Flammable or combustible liquids must be stored in tanks or closed containers. But how much flammable liquid can be outside of a flammable cabinet or storage room at any time?
The quantity of liquid that may be located outside of an inside storage room or storage cabinet in a building or in any one fire area of a building shall not exceed:
25 gallons of Class IA liquids in containers
120 gallons of Class IB, IC, II, or III liquids in containers
660 gallons of Class 1B, 1C, II, or III liquids in a single portable tank.
Source: 1910.106(e)(2)(ii)(b)