Regan Brown
Fuel tanks are containers that store ignitable fluids and are crucial for the operation of vehicles, generators, and equipment. The design and construction of fuel tanks involve considering various factors such as material selection, size and shape, safety features, and maintenance access. Several companies specialize in manufacturing fuel tanks, including YAPP Automotive Systems, Textron, Fuel Total Systems, and Yachiyo, each offering unique expertise and innovations. Additionally, custom fuel tanks can be crafted by skilled craftsmen or companies according to specific requirements, showcasing a range of options for those seeking better-built fuel tanks.
| Characteristics | Values |
|---|---|
| Material | Steel |
| Gauge | 10-12 |
| Baffles | Yes |
| Lifting Eyes | Yes |
| Powder Coat | No |
| Primer and Paint | Yes |
| Leak Testing | Yes |
| Custom Parts | Yes |
| On-Time Delivery | Yes |
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Welding techniques
Welding a fuel tank is a potentially dangerous activity that should only be performed by professionals or under professional supervision. It is imperative to ensure that the tank is purged of any flammable vapours before welding. One way to do this is to fill the tank with an inert gas, such as argon, CO2, or nitrogen, and maintain a steady flow while welding. Another suggested method is to fill the tank with water to a level above the leak, which will prevent oxygen from getting in. However, water may not be a safe option, as welding a tank containing water can be challenging due to the expanding gases or steam pressurising the tank. Draining the tank and leaving it open in the sun to evaporate any remaining vapours is also not recommended, as the vapour-to-air mixture could result in an explosion.
Before welding, it is essential to wear protective gear, such as gloves, to ensure safety. Additionally, it is crucial to be aware of the potential risks and take the necessary precautions. For example, if a welding blowpipe or burner is used on a tank containing flammable material, it can explode violently, causing serious injuries or even death.
When it comes to the welding process itself, there are different techniques that can be used. One common method is Metal Inert Gas (MIG) welding, which is suitable for welding steel tanks. MIG welding is well-suited for seam runs without applying excessive heat and causing warping. Test joints are recommended to dial in the settings, and it is important to cut the material to allow for open corner welds, filling in the corners with full thickness. To avoid cold laps, it is suggested to feather the starts and overrun the stops, performing the tacks on the inside and leaving the open corner joints as clean runs.
Another welding technique mentioned is Tungsten Inert Gas (TIG) welding, which is typically used for small or stainless tanks but is often unnecessary for larger ones. When welding a fuel tank, it is recommended to include baffles, which should be stitch welded to the sides and bottom. Additionally, the top, bottom, and ends should be formed to allow for as many lap welds as possible, and corner welds should be avoided if possible, using 6010 to get it right the first time.
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Baffles and seams
Baffles are used in fuel tanks to control the sloshing of fuel during manoeuvres, which can cause unwanted shifts in the centre of gravity and lead to pilot-induced oscillations. Baffles can be welded into the tank during construction, or added later as an aftermarket modification. Some common baffle designs include foam inserts, which take up space in the tank and dampen oscillations, and wiffle balls, which are cut in half and placed inside the tank. In addition to baffles, fuel tanks can also be designed with seams that provide structural integrity and help to prevent leaks.
The use of baffles and seams in fuel tank design is an important consideration for maintaining the safety and performance of the tank. By controlling the movement of fuel, baffles help to prevent accidents and improve the stability of the vehicle or aircraft. Seam construction and placement also play a critical role in ensuring the tank's structural integrity and preventing fuel leaks, which could pose safety hazards.
When designing and constructing fuel tanks, it is crucial to consider the specific application and operating conditions. For example, the size and shape of the tank should be optimised for the available space and the fuel requirements of the equipment or vehicle. Additionally, the material selection for the tank and baffles is critical to their performance and longevity. Different materials offer varying levels of strength, durability, and resistance to corrosion and chemical attack.
Some common materials used for fuel tank construction include steel, which is popular due to its high strength-to-weight ratio and resistance to impact damage, and fiberglass-reinforced polymer (FRP), which offers excellent corrosion resistance and durability. However, steel tanks can be prone to corrosion if not properly coated or treated. High-density polyethylene (HDPE) is another option that is resistant to corrosion and can be used for a wide range of fuel types.
In addition to material selection, fuel tank designers must also consider environmental factors such as temperature, humidity, and exposure to chemicals or corrosive substances. Applying protective coatings or linings to the tank can help to prevent corrosion and chemical attack. Insulation is also important for maintaining a stable temperature and preventing condensation. By considering these factors and incorporating baffles and seams into the design, manufacturers can build safer and more efficient fuel tanks.
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Powder coating
However, it is important to be aware of the limitations of powder coating. The finish may not be as smooth or glossy as a high-quality paint job, and it may not be suitable for all fuel tank materials. For example, some tanks are made with plastic or lead filler, which cannot withstand the high temperatures required for powder coating. Powder coating is also not recommended for tanks with silver solder inside, as the baking process can cause the solder to melt and ruin the tank.
In addition, powder coating may not be as chemically resistant as other finishes. Some users have reported issues with the powder coating becoming soft and turning to goo after exposure to gas, lacquer thinner, or brake fluid. It is also important to note that powder coating can be more difficult to apply than traditional paint, requiring a curing box and specific temperature controls.
Despite these limitations, powder coating can be a viable option for those looking for a cost-effective and durable finish for their fuel tanks. It is important to consider the specific requirements and limitations of the application before deciding on a finish. For those with specific colour or finish requirements, powder coating offers a wide range of options to choose from.
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Leak testing
Soapy Water Test
The soapy water test is a simple, effective, and low-cost method for leak testing fuel tanks. This test can be performed by a quality control (QC) team even in basic factory settings. The procedure involves using a new tank and sealing all openings except for the inlet. Compressed air is pumped into the tank through the inlet, with a recommended pressure of no more than 5 PSI. Simultaneously, the tank is covered with a solution of soapy water (a mixture of standard detergent and water). If there are any leaks, the soapy water will begin to bubble, indicating the presence and location of the leak. This method is advantageous due to its simplicity, low equipment cost, and effectiveness in detecting leaks in the tank and other components, such as hoses and gaskets.
Automated Leak Testing Solutions
Companies like Mikro Innotech India Pvt Ltd offer automated leak testing solutions for the automotive, pharmaceutical, and manufacturing industries. These solutions include assembly automation robotics and electrical testing equipment. Their machines are designed to streamline production and assembly processes while providing accurate leak testing results. The use of advanced technology, such as precise current testing and cam specifications, enhances the accuracy and efficiency of the leak testing process.
Custom Leak Test Devices
Custom leak test devices, such as the one designed by Proportion-Air, can be tailored to specific needs. Their device is designed to fill and maintain pressure in a Part Under Test (PUT). It uses a high-flow digital valve and a proportional valve to rapidly fill large volumes. The pressure is maintained at a set point, and if a leak is present, the flow meter detects the flow rate, which is recorded by a PLC. Such custom solutions can be designed to fit unique requirements and provide accurate leak testing capabilities.
Other Considerations
When it comes to leak testing fuel tanks, it is important to consider the potential hazards associated with fuel leaks. Therefore, proper documentation of any detected leaks is crucial. Repairs should be conducted before the tank is shipped or installed to ensure safety and avoid additional expenses. Leak testing is also recommended for imported tanks to ensure they meet the required standards and to identify any defects before they are put into use.
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Customisation
For instance, a user on a welding forum expressed their intention to build a diesel fuel transfer tank because they couldn't find a commercial option that fit their needs and budget. They specified their desired dimensions, materials, and additional features, such as a 2" filler and pump with a drain for cleanout and two lifting eyes.
Another user provided detailed instructions on how to build a fuel transfer tank, including the materials and tools required, such as a 12-gauge A36 plate, a shear, a break, a tig weld, and the installation of baffles and fuel tank bungs. This user also recommended using primer and paint instead of powder coating for a more durable finish.
Additionally, custom-built fuel tanks can be designed to meet specific capacity requirements. For example, a user shared their experience building an 80-gallon fuel transfer tank for their truck, taking into account the available deck length and their desire to keep the tank below the rear window for better visibility.
Boyd Welding LLC, a company specialising in custom aluminium tanks, highlights their ability to manufacture most parts in-house, allowing them to offer customisation options and maintain supply flexibility. They also emphasised the importance of leak testing, with each of their tanks undergoing a rigorous underwater testing process to ensure quality and reliability.
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Frequently asked questions
Better Built is a brand of fuel transfer tanks that can be fitted into the bed of pickup trucks.
Fuel transfer tanks are tanks that can be used to store and transfer fuel. They can be used to store flammable or non-flammable liquids.
Better Built fuel tanks are made from steel or aluminum.
The construction of Better Built fuel tanks involves welding, with specific techniques and considerations recommended by builders, such as using lap welds, corner welds, and forming the tank into a "U" shape.
Each Better Built fuel tank undergoes a documented leak testing process, where they are tested underwater between 5-8 PSI and individually reviewed before being serially numbered.
