Regan Brown
Fuel tank sealants are essential for the safety and function of aircraft, preventing fuel leaks and contamination. The sealant must be able to withstand the conditions of flight and landing, and not react with fuels and oils. Sealants come in a variety of application styles, including roller, brush, extrusion, and sprayable grades. Self-sealing fuel tanks, which use layers of rubber and fabric, are also commonly used in aircraft to prevent fuel leaks and ignition after damage. Removing old sealants can be tedious, but tools like pneumatic seal scrapers and chemical removers can aid in the process.
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What You'll Learn
Self-sealing fuel tanks
The development of self-sealing fuel tanks was a significant advancement in aircraft safety, particularly during World War I and World War II. Early attempts at creating self-sealing tanks involved using metal tanks covered inside or outside by a material that expanded when pierced. However, it was discovered that the exit of the projectile often created a larger hole, posing a greater challenge. As a result, companies like Fireproof Tanks Ltd in the UK and Firestone Tire and Rubber Company in the US began developing more advanced self-sealing tank technologies.
One notable patent for a self-sealing fuel tank design was filed by Ernst Eger of the United States Rubber Company in 1941. Elmo E. Hanson, the lead chemist for Firestone Tire and Rubber Company, also filed a patent for a self-sealing tank in 1941. These tanks were designed to withstand the impact of bullets and autocannon shells, and they were implemented in various aircraft during World War II. Despite their lower fuel capacity, aircraft with self-sealing tanks could withstand significantly more damage compared to those with conventional fuel tanks.
The implementation of self-sealing technology in aircraft fuel tanks had some drawbacks, including increased weight, reduced manoeuvrability, lower endurance, and a shorter operational range. To mitigate these issues, some designs used a middle layer of sponge rubber to reduce weight and improve sealing speed. However, this approach had limited success due to the lack of strength in the sponge rubber, which could be torn and carried into the interior of the tanks by bullets.
The process of sealing an aircraft fuel tank involves several steps. Firstly, the tank must be cleaned and prepared by removing any loose rust, old sealers, or contaminants using a cleaner degreaser. After the tank is thoroughly cleaned and dried, a metal prep product is applied to etch the metal and improve the adhesion of the sealer. Then, the fuel tank sealer is poured into the tank and drained after a certain amount of time to remove any excess. Finally, fuel preservation and stabilizer products are used to maintain the fuel system and prevent "stale gas" issues.
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Types of sealants and application styles
Fuel tank sealants are essential for the safety and functionality of aircraft. Sealants are designed to prevent leaks and contain volatile and combustible fuels within a closed system, while also preventing foreign materials from contaminating the fuel. Sealants must be able to withstand the intense jolts and movements associated with flight and landing, and cure at room temperature without reacting with fuels and oils.
There are various types of sealants available, each with unique characteristics and application methods. Here are the most common types of sealants and their application styles:
Roller-Grade Sealants
Roller-grade sealants are designed for application using rollers. They are typically used for large surface areas and provide an even and smooth finish. Roller-grade sealants are often preferred for their efficiency, as they can cover a significant area in a relatively short amount of time.
Brush-Grade Sealants
Brush-grade sealants are formulated for application with brushes. They are ideal for smaller areas or intricate details that require a precise and controlled application. Brush-grade sealants may require more time and labour but offer a more customised and tailored approach.
Extrusion-Grade Sealants
Extrusion-grade sealants are designed to be applied through a pneumatic sealant gun, which extrudes the sealant directly onto the desired surface. This method is often used for precise bead application and can be highly effective for sealing joints and seams.
Sprayable-Grade Sealants
Sprayable-grade sealants are applied by spraying, allowing for a quick and efficient application process. This method is ideal for covering large surface areas with minimal time and effort. However, it is important to ensure adequate ventilation and respiratory protection during application due to the potential for airborne particles.
Self-Sealing Fuel Tanks
Self-sealing fuel tanks (SSFT) are a type of fuel tank designed to prevent fuel leakage and ignition after sustaining damage. These tanks have layers of rubber and reinforcing fabric, including vulcanized rubber and untreated natural rubber, which absorbs fuel when punctured, causing the untreated layer to swell and seal the puncture. This technology was developed during wartime and has been continuously improved upon, enhancing the safety of aircraft.
Metal Fuel Tank Sealers
Metal fuel tank sealers, such as POR-15 Fuel Tank Sealer, are formulated specifically for metal fuel tanks. They are designed to be impervious to various fuels, including diesel, E10 ethanol, and high alcohol content fuels. These sealers act as a liner, preventing rust, corrosion, and small fuel leaks. The application process involves cleaning and preparing the metal surface, applying the sealer, and then draining and rinsing the tank to remove excess sealant.
The choice of sealant depends on the specific requirements of the aircraft fuel tank, including the material, cure time, weight, and style of the fuel tank. It is crucial to follow the instructions and safety guidelines provided with the chosen sealant product to ensure a proper seal and maintain the safety of the aircraft.
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Preparing the tank for sealing
Remove Old Sealant:
Start by removing any old sealant or residue from the tank. This can be a tedious and challenging task, often requiring manual scraping using tools like scrapers, brushes, and pneumatic seal scrapers. Chemical agents like Polygone can help break down the adhesive, but they may need to be left on for several hours to be effective. It is important to be cautious and patient during this process to ensure the tank's surface is thoroughly cleaned.
Clean and Degrease the Tank:
Once the old sealant is removed, clean the tank thoroughly to eliminate any contaminants. Use a suitable cleaner or degreaser, such as POR-15 Cleaner Degreaser, to ensure the surface is free of grease, oil, and other residues. This step is crucial for achieving proper adhesion of the new sealant.
Inspect for Damage and Repairs:
Before sealing, inspect the fuel tank for any damage, rust, or corrosion. Address any issues, such as small pinhole leaks or loose rust, to ensure the tank is structurally sound. This may involve sanding or using rust removal products to create a smooth and stable surface for sealing.
Prepare the Surface:
To enhance adhesion, prepare the surface of the tank by etching it with a suitable product, such as POR-15 Metal Prep. This step helps create a rougher surface for the sealant to grip onto, improving its bonding strength. Follow the manufacturer's instructions for proper application techniques and safety precautions.
Ensure Tank is Dry:
After cleaning and surface preparation, ensure the tank is completely dry before proceeding with the sealing process. Allow adequate time for the tank to air dry, or use compressed air or absorbent cloths to speed up the drying process. A dry tank is essential to prevent moisture from becoming trapped underneath the sealant.
Choose the Appropriate Sealant:
Select a sealant that is compatible with the fuel tank material and meets the specific requirements of your aircraft. Consider factors such as cure time, weight, tank parts, and application style (roller-grade, brush-grade, etc.). Ensure the sealant is approved for aviation use and can withstand the unique conditions of flight without reacting with fuels and oils.
By carefully following these steps, you can effectively prepare an aircraft fuel tank for sealing, ensuring a tight and durable seal that meets safety regulations.
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Removing old sealant
Preparation:
Before starting the removal process, ensure that the fuel tank is completely empty and free from any fuel residue. It is crucial to work in a well-ventilated area to avoid inhaling fumes. Wear protective gear, including gloves, eye protection, and a respirator, to safeguard against any chemical exposure.
Chemical Methods:
Chemical methods can be effective in breaking down the adhesive in the sealant. One option is to use a product specifically designed for fuel tank sealant removal, such as POR-15 Strip Gel, which can help dissolve the old sealant. Alternatively, a chemical like MEK (Methyl Ethyl Ketone) can be used, but it requires extra caution due to its hazardous nature. Always follow the manufacturer's instructions and safety guidelines when working with chemicals.
Mechanical Tools:
Mechanical tools can assist in physically scraping and cutting away the old sealant. Pneumatic seal scrapers, similar to air chisels with replaceable plastic tips, are effective in chipping away the sealant without damaging the metal. Additionally, a simple red scraper wrapped in tape, coupled with a hammer, can be useful. Keep the scraper sharp using a sanding disc or by sharpening it on a belt sander. An air-powered dremmel tool with a plastic bit can also aid in the removal process.
Time and Effort:
It's important to recognize that removing old sealant from an aircraft fuel tank requires time and elbow grease. Even with chemical treatments, some manual scraping will likely be necessary. Be prepared for a labour-intensive process, and consider assigning this task to individuals with the stamina for such work.
Safety Precautions:
Always exercise extreme caution when working with aircraft fuel tanks. Avoid creating sparks or exposing the tank to open flames during the removal process. Ensure the work environment is well-ventilated, and always follow safety protocols to prevent injuries and accidents.
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Maintaining the tank seal
Preparation
Before applying any sealant, it is crucial to prepare the fuel tank thoroughly. Remove any old sealants, loose rust, or contaminants using suitable methods such as scraping, chemical removers, or cleaning solutions. Ensure the tank is structurally sound, free from plastic parts, and completely dry before proceeding.
Choosing the Right Sealant
Select a suitable aircraft fuel tank sealant that meets or exceeds FAA regulations. Consider the specific requirements of your application, including the type of material, cure time, weight, and fuel tank parts. Sealants come in various application styles, such as roller-grade, brush-grade, extrusion-grade, and sprayable-grade, so choose the one that best suits your needs.
Application
Always follow the instructions and safety guidelines provided with your chosen sealant product. Ensure proper ventilation and personal protective equipment during application. Apply the sealant evenly and thoroughly to all relevant surfaces, maintaining a consistent thickness.
Curing and Inspection
Allow the sealant to cure at room temperature, ensuring it remains undisturbed during this process. Once cured, inspect the seal for any imperfections or gaps that could compromise its integrity. If necessary, apply a second coat or make touch-ups as per the manufacturer's recommendations.
Maintenance
Regularly inspect the fuel tank seal for any signs of wear, degradation, or damage. Implement a maintenance schedule that includes periodic cleaning and resealing if needed. Keep a record of any repairs or modifications made to the seal, and always follow the manufacturer's guidelines for sealant maintenance.
By following these steps and staying vigilant, you can effectively maintain the tank seal of your aircraft fuel tank, ensuring the safety and functionality of the aircraft.
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Frequently asked questions
An aircraft fuel tank sealant is a product that keeps combustible and volatile fuels and oils within a closed system while preventing foreign materials from contaminating the fuel.
Aircraft fuel tank sealants play a vital role in the safety and function of aircraft. Sealants are formulated to maintain their integrity when exposed to the unique conditions of flight.
There are various types of aircraft fuel tank sealants, including roller grade, brush grade, extrusion grade, and sprayable grade. Additionally, there are self-sealing fuel tanks, which have layers of rubber and reinforcing fabric to absorb fuel and seal punctures.
Before applying an aircraft fuel tank sealant, the tank must be cleaned and prepared. This may involve removing old sealant and ensuring the tank is free from contaminants and structurally sound. Always follow the instructions and safety guidelines provided with the specific sealant product.
