Sylvie Willis
Maintaining a jet fuel tank is a critical yet challenging task. Jet fuel tanks require regular cleaning and inspection to prevent contamination and ensure optimal fuel quality. Contaminants such as water, sludge, and volatile organic compounds (VOCs) can lead to fuel degradation, microbial growth, and safety hazards. Proper maintenance involves stabilising temperatures, managing condensation, and periodically emptying, cleaning, and drying the tank. Innovative methods, such as NanoVapor's chemical coating technology, offer faster and more efficient alternatives to traditional air purging or tank diving procedures. Adopting effective maintenance practices is crucial for preserving fuel integrity, tank longevity, and overall safety in jet fuel operations.
| Characteristics | Values |
|---|---|
| Maintenance method | Tank diving |
| Tank diving safety measure | Air purging of jet-fuel fumes |
| Alternative method | NanoVapor |
| NanoVapor process | Injecting a tiny mix of chemicals and water vapour |
| NanoVapor benefits | Takes less time, doesn't alter fuel flammability, doesn't leave liquid water in tanks |
| NanoVapor drawbacks | Not approved by FAA, concerns about acids |
| Fuel type | Jet fuel is a kerosene product |
| Jet fuel storage | Can be stored for years, even in unusual tanks |
| Jet fuel tank material | Brass and other catalytic metal alloys should not be used |
| Jet fuel contaminants | Water, microbes |
| Jet fuel maintenance | Periodic cleaning, removing sludge and water, checking vent and fill cap |
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What You'll Learn
- Regularly clean and dry the tank to prevent sludge build-up
- Avoid water contamination, which can cause corrosion and fuel contamination
- Prevent microbial growth with biocides
- Use a roof covering to limit rainwater accumulation and UV light exposure
- Ensure safe 'tank diving' maintenance with sufficient oxygen and VOC levels
Regularly clean and dry the tank to prevent sludge build-up
Regular cleaning and drying of jet fuel tanks is essential to prevent sludge build-up and maintain optimal fuel quality. Sludge can accumulate through regular use, and if left unchecked, it can compromise the integrity of the fuel and the tank itself.
The cleaning process for jet fuel tanks typically involves several steps, including emptying the tank, removing any debris and sludge, rinsing the tank, and ensuring thorough drying before returning the tank to service. This process helps eliminate water and other contaminants that can lead to fuel degradation and equipment issues.
To address sludge and water build-up, it is recommended to use water separators, which recycle the fuel and facilitate the safe discharge of water. Additionally, maintaining proper insulation is crucial to stabilize temperatures and reduce condensation. A roof structure over the tank can also limit rainwater accumulation and reduce the chances of water entering the tank.
In some cases, "tank diving" may be required for maintenance, which involves mechanics entering the tanks with respirators and external air supplies. This process can be time-consuming and risky, so alternative methods, such as NanoVapor's chemical coating solution, have been proposed to reduce the time needed for maintenance.
By regularly cleaning and drying jet fuel tanks, you can ensure the fuel remains uncontaminated and the tank is well-maintained, reducing the risk of performance issues and costly repairs.
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Avoid water contamination, which can cause corrosion and fuel contamination
Water contamination is one of the most common and potentially damaging issues in jet fuel tanks. Water can enter the fuel tank through condensation, as fuel systems are often vented to the outside. This can lead to corrosion and fuel contamination, which can cause engine failure and other serious problems. Therefore, it is important to regularly inspect and maintain jet fuel tanks to prevent and mitigate water contamination.
- Regularly inspect and test the fuel for water contamination: This can be done through visual inspections, chemical analyses, and fuel sampling. Fuel sampling can be done by draining fuel into a clear container and holding it up to the light to spot water and contaminants. It is recommended to check for water contamination every 30 days.
- Control water accumulation: While water accumulation is inevitable in most fuel tanks, it can be managed through regular inspections and the use of water-absorbing treatments. Removing water from the tank will help preserve the fuel and prevent future problems.
- Top off the fuel tanks at the end of each flying day: Jet fuel tends to absorb moisture from the atmosphere. By topping off the tanks, there will be less air in the system, reducing the rate of moisture absorption.
- Maintain good housekeeping habits: Keep storage and dispensing equipment clean and free from dirt and foreign matter. This can help control fuel contaminants.
- Drain off the water: Some tanks have valves at the bottom that allow for the removal of water without losing any fuel.
By following these measures, you can help prevent water contamination in jet fuel tanks, reducing the risk of corrosion and fuel contamination, and ensuring the safe operation of the aircraft.
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Prevent microbial growth with biocides
Microbial growth in jet fuel tanks can have serious consequences, including fuel degradation, filter blockage, corrosion, and operational problems. To prevent and control microbial growth, it is essential to maintain and inspect fuel tanks regularly. Here are some key strategies to prevent microbial growth with biocides:
Prevent Water Accumulation
The presence of water is a critical factor in promoting microbial growth. By regularly removing water from jet fuel tanks, the risk of microbial contamination can be significantly reduced. This can be achieved through daily draining of storage tanks and filter vessels, as well as implementing fuel-water separation procedures.
Apply Biocide Treatments
Biocides are chemical additives designed to eradicate a broad spectrum of microbial species in fuel tanks. When microbial growth is detected, biocides can be used as a cost-effective solution to quickly neutralise the contamination. However, it is important to remember that biocides do not remove dead microbial matter, so physical cleaning of the tank is still necessary.
Implement Routine Maintenance
A preventative maintenance program that includes routine tank cleaning, inspection, and treatment can help keep microbial activity at low levels. This involves periodic testing and sampling of the fuel to detect early signs of microbial growth. Additionally, fuel filtration and polishing techniques can be employed to remove water and contaminants from the fuel without physically removing the fuel from the tank.
Select Appropriate Biocide Products
When choosing a biocide product, consider factors such as solubility, compatibility with fuel and system components, speed of microbe eradication, and industry and regulatory approvals. For example, CleanBoost® Anti-Microbe Fuel Conditioner is approved by the EPA and can be used in diesel and biodiesel fuels.
Monitor and Control
Regularly monitor fuel tanks for signs of microbial contamination through visual inspections, sampling, and testing. If contamination is detected, trained professionals can apply biocide treatments on-site. Adopting a routine maintenance program can help protect the value of jet fuel and related infrastructure.
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Use a roof covering to limit rainwater accumulation and UV light exposure
Water buildup is detrimental to your jet fuel tank, as it can lead to both tank corrosion and fuel contamination. Microorganisms like bacteria and fungi require water to survive, and water can cause damaging ice blockages to form. To address water-related concerns, you can minimise water accumulation by maintaining tank insulation and implementing a roof structure.
A roof covering over your jet fuel tank will effectively limit rainwater accumulation and reduce the chance of water entering the tank. By providing a physical barrier, the roof prevents rainwater from directly falling and accumulating around the tank, minimising the risk of water ingress. This protective layer also helps to shield the tank from the elements, reducing exposure to ultraviolet (UV) light.
UV light from the sun can negatively impact the tank's integrity over time. The roof structure acts as a sunshade, reducing the amount of UV radiation reaching the tank. This measure helps to slow down the degradation process caused by prolonged UV exposure, thereby prolonging the lifespan of the jet fuel tank.
Additionally, the roof structure aids in maintaining stable temperatures within the tank. Rapid temperature swings can lead to condensation, but the roof helps to regulate the environment, reducing the occurrence of condensation. This temperature stabilisation further contributes to limiting water buildup, as condensation can be a source of moisture accumulation.
By implementing a roof covering, you can effectively minimise rainwater accumulation, reduce the potential for water-related issues, and limit UV light exposure. This proactive maintenance measure helps to maintain the integrity of the jet fuel tank, ensuring its optimal performance and longevity.
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Ensure safe 'tank diving' maintenance with sufficient oxygen and VOC levels
Maintaining a jet fuel tank is crucial for ensuring optimal performance and preventing costly damage. One important aspect of jet fuel tank maintenance is "tank diving," which involves entering the tank to perform inspections or repairs. To ensure safe tank diving conditions, it is essential to focus on maintaining sufficient oxygen and volatile organic compound (VOC) levels.
- Ventilation and Air Purging: Before entering a jet fuel tank, it is crucial to ventilate the space by purging the air inside. This process, also known as "degassing," involves blowing fresh air into the tank for an extended period to displace any jet fuel fumes or VOCs. The duration of air purging depends on the size of the jet and the VOC limits set by the airline. For example, Southwest Airlines blows air for 8-12 hours into its Boeing 737 tanks.
- Oxygen Levels: Mechanics should ensure that oxygen levels within the tank are sufficient and safe for breathing. Jet A-1 VOC levels below 160 parts per million are generally considered safe for breathing, although different airlines may have their own VOC limits ranging from 35 to 700 parts per million. Boeing recommends the use of respirators with charcoal filters at higher VOC levels.
- Fire Safety: Volatile organic compounds are highly flammable, so it is crucial to maintain VOC levels below 1,400 parts per million to prevent fires. This can be achieved through adequate air purging and the use of chemical treatments, such as NanoVapor, which can suppress VOC levels to 100 parts per million.
- Alternative Methods: In addition to air purging, NanoVapor has proposed an alternative method that involves coating tank surfaces with tiny chemical particles. This method is significantly faster, but it has not yet been approved by the FAA for commercial use.
- Monitoring and Testing: Regular monitoring and testing of oxygen and VOC levels are essential to ensure the safety of divers. Divers should also examine carbon dioxide levels and ensure their equipment, such as respirators and air supplies, is functioning properly.
By following these guidelines and maintaining safe oxygen and VOC levels, mechanics can perform tank diving maintenance tasks in jet fuel tanks while minimising risks to their health and safety.
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Frequently asked questions
Here are some general tips for maintaining jet fuel tanks:
- Keep the tank covered to limit rainwater accumulation and reduce the chance of water entering the tank.
- Use water separators to recycle the fuel and allow for the safe discharge of water.
- Regularly clean the tank to remove any built-up sludge or water.
- Check the state of the vent and fill cap to ensure they are not leaking and allowing water to enter the tank.
Microbial contamination occurs when trace water is present in the storage tank, allowing microbes to grow at the fuel-water interface. To prevent this, it is crucial to drain any water from the jet fuel tank. Additionally, using preventative doses of diesel fuel biocides can help prevent the growth of microbes and bacteria in your fuel.
"Tank diving" refers to the common but risky maintenance task of working inside aircraft fuel tanks. The conventional method for ensuring safety during tank diving is air purging or degassing, which involves blowing air into the tanks for an extended period to remove jet fuel fumes or volatile organic compounds (VOCs). However, this process can be time-consuming. An alternative method proposed by NanoVapor involves coating tank surfaces with tiny chemical particles, which is claimed to be faster and safer. While NanoVapor's method has been evaluated for over a decade, it has not yet been approved by the FAA for use by U.S. airlines.
When storing jet fuel, it is important to consider the product's volatility and the potential for gum formation due to oxidation from air. Jet fuel, as a kerosene product, has better storage stability than Avgas and can be stored for years under the right conditions. To prevent gum formation, antioxidants or special chemical additives called "hindered phenols" are added in limited amounts to capture reactive oxygen species. Additionally, avoid using catalytic metals like copper in jet fuel storage tanks, as they can cause fuel instability and carbon deposit formation.
