empty and ready for the next stage of cleaning. It is important to follow proper disposal procedures and channel any wastewater away from the property and into an approved disposal area.
If there is any sludge or solid debris at the bottom of the tank, it should be carefully removed using shovels or specialised tools such as vacuum trucks, squeegees, or scrapers. This step ensures that the majority of the solid waste is removed before the next stage of cleaning.
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Scrub the interior
Scrubbing the interior of an above-ground fuel tank is a crucial step in the cleaning process. It ensures that no impurities remain, preserving fuel integrity and engine health. Before scrubbing, ensure the tank is drained of residual fuel, moisture, and other liquids. If there is thick sludge at the bottom, a special liquid may need to be sprayed to render it pumpable for extraction.
When scrubbing the interior, use a long-handled brush and a fuel-safe cleaner. You can fill a bucket with a mild detergent solution mixed with water, or use a specialised industrial cleaner designed for fuel tank cleaning. Scrub the inner walls and floors thoroughly to remove any stubborn dirt, stains, organic matter, or sludge that may be left over.
High-pressure water can also be used to scrub and rinse the interior of the tank. This method can be effective in removing stubborn residue and ensuring a thorough clean. However, ensure that all detergent residue is rinsed away with clean water after scrubbing. Properly dispose of the wastewater by channelling it away from your property and into an appropriate disposal area.
After scrubbing and rinsing, it is essential to dry the tank completely before refilling it with fuel. You can use compressed air or a heat gun to speed up the drying process. Alternatively, you can allow the tank to air dry or use fans, heaters, or dehumidifiers, depending on your specific needs and circumstances.
By thoroughly scrubbing the interior of your above-ground fuel tank, you can effectively remove any impurities and residues, ensuring that your fuel remains clean and your engine performs optimally.
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Rinse and dry
Rinsing involves thoroughly flushing the tank's interior with clean water to ensure no detergent or cleaning agent residue remains. Proper waste disposal is essential, ensuring that all wastewater is directed away from your property and into an appropriate disposal area.
The tank should then be allowed to dry completely before refilling with fuel. This step is critical to prevent bacterial growth and mould formation, which can occur in an unused storage tank. Air drying is an option, but fans, heaters, or dehumidifiers can also be used to accelerate the drying process, depending on your specific needs and circumstances.
Once the tank is confirmed to be completely dry, it can be reassembled and refilled with fuel. It is important to ensure that all fittings are tightened and connections are properly secured during the reassembly process. Additionally, monitor for any leaks or anomalies during refilling and ensure that any contaminant sources are addressed.
Maintaining above-ground fuel tanks is essential to prevent issues such as microbial growth due to moisture collection. Regular cleaning and maintenance can help to avoid costly repairs and ensure the proper functioning of the tanks.
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Reassemble and refill
Once the tank has been cleaned, rinsed, and dried, it is ready to be reassembled and refilled. Begin by reassembling any disassembled parts of the storage tank system, ensuring all fittings are tightened and connections are properly secured. Check for any damage and ensure that all contaminant sources are addressed.
After reassembly, the tank can be refilled with fresh fuel. Be sure that the tank is completely dry before adding fuel. It is important to monitor the tank for any leaks or anomalies during the refilling process.
If there was any sludge or solid debris at the bottom of the tank, it should be removed carefully using shovels or specialised cleaning tools such as vacuum trucks, squeegees, or scrapers. This ensures that the tank is thoroughly cleaned before refilling.
After refilling, it is important to continue regular maintenance and inspections of the fuel tank. This includes monitoring for water, filtering the fuel, killing microbes, and removing sludge and dead organic matter. By following these steps and maintaining the fuel tank, you can ensure the health and performance of your vehicles and machinery.
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Regular maintenance
Routine Checks and Risk Identification
Staff should conduct routine checks to identify and mitigate risks associated with oil spillage and the functioning of the tank's mechanical parts. This includes checking for leaks, temperature changes, or other anomalies. Advanced monitoring systems can be employed to continuously check for these potential issues.
Exterior Cleaning and Inspection
The exterior portion of the tank should be cleaned every other month to prevent the formation of rust and other substances that may lead to oil leakage. A high-pressure washer can be used to effectively clean the tank's exterior, including the walls, floors, and roof.
Interior Cleaning and Drying
The interior of the tank should be cleaned periodically to remove sludge, solid debris, and other impurities. Before cleaning, drain the tank safely into an appropriate container and remove the fuel pump. If there is sludge or solid debris at the bottom, use shovels or specialized tools like vacuum trucks to remove it. Then, clean the tank's interior with a fuel-safe cleaner and a long-handled brush if needed.
After cleaning, rinse the tank thoroughly with water to remove any detergent residue and ensure it is completely dry before refilling. Compressed air or a heat gun can be used to speed up the drying process.
Reassembly and Refilling
Once the tank is clean, dry, and inspected for damage, reassemble any disassembled parts, tightening all fittings and securing connections. Ensure that all contaminant sources are addressed, and then refill the tank with the intended fluids, monitoring for leaks during this process.
Regular Cleaning Interval
While regulations vary, and tanks may only require servicing every 3-5 years, best practices recommended by private groups suggest annual cleaning to prevent issues associated with fuel changes and microbial contamination.
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Frequently asked questions
While regulations vary by state, it is recommended that you clean your fuel tank at least once every 3-5 years. However, private groups like Exxon and Texaco suggest annual cleaning due to the exponential increase in microbial contamination and sludge formation in ULSD fuels.
Before cleaning, drain the tank of any residual fuel, moisture, and other liquids. If there is sludge at the bottom of the tank, use shovels or specialised cleaning tools like vacuum trucks, squeegees, or scrapers to carefully remove it.
After draining the tank, scrub the interior with a fuel-safe cleaner and a brush. Rinse the tank thoroughly with water to remove any detergent residue. Ensure that the tank is completely dry before refilling it with fuel.
Start cleaning from the top and work your way down to prevent dirt and debris from falling onto already cleaned areas. Use a checklist to ensure that you don't miss any steps in the cleaning process. Regularly inspect and clean the exterior of the tank to prevent rust formation and oil leakage.
