Rajan Wilcox
Metal fuel tanks can be flushed and reused for water storage, but it is not recommended for drinking water due to potential health risks. Steel units, for example, are not suitable for drinking water as they will quickly rust when in contact with water. Aluminum tanks are also not ideal for potable water as they can be damaged by copper fittings, which are commonly found in boats. Additionally, there are chemicals in the metal that can leach into the water, posing potential health risks. However, with proper maintenance, metal fuel tanks can be used for non-drinking purposes, such as showers, after ensuring thorough cleaning and flushing to remove any fuel residue and corrosion.
Metal Fuel Tanks for Water Storage
| Characteristics | Values |
|---|---|
| Metal Leaching | Chemicals in the metal can be absorbed by water, which can be unhealthy |
| Rust | Rust can contaminate water |
| Left-over fuel | Water can be contaminated by left-over fuel |
| Cleaning | Metal fuel tanks can be cleaned using phosphoric acid, citric acid, white vinegar, kerosene, or fuel additives |
| Maintenance | Aluminum and steel tanks require more maintenance than composite tanks and can fail in less than five years |
| Corrosion | Corrosion can occur due to the presence of microbes feeding off water and fuel, or due to exposure to seawater |
| Copper Fittings | Copper fittings should not be attached directly to aluminum tanks as they can cause the tank to become sacrificial |
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What You'll Learn
- Metal fuel tanks are not recommended for drinking water due to potential chemical leaching and rust
- Aluminium tanks are used for water storage in the marine industry, but they must be clean and uncontaminated
- Steel tanks are not suitable for drinking water as they will quickly rust
- To prevent corrosion, minimise water entry and keep the tank clean
- Cleaning methods include using citric acid, phosphoric acid, vinegar, or fuel additives
Metal fuel tanks are not recommended for drinking water due to potential chemical leaching and rust
Metal fuel tanks are not recommended for storing drinking water due to the potential for chemical leaching and rust. While it is possible to clean and flush metal fuel tanks, it is challenging to do so without removing the tank from the vehicle. Even with proper maintenance, metal fuel tanks can fail and start to leak in less than five years.
Metal fuel tanks are susceptible to corrosion and rust, especially when exposed to moisture. This corrosion can be caused by the presence of microbes feeding off the water and fuel, as well as the use of copper fittings in contact with aluminium tanks. Corrosion and rust can contaminate the water stored in the tank, making it unsafe for drinking.
Additionally, there are chemicals present in metal fuel tanks that can leach into the water over time. These chemicals can be harmful to human health, making the water unsafe for consumption. While flushing and cleaning the tank may remove some of these chemicals, it is challenging to access all the connections and openings without removing the tank.
Proper maintenance of metal fuel tanks is crucial to prevent corrosion and rust. This includes keeping the tank clean, minimizing the amount of water that enters the tank, and ensuring adequate airflow around the tank to protect against external corrosion. However, even with proper maintenance, metal fuel tanks may not be suitable for storing drinking water due to the potential for chemical leaching.
Some alternative methods for cleaning metal fuel tanks include using phosphoric acid, citric acid, or vinegar to remove rust and corrosion. These methods can be effective, but they may not address the potential for chemical leaching, making the water unsafe for drinking. Therefore, it is recommended to use dedicated water storage containers made from materials deemed safe by the manufacturer for storing drinking water.
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Aluminium tanks are used for water storage in the marine industry, but they must be clean and uncontaminated
Aluminium tanks are used for water storage in the marine industry. However, there are some important considerations to ensure they are suitable for this purpose. Firstly, aluminium tanks must be clean and uncontaminated before being used for water storage. This includes ensuring that there is no residual fuel, rust, or other chemicals in the tank that could contaminate the water.
One way to ensure the tank is clean is by performing a pressure test. This requires an empty tank with all openings blocked, which can be challenging to access on some installations. Frequent use of the tank and the addition of fuel additives can also help keep the tank clean by agitating the fuel and moving it through the filters. It is also important to periodically inspect the interior of the tank for any signs of corrosion or contamination.
To protect against external corrosion, ample airflow around the tanks is necessary. Moisture-absorbing materials, such as sound-damping insulation or wood braces, should be kept away from the metal as they can contribute to poultice corrosion and tank failure. Additionally, sources of continued exposure to seawater, such as a leaking deck fill or a spraying shaft seal, should be addressed.
Internal corrosion can be minimised by reducing the amount of water that enters the tank. This can be achieved by ensuring the deck fill O-ring is in place and in good condition. Finally, it is important to avoid contact between aluminium and copper, as they are far apart on the galvanic scale and copper will damage the aluminium. This includes avoiding direct contact between aluminium tanks and bronze or brass fittings, which contain mostly copper.
By following these guidelines, aluminium tanks can be effectively used for water storage in the marine industry while maintaining the integrity and longevity of the tanks.
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Steel tanks are not suitable for drinking water as they will quickly rust
Steel tanks are not suitable for storing drinking water as they will quickly rust. While steel tanks are commonly used for storing diesel and unleaded fuels, they are not ideal for water storage. This is because water causes steel tanks to rust rapidly, and rust can contaminate the water, making it unsafe for drinking.
There are other concerns with using metal tanks for drinking water. For example, there are chemicals in the metal that can leach into the water. These chemicals can be harmful to human health. Additionally, it can be challenging to ensure that the tank is thoroughly cleaned and free of any fuel residue, which could also contaminate the water.
Aluminum is another material used for fuel tanks. While it is possible to use aluminum tanks for water storage, they require careful maintenance to prevent corrosion. Aluminum tanks can corrode due to exposure to seawater or when in contact with moisture-absorbing materials. To prevent corrosion, it is essential to ensure proper airflow around the tanks and avoid using moisture-absorbing materials nearby. Regular inspections and cleaning of the tank's interior are also necessary to remove any fuel residue and prevent corrosion caused by microbes.
To clean metal fuel tanks, various methods can be used, such as citric acid, white vinegar, phosphoric acid products, or fuel additives. These solutions are often diluted with water and left in the tank for several days before rinsing and drying. However, it is important to note that cleaning a fuel tank without removing it from the car or vehicle can be challenging, and proper tank removal and professional cleaning may be recommended in some cases.
In summary, steel tanks are not suitable for storing drinking water due to their propensity to rust quickly. While aluminum tanks can be used for water storage, they require careful maintenance to prevent corrosion and contamination. Proper cleaning and maintenance of metal fuel tanks are essential to ensure they can be safely used for water storage, but it is always recommended to use containers specifically designed and deemed safe for drinking water storage.
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To prevent corrosion, minimise water entry and keep the tank clean
To prevent corrosion, minimise water entry, and keep a metal fuel tank clean for use with water, there are several measures to consider. Firstly, it is important to regularly inspect and clean the tank. This includes inspecting for any signs of damage that could allow water entry, such as damaged vents, overflow screens, holes, gaps, or hatches that are not properly sealed. Regular cleaning can help prevent algae growth, sediment buildup, visible discolouration, or biofilm formation, all of which can impact water quality. Pressure washing and specific cleaning agents can be used to deep clean the tank's interior and exterior.
Additionally, implementing a mixing system can help prevent stratification issues by mixing newer, denser water from the bottom with warmer, less dense surface water. This also helps to reduce disinfectant byproducts like trihalomethanes and haloacetic acids, which are potentially carcinogenic. To further minimise water entry, ensure that the tank is protected from unauthorised access by installing measures such as fencing, locks, trespassing signs, surveillance cameras, and lights.
Another effective strategy is to use water tank liners, which create a physical barrier between the water and the tank walls. Liners are especially beneficial in tanks exposed to sunlight or high humidity, as these conditions promote algae growth. By reducing direct contact between the water and the tank, liners help maintain water quality and extend the lifespan of the tank by inhibiting corrosion. Regular testing of the water and the tank itself is also crucial to prevent contamination and ensure the water remains safe for use.
Overall, by prioritising regular inspections, cleaning, implementing mixing systems, using tank liners, and minimising water entry, you can effectively prevent corrosion and maintain a clean metal fuel tank suitable for water storage.
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Cleaning methods include using citric acid, phosphoric acid, vinegar, or fuel additives
Cleaning metal fuel tanks is an important step before using them for water storage, as it ensures the removal of any fuel residue, dirt, or contaminants. Here are some effective cleaning methods that can be used:
Citric Acid
Citric acid is a popular choice for cleaning metal fuel tanks due to its effectiveness in removing rust and its ease of use. It can be purchased as a powder and mixed with hot water to create a cleaning solution. The recommended ratio is 1 kilogram of citric acid to 20 litres of water. Users should fill the tank with this solution, leave it for several days, and then rinse the tank thoroughly with clean water. It is important to note that rust may form again unless the tank is coated or filled with fuel after cleaning. Additionally, citric acid should not be left in contact with certain metals like brass for extended periods, as it can cause damage.
Phosphoric Acid
Phosphoric acid is another effective option for cleaning metal fuel tanks. It can dissolve rust and "pickle" the metal, preventing future rusting. Users can purchase phosphoric acid-based products like Ospho or Prep & Etch from various stores. The tank should be filled with a diluted solution of phosphoric acid and water, left for a day, and then drained. The inside of the tank can then be dried with a small amount of acetone before being drained again.
Vinegar
White vinegar is a common household item that can be used to clean metal fuel tanks. It is effective in removing light rust when left in the tank for a couple of days with occasional shaking or agitation. After using vinegar, it is recommended to flush the tank with kerosene before putting it away for later use. It is important to monitor the cleaning process to avoid excessive corrosion or pitting of the metal.
Fuel Additives
Some fuel additives, such as "Evaporust" or "MetalRescue," can be used to clean metal fuel tanks. These products use a chelating agent to chemically reduce rust and restore the metal. They are known for being easy to use, non-toxic, and gentle on the metal, only removing the rust without causing damage to the tank itself.
It is important to note that proper safety precautions should be taken when handling any of these cleaning agents, and users should always ensure adequate ventilation during the cleaning process.
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Frequently asked questions
Yes, metal fuel tanks can be flushed and reused for water storage. However, it is not recommended for drinking water due to the possibility of chemical leaching, rust, and leftover fuel residue.
Using a metal fuel tank for drinking water can pose health risks due to the presence of chemicals, rust, and leftover fuel residue. These contaminants can leach into the water and be harmful if consumed.
To clean a metal fuel tank, you can use a variety of methods, including phosphoric acid products, citric acid, or white vinegar. It is important to remove all water residue and seal the tank to prevent rust and corrosion.
Yes, plastic containers specifically designed for storing drinking water are a safer alternative. These containers are deemed safe by manufacturers and can be purchased from RV and marine stores.
To extend the life of a metal fuel tank, it is important to prevent corrosion and maintain the integrity of the tank. Ensure proper airflow, minimize moisture exposure, and keep the tank clean. Regularly inspect the tank for any signs of corrosion or leaks, and consider using fuel additives or polishers to agitate the fuel and remove buildup.
