Sylvie Willis
Above-ground fuel tanks are typically used to store fuel for specific fleets, such as municipal or police vehicles, and range in capacity from 250 gallons to 40,000 gallons. They are generally easier to monitor for leaks and less costly to install compared to underground storage tanks. When considering a 30,000-gallon above-ground fuel tank, factors such as maintenance, relocation, and inspection requirements come into play. Proper maintenance includes ensuring drainage of surface water and regularly checking for and removing any water from the primary tank to prevent corrosion and plugging of filters. Relocation procedures involve meticulous documentation, and inspections should focus on the tank foundation, connections, coatings, walls, and piping system.
| Characteristics | Values |
|---|---|
| Capacity | 30,000 gallons |
| Shape | Cylindrical |
| Mounting Options | Vertical or horizontal |
| Material | Steel with a single or double wall |
| Coating | Industrial quality, suitable for use with the current coating |
| Maintenance | Monthly inspections for water at the lowest points inside the tank |
| Relocation | All steps must be documented and kept for the life of the tank |
| Inspection | Focus on tank foundation, connections, coatings, tank walls, piping system, and accessories |
| Leak Detection | Inventory tracking and external inspections when the tank is in use and out of service |
| Warranty | 30-year tank warranty backed by the Steel Tank Institute |
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What You'll Learn
- Inspection requirements: focus on foundation, connections, coatings, walls, piping, valves, and sensors
- Maintenance: ensure proper drainage and prevent standing water near or under the tank
- Tank types: ASTs are cheaper and easier to install and monitor than USTs
- Tank shapes: ASTs can be square, rectangular, or cylindrical; USTs are typically cylindrical
- Tank mounting: horizontal ASTs can be placed on steel saddles, a skate, or concrete dikes
Inspection requirements: focus on foundation, connections, coatings, walls, piping, valves, and sensors
Regular inspections are essential for maintaining above-ground fuel tanks. The foundation, connections, coatings, walls, piping, valves, and sensors of the tank should be inspected regularly to ensure the tank is in good working condition and to prevent leaks, corrosion, and other damage.
Foundation
The foundation of the tank should be stable and level. An unstable foundation can cause the tank to collapse or rupture. Regular inspections of the foundation can help identify any issues early on and prevent potential disasters.
Connections
Connections, including piping and fittings, should be inspected for leaks or damage. They should also be checked to ensure they are properly secured and in good working condition. This includes checking for any signs of corrosion or rust, which can weaken the connections over time.
Coatings
The application of protective coatings can significantly increase the lifespan of above-ground fuel tanks. Coatings prevent corrosion, which can lead to ruptures, collapses, and spills. The American Petroleum Institute (API) recommends that tanks be inspected every three years. However, tank owners may extend the inspection cycle to up to ten years by following reliability-centered maintenance methods.
Walls
The exterior and interior walls of the tank should be inspected for any signs of damage, such as dents, rust, or corrosion. Single-wall tanks are more susceptible to corrosion and leaks, so double-walled tanks are preferable. The outer wall protects the inner tank from the elements and contains the fuel in case of a leak.
Piping, Valves, and Sensors
Piping should be inspected for leaks, corrosion, or blockages. Valves should be checked to ensure they are functioning properly and securely closed when necessary. Sensors, such as leak detectors, should also be inspected to ensure they are in working order and will activate in the event of a leak.
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Maintenance: ensure proper drainage and prevent standing water near or under the tank
Maintaining proper drainage and preventing standing water near or under a 30,000-gallon above-ground fuel tank is crucial for several reasons. Firstly, standing water can lead to corrosion and tank damage, increasing the risk of leaks and fuel contamination. Secondly, water entering the tank can cause bacterial growth, which in turn can corrode the tank and lines. Here are some detailed instructions to ensure proper drainage and prevent water accumulation:
Site Preparation and Maintenance:
Proper site preparation is vital to ensure effective drainage of surface water. When setting up the tank, ensure the ground is level and compacted to prevent water pooling. If ground conditions change or settlement occurs over time, take appropriate measures to maintain proper drainage. This may include regular inspections and maintenance to identify and address any drainage issues.
Tank Inspections:
Conduct regular inspections of the tank and its surroundings to identify any areas of standing water or moisture accumulation. Develop a monthly inspection schedule, considering the age and condition of the tank, service history, past inspection results, and the physical environment. Older tanks or those in humid or saltwater environments may require more frequent checks. During inspections, look for signs of water intrusion, such as condensation, leaks, or standing water near the tank or its foundation.
Water Removal and Prevention:
If water is found inside the tank, remove it promptly. Additives can be used for small amounts of water, but for larger quantities, drain the entire tank and clean the inside, removing any corrosion, rust, or debris. Ensure that the coating selected for the tank is suitable for the existing coating or remove the old coating before applying a new one. The coating should be of industrial quality and compatible with the fuel type.
Spill and Leak Prevention:
Prevent fuel spills and leaks by following proper procedures. For diked tanks, immediately remove any product spills and dispose of hazardous materials properly. Ensure that drain openings are maintained liquid-tight to prevent water intrusion. Regularly inspect containment devices, such as dikes or concrete containment areas, for cracks, punctures, or leaks, and implement procedures for the regular removal of rainwater.
Staff Training:
Ensure all staff members are trained on tank-related safety measures, including proper inspections, spill containment, and safe cleanup procedures. Educate staff about the importance of keeping the area around the tank clear of standing water and the potential risks associated with water intrusion.
By following these maintenance procedures, you can help ensure proper drainage and prevent standing water near or under your 30,000-gallon above-ground fuel tank, thus reducing the risks of corrosion, contamination, and fuel leaks.
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Tank types: ASTs are cheaper and easier to install and monitor than USTs
Above-ground storage tanks (ASTs) are cheaper and easier to install than underground storage tanks (USTs) for several reasons. Firstly, USTs require careful excavations and subsequent back-filling during installation, whereas ASTs can be easily set up on a concrete base. USTs must also comply with stringent codes and regulations to prevent leaks and accidents, and special equipment is needed to monitor their conditions periodically. In contrast, ASTs are guided by less harsh regulations and are easier to monitor for leaks as these can be seen without the use of expensive equipment.
ASTs also offer more flexibility in terms of system footprint and accessibility. They can be mounted vertically or horizontally and come in various shapes, including square, rectangular, and cylindrical. This versatility allows for different mounting options, such as on steel saddles, skates, or concrete dikes. On the other hand, UST systems offer greater space efficiency and accessibility, with the final installation typically limited to fuel access islands.
The desired capacity of the tank is another important consideration. Most codes limit the AST size, particularly for fuelling applications, and the size and configuration of an AST will influence filling procedures. The tank's shape will also impact the decision, as cylindrical tanks may have a smaller footprint than rectangular tanks.
Finally, ASTs have lower building costs due to their smaller storage volume requirements. Commercial ASTs, for example, are designed to store limited fuels for specific fleets, taking up less room on-site. USTs, on the other hand, can range in capacity from 8,000 to 30,000 gallons, requiring more significant space and financial investments.
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Tank shapes: ASTs can be square, rectangular, or cylindrical; USTs are typically cylindrical
When it comes to above-ground fuel tanks, there are two main types: ASTs (Aboveground Storage Tanks) and USTs (Underground Storage Tanks). The difference between the two lies primarily in their placement, with USTs being buried underground and ASTs residing above the ground surface.
Now, regarding tank shapes, ASTs offer a lot of versatility. They can be square, rectangular, or cylindrical. This flexibility in shape allows ASTs to be mounted vertically or horizontally, depending on the available space and specific requirements. Horizontal ASTs, for example, are often chosen when space is limited as they provide a more efficient use of space and can be easily transported. On the other hand, USTs typically come in the familiar cylindrical shape with capacities ranging from 8,000 to 30,000 gallons.
The shape of ASTs, whether square, rectangular, or cylindrical, provides advantages in terms of visibility and accessibility. Their above-ground placement makes it easier to monitor for leaks compared to USTs. This accessibility also makes ASTs more straightforward to set up and maintain. They can be installed on concrete bases quickly and are governed by regulations that are generally less stringent than those for USTs.
In contrast, the cylindrical shape of USTs serves a different set of purposes. USTs are often used when space is constrained, and their underground installation requires careful excavations. To prevent leaks and accidents, USTs must adhere to stringent codes and are monitored periodically with special equipment.
While the shape and placement of these tanks differ, both ASTs and USTs are designed to securely store liquids such as water, petroleum, chemicals, or hazardous materials. Each type of tank has unique applications and considerations, catering to specific storage needs and spatial constraints.
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Tank mounting: horizontal ASTs can be placed on steel saddles, a skate, or concrete dikes
Above-ground storage tanks (ASTs) can be mounted in a variety of ways, depending on their shape and size. Horizontal ASTs, which can be cylindrical, square, or rectangular, are typically placed on two steel saddles, a skate, or concrete dikes.
Steel saddles provide a stable base for horizontal ASTs and help distribute the weight of the tank evenly. They are designed to match the curvature of the tank and are often used in pairs to provide additional support. Steel saddles are a common choice for mounting horizontal ASTs as they are sturdy and can handle the weight of the tank and its contents.
Skates, on the other hand, are designed for mobility. Horizontal ASTs can be mounted on a skate to be easily moved around from one location to another. This mounting option is ideal for temporary installations or when the tank needs to be relocated frequently. Skates typically have wheels or rollers that allow for easy movement and positioning of the tank.
Concrete dikes, also known as concrete pads, provide a solid and level surface for horizontal ASTs. These dikes are usually constructed with reinforced concrete to ensure they can withstand the weight of the tank. Concrete dikes often have a raised perimeter to contain any potential spills or leaks from the tank. This mounting option is commonly used for permanent installations where stability and spill containment are crucial.
The choice between steel saddles, skates, or concrete dikes depends on the specific requirements of the installation. Steel saddles offer stability, skates provide mobility, and concrete dikes ensure a robust and permanent solution with spill containment capabilities. It is important to consider the intended use, location, and regulatory requirements when deciding on the appropriate mounting option for horizontal ASTs.
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Frequently asked questions
Aboveground fuel tanks can be made out of steel with single or double walls and are often coated to prevent corrosion. They can be installed on a concrete base and are relatively easy to set up.
It is important to conduct regular internal and external inspections of the tank when it is both in and out of use. The primary tank should be inspected monthly for the presence of water, which should be removed to prevent plugging of filters.
Safety considerations should be established prior to undertaking any physical activities associated with the tank, and cleaning should be done according to state and local jurisdiction requirements.
Aboveground storage tanks (ASTs) are easier to monitor for leaks and have less stringent construction regulations compared to USTs. They also have lower building costs and take up less space on-site.
A 30,000-gallon aboveground fuel tank can be made with a steel outer wall for protection and low-cost maintenance. It may also feature a primary and secondary tank that is compatible with a wide range of fuels and chemicals.
