Code Clarification Question on the water supply duration of 60 mins in NFPA 16 Section 220.127.116.11
Does the 60 min apply only to the hose stream or the entire system ?
Not an engineer or designer
I read entire system.
My guess is the water supply duration is normal as in other sprinkler systems, plus, will also put out or control the fire, even if the system has run out of foam.
6.2.3 Duration. 18.104.22.168* Water supplies shall be designed to meet the fixed fire protection demand plus 250 gpm (946 L/min) for inside and outside hose streams for at least 60 minutes, unless otherwise specified in the occupancy standards.
7.3.3 Discharge Duration. 22.214.171.124 The foam solution shall be designed to discharge for a period of 10 minutes (based on the density as specified in 126.96.36.199) over the entire system area for deluge and spray foam-water systems and over the design area for wet pipe, dry pipe, and preaction foam-water systems. 188.8.131.52 Where actual system discharge exceeds the minimum as specified in 184.108.40.206, a proportionate reduction in the duration of the foam discharge time shall be permitted, but in no case shall the duration be less than 7 minutes.
Thanks for your reply, there was a requirement in NFPA 16 (2007 edition ) for the entire system to be for 60 mins. The foam supply for the load rack sprinkler system is only required for 10 mins, which conflicts with the 60 mins.
I think the 2015 edition clarified the conflict, meaning that the fixed fire suppression system must meet it's requirement (in this case 10 mins), but the water supply for the hose streams must meet the 60 min criteria.
That's my take on it, again thanks Paul for your comments.
Not sure on your reply
i take the sprinklers have to have enough water to flow for 60 minutes, not just the hose
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