So instead of looking at it as two systems, flip the paradigm a bit and consider this to be just a single combined sprinkler standpipe system. If you're looking at it through NFPA 13 goggles, then it's sprinkler-centric and doesn't talk about standpipes. But if you base your design on NFPA 14, it's a little easier, I think. I'm assuming this isn't a high-rise building, so the FDC is paramount as it's your water supply for standpipes, correct?
So if you configure a standpipe system sprinkler riser with control valve, alarm switch, etc. (same as you have now) and then bulk to your standpipes with a sectional shutoff for each one, you've accomplished distribution and your FDC can be anywhere along the bulk main downstream of the riser. After that, tack on your floor sprinkler systems as needed in accordance with 6.3.5. What's happened is that you have an "orderly" arrangement of sprinkler connections off of a single standpipe above the basement, leaving that one as an orphan that is being fed in the riser room. That it's directly fed from the riser after the bulk main gives the appearance of the standpipe system being subordinate to the sprinkler system, at least at that point. So I guess I'm agreeing with the AHJ that another control valve is required, but you can configure the system so that you don't have to pipe the FDC back to the riser. SL -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Martinez, Dewayne Sent: Friday, June 06, 2014 8:04 AM To: [email protected] Subject: RE: control valve on standpipe bulk main? There is a header in the riser room with one riser for the basement sprinkler system (w/ control valve) and another riser for the standpipes (no control valve). One of the standpipe stairwell risers will be a combined standpipe / sprinkler with the correct control/check valves installed per NFPA. I guess I could bring the basement system off the standpipe riser if needed. -----Original Message----- From: Sprinklerforum [mailto:[email protected]] On Behalf Of Steve Leyton Sent: Friday, June 06, 2014 9:27 AM To: [email protected] Subject: RE: control valve on standpipe bulk main? How are the sprinkler mains configured after the stand pipe bulk main branches off? Steve <div>-------- Original message --------</div><div>From: "Martinez, Dewayne" <[email protected]> </div><div>Date:06/06/2014 6:43 AM (GMT-08:00) </div><div>To: [email protected] </div><div>Subject: control valve on standpipe bulk main? </div><div> </div>NFPA 13 or 14 (07ed) Situation: Water supply with BFP supplying one wet system and one standpipe system. Wet system has a control valve in the riser room but we would like not to put a control valve on the standpipe riser / bulk main in order to connect the FDC to it father down in the building. Each stairwell standpipe will have a control valve to isolate it off the standpipe bulk main. AHJ is requiring an additional control valve on the bulk main in the riser room which would require us to now run an additional 250ft of 4in pipe to the FDC location. Of course he won't state where he gets this requirement just that he wants it. I have piped several buildings this way in the past. Have I been doing it wrong all these years? Thanks, Dewayne _______________________________________________ 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 _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprinkler.org
