STI F921® aboveground storage tanks are manufactured with a double‐wall steel design. Standard features include built‐in, testable, interstitial monitoring capability and impermeable secondary containment. STI F921® Tanks deliver uncompromising performance, reliability, service and economy.

Compatible With a Wide Range of Fuels and Chemicals, Including Biodiesel and Ethanol.

STI F921® tanks come with a 30-year warranty.

STI F921® Tanks Product Details

  • Meets UL-142, Standard for Steel Aboveground Tanks for Flammable and Combustible Liquids.
  • Double-wall design offers integral, impermeable secondary containment to meet EPA SPCC requirements
  • Primary and secondary tank can be tightness tested on site with standard testing procedures.
  • Interstitial space can be monitored for leak detection.
  • Primary storage tank and secondary containment are compatible with a wide range of fuels and chemicals.
Additional Features:
  • Support designs available for all seismic requirements
  • Choose from many integral support types, including saddles and skids
  • Vertical tanks supported on legs, and skirted available, with Listing label
  • Capacities range up to 75,000 gallons
  • Steel construction allows for recycling
  • Low cost compartments and customization
  • Built to nationally-recognized STI standards with strict third-party QC inspection program
  • Available only from STI members
STI F921® Tanks

* Custom Sizes Available
**LP – indicates “Low Profile”
*** Custom Coatings Available

Available Designs:
  • Rectangular
  • Horizontal
  • Vertical

F921® Guideline Specifications:

A. General:
  1. Provide F921® double-wall steel aboveground storage tanks.
B. Labeling:
  1. Tanks shall bear the Steel Tank Institute F921® Double-Wall Aboveground Storage Tank identification label.
C. Product Description:
  1. Tanks shall be manufactured in accordance with Steel Tank Institute F921®, Standard for Double-Wall Aboveground Storage Tanks.
  2. Aboveground tank primary and secondary containment (inner and outer walls) shall be manufactured in accordance and listed with Underwriters Laboratories UL-142, Standard for Steel Aboveground Tanks for Flammable and Combustible Liquids.
  3. Tanks shall be double-wall with a steel inner wall for primary containment and provide integral secondary containment by an impervious steel outer wall.
  4. Integral secondary containment shall be testable and provide access for interstitial leak detection monitoring.
  5. Listed supports shall be used for all horizontal, rectangular and vertical double-wall tanks. Supports are designed for seismic loading, if necessary.
D. Manufacturer:
  1. Manufacturer shall be a licensed member company of the Steel Tank Institute and subject to Steel Tank Institute’s Quality Assurance program.
Ladders, Stairs, Platforms, Catwalks:

Internal and external ladders, stairs, platforms and catwalks are designed to comply with strict OSHA guidelines.

Greer Diked Fuel Tank with Custom Ladder and Catwalk
Tank Supports:

Greer’s tank supports are designed to keep the tank stationary and also to support and elevate the tank to minimize corrosion concerns. Our supports are available in different designs to accommodate specific installation requirements: UL saddles, skids, cradles or a variety of tank stands.

Fuel Tank on Skid Supports
Custom Manways:

Manways provide access to the tank and include a bolted cover and gasket. A variety of designs can be ordered for your specific project.

Fuel Tank with a Custom Manway
Complete Pump Systems:

Your pump systems packages can be ordered to your specific needs. These can either be mounted on the tank, on a platform, or shipped loose for installation by others.

Pump System on a Steel Fuel Tank
Fuel Guards and Spill Containments:

Our Fuel Guards are powder coated (inside and out) and are available in 5 or 7.5 gallon sizes. The tops are designed so that they may be locked. Spill containments are designed per project spec. and contains 1/2” plunger to return spilled liquids.

Custom Fuel Guards for a Steel Fuel Tank
Alarm Gauges:

These provide detection for leak and level alarms.

Custom fitted gauge on a Greer Fuel Tank

STI F921® Above Ground Tanks

STI/SPFA – F921® Product Sheet

~ PDF (112KB)