Mercedes Mullins
A gas fuel tank is a container used to store natural or manufactured gas that fuels a vehicle. They are typically made of metal or plastic and come in various sizes depending on the vehicle's needs. Gas tanks can be found in cars, trucks, aircraft, and motorcycles. The size of a gas tank is essential, as a larger tank allows for a greater range for the vehicle, but the weight and space requirements can be undesirable. Gas tanks are designed with safety features to manage fuel vapors and prevent leaks, which can lead to catastrophic failure.
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What You'll Learn
Gas tank composition
The composition of a gas tank depends on the type of gas being stored, the application, and the specific requirements of the vehicle or system in which it is installed. Here is an overview of the common compositions of gas tanks:
Metal Gas Tanks
Metal fuel tanks are commonly made of steel, aluminium, or titanium. Metal tanks are typically constructed by welding together stamped sheet metal parts. Metal is a preferred material for gas tanks due to its strength, durability, and ability to withstand corrosion and extreme temperatures. Metal tanks are often used in vehicles, aircraft, and other applications where safety and structural integrity are crucial.
Plastic Gas Tanks
Plastic fuel tanks, made from high-density polyethylene (HDPE), are also commonly used, especially for short-term fuel storage. Plastic tanks are usually manufactured through blow molding, which allows for more complex shapes. However, plastic tanks have the potential to become saturated by fuels like diesel and gasoline over time, leading to environmental stress cracking and possible catastrophic failure due to fuel flammability. Therefore, plastic tanks may be more suitable for temporary or less hazardous applications.
Composite Gas Tanks
Cylindrical tanks made of composite materials are often used for storing compressed natural gas (CNG). These tanks have an inner shell made of corrosion-resistant and lightweight materials like aluminium, titanium, or stainless steel. The outer layers are composed of inorganic fibres such as fibreglass and inorganic bonding materials like epoxy. Composite tanks offer advantages such as low weight, high fracture resistance, and stable chemical properties.
Bladder Tanks
Bladder tanks, also known as fuel cells, are reinforced rubberized bags used in aircraft to maximize fuel storage capacity. These bladders are secured inside the aircraft's structure and can conform to the available space. Bladder tanks are susceptible to work hardening, which can make them brittle and prone to cracking over time. However, they are effective in utilizing as much space as possible for fuel storage in aircraft.
Coating Treatments
Coating treatments are often applied to gas tanks, especially in the aerospace industry, to enhance their performance and durability. Tagnite coating, for example, provides superior corrosion resistance and serves as an excellent base for paint. Keronite treatment is another approved pre-treatment for housings, providing a durable coating with long service intervals when combined with a topcoat system.
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Gas tank construction
When constructing a gas tank, several factors must be considered during the design phase. These include determining the tank's size, shape, and capacity based on factors such as the required storage volume, site constraints, and environmental considerations. Additionally, it is crucial to evaluate corrosion resistance, seismic design, and accessibility for maintenance to ensure the tank's longevity and functionality.
The construction process typically involves multiple phases, including site preparation, foundation installation, tank erection, and final inspection. Site preparation involves clearing and levelling the area, followed by excavation for the tank foundation. The foundation, usually made of reinforced concrete, provides stability and support for the tank structure.
The actual construction of the tank varies depending on the materials used. Metal (steel or aluminium) fuel tanks are often built by welding stamped sheet metal parts together. Plastic fuel tanks, on the other hand, are commonly constructed using blow moulding, allowing for more complex shapes.
In the case of underground fuel tanks, regular maintenance is essential to maintaining optimal tank and soil conditions. Compressed natural gas (CNG) fuel systems require safety inspections and adherence to expiration dates to ensure their safety and functionality. Above-ground fuel tanks require vigilant maintenance, including protecting against water intrusion and preventing contaminants to maintain fuel integrity.
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Gas tank maintenance
A gas fuel tank is a closed container impermeable to natural gas, with sufficient volume to store fuel to run the engine for a desired period. Gas fuel tanks are usually made of metal or plastic. Metal (steel or aluminium) fuel tanks are usually built by welding stamped sheet metal parts together. Plastic fuel tanks are usually built using blow moulding, which allows for more complex shapes.
Placement and Setup
When installing a new gas tank, it is important to consider its placement and setup. Above-ground storage tanks (ASTs) are generally easier to maintain and relocate than underground storage tanks. When placing an AST, ensure it is in a designated outdoor area, as indoor or underground tanks may not withstand outdoor elements such as sunlight and high temperatures. It is also recommended to orient the tank in an east-west direction to reduce exposure to solar radiation, which can cause fuel tank weathering over time.
Regular Inspections and Checks
Regular inspections and checks are crucial to maintaining your gas tank. Each season brings its own challenges, so it is important to adapt your maintenance routine accordingly. For example, during autumn and winter, regularly inspect your tank for any damage caused by extreme weather conditions, such as storms and freezing temperatures. Additionally, check for fallen trees, branches, or debris that may have blown into the tank. Spring and summer are good opportunities to perform more comprehensive checks and tests to ensure your tank is in good working order.
Cleaning
Cleaning your gas tank is an essential part of maintenance. While regulations vary, it is generally recommended to clean your tank annually to prevent microbial contamination and sludge formation. This involves monitoring and removing water, filtering the fuel, killing microbes, and cleaning sludge and dead organic matter. Proper disposal of any fuel, residue, or chemicals should be done in accordance with local regulations. Additionally, it is important to keep the area around your tank clear of debris, vegetation, and any excess moisture, as this can lead to corrosion.
Leak Prevention
Leak prevention is critical for gas tank maintenance. Consider investing in a double-walled tank or including a secondary containment area to reduce the risk of leaks. Advanced monitoring systems can also be used to continuously check for leaks, temperature changes, or other signs of potential issues.
Safety Measures
Gas tanks should be properly fire-guarded or vaulted to ensure fuel does not ignite in an emergency. The fire guard should be strong enough to prevent ignition for at least two hours during a fire, unless the flashpoint is higher than 100 degrees Fahrenheit. Additionally, be mindful of the materials used in your gas tank, as certain plastics may become saturated over time, leading to potential environmental stress cracking and catastrophic failure.
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Gas tank safety
Gas fuel tanks are used to store fuel and power engines. They are used in various vehicles, including cars, aircraft, and boats. Gas tanks are typically made of metal or plastic and can be single-walled or double-walled. Single-walled tanks are more susceptible to corrosion and leaks, while double-walled tanks offer more protection.
When it comes to gas tank safety, there are several important considerations and guidelines to follow:
Installation and Location
Firstly, it is crucial to install gas fuel tanks in suitable locations away from potential hazards. This includes keeping a safe distance from ignition sources, high-traffic areas, and buildings. For example, portable fuel tanks should be placed at least 20 feet away from any structures. Additionally, consider local regulations, guidelines, and permits regarding the installation of fuel tanks.
Maintenance and Inspections
Regular inspections and maintenance of gas fuel tanks are essential to identify and address any issues promptly. Check for signs of corrosion, leaks, structural damage, or deterioration. Schedule routine maintenance to ensure that all components, including valves, pumps, and gauges, are in proper working order. Keep detailed records of inspections, maintenance, and repairs for reference and compliance.
Safety Equipment and Protocols
It is vital to prioritize safety protocols and provide employees with proper training on the potential risks associated with fuel storage tanks, including fire hazards and fuel spillage. Ensure that appropriate personal protective equipment (PPE) is worn when working near or handling fuel tanks. Install fire safety equipment, such as fire extinguishers, fire alarms, and smoke detectors, in the vicinity of the fuel storage tanks, and regularly test and maintain this equipment. Develop and communicate an emergency response plan to outline the procedures in case of a fire or fuel-related incident.
Spill and Leak Prevention
Use specialized containers and equipment designed for fuel transfer to minimize the risk of spills and accidents. Ensure that all fuel transfer connections and valves are secure and properly maintained. If a fuel tank is not double-walled, provide a spill kit in a conspicuous location. Regularly inspect and maintain fuel transfer equipment to prevent leaks or malfunctions.
Compliance with Regulations
Be aware of and comply with relevant regulations and standards, such as those set by the Environmental Protection Agency (EPA), your local Department of Natural Resources (DNR), and industry-specific guidelines like OSHA. Understand the physical requirements for compliant tanks, such as double-walled construction or specific coating materials to prevent corrosion.
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Gas tank size and capacity
The size and capacity of a gas fuel tank are crucial aspects to consider when understanding how a vehicle operates. The fuel tank size of a vehicle varies depending on the type and model of the car. Typically, the average fuel tank capacity for cars is 50–60 litres (12–16 US gallons). This range allows for a balance between the vehicle's weight and its travel range. For example, a compact car might have a smaller tank size of around 12 gallons, while a mid-sized sedan might have a 16-gallon tank. Larger vehicles like trucks and SUVs often have larger fuel tanks to support their higher fuel consumption rates.
The size of a propane tank for home use depends on its application, the size of the home, and the number and size of appliances using propane. Propane tank sizes can range from portable 20-pound containers (4.6 gallons when full) to tanks that can hold over 2,000 gallons. For example, a 500-gallon propane tank holds 400 gallons of propane when full, while a 1,000-gallon tank holds 800 gallons.
In the case of CNG tanks, the maximum mass of the gas carried is determined by the total size of the tank(s) and the maximum pressure of the gas. CNG tanks are often cylindrical and made of layered composite materials with an impermeable inner shell, usually aluminium due to its corrosion resistance, lightweight, and low cost. LNG tanks carry more fuel mass than a CNG tank of the same size but tend to be more expensive and heavier. LNG tanks are preferred for long-haul trailers, while CNG tanks are suitable for transit buses in big cities where fuelling stations are easily accessible.
It is important to note that the rated capacity of a fuel tank is only an estimate, and the actual fuel tank capacity refers to the maximum amount of fuel it can hold. This capacity is usually indicated in the vehicle's manual or on a sticker inside the fuel door.
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Frequently asked questions
A gas fuel tank is a container used to store natural or manufactured gas to supply a vehicle or engine.
Gas fuel tanks can be made of metal (steel or aluminium) or plastic (high-density polyethylene HDPE). Metal tanks are made by welding stamped sheet metal parts together, while plastic tanks are made using blow moulding.
Plastic gas fuel tanks are functionally viable in the short term but have the potential to become saturated by fuels such as diesel and gasoline over time. Plastic tanks are also more susceptible to stress cracking due to the flammability of fuel. However, they allow for more complex shapes and are suitable for short-term fuel storage.
The type of gas fuel tank used depends on the vehicle and the travel distance required. For long-haul trailers, LNG (liquefied natural gas) tanks are preferred as they carry more fuel mass than CNG (compressed natural gas) tanks. CNG tanks are a good option for transit buses in cities with easy access to fuelling stations. Aircraft may use bladder tanks, which are reinforced rubberized bags that maximize fuel storage space.
