What Is a Self Bunded Diesel Tank

Introduction

A self bunded diesel tank is a double-walled fuel storage solution designed to store diesel, biodiesel, and other fuels safely while preventing environmental contamination. These tanks are widely used in construction, agriculture, mining, transportation, and standby power generation, offering a cost-effective and compliant way to manage bulk fuel storage.

In this guide, we cover what a self bunded diesel tank is, how it works, its advantages, compliance requirements, and maintenance tips to help you choose the right tank for your operation.

1. What Is a Self Bunded Diesel Tank?

A self bunded diesel tank (also known as a double-walled fuel tank) features two steel walls—an inner tank for fuel storage and an outer containment wall that acts as a spill barrier.

• Primary Tank: Holds diesel fuel.

• Secondary Containment (Bunding): Captures leaks or spills from the primary tank, meeting environmental and safety standards.

This design eliminates the need for a separate bund wall or spill containment pit.

2. Key Features

• Double-Wall Construction: Built-in spill containment

• Fuel Dispensing Equipment: Pumps, meters, hoses, and nozzles

• Access Points: Lockable fill points and manholes for inspection

• Ventilation: Prevents pressure build-up

• Capacity Range: Typically from 500 liters to 110,000 liters

• Portable or Stationary: Forklift pockets or lifting lugs for mobility

3. Advantages of Self Bunded Diesel Tanks

3.1 Environmental Protection

• Meets EPA and SPCC spill prevention regulations

• Prevents soil and groundwater contamination

3.2 Cost Efficiency

• No need for additional bund construction

• Reduces fuel delivery frequency with bulk storage

3.3 Versatility

• Stores diesel, biodiesel blends, lubricants, and waste oil

• Suitable for on-site refueling in remote areas

3.4 Compliance & Safety

• Built to UL 142, UL 2085, or AS 1692 standards

• Fire-rated models available for high-risk environments

4. Applications

• Construction Sites: On-site fuel supply for heavy equipment

• Agriculture: Refueling tractors, harvesters, and irrigation pumps

• Mining: Supplying large machinery in remote locations

• Transport Fleets: Centralized fuel storage for trucks and buses

• Backup Power Systems: Fueling diesel generators for hospitals, data centers, and factories

5. Regulatory Compliance

When installing a self bunded diesel tank, ensure adherence to:

• Environmental Protection Agency (EPA) regulations

• NFPA 30 (Flammable and Combustible Liquids Code)

• UL 142/UL 2085 certification for above-ground tanks

• Australian Standard AS 1940 for fuel storage (if applicable)

• Local fire safety and building codes

6. Installation Best Practices

• Place tank on a stable, level surface

• Maintain safe clearance from ignition sources

• Use approved piping and dispensing systems

• Ensure ventilation to avoid vapor build-up

• Install spill kits and fire extinguishers nearby

7. Maintenance Tips

• Inspect outer bund wall for corrosion or damage

• Check fuel dispensing equipment regularly

• Test fuel quality every 3–6 months to prevent microbial growth

• Keep tank sealed when not in use to avoid water ingress

• Maintain a compliance and inspection log for audits

Conclusion

A self bunded diesel tank offers a reliable, compliant, and cost-effective solution for safe diesel storage. With its integrated spill containment and robust construction, it is ideal for industries that require bulk fuel handling while meeting strict environmental regulations.