the electric furnace shop is Class D plant, and the fire resistance rating of the buildings is designed as Level II. The volume of fire water for workshop is 15L/S, and the number of water cannons simultaneously used is 5; according to a fire at the same time in respect of the fire protection for the plant, the volume of water consumption is 20 L/S, and the duration of a fire accident is 2h; thus, totaling 252m3 of water should be stored in the fresh water tank in the clean circulating water pump station. The fresh water needed to replenish for production and fire protection is supplied by the fresh water pipeline for production in the plant