UL 2085 Tank [1]

An aboveground, shop fabricated, secondarily contained vessel designed to store flammable and combustible liquids constructed according to Underwriters Laboratories [2] Standard 2085 entitled Protected Aboveground Tanks for Flammable and Combustible Liquids. 

A UL 2085 tank is intended to limit the heat transferred to the primary tank during a fire and to protect the tank from physical damage. 

See also PEI/RP600 [3], UL 80 tank [4] and UL 142 tank [5].