
Fiberglass-reinforced plastic (FRP) is a material used in the construction of fuel storage tanks. FRP tanks are lightweight, durable, and highly resistant to corrosion, making them ideal for storing corrosive and inflammable liquids such as gasoline, diesel, aviation fuels, and petroleum products. They are also fire-retardant, which is crucial for the safe storage and transport of hazardous materials. FRP tanks are often used underground, where their structural integrity and leak-proof design prevent leaks and protect the surrounding soil and groundwater from contamination. While FRP tanks offer many advantages, some older fiberglass tanks have been found to degrade when exposed to ethanol-enhanced gasoline, leading to concerns about their long-term durability in certain applications.
| Characteristics | Values |
|---|---|
| Invention | Fiberglass underground fuel storage tanks |
| Usage | To store corrosive and inflammable liquids such as ethanol-blended fuels, biodiesel fuels, petroleum products, ultra-low sulfur diesel, gasoline, diesel, and aviation fuels |
| Manufacturing | Manufactured from polyester resins that are strengthened with glass fiber |
| Size | Can hold up to 50,000 gallons of liquids. Their sizes range from 4-foot diameter to 12-foot diameter |
| Multi-compartments | Multiple compartments allow keeping multiple products in the same tank |
| Corrosion resistance | Not susceptible to internal corrosion caused by aggressive microbial-induced corrosion |
| Fuel compatibility | UL-tested and UL-listed, making them compatible with ethanol and gasoline storage |
| Durability | Long lifespan if properly maintained, and can withstand soil movement and other external factors |
| Customization | Can be customized and manufactured in several sizes and configurations |
| Leak prevention | Engineered to be leak-proof, which is essential for environmental safety |
| Weight | Lightweight when compared to steel tanks |
| Maintenance | Require little maintenance and repairs |
| Fire-retardant | Can withstand extreme weather fluctuations |
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What You'll Learn
- Fiberglass underground fuel storage tanks are large vessels used for storing corrosive and inflammable liquids
- FRP tanks are engineered to be leak-proof, durable, and require little maintenance
- Fiberglass tanks are lightweight, have strong structural integrity, and can be customised
- Fiberglass tanks are susceptible to degradation from ethanol
- Fiberglassing gasoline tanks involves coating the tank with resin and cloth

Fiberglass underground fuel storage tanks are large vessels used for storing corrosive and inflammable liquids
One of the biggest advantages of using fiberglass underground fuel storage tanks is their resistance to corrosion. Unlike steel tanks, which are susceptible to internal corrosion caused by aggressive microbial-induced corrosion, fiberglass tanks do not face the same issue. This makes them ideal for storing highly corrosive liquids such as gasoline, petroleum, ethanol-blended fuel, biodiesel, and ultra-low-sulfur diesel.
The non-corrosive nature of fiberglass tanks also eliminates the possibility of rust, even in corrosive soil environments. This is especially important when storing liquids like ethanol, which can increase the likelihood of water in a storage tank, leading to rust and microbial-induced corrosion in steel tanks.
Fiberglass underground fuel storage tanks also offer enhanced protection against leaks and spills. Modern triple-walled tanks have secondary and tertiary walls designed to contain the fuel and prevent any spillage into the environment in the event of a breach in the primary tank. These tanks can hold up to 50,000 gallons of liquids and are often used in industries for storing multiple products in the same tank, reducing operation costs.
Additionally, with advancements in technology, new features are being added to the latest models of fiberglass underground fuel storage tanks. For example, double and triple-wall layered tanks can assess the interstitial space for reliability hydraulically or with sensors, enhancing their robustness and corrosion resistance.
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FRP tanks are engineered to be leak-proof, durable, and require little maintenance
Fiberglass-reinforced plastic (FRP) is a composite material that combines the strength of glass with chemical resilience. It is lightweight, durable, and highly resistant to corrosion, making it ideal for storing liquids such as chemicals, water, wastewater, fertilizer, oil, and fuel.
FRP tanks are engineered to be leak-proof, which is crucial for environmental safety. Their strong structural integrity means they can withstand the external pressure associated with being underground, and their resistance to corrosion safeguards the integrity of the stored fuel and prevents leaks. Additionally, FRP tanks are not susceptible to internal corrosion caused by aggressive microbial-induced corrosion, making them suitable for storing highly corrosive liquids such as gasoline, petroleum, and ethanol-blended fuels.
The durability of FRP tanks is another key advantage. They are long-lasting and can withstand soil movement and other external factors commonly encountered in underground applications. With proper maintenance, FRP tanks can have a long lifespan, and their lightweight construction simplifies transport, installation, and handling. Furthermore, FRP tanks require little maintenance compared to other storage tank materials, reducing overall maintenance costs.
While FRP tanks offer superior performance, they are not without their challenges. During the manufacturing process, care must be taken to avoid trapping air in the laminate, as this can lead to voids that negatively impact the mechanical properties of the material, potentially causing leaks, cracks, or damage. Additionally, FRP tanks are susceptible to chemical attacks and environmental conditions, with excessively high temperatures causing laminates to soften and become prone to erosion or other damage.
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Fiberglass tanks are lightweight, have strong structural integrity, and can be customised
Fiberglass-reinforced plastic (FRP) is a composite material that combines the strength of glass with the chemical resilience of plastic. It is corrosion-resistant, long-lasting, and durable, making it ideal for storing liquids. FRP tanks are also fire-retardant, which is crucial when dealing with flammable materials like petroleum products. They are lightweight compared to steel tanks, which makes them easier to transport, install, and handle. This is especially useful for underground fuel storage, where they can withstand the external pressure of being buried.
FRP tanks are engineered to be leak-proof, which is essential for environmental safety. Their durability means they can withstand soil movement and other external factors, ensuring that harmful substances do not contaminate the surrounding soil and groundwater. The strong structural integrity of FRP tanks also means they can be customised to address specific requirements and space constraints. They can be manufactured in various sizes and configurations while still accommodating the necessary volume of fuel storage.
FRP tanks are highly resistant to corrosion, which is crucial when storing corrosive liquids like petroleum and its derivatives. This resistance safeguards the integrity of the stored fuel and prevents leaks. FRP tanks are compatible with a wide range of fuels, including gasoline, diesel, aviation fuels, ethanol-blended fuels, biodiesel, and ultra-low-sulfur diesel. They can also be used for wastewater treatment applications.
The customisability of FRP tanks makes them a sought-after option for underground fuel storage. They can be customised to meet specific industry storage demands and can hold up to 50,000 gallons of liquid. FRP tanks require less maintenance and repair than other tank materials and can withstand extreme weather fluctuations, making them a reliable choice for fuel storage.
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Fiberglass tanks are susceptible to degradation from ethanol
Fiberglass tanks are widely used for storing corrosive liquids such as ethanol-blended fuels, biodiesel fuels, petroleum products, and ultra-low-sulfur diesel. They are manufactured from polyester resins that are strengthened with glass fiber. However, despite their popularity and advantages, fiberglass tanks are susceptible to degradation from ethanol.
BoatUS, for instance, received several complaints from boaters who owned older gas-powered boats with fiberglass fuel tanks after the Long Island Sound area of New York switched to gas mixed with ethanol. They observed that the tanks were being slowly dissolved by ethanol, with black deposits building up on valves and intakes, eventually destroying engines. Subsequent tests confirmed that the ethanol caused aggressive degradation of the tanks, resulting in resin softening and the loss of adhesion between the fiber and resin, leading to reduced strength and stiffness.
The issue appears to be limited to tanks manufactured before the mid-1980s when industry-wide changes in fiberglass resin formulations occurred. The ethanol additive was found to "attack" the resin in these older tanks, leading to weakened tank walls and bottoms, with some cases of tank wall failure and fuel leakage. This poses a significant risk of explosion when gasoline leaks into the bilge.
While modern fiberglass tanks are UL-tested and listed for compatibility with ethanol and gasoline storage, prolonged exposure to ethanol over 5-10 years can still cause slow degradation. This degradation may not be immediately apparent but can manifest suddenly, leading to pitting or leaks, resulting in safety hazards or engine performance issues. Therefore, regular inspections and replacements of degraded components are crucial to mitigate these risks.
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Fiberglassing gasoline tanks involves coating the tank with resin and cloth
Fiberglassing a gasoline tank is a detailed process that requires careful preparation and the right materials. The process involves coating the tank with resin and cloth to create a smooth, sealed surface. Here is a step-by-step guide to fiberglassing a gasoline tank:
First, cut the fiberglass cloth to fit the tank. The cloth needs to cover the bottom and sides of the tank. For irregular or round tanks, you may need multiple pieces of cloth to fully cover the surface. It is important to overlap these cuts by about half an inch wherever possible. Once the cloth is cut, set it aside.
Next, prepare the resin. It is important to mix only enough resin for a thin coat on the tank, as it will harden quickly after mixing. Follow the mixing directions provided by the manufacturer, as different brands may have varying instructions. Remember, once the resin is mixed, it cannot be stored, so only mix what you need for a single coat.
Apply the resin to the tank, creating a thin, even coat. This initial layer of resin will help the cloth adhere to the tank's surface. Allow this first coat to dry completely.
Now, it's time to apply the fiberglass cloth. Smooth the cloth over the tank, ensuring it adheres to the resin layer below. Take care to avoid any air bubbles or creases in the cloth, as these can create weak spots in the finished product.
Once the cloth is in place, apply another coat of resin over it. This second coat will help seal the cloth in place and provide additional strength. Allow this coat to dry completely.
After the second coat has dried, apply additional coats as needed. The number of coats depends on your specific requirements and the desired smoothness of the final product. Remember to allow each coat to dry completely before applying the next one.
Finally, once the last coat has dried, sand or grind any rough spots to create a smooth finish. Feather the edges where the fiberglass ends to ensure a seamless transition. You can then paint the tank, and it will be ready for use.
Fiberglassing a gasoline tank requires patience and attention to detail. It is important to follow the instructions provided by the manufacturers of the resin and cloth products you are using, as well as taking the necessary safety precautions when working with gasoline and resin.
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Frequently asked questions
Fiberglass-reinforced plastic (FRP) is a composite material that blends the strength of glass with chemical resilience. FRP tanks are specifically designed for the oil and gas industries and are used for storing and transporting various types of fuels, including gasoline, diesel, and aviation fuels.
FRP tanks offer several advantages over traditional steel and alloy tanks. They are corrosion-resistant, durable, lightweight, and customizable. FRP tanks can also withstand extreme weather conditions and external pressure, making them ideal for underground fuel storage. Additionally, they are fire-retardant and leak-proof, enhancing safety and preventing environmental contamination.
While FRP tanks are known for their durability, certain factors can cause degradation. For example, exposure to ethanol has been found to dissolve the resin in fiberglass tanks, leading to a loss of strength and stiffness. This issue has been observed in older gas-powered boats and yachts that switched to gasoline containing ethanol.
To mitigate the effects of ethanol, some resin manufacturers have developed resins that are resistant to ethanol. However, simply coating a tank with these resins is not sufficient. The tank must undergo thorough cleaning and preparation, and the resins require special curing processes.
Fiberglass fuel tanks can be customized to meet specific requirements. Modern units can range from 4 to 12 feet in diameter and hold up to 50,000 gallons of liquids. Industries typically utilize tanks with a 10-foot diameter to maximize storage capacity.










































