Katerina Swanson
Fuel tanks are one of the most vulnerable parts of a vehicle when under attack. Since WWII, most military aircraft have used self-sealing fuel tanks, which are designed to prevent fuel leaks and ignition when damaged. Self-sealing fuel tanks have layers of rubber and reinforcing fabric, with one layer swelling and sealing the puncture when it comes into contact with fuel. Goodyear chemist James Merrill filed a patent in 1941 for a two-layer system of rubber compounds encased in a metal outer shell, which was placed in Goodyear-produced Vought F4U Corsair fighters and other aircraft.
| Characteristics | Values |
|---|---|
| Self-sealing fuel tanks | Used in aircraft, military vehicles, and the U.S. presidential state car |
| Materials | Rubber, fabric, metal |
| Function | Prevents fuel leakage and ignition after damage |
| Effectiveness | Withstands bullets up to .50 in (12.7 mm) |
| Alternative methods | Use of inert gases like nitrogen to prevent explosion |
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What You'll Learn
Self-sealing fuel tanks
A self-sealing fuel tank (SSFT) is a type of fuel tank that prevents fuel leakage and ignition when damaged. They are typically used in aircraft fuel tanks or fuel bladders. The tank consists of layers of rubber and reinforcing fabric, one of vulcanized rubber and one of untreated natural rubber. When a fuel tank is punctured, the fuel is absorbed into these layers, causing the untreated layer to swell and seal the puncture.
The concept of self-sealing fuel tanks was developed during World War I, with George J. Murdock applying for a patent in 1917. However, the Federal Trade Commission blocked the patent from being published, and it was only granted by the United States Patent Office in 1918. Early attempts at creating self-sealing fuel tanks involved covering metal tanks with a material that expanded when pierced. It was discovered that the exit of the projectile created a larger problem due to the tumbling effect, which resulted in a more massive exit hole.
During World War II, several companies in the United States were involved in developing self-sealing fuel tank technology. These included the Firestone Tire and Rubber Company, where Elmo E. Hanson, the lead chemist, filed a patent for self-sealing tanks in 1941. Goodyear chemist James Merrill also patented a method for manufacturing self-sealing tanks using a two-layer system of rubber compounds encased in a metal outer shell. These tanks were placed in Goodyear-produced Vought F4U Corsair fighters and other aircraft. Fireproof Tanks, another company, developed the first flexible fuel bladders as range extender tanks for the Spitfire Mk IX.
The use of self-sealing fuel tanks has some drawbacks. The additional technology makes the aircraft heavier, resulting in reduced speed, manoeuvrability, endurance, and operational range. Additionally, the sealing of bullet holes can clog fuel strainers or carburetor jets with dissolved or partially dissolved rubber. Despite these limitations, self-sealing fuel tanks have significantly improved aircraft safety and performance, particularly in military applications.
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Fuel tank vulnerabilities
Fuel tanks have been a target of choice for attackers, whether in military or civilian contexts. The consequences of fuel tank vulnerabilities can range from minor to disastrous.
One of the most vulnerable parts of a vehicle when under attack is its fuel tank. A conventional fuel tank, when hit by gunfire, can leak fuel rapidly. This would not only reduce the vehicle's range but also pose a significant fire hazard. Damaged fuel tanks could also rupture, destroying the vehicle's structure or critically affecting its performance.
To mitigate these risks, self-sealing fuel tanks (SSFTs) were introduced. SSFTs are designed to prevent fuel leakage and ignition after the tank has been damaged. They typically consist of layers of rubber and reinforcing fabric, including vulcanized rubber and untreated natural rubber. When a fuel tank is punctured, the fuel is absorbed by the untreated layer, causing it to swell and seal the puncture. Goodyear chemist James Merrill patented a method for manufacturing self-sealing tanks using a two-layer system of rubber compounds encased in a metal outer shell. During World War II, Goodyear tanks were placed in service in Vought F4U Corsair fighters and other aircraft.
While SSFTs provide increased protection, they are not bulletproof. Additionally, modern fuel tank monitoring systems, such as Automatic Tank Gauging (ATG) systems, have been found to have critical vulnerabilities. These systems are used in pumps at petrol stations, military bases, hospitals, airports, emergency services, and power plants. Researchers have identified zero-day vulnerabilities in ATG systems, which, if exploited, could lead to widespread physical damage, environmental hazards, and economic losses. Attackers can manipulate tank settings to cause fuel leaks, disable alarms, and even gather sensitive corporate data.
The vulnerabilities in ATG systems enable attackers to cause significant damage beyond pump disablement, including changing tank information, switching labels, and disabling alarms. One of the simplest attacks is a Denial of Service (DoS) attack, where attackers reconfigure the system, delete values, or flash faulty firmware, rendering the pump non-functional. More advanced attacks can target the core functions of the ATG system, such as manipulating tank settings to cause leaks or disabling alarms that prevent overfilling.
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Fuel tank materials
Fuel tanks are used to store flammable gasoline and fuel and are used in nearly all automobiles and aircraft. The materials used to make fuel tanks vary depending on the type of vehicle or aircraft.
Self-sealing fuel tanks (SSFTs) are a type of fuel tank that prevents fuel leakage and ignition after being damaged. They are typically used in aircraft fuel tanks or fuel bladders. SSFTs have layers of rubber and reinforcing fabric, one of vulcanized rubber and one of untreated natural rubber, which can absorb fuel when it comes into contact with it. When a fuel tank is punctured, the fuel seeps into these layers, causing the untreated layer to swell and seal the puncture. SSFTs have been used in military aircraft and vehicles, such as the United States Marine Corps' LAV-AT armoured vehicles, as well as in non-military vehicles like the U.S. presidential state car.
Metal fuel tanks, made from materials such as aluminium, steel, or stainless steel, are commonly used in automobiles and aircraft. The thickness of the metal and the type of weld used are important factors in the durability and longevity of the fuel tank. Additionally, coatings or treatments are applied to metal fuel tanks to protect them from corrosion and rust, especially in marine environments.
Other materials used for fuel tanks include fiberglass, plastic, and high-carbon steel. Each material has its own advantages and disadvantages in terms of cost, weight, durability, and resistance to corrosion.
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Fuel tank coatings
Fuel tanks are highly vulnerable to damage when under attack, which can lead to fuel leaks and fires. To mitigate this, some fuel tanks are designed to be self-sealing, preventing fuel leaks and ignition. Self-sealing fuel tanks typically consist of layers of rubber and reinforcing fabric, including vulcanized rubber and untreated natural rubber. When a self-sealing fuel tank is punctured, the fuel is absorbed by the untreated layer, causing it to swell and seal the puncture.
Self-sealing fuel tanks have been used in military and non-military vehicles, including aircraft and armoured vehicles. For example, the United States Marine Corps' LAV-AT armoured vehicles and the U.S. presidential state car feature self-sealing fuel tanks. During World War II, various countries developed self-sealing fuel tanks, incorporating materials such as rubber, leather, and treated fibre.
To enhance the protection of fuel tanks, coatings or sealers can be applied. These coatings aim to prevent fuel leaks, rust, corrosion, and other types of damage. One such product is the POR-15 Fuel Tank Sealer, which is designed for metal fuel tanks and is effective with various fuels, including diesel, E10 ethanol, and high-alcohol content fuels. The application process involves cleaning and preparing the fuel tank by removing contaminants, rust, and old sealers, followed by coating the tank with the sealer and draining the excess.
Another option is the Caswell Epoxy Gas Tank Sealer, which offers chemical and corrosion resistance. This epoxy sealer can withstand immersion in harsh solvents, fuels, and oils. It is suitable for recoating fuel tanks that have previously failed with other sealers. The application process involves removing old coatings, preparing the surface, and applying the epoxy sealer, allowing it to cure, and following specific instructions for different types of fuel.
By utilising self-sealing fuel tanks and applying specialised coatings, the risk of fuel leaks and subsequent fires or explosions can be significantly reduced, enhancing the safety of vehicles and aircraft, especially in military and combat situations.
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Fuel tank explosions
Fuel tanks are vulnerable to damage and can be a safety hazard. Fuel tank explosions have resulted in many casualties and injuries, as well as damage to property.
Explosions can occur when fuel tanks are hit by gunfire or damaged in an accident, causing fuel to leak and ignite. For example, in 1961, a gasoline tank truck in Toledo, Ohio, rolled over, spilling its contents and resulting in an explosion that killed four firefighters and injured eleven others. More recently, in 2015, a fuel tank truck explosion in Pakistan killed 219 people and injured at least 34 others.
To mitigate the risk of explosions, some fuel tanks are designed to be self-sealing. These tanks have layers of rubber and reinforcing fabric, including vulcanized rubber and untreated natural rubber. When a tank is punctured, the fuel is absorbed by the untreated layer, causing it to swell and seal the puncture, preventing fuel leakage. Self-sealing fuel tanks have been used in aircraft since World War II to minimize the risk of fuel leakage and ignition.
Additionally, modern aircraft fuel tanks are filled with inert gases like nitrogen to prevent explosions. By maintaining a low oxygen level within the tank, combustion cannot occur, even if the tank is damaged. This safety measure further reduces the risk of fuel tank explosions in aircraft.
While fuel tank explosions can have devastating consequences, the implementation of self-sealing tanks and inert gas systems has significantly enhanced safety, particularly in the aviation industry. These measures ensure that fuel tanks are more resilient to damage and reduce the likelihood of fuel ignition, protecting both passengers and bystanders from potential harm.
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Frequently asked questions
Yes, some fuel tanks are bullet-resistant. Self-sealing fuel tanks (SSFTs) are designed to prevent fuel tanks from leaking and igniting when damaged by bullets. These tanks are typically used in aircraft and military vehicles.
Self-sealing fuel tanks have layers of rubber and reinforcing fabric, including vulcanized rubber and untreated natural rubber. When a bullet punctures the tank, the fuel seeps into these layers, causing the untreated layer to swell and seal the puncture.
No, not all aircraft fuel tanks are bullet-resistant. However, since WWII, most military aircraft have used self-sealing fuel tanks to prevent fuel leaks and fires.
The outcome depends on various factors, including the type of bullet and the fuel-air mixture in the tank. A regular bullet may not be hot enough to cause an explosion, but it can puncture the tank and cause a fuel leak. If ignited by a hot object, the leaking fuel could catch fire.
