S/F Double-Wall Underground Fuel Storage Tank

The S/F Double-Wall Underground Storage Tank is a high-tech pressure vessel designed for the secure storage of flammable and hazardous liquids. By combining the structural strength of a high-grade steel inner tank with the superior corrosion resistance of a fiberglass-reinforced plastic (FRP) outer shell, this tank provides a “double-safe” containment system. It is specifically engineered…

Complies with international standards

Seaworthy reinforcement & anti-corrosion treatment

Third-party inspection supported

Lead time: 15-30 days

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Product Structure

Primary Steel Tank (Inner): Fabricated from high-tensile carbon steel to provide the primary structural containment and pressure resistance.
FRP Outer Shell (Secondary): A seamless fiberglass-reinforced plastic layer that provides total protection against external soil corrosion.
Interstitial Leak Detection Space: A constant 0.1mm–3.5mm gap between the two walls connected to a 24-hour vacuum or liquid monitoring system.
Internal Anti-Corrosion Lining: Specialized internal coatings (e.g., epoxy) tailored to the specific chemical properties of the stored fluid.
Top Manway & Nozzles: Reinforced access ports for fuel filling, venting, suction, and electronic level sensing.
Lifting Eyelets: Integrated heavy-duty lugs for balanced hoisting and precise positioning during burial.

Product Advantages

Leak Prevention & Environmental Safety: The dual-layer design ensures that even if the inner tank fails, the outer shell contains the fluid, while the monitoring system triggers an immediate alarm.
Superior Corrosion Resistance: The FRP outer layer is immune to electrochemical corrosion, eliminating the need for expensive cathodic protection systems.
Extreme Durability: Designed for a service life of over 30–50 years, significantly outlasting traditional single-wall steel tanks.
Economic Installation: Lightweight compared to full-steel double-wall tanks and requires less civil engineering than building concrete containment dikes.
Standard Compliance: Manufactured in strict accordance with international environmental safety standards for underground storage.

Material & Specifications

Feature	Specification
Inner Layer Material	Q235B Carbon Steel (6mm – 10mm thickness)
Outer Layer Material	Fiberglass Reinforced Plastic (FRP) ≥ 4mm
Interstitial Space	Vacuum-monitored or Liquid-filled gap
Capacity Options	5m³ to 100m³ (Customizable diameters)
Standard Finish	Smooth FRP finish with high-visibility safety markings

Technical Parameters

Working Temperature Range: -20°C to +50°C.
Design Pressure: Atmospheric pressure (Underground vacuum-rated).
Leak Detection Sensitivity: Detects leaks as small as 0.1L/hour through pressure/vacuum variance.

Application Scenarios

Commercial Gas Stations: The industry standard for underground petrol and diesel storage.
Industrial Chemical Plants: Safe containment of acids, solvents, and other hazardous chemical feedstocks.
Airport & Marine Refueling: Reliable underground fuel reserves for aviation and maritime logistics.
Emergency Power Systems: Bulk fuel storage for backup generators in hospitals, data centers, and government facilities.
Wastewater Management: Containment of industrial runoff or contaminated process water prior to treatment.