Right, but what he's talking about here is one giant horizontal standpipe. NFPA 14 (contrary to what many assume) does not require that you take 500 GPM from the most remote outlet - you take 250 from each of the most remote and start with that on the "most remote" standpipe. So if you view the entire building as a big horizontal standpipe system (and it's conceivable that there could be numerous variations on the theme of how to pipe it), then it may still come down to 250+250+250+250+++ until the AHJ is satisfied. I'm not really too concerned with the specifics, so long as the AHJ has their say in a building this big that DOESN'T HAVE SPRINKLERS (!)
Steve Leyton PROTECTION DESIGN & CONSULTING -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Ed Kramer Sent: Monday, April 23, 2007 12:25 PM To: [email protected] Subject: RE: Water supply NFPA 14 Standpipe & Hose System Tony - in the 2003 edition, sections 7.10.1.1.2 and 7.10.1.2.2 address flow rates for 'horizontal' standpipes. They should answer your 1st question. Ed Kramer Littleton, CO > >I'm designing a class 3 standpipe system for a single storey 300,000 >sq.ft. >metal fabrication plant. No city water, so needs a water storage pond. > >I'm trying to figure out the required storage volume. NFPA requires 500 >gpm >from the most remote standpipe and 500 gpm from each additional stand pipe >(for floor area exceeding 80,000 sq.ft.) with total not exceeding 1250 >gpm, >for a duration of 30 minutes. My opinion is that NFPA 14 mostly covers >multi-storey buildings. When it's single storey, should I take each hose >connection as a standpipe and flow 250 gpm per connection, up to maximum >1250 gpm? It is probably the safest, as it would be the most conservative. >Has anyone come across this situation? > >The other question is regarding hose allowance for fire department. (The >building code water supply requirement does not apply in my area, if the >building has either a sprinkler or standpipe system.) NFPA 14 requires a >standpipe system to be designed for the system demand and fire department >connections. It says to consult the AHJ for water supply from fire >department pumper. Would it be system demand OR demand for fire department >pumper (the larger value and not both simultaneously)? Or should a hose >allowance be used same as for a sprinkler system? If so, for what >duration? > >Another question (while I'm at it), NFPA 14 requires lateral piping to 2 >1/2" hose connections to be protected if the building is not sprinklered. >Up >to now I've never seen piping in a single storey building in fire rated >enclosures. Is it required? > >Tony > >_______________________________________________ >Sprinklerforum mailing list >[email protected] >http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > >To Unsubscribe, send an email to:[EMAIL PROTECTED] >(Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
