My question was aimed at taking the Class II exception on a Class III system in a fully sprinklered building. If the building is not sprinklered (how does one manage to build an F-group building of 300K s.f. area w/o sprinklers?), I would tend to agree that you would calc' it out for 500+250+250+250 (or 500+500+250) for a total of 1250 gross. The AHJ should help you determine the water supply requirements because, technically, only the Class II component has to be automatic if the building's not classified as high-rise. If they'll accept wet-manual on the Class I design, then the reserve water supply will be for whatever they need in duration, i.e. 60 minutes x 1250 or whatever.
I'm not sure I understand the rest of your question though. The FD will tell you what inlet pressure to use on a manual design, and there doesn't have to be hose allowance if it's not sprinklered - it is a hose allowance. Presuming all of the inlet water is drafted from the reserve supply (pond). The pumper is not a "demand" it's a supply and it carries a maximum performance rating that is likely somewhere around 250-300 PSI at up to 1500 GPM. The one thing that I agree with for sure is your effort to talk the owner into putting sprinklers into the building ... I can't believe they'd consider moving forward without them - or that the building official would let them even have that choice. Steve Leyton PROTECTION DESIGN & CONSULTING My opinion only ... not an interpretation ... NFPA 14 TC .... blah, blah, blah. -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of A.P.Silva Sent: Monday, April 23, 2007 12:16 PM To: [email protected] Subject: RE: Water supply NFPA 14 Standpipe & Hose System A standpipe system is required due to size, for an unsprinklered building. It is a building code requirement. I'm trying to encourage the owner to sprinkler it to avoid a standpipe system and a larger water storage requirement. So I need to calculate the water storage for sprinklers and standpipe, for comparison. The class III is also from the building code, which requires both 2 1/2" hose connections (due to floor area) and 1 1/2" hose stations. Tony -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Steve Leyton Sent: April 23, 2007 12:58 PM To: [email protected] Subject: RE: Water supply NFPA 14 Standpipe & Hose System Why is there a Class III standpipe required in the first place? Steve Leyton PROTECTION DESIGN & CONSULTING _______________________________________________ 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)
