This is the section I was waiting to hear someone identify. I
personally say you don't need to open 6 hydrants to get a 25% drop
provided you meet or exceed the system demand.
A 31 gpm difference is insignificant but unless you hit the magical
25%, you have to go with the demands of the AHJ. Suggesting an
outside source for education is warranted. Any bets that such a
suggestion would be well received?
Roland
On Jul 31, 2008, at 12:38 PM, John Drucker wrote:
Eric,
Good point. In order to be accurate sufficient water must be flowed to
attain a 25% drop in pressure. (NFPA 291-4.3.6)
As a plan reviewer I've seen plenty of flat tests and back they go.
Wheres that stick.
John Drucker
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