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# FLOW RATE FOR COMBINED SYSTEM

Question asked by eng_m_m.abd89@yahoo.com on Aug 27, 2019
Latest reply on Sep 1, 2019 by sahawnehmajdi

Hello, I have one high rise building covered with a combined system but partially sprinkler (ordinary hazard G 01).

01- there are more than five risers.

02- as per standpipe calculations, system needs need 1250 GPM. for sprinklers around 350 GPM.

As per NFPA 14 2016.

(7.10.1.1.4) Flow rates for combined systems shall be in accordance with 7.10.1.3.

7.10.1.1.5 The maximum flow rate shall be 1000 GPM(3785 L/min) for buildings that are sprinkled throughout, in accordance with NFPA 13, and 1250 GPM (4731 L/min) for buildings that are not sprinkled throughout, in accordance with NFPA 13.

7.10.1.3.2 For a combined system in a building equipped with partial automatic sprinkler protection, the flow rate required by 7.10.1 shall be increased by an amount equal to the hydraulically calculated sprinkler demand or 150 GPM (568 L/min) for light hazard occupancies, or by 500 GPM (1893 L/min) for ordinary hazard occupancies, whichever is less.

My question is according to my case what the flow rate should be

A- 1250 GPM which is the max flow as per (7.10.1.1.5).

B- 1250 GPM + 350 gpm = 1600 GPM as per (7.10.1.3.2 ).

Please clarify, Thanks