AS an an aside I can't find what a required distance between fire hydrants is, NFPA only says up to AHJ and FM is 300'
On Tue, Jul 13, 2010 at 4:58 PM, Firestone, James < [email protected]> wrote: > Dear Geir > > The New Zealand Fire Service has published a Code of Practice for Fighting > Water Supply (NZS PAS 4509:2008) - which can be freely downloaded from our > website > > > http://www.fire.org.nz/Business-Fire-Safety/Building-Design/Pages/Fire-safety-design.aspx > > Essentially there are two approaches you can take in this COP. A > prescriptive approach using Tables. Table 1 matches Building type/size to a > water classification, while Table 2 stipulates the required fire fighting > water for this classification. > > Or you can use a fire engineering approach and match the (energy) quenching > efficiency of water to the size of the fire that the fire fighters would be > faced with upon arrival. I have simplified this a lot just to get across the > main idea. > > Basically in answer to your question we want to encourage building owners > to put the resource (water) where the risk is (which is within the > building)! Thus the recognised advance of a sprinkler system which catches > the fire whilst still small. > > So as a recognised trade-off, if a structure is sprinkler protected (and > just using the prescriptive method of the COP), then it only requires an > additional 25L/s fire fighting water. > > So the volume of (fire) water supplied to the building MUST be the amount > required for the sprinkler and the (operational) fire fighting > simultaneously. However as a caveat to this, if sprinklers are installed we > do lend ourselves to negotiation on potentially allowing increased hydrant > distances, slightly reduced volumes (dependent upon risk, proximity to a > fire station, ease of fire fighting access around building, climatic > conditions, exposure protection requirements, etc.) where the building is > sited in a lower water serviced area than what is normally required OR if > the amount of water that is required to supply BOTH the sprinkler system and > fire fighting is greater than that required for just fire fighting (with no > sprinkler system present). The latter is a very rare case and usually more > an anomaly of the COP. > > Regards, James > > > James Firestone > Fire Engineer > National Headquarters, NZ Fire Service > P. O. Box 9346, Wellington, NZ > Level 6, 5-7 Willeston St, Wellington, NZ > Cell - 0274858056, DDI (04) 4708011 > [email protected] > > Fires are fast - home sprinklers are faster - don't delay inquire about one > today - see http://homesprinklers.fire.org.nz and keep yourself safe and > NZ green. > > > > -----Original Message----- > From: [email protected] [mailto: > [email protected]] On Behalf Of Geir Jensen > Sent: Wednesday, 14 July 2010 01:59 > To: [email protected] > Subject: > > On which conditions does sprinkler substitute fire brigade water flow > requirements? Never? Cannot figure out by NFPA 1 Ch 18 and NFPA 13. > Sprinkler demand and hose demand are to be added, except for 50 % or 75 % > reduction as per NFPA 1 Ch 18? > > How does NFPA 13 "hose allowance" relate to "fire flow requirements for > buildings" (NFPA 1, 18.4)? Are they equal for a given sprinklered structure? > > Does sprinkler protection have any influence on water supply duration > requirements? Shall duration comply with NFPA 1 or NFPA 13 for sprinklered > structures? Are requirements to "hydrant water supply" and "fire flow > requirements for buildings" both influenced, if any at all? > > Please accept the above very basic questions. I am working on guidelines > for sprinkler trade offs. As guideline become performance-based I need to > know if your prescriptive standards acknowledge sprinkler performance as is, > i.e. say reducing water supply requirements (flow and duration) to a level > sufficient for hose extinguishing of sprinkler controlled fires only. > > Geir > > Geir Jensen > COWI Fire > Technical Director > _______________________________________________ > 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]<to%[email protected]> > (Put the word unsubscribe in the subject field) > > ---------------------------------------------------------------- > This e-mail message has been scanned and cleared by MailMarshal > ---------------------------------------------------------------- > --------------------------------------------------------------- > This e-mail message has been scanned and cleared by MailMarshal > --------------------------------------------------------------- > _______________________________________________ > 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]<to%[email protected]> > (Put the word unsubscribe in the subject field) > -- Tom Poisal, CET _______________________________________________ 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)
