Draining system is one use of outlet at ground floor, usually only a few feet above FDC level. If you are in a location where water matters, it is even a recruit academy drill to hook up to lowest outlet and drain to desired location. Then with only a few feet of head push against the FDC opening clappers is not a problem for either water quantity or force. Lets say 8' x 0.433 psi /ft x 4.9 sq. in ~= 17 pounds + spring.
Might be the reason designers and reviewers sometimes see need for lowest 2 1/2" outlet differently. bv ----- Original Message ----- From: "Bobby Gillett" <[email protected]> To: [email protected] Sent: Thursday, May 2, 2013 5:54:24 AM Subject: RE: check valves on dry standpipes My only thought is when the fire department disconnects their hoses the water can come back through the FDC - some people may still install single clapper FDC's not thinking ahead or the clappers could stick or malfunction as well. Greg - in your case I could understand not needing one, other than the fact it is required. I would check with the AHJ and see if they will agree with you, then you are covered. Bobby Gillett Sr. Project Manager Key Fire Protection, Inc. (731) 424-0130 office (731) 424-9285 fax (731) 267-4853 cell www.keyfireprotection.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of John Denhardt Sent: Thursday, May 02, 2013 7:40 AM To: [email protected] Subject: RE: check valves on dry standpipes That is very interesting. I wonder what is the reason one is required? Steve????? John August Denhardt, P.E., FSFPE Strickland Fire Protection Incorporated 5113 Berwyn Road College Park, Maryland 20740 Office Telephone Number: 301-474-1136 Mobile Telephone Number: 301-343-1457 FIRE SPRINKLERS SAVE LIVES - Can you live without them? -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Bobby Gillett Sent: Thursday, May 02, 2013 7:07 AM To: [email protected] Subject: RE: check valves on dry standpipes We did a manual dry in a parking garage a few years ago, I asked this question to the local AHJ and he did require one. NFPA 14 (2013) - 6.4.2 requires one. Bobby Gillett Sr. Project Manager Key Fire Protection, Inc. (731) 424-0130 office (731) 424-9285 fax (731) 267-4853 cell www.keyfireprotection.com -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Greg McGahan Sent: Wednesday, May 01, 2013 10:01 PM To: [email protected] Subject: Re: check valves on dry standpipes T hanks - that makes three!~! On Wed, May 1, 2013 at 8:45 PM, John Denhardt <[email protected]>wrote: > Agree with you. No check valves required. > > Fire sprinklers save lives > > Sent from my iPad > > On May 1, 2013, at 9:44 PM, "Charles Thurston" <[email protected]> wrote: > > > Hello Greg, > > > > Is it a "Manual Dry" system? If so we do not and the AHJs in the area > see no reason to. > > > > Wednesday, May 1, 2013, 9:38:18 PM, you wrote: > > > >> Are you required to put check valves on FDC's supplyign dry standpipe > >> systems such as on docks etc? > > > >> Thanks, > > > > > > > > > > > > -- > > Best regards, > > Charles mailto:[email protected] > > > > _______________________________________________ > > 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 > -- Greg McGahan Living Water Fire Protection, LLC <http://www.livingwaterfp.com> 1160 McKenzie Road Cantonment, FL 32533 850-937-1850 fax 850-937-1852 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3272 / Virus Database: 3162/6290 - Release Date: 05/01/13 _______________________________________________ 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 ----- No virus found in this message. Checked by AVG - www.avg.com Version: 2013.0.3272 / Virus Database: 3162/6290 - Release Date: 05/01/13 _______________________________________________ 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
