Rajan Wilcox
Fuel tanks at gas stations are typically located underground, with the majority containing gasoline and less than 10% containing diesel fuel. These underground storage tanks (USTs) are designed to maximise available space and protect against physical damage and fire hazards. They are engineered with safety measures to prevent fuel from coming into contact with the surroundings, including sensors, alarms, and automatic shut-off switches to prevent overfilling and spills. Additionally, these tanks employ physical and chemical techniques to inhibit corrosion, and some are designed as double-walled structures with brine in the hollow area to enhance safety and leak detection. Modern dispensers and piping systems further contribute to safe and efficient fuel distribution at gas stations.
| Characteristics | Values |
|---|---|
| Location | Underground or above-ground |
| Purpose | To store fuel safely and efficiently |
| Capacity | 30,000-40,000 gallons |
| Composition | Single-walled or double-walled, corrosion-resistant coating, made of structural steel or fiberglass |
| Ventilation | Venting systems to release vapours and prevent explosions |
| Safety Features | Sensors, alarms, automatic shut-off switches, brine-filled walls, line leak detectors, float sensors, ball float valves, backup flapper valves |
| Maintenance | Regular inspections, oil spill cleanups, soil contamination treatment, testing, tank cleaning, painting and coating |
| Upgrades | Modular design for easy upgrades, modern dispensers with mobile apps and loyalty platforms |
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What You'll Learn
Underground fuel tanks
Gas stations are mostly flat stretches of land with no visible storage units. However, they contain vast supplies of fuel stored in underground vessels. These underground fuel tanks are designed to hold volatile fuel in the safest possible manner. They are also known as underground storage tanks (USTs) and are engineered to store fuel in the safest possible manner.
UST systems include the tank, underground connected piping, underground ancillary equipment, and any containment system. The federal UST regulations apply only to UST systems storing petroleum or certain hazardous substances. These regulations were developed by the U.S. EPA in 1988, which delegated regulatory authority to approved state programs. In 2015, the EPA revised the UST regulations, which included requirements for record-keeping to prove compliance with certain safety requirements.
There are two main types of fuel tanks: subway and aboveground. Subway tanks are the most common type as they maximise available space. They are buried underground to protect them from physical damage and reduce fire hazards. They can be manufactured as single or double-wall tanks. Single-walled tanks are more economical but present the risk of fuel leakage if the wall breaks. Double-walled tanks provide greater safety by preventing leaks from reaching the environment. The space between the two walls can be filled with brine, and safety systems can detect leaks by monitoring the pressure of the brine.
To prevent corrosion, metal tanks may employ physical and chemical corrosion inhibition techniques. Physical techniques include the application of specialised coatings, while chemical techniques involve installing a sacrificial plate inside the tank. Newer tanks are made from fiberglass, which is rust-proof, or steel coated with fiberglass to prevent corrosion. Ventilation systems are also installed to prevent the accumulation of flammable gases and reduce the risk of explosions.
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Safety measures
Fuel is stored in underground vessels at gas stations, in tanks that have been designed to hold volatile fuel in the safest possible manner. These tanks are engineered to prevent the fuel from coming into contact with their surroundings as much as possible.
Underground Storage Tanks
Underground storage tanks are designed to protect against physical damage and reduce fire hazards. They are manufactured as single or double-walled tanks. Single-walled tanks are more economical but present the risk of fuel leakage if the wall is broken. Double-walled tanks provide greater safety by preventing leaks from reaching the environment. The space between the two walls is filled with brine, and if there is a leak, the increase in brine level can be detected.
Ventilation Systems
Storage tanks have ventilation systems that allow for the controlled release of vapors. This prevents the accumulation of flammable gases and reduces the risk of explosions.
Spill Prevention and Response
Spill containment systems should be implemented around fuel storage tanks and during transfers to prevent spills. Spill response kits should be readily available, and employees should be trained to respond to spills and properly dispose of spilled fuel and contaminated materials.
Sensor and Alarm Systems
Sensors and alarms notify operators when the tank is getting full, and automatic shut-off switches stop fuel from being pumped into the tank before it overflows.
Safe Handling Procedures
Smoking should be strictly avoided in areas where fuel is received and stored. Approved containers and portable fuel tanks should be used, and fuel should be poured outside in an open area using a spout or funnel to avoid spills. When refueling, never leave the pump unattended, and always keep a fire extinguisher close by.
Traffic Control and Barriers
Implement a safe system of traffic movement, such as a one-way system for entering and exiting the parking lot. Install barriers to protect vulnerable structures like fuel tanks.
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Fuel tank characteristics
Fuel tanks in gas stations are typically located underground, also known as subway tanks. They are designed to maximise available space, protect against physical damage, and reduce fire hazards. These tanks can be manufactured as single or double-walled structures. Single-walled tanks are more economical but present the risk of fuel leakage if the wall breaks. Double-walled tanks provide greater safety by preventing leaks from reaching the environment. The space between the two walls in double-walled tanks is filled with brine, and any leaks are detected by safety systems.
Fuel tanks are designed to efficiently and safely store liquid fuels such as gasoline and diesel. They are equipped with sensors and alarms to monitor fuel levels and prevent overfilling, reducing the risk of spills. Sensors can also detect leaks, alerting operators to take immediate corrective action. Additionally, tanks have ventilation systems to control the release of vapours and prevent the accumulation of flammable gases, reducing the risk of explosions.
The piping used to connect the tanks to service stations has improved with new materials like fiberglass, which resist corrosion and temperature changes. These pipes do not allow static electricity buildup, reducing the risk of fires. To further prevent leaks, a sand or soil backfill system or synthetic impermeable layers can be used around the tanks.
Fuel tanks can be made from various materials, including metal and plastic. Metal tanks, traditionally made from structural steels, can employ physical and chemical corrosion inhibition techniques. Plastic tanks, made from high-density polyethylene (HDPE), are viable for short-term storage but may become saturated over time as fuels permeate the material.
The construction of fuel tanks involves creating a mockup to determine size and shape, addressing design issues, and selecting materials based on thickness, temper, and alloy. Baffles and ends are added, and openings are created for the filler neck, fuel pickup, and other components. The tanks then undergo leak testing to ensure their integrity.
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Fuel tank maintenance
Fuel tanks in gas stations are typically stored underground. These tanks are designed to hold volatile fuel in the safest possible manner. Fuel tank maintenance is an important aspect of ensuring the safety and efficiency of fuel storage. Here are some detailed instructions for maintaining fuel tanks in gas stations:
Regular Inspections and Checks:
Perform regular inspections and checks to keep fuel in top condition. Monitor for leaks, temperature changes, and other signs of potential issues. Adverse weather conditions, such as heavy rain, strong winds, and extreme temperatures, can impact fuel tanks and cause damage. Regular inspections help identify any weather-related issues and ensure the tank is in good working order.
Proper Storage Techniques:
Use the right containers, temperatures, and additives to improve fuel life. Utilise designated outdoor storage tanks specifically designed to withstand outdoor elements. Avoid repurposing indoor or underground storage tanks for above-ground use, as they may present safety hazards.
Cleaning and Servicing:
Clean fuel storage tanks regularly to remove water, filter the fuel, kill microbes, and get rid of sludge and dead organic matter. The area around the tank should also be cleared of debris, vegetation, and excess moisture to prevent corrosion and identify leaks. While there are varying regulations and recommendations for cleaning schedules, some sources suggest annual cleaning as a best practice.
Safety Measures:
Implement safety measures to prevent fuel spills and leaks. Use double-walled tanks with brine in the hollow area to detect leaks. Install sensors, alarms, and automatic shut-off switches to prevent overfilling. Utilise ventilation systems to control the release of vapors and reduce the risk of explosions. Ensure the piping system is made with materials that resist corrosion and prevent static electricity buildup.
Maintenance of Aboveground Storage Tanks (ASTs):
ASTs are a popular alternative to underground storage tanks due to their ease of maintenance, relocation, and environmental safety. Place ASTs in a safe location, complying with all federal, state, and local regulations. Regularly inspect and maintain ASTs, following guidelines for proper placement, maintenance, cleaning, and servicing.
By following these maintenance procedures, gas stations can ensure the safe and efficient operation of their fuel storage tanks, reducing the risk of accidents and environmental disasters.
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Fuel tank installation
Planning and Preparation:
Firstly, allocate a safe installation space, typically selecting a spot on firm, level ground away from potential health and safety risks, residential or office buildings. It is crucial to refer to local regulations and carry out risk assessments to ensure compliance and identify potential hazards. The ground should be paved or asphalted to aid in pollution prevention. Additionally, ensure the availability of safety response equipment, such as powder, foam, or spill response products, and assess how, when, and by whom the tank will be used.
Installation Process:
The installation process can vary depending on the type of tank being installed, whether it is a single-walled or double-walled tank, and the specific site requirements. For underground tanks, the installation process involves excavating and preparing the site, including the removal of any existing structures. The tanks are then lowered into the ground and connected to the dispensers, piping systems, and safety mechanisms. Modern tanks often have advanced features, such as sensors for fuel level control, ventilation systems to prevent vapour accumulation, and leak detection systems.
For above-ground installations, the process may include preparing the tank pad with framing and a concrete surface. The tanks are then positioned and secured, followed by the installation of the necessary piping, dispensers, and safety equipment.
Testing and Commissioning:
Once the physical installation is complete, the tank must be thoroughly inspected, especially if it is a second-hand tank. After inspection, the tank can be filled with fuel, typically to a maximum of 95% capacity for safety reasons. Ensure that the tank has adequate fuel to prime the pumps and feed lines. Modern dispensers are often pre-programmed to deliver specific quantities of fuel and are equipped with automatic shut-off switches to prevent overfilling.
Maintenance and Upgrades:
Fuel tank maintenance is crucial to ensure the long-term integrity and safety of the system. Regular inspections, cleaning, and testing should be conducted, with particular attention to corrosion inhibition techniques, as corrosion was a common issue with older steel tanks. Modern tanks are often made of fiberglass or coated with durable casings to prevent corrosion. Upgrading to modern, compliant fuel dispensing systems can enhance operational efficiency, safety, and the customer experience.
In summary, fuel tank installation at a gas station involves careful planning, installation of the tank and associated equipment, testing and commissioning, and ongoing maintenance to ensure safety, compliance with regulations, and efficient fuel delivery.
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Frequently asked questions
Fuel tanks in gas stations are typically located underground to reduce the risk of explosions.
Traditionally, fuel tanks were made of structural steels, such as mild steel and stainless steel. However, steel tanks are susceptible to corrosion, so modern tanks are often made of fiberglass or steel with a protective coating.
Gas stations have implemented various measures to prevent fuel spills. These include sensors that detect leaks, automatic shut-off switches that stop fuel from being pumped into the tank before it is full, double-walled tanks that provide an additional layer of protection, and large "buckets" that catch any fuel that spills when the delivery hose is disconnected.
