NFPA 13 2002 Edition 11.2.3.1.3; "An allowance for inside and outside hose shall not be required where the tanks supply sprinklers only." Since the tank supplies both site fire hydrant and fire sprinklers, it needs to accommodate both the site and sprinklers. The questions I think needs to be asked is for the site allowance, do you use the 1500 gpm (which is my guess) or the 250 gpm hose allowance?
Thanks, Gregg Fontes Cen-Cal Fire Systems, Inc. (209)334-9119 -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Ron Greenman Sent: Thursday, September 03, 2009 1:33 PM To: [email protected] Subject: Re: Fire Flow Far. And yes the fire flow accommodates the demand for both. I'm trying to figure how much storage is needed. On Thu, Sep 3, 2009 at 1:30 PM, David de Vries<[email protected]> wrote: > I don't have a quick answer, but out of curiosity, how far does the FD need to go to get another water source? > > BTW, the hose allowance in the sprinkler design must surely be part of the fireflow. > > Dave > > David A. de Vries, P.E., CSP > Firetech Engineering Incorporated > > > > > --- On Thu, 9/3/09, Ron Greenman <[email protected]> wrote: > > > From: Ron Greenman <[email protected]> > Subject: Fire Flow > To: [email protected] > Date: Thursday, September 3, 2009, 2:39 PM > > > When determining tank size on a property supplied only from a tank is > the sprinkler demand added to fire flow as a cumulative fire flow or > is it considered part of the fire flow? And if the former does the > hose stream need to be added or is it negated by the fact that the > tank is already supplying the hydrants? Example: 30,000 sqft fully > sprinklered building requires a fire flow (reduced 75% then rounded up > to the minimum) of 1500 gpm for 2 hours requiring a 180,000 gallon > tank. The sprinkler demand is 650 gpm plus a 250 gpm hose stream for > one hour for a total of 54,000 gallons. Is the 54K gallons included in > whole or in part with the fire flow storage or is it added? Thanks. > > -- > Ron Greenman > Instructor > Fire Protection Engineering > Bates Technical College > Tacoma, WA > > Member: > SFPE, ASCET, NFPA, AFSA, NFSA AFAA > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum > > For Technical Assistance, send an email to: [email protected] > > To Unsubscribe, send an email to:[email protected] > (Put the word unsubscribe in the subject field) > -- Ron Greenman Instructor Fire Protection Engineering Bates Technical College Tacoma, WA Member: SFPE, ASCET, NFPA, AFSA, NFSA AFAA _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
