Why is there a Class III standpipe required in the first place? Steve Leyton PROTECTION DESIGN & CONSULTING
-----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of A.P.Silva Sent: Monday, April 23, 2007 11:48 AM To: [email protected] Subject: Water supply NFPA 14 Standpipe & Hose System 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)
