Do you mean with with the increased number of sprinklers, hose stream can't be provided? Or not required? I'm confused, so I hope you can expand.
Take Class I,II,III commodities 25 ft. storage height, 35 ft. ceiling height, dry system, Number of sprinklers = 25 + 1 level of in-rack, Hose Stream = 500 Whereas, same commodities, 20 ft storage height, 30 ft ceiling height, dry system, number of sprinklers = 25, but hose stream = N/A (or NCD) The extra 10 sprinklers (comparing dry to wet) at 25 psi, works out to 560 gpm (using k=11.2 heads). A little over the wet system Hose allowance for both cases. Do you mean the hose stream is already included in the dry system? In which case, there won't be much difference in the demand between wet and dry, if galvanized piping is used. Nothing to account for the dry system delay? Tony -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Roland Huggins Sent: May 19, 2009 8:31 AM To: [email protected] Subject: Re: Large drop sprinklers Hose stream N/A matches the number of sprinklers N/A making it a NCD - No Can Do Remote area: look at 22.4.4.2 Roland On May 18, 2009, at 4:07 PM, A.P.Silva wrote: > NFPA 13, 2002 table 12.3.2.2.1(a) or > NFPA 13, 2007 table 16.2.2.1(a) > > Large Drop Sprinkler Design Criteria for ........Class I through Class > IV Commodities ..... > > Two questions: > > (1) Hose stream allowance for some storage configurations with dry > systems are given as "not applicable". Why? > (2) Number of design sprinklers are given. But not how many on a line. > I guess a design rectangle can be worked out, but is that the intent? > > Tony > > _______________________________________________ > Sprinklerforum mailing list > http://lists.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 http://lists.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 http://lists.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)
