Richard- The specs on the job require 1 level on in rack sprinklers, no such luck.
Brian Harris FDFP Inc. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] Sent: Wednesday, April 20, 2011 11:01 AM To: [email protected] Subject: RE: Balancing Rack Calc's Bryan, have you looked at all the options Not to use rack sprinklers,ESFR,CMSA...a lot of heads out there that would eliminate rack sprinklers. -- Richard Carr, SET ---- Matt Grise <[email protected]> wrote: > Brian, > > I have seen that it matters which has the higher pressure for exactly the reason you are describing (when adding racks to an overhead system). If one requires too high a pressure, it may overflow the other enough to blow the calc. > > I agree with the others though... if you can, just build the entire system into one model and let the computer hash it out. > > Matt Grisé PE*, LEED AP > Sales Engineer > Alliance Fire Protection > 130 w 9th Ave. > North Kansas City, MO 64116 > > *Licensed in KS & MO > > 913.888.0647 ph > 913.888.0618 f > 913.927.0222 cell > www. AFPsprink.com > > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On Behalf Of [email protected] > Sent: Wednesday, April 20, 2011 9:25 AM > To: [email protected] > Subject: RE: Balancing Rack Calc's > > Brian, > > If this is a new system with roof & rack systems,then calc them as 1 > system,adjust pipe size to give the required demand at each area and no > other balancing is needed.It's when you are adding a rack system to an > existing roof system riser that balancing is required.I was told by F.M. > years ago that if the 2 systems were within 1 PSI of each other,they > would not ask for a seperate balancing calc.Good luck. > > Lamar Vaughn,SET > > > On Wed, Apr 20, 2011 at 10:12 AM, Brian Harris wrote: > > > Travis- > > I'm using HydraCalc > > > > Brian Harris > > FDFP Inc. > > > > -----Original Message----- > > From: [email protected] > > [mailto:[email protected]] On Behalf Of Travis > > Mack, > > SET > > Sent: Wednesday, April 20, 2011 10:10 AM > > To: [email protected] > > Subject: Re: Balancing Rack Calc's > > > > What calc program are you using? Just put both the rack and overhead > > system > > in the calc file and let the computer balance. > > It has been over a decade since I did a 'separate' calc for each. > > Travis Mack, SET > > MFP Design, LLC > > www.mfpdesign.com > > > > Sent on the SprintR Now Network from my BlackBerryR > > > > -----Original Message----- > > From: "Brian Harris" <[email protected]> > > Sender: [email protected]: Wed, 20 Apr 2011 > > 10:06:42 To: <[email protected]> > > Reply-To: [email protected] > > Subject: Balancing Rack Calc's > > > > I knew sooner or later my luck would run out and I'd have a job with > > racks, > > yes ladies and gentlemen this is the first time I've had to do an in > > rack > > system. I've searched through code, searched past archives, and still > > am not > > all warm and fuzzy with my conclusion, if someone would be so kind as > > to > > either give me either an amen or send me to the corner with a dunce > > cap I > > would greatly appreciate it. > > > > > > I have done my overhead calc's, done my rack calc's, they are balanced > > to > > within .5 psi of each other at a common point on the riser. My > > question is > > this: does it matter which calc has the higher of the two pressures? > > The > > reason I ask is when it comes to the combined calc and you balance the > > flow > > at the common point on the riser I have tried two scenarios, if the > > higher > > pressure is on the rack system and you plug in the "balance" formula I > > get > > 981 gallons I need to add to the rack system which will work. If I > > tweak a > > couple things and the overhead system is the higher pressure and plug > > that > > into the "balance" formula I get 181 gallons that I need to add to the > > overhead system and that will not work. What is the consensus of the > > forum? > > > > > > Brian Harris > > > > First Defense Fire Protection > > > > 11957 Ramah Church Road > > > > Huntersville, NC 28078 > > > > Phone: 704.948.3506 > > > > Fax: 704.948.3507 > > > > Nicet # 128476 > > > > > > > > > > > > > > ======= > > Email scanned by PC Tools - No viruses or spyware found. > > (Email Guard: 7.0.0.21, Virus/Spyware Database: 6.17320) > > http://www.pctools.com/ > > ======= > > _______________________________________________ > > 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) > > > > > > > > > > > > ======= > > Email scanned by PC Tools - No viruses or spyware found. > > (Email Guard: 7.0.0.21, Virus/Spyware Database: 6.17320) > > http://www.pctools.com/ > > ======= > > > > > > > > > > > > ======= > > Email scanned by PC Tools - No viruses or spyware found. > > (Email Guard: 7.0.0.21, Virus/Spyware Database: 6.17320) > > http://www.pctools.com/ > > ======= > > _______________________________________________ > > 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) > _______________________________________________ > 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) ======= Email scanned by PC Tools - No viruses or spyware found. (Email Guard: 7.0.0.21, Virus/Spyware Database: 6.17320) http://www.pctools.com/ ======= ======= Email scanned by PC Tools - No viruses or spyware found. (Email Guard: 7.0.0.21, Virus/Spyware Database: 6.17320) http://www.pctools.com/ ======= _______________________________________________ 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)
