(Amended by Ord. No. 187,719, Eff. 1/23/23.)
Chapter 35 of the 2022 California Building Code to the extent it adopts and amends NFPA 22 is adopted by reference.
1. One or more water tanks shall be installed to serve the fire sprinklers and standpipes in a high-rise building. No tanks shall serve more than one building, however, one water service may supply tanks for more than one building, structure or tower.
2. The tank shall be supplied from the City water main via an automatic fill line. The auto-fill system shall be sized to replenish the water in the tank at a rate equal to, or greater than, the required fire pump capacity. The auto-fill lines shall be a minimum of two inches in diameter and shall not exceed a maximum of four inlets into the tank. The auto-fill system bypass shall be provided around all fill lines with a shut off valve that is normally closed. Means shall be provided to flow test the automatic fill valves individually and collectively. A minimum 2 inches tank auxiliary drain valve shall be required for all water storage tanks to accommodate testing.
3. The capacity of the tank shall be based on the required standpipe demand capacity for the duration as specified in Table 19.2.3.1.2 of NFPA 13 or the requirements in Section 403.3.3 of the 2022 California Building Code, whichever is greater.