SF Underground Double-walled Fuel Tanks

For facilities where fuel storage must operate safely below ground without compromising environmental protection, our double-wall underground tanks offer a practical, long-term solution. Each system is built to handle the demands of industrial, commercial, and municipal sites, combining durable materials with continuous leak monitoring to help operators stay ahead of potential risks.

Over the years, we've supplied these tanks to fuel stations, transport hubs, and manufacturing plants across varied soil and climate conditions-from coastal areas with high groundwater to inland sites with corrosive soils. That field experience shapes every aspect of the design.

Inside the tank, a carbon steel primary chamber-fabricated to ASTM A36 standards and protected with a multi-layer epoxy coating-stores fuel securely. Around it, a seamless fiberglass-reinforced plastic (FRP) shell acts as a second line of defense, resisting moisture, chemicals, and microbial attack.

Between these walls lies a fully monitored interstitial space. If hydrocarbons enter this zone, sensors calibrated to detect releases as small as 0.1 gallons per hour (0.38 L/h) send an immediate alert. In practical terms, that means maintenance teams can investigate and resolve issues long before they become environmental incidents.

We design every unit to align with UL 1316, STI F961, NFPA 30, and EN 976 requirements. For project managers, that alignment often shortens the permitting process and removes uncertainty during inspections. Whether your site is in North America, Europe, or elsewhere, the system arrives ready to meet local authority expectations.

Tank capacities range from 20 to 100 cubic meters (5,300–26,400 US gallons), and we can adjust specifications to suit soil type, groundwater depth, and fuel compatibility needs. Our engineering team has worked with diesel, gasoline, biodiesel, and ethanol blends, ensuring material selection matches the fuels you store.

Typical operating temperatures span -30°C to +50°C (-22°F to 122°F), covering most climates without special modification. With correct installation, the structure is expected to perform reliably for over 30 years.

• Early warning, not after-the-fact response:​ Continuous interstitial monitoring pinpoints leaks quickly, reducing cleanup costs and downtime.
• Materials chosen for the ground they're buried in:​ The FRP outer shell resists corrosion far better than bare steel, especially in aggressive soils.
• Smoother approvals:​ Pre-aligned with major codes, the design helps projects pass plan review and inspection stages faster.
• Adaptable sizing:​ We've delivered compact units for small fleets and large-capacity tanks for high-volume fueling operations.
• Proven in the field:​ Feedback from installers and end users confirms consistent performance across diverse sites.

You'll find them in fuel retail sites, fleet depots, factory backup power setups, aviation and marine fueling stations, and renewable energy projects. Any operation that stores petroleum products underground-and wants to minimize environmental liability-can benefit from this approach.

Before leaving our factory, each tank goes through pressure testing, sensor calibration, and coating inspection. We provide the relevant certification documents for your region, along with a warranty that reflects our confidence in the build quality.

Our installation partners report that the precision filament winding process results in a smooth, uniform outer shell, which speeds up placement and backfill on site.

If you're planning a new fuel storage installation or upgrading an existing system, we can help you select the right capacity, materials, and monitoring options. Contact us for a tailored proposal, complete with technical drawings and recommendations based on your site's soil, climate, and regulatory requirements.

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