Ameer Randolph
Fuel tanks are containers that store flammable fluids, such as gasoline or diesel fuel, and provide these fuels to engines. They come in various sizes and complexities, from small plastic tanks in lighters to multi-chambered cryogenic tanks in spacecraft. Fuel tanks are typically made of metal and must be carefully constructed to prevent leaks and ignition sources, which could lead to fires or explosions. The coatings used on fuel tanks are crucial for preventing corrosion and contamination of the fuel. Fuel tanks are commonly found in vehicles, aircraft, and stationary locations, with the specific design and construction varying based on their intended use.
| Characteristics | Values |
|---|---|
| Definition | A fuel tank is a safe container for flammable fluids, often gasoline or diesel fuel. |
| Other Names | Petrol tank, gas tank |
| Construction | A craftsman creates a mockup to determine the size and shape, then addresses design issues, such as where the outlet, drain, fluid level indicator, seams, and baffles go. The thickness, temper, and alloy of the sheet are determined, and the sheet is cut and bent to create the basic shell and/or ends and baffles. Baffles and ends are riveted, soldered, or welded, and the tank is leak-tested. |
| Types | Rigid removable tanks, bladder tanks or fuel cells |
| Protection | Burying stationary fuel tanks can protect them from temperature extremes and vehicle crashes, but monitoring for leaks is difficult. |
| Hazards | Fuel tank leaks can cause pool fires during collisions. Electrostatic discharges near a tank being filled may cause fires or explosions. |
| Safety Measures | Eliminating ignition sources in the fuel tank ullage and inerting the center wing tank by separating and adding nitrogen to reduce the probability of an explosion. |
| Coatings | Coatings must prevent contamination of fuel and corrosion damage to the tank. They should be resistant to aliphatic and aromatic petroleum products. |
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What You'll Learn
Fuel tank construction
Fuel tanks are containers that store flammable fluids, such as gasoline or diesel fuel, and provide these fuels to engines. They range in size and complexity, from small plastic tanks in lighters to multi-chambered cryogenic tanks in spacecraft.
The construction of a fuel tank follows specific steps to ensure safety and functionality. Firstly, a mockup is created, typically out of foam board, to determine the size and shape of the tank. This step is crucial to identify any design issues that may affect the tank's structure, such as the placement of outlets, drains, and fluid level indicators. Next, the craftsman must select the appropriate material for the tank, considering factors such as corrosion resistance, weight, and ease of welding. Common materials include mild steel, stainless steel, aluminium, and poly.
After selecting the material, the sheet metal is cut into the required shapes, and the pieces are bent to form the basic shell, ends, and baffles of the tank. Baffles are essential in reducing sloshing and can be further reinforced with rivets to prevent leaks. Once the basic structure is assembled, openings are added for the filler neck, fuel pickup, drain, and fuel level sending unit.
The final stage of construction involves coating the tank to prevent corrosion and contamination of the fuel. Coating materials must be resistant to aliphatic and aromatic petroleum products. A three-coat epoxy system is commonly used, providing a total thickness of 250-300 μm. It is important to note that certain materials, such as zinc, should be avoided as they can dissolve into the fuel and cause engine problems.
For stationary fuel tanks, burial is an economical way to protect them from temperature extremes and vehicle crashes. However, these tanks are challenging to monitor for leaks, leading to environmental concerns. In the aerospace industry, fuel tank sealants are commonly applied to provide resistance to various fluids, including water and petroleum-based hydraulic fluids.
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Fuel tank safety
Design and Construction
Fuel tanks are designed and constructed to withstand various stresses and forces, including changes in temperature, pressure, and altitude. They are typically made from resilient materials such as aluminium alloys or composite materials, engineered to resist corrosion and leakage. During the design and construction process, craftsmen must carefully determine the size, shape, and thickness of the tank, as well as the placement of outlets, drains, fluid level indicators, seams, and baffles.
Coating and Corrosion Prevention
Coatings play a crucial role in fuel tank safety. They must prevent contamination of the fuel by corrosion products and protect the tank from corrosion damage. Epoxy coatings are commonly used, as they are resistant to aliphatic and aromatic petroleum products. Zinc coatings, on the other hand, should be avoided, as zinc can dissolve into the fuel and cause engine problems.
Installation and Location
For stationary fuel tanks, burying them is an economical way to protect them from hazards like extreme temperatures and vehicle crashes. However, this makes leak monitoring challenging and raises environmental concerns. For on-site fuel storage tanks, it is essential to install them in suitable locations away from potential hazards, such as ignition sources, high-traffic areas, and buildings.
Maintenance and Inspection
Regular inspections and maintenance are vital to fuel tank safety. This includes checking for corrosion, leaks, or structural damage, as well as ensuring that all components, such as valves, pumps, and gauges, are in proper working order. Proper maintenance of fuel lines, pumps, valves, and filters within the fuel system is crucial to prevent defects or damage that could lead to leaks or malfunctions.
Safety Protocols and Training
Strict safety protocols must be followed when working with fuel tanks. This includes the use of personal protective equipment (PPE), specialized containers, and tools designed for fuel transfer to minimize the risk of spills and accidents. Additionally, employees working with fuel tanks should receive comprehensive training on potential risks, safety protocols, and emergency response plans.
Fire Safety and Explosion Prevention
Fuel tanks contain flammable fluids, making fire safety and explosion prevention critical considerations. This includes grounding procedures to prevent static electricity buildup, compatibility between fuel types and systems, and avoiding overfilling to prevent vapour buildup and pressure spikes that could lead to explosions. Inerting systems, which replace oxygen with inert gases like nitrogen, are also used to reduce the risk of fire or explosion by maintaining a non-flammable atmosphere within the tank.
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Fuel tank coatings
Fuel tanks are containers that store flammable fluids, such as gasoline or diesel fuel, and provide them to an engine. They range in size from small plastic tanks in lighters to multi-chambered cryogenic tanks in spacecraft. Fuel tanks are typically made of metal, but they can also be made of plastic or fiberglass.
Fuel tanks are designed to prevent leaks and limit evaporative emissions. However, leaks can occur, and this can lead to fires or explosions, especially in the case of vehicle collisions. To mitigate this risk, fuel tanks can be buried, or a vapor recovery system can be used to reduce the concentration of flammable vapors during refuelling.
There are several types of coatings available for fuel tanks. One common type is the epoxy coating, which provides excellent resistance to fluids such as water, alcohols, synthetic oils, and petroleum-based hydraulic fluids. A three-coat epoxy system with a total thickness of 250-300 μm has been found to be effective in preventing corrosion and resisting petroleum products. Phenol novolac epoxies are a newer type of epoxy coating that exhibits superior chemical resistance and bond strength. They can withstand permanent immersion in harsh solvents, fuels, and oils, including ethanol-based fuels.
Other fuel tank coatings include the POR-15 Fuel Tank Sealer, which is a high-tech sealer impervious to various fuels, including diesel, E10 ethanol, and high alcohol content fuels. It acts as a liner, preventing rust, corrosion, and small leaks. Before applying any coating or sealer, it is important to ensure that the fuel tank is clean, free from contaminants, and structurally sound. This may involve removing old sealers, degreasing, and etching the metal for better adhesion of the new coating.
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Fuel tank fires
Fuel tanks are containers that store flammable fluids, such as gasoline or diesel fuel, and provide these fuels to engines. They range in size from small plastic tanks in lighters to the multi-chambered cryogenic Space Shuttle external tank. Fuel tanks are typically made of metal, and their construction follows a series of specific steps to ensure safety and prevent leaks.
However, fuel tank fires and explosions can occur, often with devastating consequences. For example, a fuel tank explosion in northern Lebanon in 2021 killed at least 28 people and injured 79. Fuel tank fires and explosions can occur in vehicles, such as cars, trucks, and SUVs, as well as in stationary fuel tanks and fuel storage facilities.
Vehicle collisions can result in fuel tank fires, as automotive fluids can spill within the engine compartment or onto the ground, igniting from various sources such as headlights or running lights. In the past, design flaws have also led to vehicles catching fire and exploding during collisions, as in the case of the Ford Pinto and General Motors "side-saddle" pick-up truck. It is crucial for fuel pumps to shut off in the event of a collision to prevent the continuous flow of gasoline, which can fuel a fire.
Stationary fuel tanks can be protected from hazards like extreme temperatures and vehicle crashes by burying them. However, this makes leak monitoring difficult, and electrostatic discharges during refueling can still cause fires or explosions. Fuel storage facilities are also vulnerable to fires, as human errors during fuel transportation can result in blazes, as seen in the Zahrani oil facility fire in Lebanon.
To mitigate the risk of fires and explosions, various safety measures are implemented. In vehicles, safety regulations aim to reduce the likelihood of post-crash fires, and fuel tank design and placement are critical factors. In aircraft, the use of nitrogen in the center wing tank helps decrease the probability of an explosion by separating nitrogen and oxygen. Additionally, vapor recovery systems can reduce the concentration of flammable vapors during refueling, minimizing the risk of fires and explosions.
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Fuel tank sealants
A fuel tank is a container from which an engine draws its fuel. Fuel tanks are designed to store flammable fluids, such as gasoline or diesel fuel. They are typically constructed out of metal and come in various sizes, ranging from small plastic tanks in lighters to multi-chambered cryogenic Space Shuttle external tanks.
Fuel tank safety is a critical aspect of their design, aiming to prevent ignition sources from entering the tank and causing fires or explosions. One method to achieve this is by inerting the center wing tank, separating nitrogen from oxygen and adding nitrogen to reduce the probability of an explosion. Additionally, coatings and sealants play a vital role in fuel tank maintenance and safety.
The application process for fuel tank sealants typically involves cleaning and drying the tank before applying the sealant. After coating, the tank is drained to remove excess sealant. It is important to ensure proper chemical interaction for the sealant to effectively bond to the tank's interior.
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Frequently asked questions
A fuel tank is a container for flammable fluids, often gasoline or diesel fuel. It is usually made of metal and can be found in vehicles, from cars to airplanes.
The craftsman creates a mock-up to determine the size and shape of the tank, then addresses design issues like outlet placement. The thickness, temper, and alloy of the sheet metal are determined, and the pieces are cut and bent to form the shell and ends. Baffles with lightening holes are added to reduce weight and increase strength. Finally, openings are cut for the filler neck, fuel pickup, and other components.
Fuel tank safety aims to prevent ignition sources from entering the tank and causing fires or explosions. This is especially important for center wing tanks in airplanes. The FAA is developing inerting systems that separate nitrogen from oxygen and add nitrogen to the tank to reduce the probability of explosions.
One challenge is preventing leaks, which can cause environmental hazards, especially with underground storage tanks. Another issue is corrosion, which can contaminate the fuel and damage the tank. Coatings are applied to resist corrosion, but they must be compatible with the type of fuel.
