I was wondering why they are required now, but were not in the past. -----Original Message----- From: Steve Leyton [mailto:[email protected]] Sent: Monday, July 12, 2010 10:14 AM To: [email protected]; [email protected] Subject: RE: Check valves on floor control stations
You can't have a single standpipe connection without a check valve. Steve Leyton Protection Design & Consulting San Diego, CA -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Brad Sent: Monday, July 12, 2010 7:56 AM To: [email protected] Subject: RE: Check valves on floor control stations Sorry if this has been mentioned--- on a single stand pipe connection, without the check valve, would it be possible to do an inspector's test on say, the 3rd floor, without moving the flow switch on the 2nd or 4th. Would a flow switch 'moving backwards' send a signal? -----Original Message----- From: Ron Greenman [mailto:[email protected]] Sent: Monday, July 12, 2010 9:26 AM To: [email protected] Subject: Re: Check valves on floor control stations Think about what a check valve is for--to confine the flow of water to one direction only (trapping a section in the example given by Damien is a secondary positive aspect but not the reason--many cows are brown but not all). If you have a combined pipe on a low rise structure you typically are using a single standpipe/riser combination. All flow is in one direction and if your pipe fails you're screwed. If a high-rise you'll have at least two combination pipes and if one fails you'll still have water from at least one direction. So where you used to have flow from two directions into a loop you now have flow from one direction into the loop with essentially an open end. If you can't check the flow to the open end you'll just have water flowing through the floors and it would be similar to pumping into an FDC on a sprinkler system that didn't have a check on the incoming feed line. You'd just pump around in a circle. On Mon, Jul 12, 2010 at 6:26 AM, A.P.Silva <[email protected]> wrote: > Sorry, I meant '02 editions. That was my question. Whether check valves were > required in '02? > > As for the difference in the figures, A8.17.4.2(b) is when you don't have a > fire hose connection. So no contradiction. > > Tony > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Todd Williams > Sent: July 12, 2010 3:54 AM > To: [email protected] > Subject: Re: Check valves on floor control stations > > Not sure about the '03, but it was not the case in '02. An interesting side > note: in both the '07 and the '10 editions, figure > A8.17.4.2(b) shows a floor control without a check valve, but figures > A8.17.5.2.2(a) and (b) show the floor control with a check valve. > Since the text supports the latter, that one wins. > > > At 12:11 AM 7/12/2010, you wrote: >>I think this requirement was from the '07 editions of 13 & 14, and was >>not a requirement in the '03 editions. Can someone please confirm. >> >>Tony >> >>_______________________________________________ >>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) > > Todd G. Williams, PE > Fire Protection Design/Consulting > Stonington, CT > 860.535.2080 > www.fpdc.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) > -- Ron Greenman Instructor Fire Protection Engineering Bates Technical College Tacoma, WA Member: AFT WA 4184/AFL-CIO, SFPE, ASCET, NFPA, AFSA, NFSA AFAA, NIBS, WSAFM, WFC _______________________________________________ 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) __________ Information from ESET NOD32 Antivirus, version of virus signature database 5272 (20100712) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.com __________ Information from ESET NOD32 Antivirus, version of virus signature database 5272 (20100712) __________ The message was checked by ESET NOD32 Antivirus. http://www.eset.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)
