Above Ground Tanks

Fireguard UL 2085

STI Fireguard® Tank by Southern Tank is UL 2085 certified, offering both fire-protected and fire-resistant secondary containment for aboveground storage. Its innovative design features lightweight thermal insulation that not only exceeds the UL 2-hour fire test but is also securely enclosed between two layers of steel. This double-wall steel construction ensures UL-listed secondary containment.

What sets the Fireguard® Tank apart is its interstitial insulation—75% lighter than concrete—dramatically reducing overall tank weight. That means lower costs for shipping, easier installation, and more flexibility when relocation is needed, all without compromising safety or performance.

Each one of Southern’s Fireguard® Tanks is built to nationally recognized UL and STI standards and is subject to strict quality control inspections. Every Fireguard®’s primary (inner) and secondary (outer containment) tank is tested for leaks per UL 142 procedures in our manufacturing facility and may be tightness tested on site using standard testing methods.

Here are some of the codes and standards that the Southern Fireguard® Tank complies with:

  • UL 142 primary and secondary tanks
  • UL 2085 Listed “Protected” tank
  • Uniform Fire Code UFC-Article 79 as a “Protected Tank”
  • National Fire Protection Association (NFPA) 30, 30A, & 31
  • International Fire Code (IFC) 2000-Chapter 34
  • Ballistics protection per UFC Article 79 and per UL 2085
  • Impact protection per UFC Article 79 and per UL 2085
  • Uniform Fire Code (UFC) Standard A-II-F-1
  • California Air Resources Board (CARB) testing requirements for air emissions
  • Steel Tank Institute (STI) Standard F941 for Thermally Insulated Above Ground Storage

Durability Meets Efficiency – The Fireguard® tank’s steel outer wall offers exceptional resistance to extreme weathering while keeping maintenance costs low. Each tank is finished with a durable polyurethane coating applied over an SP-6 sandblasted surface, ensuring long-term protection and performance. Unlike concrete, the steel construction eliminates concerns about spalling or cracking.

Advanced Thermal Protection & Leak Detection – Inside, the interstitial porous insulation safeguards stored contents from both ambient and extreme temperatures. This material also enables any potential leak to migrate to a designated monitoring point, allowing for quick and easy detection. For added safety, the design prohibits any below-liquid primary openings.

Designed for You, Built for Safety – Southern Tank’s Fireguard® Tank can be cylindrical or rectangular in shape, and is available in sizes ranging from 186 to 12,000 gallons. Openings, manways, platforms, ladders, stairs, catwalks, exterior coatings, interior linings, compartmentalization, and other custom requirements can be incorporated to fit your specific needs.

Contact us today to tell us about your project, or request a quote to your specifications.