One or more fuel oil or diesel oil storage tanks containing a Class II or III combustible liquid shall be permitted in a building. The aggregate capacity of all such tanks shall not exceed 660 gallons (2498 L).
Exception: The aggregate capacity limit shall be permitted to be increased to 3,000 gallons (11 356 L) of a Class II or III liquid for storage in protected above-ground tanks listed in accordance with UL 2085 when all of the following conditions are met:
- The entire 3,000-gallon (11 356 L) quantity shall be stored in protected above-ground tanks listed in accordance with UL 2085;
- The 3,000-gallon (11 356 L) capacity shall be permitted to be stored in a single tank or multiple smaller tanks;
- Normal and emergency venting shall be provided in accordance with NFPA 30 except that the vent capacity reduction factors shall not be allowed;
- Flame arrestors or pressure vacuum breather valves shall be installed in normal vents;
- Secondary containment, drainage control or diking shall be provided in accordance with Section 2704.2 of the fire code;
- An overfill prevention system that prevents the tank from being filled in excess of 95 percent of its capacity shall be provided for each tank. Filling procedure information shall be available and accessible to the person filling the tanks;
- The fill pipe shall be provided with a means for making a direct connection to the fuel delivery hose so that the delivery of fuel is not exposed to the open air during the filling operation;
- A noncombustible fixed spill container having a capacity of not less than 5 gallons (19 L) shall be provided for each fill connection. The spill container shall be equipped with a manual drain valve that drains into the primary tank;
- Approved anti-siphon devices shall be installed in each external pipe connected to the protected above-ground tank when the pipe extends below the level of the top of the tank; and
- The tanks shall be located in a room protected by an automatic sprinkler system complying with Section 903.3.1.1 of the building code.
Exception: Protected above-ground tanks listed in accordance with UL 2085 and complying with Section 1308.3.1 shall not be required to be separated from surrounding areas.