Underground FF Double-walled Tank

The Definitive Answer for Challenging Burial Sites
When burial conditions are extreme-high water tables, aggressive soils, or contaminated sites-the Underground FF Double-Walled Tank provides unparalleled security. This tank is over-engineered for subsurface duty, featuring a secondary containment shell with significantly increased wall thickness and hoop strength, specifically calculated to withstand the permanent hydrostatic and earth loads of complete burial. Its monolithic, non-corrosive FRP construction is fundamentally impervious to the electrochemical and microbial attacks that degrade steel tanks, offering a permanent solution where traditional options have a finite service life.
The design prioritizes long-term monitoring and serviceability. The interstitial space is accessed via a dedicated, watertight monitoring well that extends to grade, allowing for sensor servicing or manual testing without excavation. The tank can be equipped with a nitrogen inerting system for the annulus, providing an extra layer of safety for volatile fuels and enhancing leak detection sensitivity.

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Technical Superiority for Subsurface

• Burial-Specific Engineering: Wall thickness and resin formulation are customized based on site-specific geotechnical reports, considering soil corrosivity, water table height, and backfill material.

• Superior Load Handling: Designed to resist long-term soil settlement, frost heave forces, and potential surface traffic loads, ensuring dimensional stability over decades.

• Advanced Leak Detection: Supports multiple independent monitoring methods (vacuum, pressure, liquid sensing) within the annulus, providing fail-safe detection even in fully flooded conditions.

Unrivaled Benefits for Difficult Sites

• Eternal Corrosion Resistance: Eliminates the lifecycle cost and risk associated with steel tank cathodic protection system installation, monitoring, and replacement.

• Solves Water Table Problems: Can be installed successfully in areas with permanent or seasonal high groundwater, a scenario that complicates or precludes steel tank use.

• Ideal for Brownfield Sites: Its inert construction is unaffected by residual soil contaminants, making it the premier choice for redevelopment projects on former industrial land.

• Regulatory Peace of Mind: Often exceeds the strictest local environmental regulations for underground storage, facilitating project approval and reducing long-term liability.

Ideal Applications: Critical for fuel storage at coastal facilities, sites with acidic or saline soils, former gas stations being remediated and upgraded, and any location where a leak would be catastrophic or remediation prohibitively expensive.

Comprehensive Project Support: Our process includes a mandatory site evaluation. We then provide a burial suitability report and tank specification. Delivery includes custom-engineered lifting equipment for safe placement in the excavation. Post-installation, we offer a baseline integrity test and long-term data monitoring services.

FAQ

Q: How is it anchored to prevent flotation in high groundwater?

A: We provide site-specific anchorage designs, which may include a reinforced concrete slab anchor or dead-man anchors, calculated based on the buoyant forces from your specific water table data.

Q: Can it be installed under a building or heavy paving?

A: Yes, with proper engineering. We design for specific live and dead loads, allowing for installation under driveways, parking lots, or even building foundations when necessary.

For subsurface storage where failure is not an option, the Underground FF Double-Walled Tank delivers permanent, maintenance-free security.

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