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Underground Steel Storage Tank

ACT-100® steel/FRP composite tank features a strong steel tank for structural integrity, and a 100‐mil fiberglass outer coating for long‐lasting corrosion protection. Double‐wall design allows continuous interstitial leak detection and monitoring.

ACT-100® Features

  • Meets UL 58 and UL 1746
  • A high‐voltage holiday test of the coating assures that the steel is isolated from corrosive soils
  • Can be used with a variety of leak detection systems
  • Steel provides complete compatibility with all blends of ethanol and biodiesel fuels
  • Impermeable to all petroleum products and vapors
  • No failures due to external corrosion in its history
  • Flat end design reduces the cost of installation and increases site layout flexibility
  • Steel tank provides structural strength, while its outer coating of fiberglass prevents corrosion
  • Various backfill options allow for money‐saving installation
  • Capacities range up to 60,000 gallons
  • Single or double‐wall construction

ACT-100® Benefits

  • Steel construction allows for recycling
  • Low cost compartments and customization
  • Built to nationally‐recognized STI standards with strict third‐party quality control inspection program

ACT-100® is available from an extensive group of Steel Tank Institute fabricators who participate in the STI Quality Control Program. Under the program, independent quality control inspectors make unannounced visits to STI members, ensuring fabrication to the highest possible standards.


  • ACT-100
  • Tank Technologies
  • Underground