We always split the systems where the K factor changes. However, if the addition is small the total area is under 40k sqft you would probably have to change all the heads on that system to K17. Ron F
-----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of James Crawford Sent: Thursday, March 19, 2015 11:21 AM To: [email protected] Subject: RE: ESFR Sprinkler Heads Thanks Roland The AHJ has impose a greater reduction and if I use the new pressures the existing system is 3 psi short. My concern with using two different K factor heads is the overlap area where two different pressures would be required causing over discharge on the K17 heads. Thank you James Crawford Phaser Fire Protection Ltd. Phone 604-888-0318 Fax 604-888-4732 Cel 604-790-0938 Email [email protected] -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Roland Huggins Sent: Thursday, March 19, 2015 11:05 AM To: [email protected] Subject: Re: ESFR Sprinkler Heads you can have multiple design basis covering different portions of a building. They could present different K-factors or types of sprinklers. There are explicit requirements that address the interface between them. What do you mean the AHJ has dropped the pressure? Does that mean the water purveyor has dropped the pressure to the area or that the AHJ has imposed a greater reduction on the actual supply as a safety factor. In other words, is the existing system still providing adequate protection (not an issue for imposed reductions) ? Roland Huggins, PE - VP Engineering American Fire Sprinkler Assn. --- Fire Sprinklers Saves Lives Dallas, TX http://www.firesprinkler.org <http://www.firesprinkler.org/> > On Mar 19, 2015, at 9:40 AM, James Crawford <[email protected]> wrote: > > We are doing an addition to an existing warehouse, the existing > warehouse is protected with ESFR K14 uprights, since the building was > constructed the AHJ has dropped the water pressures in the area by 10 psi. > > > > Due to the pressure drop I cannot use the K14 heads for the addition, > can you mix ESFR sprinkler heads in the same warehouse area, I would > need K17 heads for the addition, The addition would be open to the > existing warehouse space. Or do I need to change all the heads in the > existing warehouse to match? > > > > > > Thank you > > > > > > James Crawford > > Phaser Fire Protection Ltd. > > Phone 604-888-0318 > > Fax 604-888-4732 > > Cel 604-790-0938 > > Email [email protected] > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkl > er.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
