【Daily Question】Utility Engineering – Water Supply and Drainage – 20191228

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An office building in a certain province, with a building height of 47.80 m and a total construction area of 33,510.8 m2. The building is equipped with a fire hydrant system and an automatic sprinkler system for fire suppression. Calculations show that the water consumption of the automatic sprinkler system is 27.5 L/s, and the fire water tank located in the basement is used solely to store water for indoor firefighting purposes. Given that the water replenishment to the fire tank is reliable, with a replenishment rate of 70 m3/h, the effective volume of the fire tank is ( ) m3. A.69.0 B.105.0 C.175.0 D.213.0 Answer: C is the correct answer. In accordance with Article 7.2.2 and Table 7.2.2 of the current Code for Fire Protection Design of High-Rise Civil Buildings, as well as Article 7.3.3 regarding the duration of a fire, the building in question is an important office building with a height not exceeding 50 m. The flow rate required for the indoor fire hydrants is 20 L/s, and the duration of the fire is 2 hours. Therefore, the effective volume of its fire water tank should be: V = 30×3.6×2 + 27.5×3.6×1 – 70×2 = 175 m3.