Tanks are the primary components of the UST system, and are used for the storage of liquids such as CERCLA-classified hazardous chemicals, used / waste oil, and fuel for emergency generators.


They come in many different sizes and configurations, and vary in diameter from a few feet to ten or twelve feet.   The maximum capacity of shop-fabricated tanks is approximately 50,000 gallons.


Tank are constructed from steel, fiberglass-reinforced plastic (FRP), and composites (e.g. steel and FRP), in both single- and double-wall, compartmented and single- compartment configurations.   Some tank types include,

•    ACT-100 (composite of steel and FRP cladding)

•    Permatank (composite steel with FRP jacket and vacuum interstitial)

•    Sti-P3 (three-way cathodically-protected UL58)

•    FRP (Single-wall)

•    FRP (Double-wall with brine monitoring fluid or dry interstitial sensor)


Tanks must be constructed from materials that are compatible with the substance to be stored in the tank.   Consult with the manufacturer of the tanks installed at your UST facility for more information about the compatibility of materials from which that tank was constructed and the product stored in the tanks.  


The manufacturer can also provide warranty information about the tanks.  


Tanks must be UL rated®, and have a COMM 10 Material Approval for use with USTs installed in the State of Wisconsin.