And after all that - if the AHJ is not convinced without a calculation, you'll do a calculation.
J. Scott Mitchell, PE Fire Protection Engineer | Projects Engineering CNS Pantex | 806.477.5883 | -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of rongreenman . Sent: Thursday, April 09, 2015 8:59 AM To: [email protected] Subject: Re: Hydraulic Calcs on an existing sprinklered building Tim, You have to decide if the new area is now a design area. Note I said A, not THE, design area as you may have more than one. I always wonder why folks are so hesitant to do a simple equation. Two stories of office over mercantile and I'd calculator the third floor LH and the first floor OH2. Same configuration but residential above and maybe then I'd skip the third floor but fifteen minutes for a hand dale or taking a leak while the confused cranked out a calc? Yeah, I'd probably do it anyway. On Thursday, April 9, 2015, Tim Stone <[email protected]> wrote: > Craig, The existing system was hydraulically calculated at the time of > Installation. The water supply has actually improved due to new > municipal water mains. > What System piping that has been taken apart is very clean and no sign > of MIC. > > Regards, > G. Tim Stone > > G. Tim Stone Consulting, LLC > NICET Level III Engineering Technician Fire Protection Sprinkler > Design and Consulting Services > > 117 Old Stage Rd. - Essex Jct., VT. 05452 > CELL: (802) 373-0638 TEL: (802) 434-2968 Fax: (802) 434-4343 > [email protected] <javascript:;> > > -----Original Message----- > From: Sprinklerforum [mailto: > [email protected] <javascript:;>] On > Behalf Of Brad Casterline > Sent: Thursday, April 09, 2015 9:42 AM > To: [email protected] <javascript:;> > Subject: RE: Hydraulic Calcs on an existing sprinklered building > > Ohhhh-- this is what threw me: > > "The existing hydraulic pipe schedule already in place is going to be > used to extend the system into the addition." > > Brad > > -----Original Message----- > From: Sprinklerforum [mailto: > [email protected] <javascript:;>] On > Behalf Of Tim Stone > Sent: Thursday, April 09, 2015 8:36 AM > To: [email protected] <javascript:;> > Subject: RE: Hydraulic Calcs on an existing sprinklered building > > Brad, I looked at that too, but in this case it is a hydraulically > calculated system already. > > Regards, > G. Tim Stone > > G. Tim Stone Consulting, LLC > NICET Level III Engineering Technician Fire Protection Sprinkler > Design and Consulting Services > > 117 Old Stage Rd. - Essex Jct., VT. 05452 > CELL: (802) 373-0638 TEL: (802) 434-2968 Fax: (802) 434-4343 > [email protected] <javascript:;> > > -----Original Message----- > From: Sprinklerforum [mailto: > [email protected] <javascript:;>] On > Behalf Of Brad Casterline > Sent: Thursday, April 09, 2015 9:26 AM > To: [email protected] <javascript:;> > Subject: RE: Hydraulic Calcs on an existing sprinklered building > > I don't think you are missing anything in that you would not have to > calculate it but I find that in 11.2.2. > You would have to do some flow testing though to make sure of 500 GPM > at the BOR and 15 PSI at the highest, which would be the existing 4th > floor. > QR vs SR is another question! > > Brad > > -----Original Message----- > From: Sprinklerforum [mailto: > [email protected] <javascript:;>] On > Behalf Of Vince Sabolik > Sent: Thursday, April 09, 2015 8:04 AM > To: [email protected] <javascript:;> > Subject: Re: Hydraulic Calcs on an existing sprinklered building > > Tim -- > > If it's a new remote area, definitely. I would probably provide calcs > regardless. > > - Vince > > > On 4/9/2015 8:56 AM, Tim Stone wrote: > > Hi, > > > > > > > > I am working on an existing light hazard building that is being > > remodeled and updated. The four story building (8400SF / floor) was > > built in 1992 > and > > is equipped with a hydraulically calculated sprinkler system. The > > bulk of the sprinkler system work on this project is to relocate > > sprinkler heads > to > > new ceiling layout and relocate a few mains and branchlines to > > accommodate new HVAC. > > > > > > > > A 1700 SF. 2 story addition is being built on one side and the > > sprinkler system is to be extended to cover this new space. The > > existing hydraulic pipe schedule already in place is going to be > > used to extend the system > into > > the addition. > > > > > > > > Is it required to perform Hydraulics on this 1700SF addition? 2010 ed. > > of NFPA 13, 22.4 does not indicate that it is. > > > > > > > > Am I missing something? > > > > > > > > Thank you in advance. > > > > > > > > Regards, > > > > G. Tim Stone > > > > > > > > G. Tim Stone Consulting, LLC > > > > NICET Level III Engineering Technician > > > > Fire Protection Sprinkler Design > > > > and Consulting Services > > > > > > > > 117 Old Stage Rd. - Essex Jct., VT. 05452 > > > > CELL: (802) 373-0638 TEL: (802) 434-2968 Fax: (802) 434-4343 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
