5704.2.10.2 Diked areas containing multiple tanks.

Diked areas containing multiple tanks shall be subdivided in accordance with NFPA 30.

5704.2.10.3 Protection of piping from exposure fires.

Piping shall not pass through adjacent diked areas or impounding basins, unless provided with a sealed sleeve or otherwise protected from exposure to fire.

5704.2.10.4 Combustible materials in diked areas.

Diked areas shall be kept free from combustible materials, drums and barrels.

5704.2.10.5 Equipment, controls and piping in diked areas.

Pumps, manifolds and fire protection equipment or controls shall not be located within diked areas or drainage basins or in a location where such equipment and controls would be endangered by fire in the diked area or drainage basin. Aboveground piping shall be minimized and located as close as practical to the shell of the tank in diked areas or drainage basins.

   Exceptions:

      1.   Pumps, manifolds and piping integral to the tanks or equipment being served which is protected by intermediate diking, berms, drainage or fire protection, such as water spray, monitors or resistive coating.

      2.   Fire protection equipment or controls which are appurtenances to the tanks or equipment being protected, such as foam chambers or foam piping and water or foam monitors and hydrants, or hand and wheeled extinguishers.

5704.2.10.6 Dike construction.

All dike walls shall be of steel or reinforced concrete, designed to be liquid-tight and to withstand a full hydraulic head, and constructed to provide access to and from the diked area. Where stairways or other means are required to provide such access, they shall be constructed of steel. No dike wall shall be higher than 60 percent of the tank height.

5704.2.11 Underground tanks.

Underground storage of flammable and combustible liquids in tanks shall comply with the requirements of FC 5704.2, and 5704.2.11.1 through 5704.2.11.5.2.