NFPA 24-2016: 10.10.2.5 Backflow Prevention Assemblies.
10.10.2.5.1 The backflow prevention assembly shall be forward flow tested to ensure proper operation. 10.10.2.5.2 The minimum flow rate tested in 10.10.2.5.1 shall be the system demand, including hose stream demand where applicable. My question is: When is hose stream demand applicable? Is this referring to inside hose streams or all hose streams? Posted anonymously for discussion. Discuss This | Submit Your Question | Subscribe
5 Comments
Jessica
6/20/2019 10:13:15 am
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pjd
6/20/2019 12:15:24 pm
So, if the building is configured with the backflow on the suction side of the pump, and the discharge of the pump feeds a private service main network on which private hydrants are located around the perimeter of the building, the total hose demand should be added. If there are no private hydrants downstream of the backflow preventer, only the inside hose demand is applicable. IHD is found in NFPA 13 §11.1.6.3.
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Frank Herrick
6/20/2019 01:36:58 pm
Depending on the demand (Sizes and number) of hoses.
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Ivonn
6/24/2019 10:35:16 am
NFPA 25 (2002 Edition Section 12.6.2.1, 2008-2014 Section 13.6.2.1, 2017 Section 13.7.2.1) requires annual testing of the backflow preventer at the designated system flow rate, including hose demand, where hydrants or inside hose stations are located downstream of the backflow preventer. Where a means is not provided at maximum demand, test shall be conducted at the maximum flow rate possible (NFPA 25 20002 Edition Section 12.6.2.2.1, 2008-2011 Section 13.6.2.2, 2014 Section 13.6.3, 2017 Section 13.7.2.3).
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