Modern’s Glasteel “Composite” Underground Storage

  • 300 to 60,000 gallon capacity
  • Material of construction; carbon steel
  • Underwriters Laboratories Construction, UL-58, UL-1746 Part II
  • Steel Tank Institute ACT-100 construction compliance
  • Single or double wall steel configurations available
  • Available with multiple compartments for multiple fuel storage
  • Compatible with gasoline, diesel, fuel oil, ethanol, methanol and additives
  • Can be lined internally for special applications, such as jet fuel or potable water storage
  • Installation friendly and lower installation cost


Glasteel™: “Composite underground storage tank - A steel primary tank with a nonmetallic external cladding or laminate constructed of fiberglass and polyester or urethane resin.” These are atmospheric steel tanks intended for storage underground of flammable and combustible liquids. Threaded fittings / openings can be located along the tank’s top centerline or openings can be installed inside containment sumps. Glasteel tanks may be single or double wall construction, with or without multiple compartments for multiple fuel storage. If the tank is a double wall configuration, then it has interstitial monitoring capabilities. Glasteel tanks are built to Underwriters Laboratories UL-58, UL-1746 and Steel Tank Institute’s ACT-100 specifications.


Drawings: Single Wall, DW Type I
Drawings: Single Wall, DW Type I,

Illustration: Single Wall, DW Type I, DW Type II

Spec Data: Single Wall, DW Type I

UL Certificate of Compliance: Single Wall, Double Wall

STI Installation Instructions

Brochure: Glasteel