Sylvie Willis
Baffles are inner walls in fuel tanks that prevent the fuel from sloshing around during manoeuvring. They also increase the strength and durability of the tank. While some combat aircraft don't use baffles, opting for a sponge-like foam instead, most fuel tanks are fully baffled. Baffles are especially important in diesel fuel tanks to prevent the fuel from smashing into the sides of the tank during a crash and causing leaks.
Do diesel fuel tanks need baffles?
| Characteristics | Values |
|---|---|
| Definition | Baffles are inner walls/partitions in a diesel fuel tank. |
| Purpose | Baffles prevent fuel from sloshing around during manoeuvring, reducing unwanted dynamics and keeping the centre of gravity stable. |
| Construction | Baffles are usually welded into the tank during construction. They can be made from certain HDPE plastics, or foam. |
| Alternative | Some combat aircraft use a sponge-like foam which takes up 2% of the tank volume to dampen fuel oscillations. |
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What You'll Learn
Fuel tank baffles are inner walls that prevent fuel sloshing
Baffles are inner walls within fuel tanks that prevent fuel sloshing and increase tank strength and durability. They are vertical walls that prevent the horizontal travel of fluids, keeping the fuel from sloshing around during manoeuvring. Baffles are particularly important in aircraft, where fuel sloshing can cause unwanted flight dynamics and even pilot-induced oscillations.
Some combat aircraft use a sponge-like foam that occupies around 2% of the tank volume to dampen fuel oscillations. However, this method has been known to fail, causing the tank to crack and rupture. Baffles are also used in cars, trucks, and boats, where they are typically welded into the tank during construction.
The purpose of baffles is to limit fuel sloshing and prevent the pickup/pump from drawing air when there is still adequate fuel in the tank. During a roll or crash, especially at high speeds or with large fuel cells, the weight of the fuel can smash into the sides or top of the tank, causing cracks or leaks. Baffles help to prevent this by limiting the movement of the fuel.
Baffles can be made from HDPE plastics, specifically HDPE drain tiles, which have been proven to hold up to full submersion for long periods of time. They can also be made from metal, such as in the case of Marine Trader baffles, which are vertical and made for steel and various liquids, including diesel.
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Baffles can be made from HDPE plastics
Baffles are necessary for diesel fuel tanks to prevent the horizontal sloshing of fluids. They are usually placed vertically. While there is limited information on the types of materials used to make baffles, HDPE plastics are a good option.
High-Density Polyethylene (HDPE) is a thermoplastic polymer made from petroleum. It is one of the most versatile plastic materials, known for its high tensile strength and strength-to-density ratio. Its density ranges from 0.93 to 0.97 g, only slightly higher than LDPE, but its linear structure results in stronger intermolecular forces and better tensile strength. This means an HDPE container can safely hold over a gallon of liquid or about eight pounds of weight.
HDPE is easily malleable, making it ideal for various applications. It is commonly used for cutting boards, detergent bottles, milk jugs, food storage containers, and piping. Its high melting point allows it to remain rigid until very high temperatures, and once it reaches its melting point, it can be moulded efficiently for unique applications.
The benefits of using HDPE plastic for baffles include its strength, cost-efficiency, and environmental friendliness. It is easily recyclable, helping to reduce plastic waste in landfills. Additionally, HDPE is highly resistant to mould, mildew, rotting, and corrosion, making it suitable for applications requiring durability. It can also withstand strong acids and bases and is resistant to chemicals found in the soil, making it ideal for underground applications.
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Some combat aircraft use sponge-like foam instead of baffles
Baffles are used in fuel tanks to prevent the horizontal travel of fluids and dampen fuel oscillations. While baffles are a common feature in fuel tanks, some combat aircraft use a unique alternative: sponge-like foam. This foam, taking up only about 2% of the tank's volume, effectively dampens fuel oscillations in aircraft fuel tanks.
The use of this foam in combat aircraft fuel tanks offers several advantages. Firstly, its coarse, open-cell structure ensures that it is not dissolved by aviation fuel, which is crucial for maintaining the integrity of the foam's function. Additionally, the foam's ability to dampen fuel oscillations is impressive, enhancing the overall performance of the aircraft's fuel system.
The safety benefits of using sponge-like foam in fuel cells are significant. Fuel tanks, when only partially full, contain a layer of highly flammable gasoline vapor mixed with air. This mixture can easily lead to an explosion if ignited. By using foam, the concentration of this flammable mixture is prevented, significantly reducing the probability of an explosion in the event of a fire.
While manipulating the foam in fuel cells can provide the advantage of increased fuel capacity, it is important to recognize the associated safety risks. Altering the foam can create a major safety hazard by increasing the likelihood of the fuel cell exploding in an accident. Therefore, it is essential to carefully consider the potential consequences before making any modifications to the foam in fuel tanks or cells.
In summary, some combat aircraft utilize sponge-like foam instead of baffles in their fuel tanks. This foam effectively dampens fuel oscillations while occupying a minimal amount of tank volume. The safety benefits of using this foam are significant, as it helps prevent explosions by reducing the concentration of flammable gasoline vapor. However, any manipulation of the foam to increase fuel capacity can create safety hazards, underscoring the importance of leaving fuel cell foam untouched.
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Baffles can be vertical or horizontal
Baffles are inner walls that prevent the fuel from sloshing around and increase the strength and durability of the tank. They are essential in fuel tanks to manage oscillations during flights. For example, during a sudden acceleration, the fuel may rush backward, shifting the centre of gravity. If the fuel starts oscillating, the aircraft might fly a wavy path. Baffles prevent this by stopping the horizontal travel of fluids.
Some combat aircraft don't use baffles but instead use a sponge-like foam that takes up about 2% of the tank volume. This foam effectively dampens fuel oscillations. However, one user on a forum noted that the foam in their tank "sucks" and that they preferred the AllTech Motorsports Fuel Systems baffles. Another user noted that the foam in their tank cracked during a race, causing a "water hammer" that ruptured the bladder and spilled the fuel.
Baffles can be made out of HDPE plastics. One user on a forum noted that they have had HDPE baffles in their tank for three years with no issues.
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Baffles increase the strength and durability of the tank
Baffles are inner walls within a fuel tank that prevent the fuel from sloshing around during manoeuvres. They are usually welded into the tank during construction and can be made from certain HDPE plastics or steel.
In terms of strength and durability, baffles can increase the structural integrity of the tank. Without baffles, the fuel can rush backward or smash into the sides during a sudden acceleration or a roll/crash, causing cracks or leaks. Baffles prevent this horizontal travel of fluids and the force that comes with it, reducing the chances of damage to the tank.
Additionally, baffles can help to prevent issues with fuel oscillation. Without baffles, the fuel can start to oscillate, causing the aircraft to fly a wavy flight path. This can be dangerous as it can lead to pilot-induced oscillations when the pilot tries to correct the flight path.
In some cases, other methods are used to achieve similar results. For example, some combat aircraft use a coarse, sponge-like foam that takes up about 2% of the tank volume to effectively dampen fuel oscillations. However, in the case of a hard hit, the tank can still crack and rupture, spilling fuel.
Overall, baffles are an important feature of fuel tanks, especially in vehicles that are subject to rapid manoeuvres or crashes, as they increase the strength and durability of the tank by preventing the force of shifting fuel from impacting the tank walls.
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Frequently asked questions
Baffles are inner walls or partitions that prevent the fuel from sloshing around. They also increase the strength and durability of the tank.
Baffles in diesel fuel tanks prevent the fuel from sloshing around during manoeuvring, which can cause unwanted dynamics and pilot-induced oscillations.
Baffles for diesel fuel tanks can be made from HDPE plastics or metal. Some sources also mention the use of foam, specifically coarse, sponge-like foam, to dampen fuel oscillations.
All fuel tanks are fully baffled to prevent fuel sloshing and increase the strength of the tank. However, some sources mention that certain combat aircraft do not use baffles and instead rely on foam to dampen fuel oscillations.
Yes, as mentioned earlier, foam can be used as an alternative to baffles to dampen fuel oscillations. However, it is important to use a type of foam that is not dissolved by the fuel.
