You have to have a main shutoff in any case. Steve
-----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Dewayne Martinez Sent: Friday, May 18, 2012 9:34 AM To: [email protected] Subject: RE: Standpipe question - control valve So would a control valve be required on the standpipe riser if I had a separate riser for the parking garage that did not come off the standpipe bulk? -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Steve Leyton Sent: Friday, May 18, 2012 11:18 AM To: [email protected] Subject: RE: Standpipe question - control valve The way I see it, you will have a single Combined System. So you will still need a main system riser, with whatever bells and whistles are appropriate, but you can have a single PIV/FDC (or Backflow) assembly as the main control manifold, or a main building system riser that includes those components. But the way you're describing it, the parking sprinklers are a floor system just like the residential floors above, that takes off from the bulk main, downstream of the main system riser. Disclaimer implied, SML -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Dewayne Martinez Sent: Friday, May 18, 2012 9:14 AM To: [email protected] Subject: RE: Standpipe question - control valve Thanks Steve Nothing to prevent taking the parking system off the standpipe bulk and when you pump into the FDC you will be able to charge every system. Some AHJ's up here call the standpipe bulk riser a "sprinkler" riser and require the additional control valve at the riser per 13. I just wanted to check if I have been doing it right all these years when I omit the control valve at the riser. -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Steve Leyton Sent: Friday, May 18, 2012 10:48 AM To: [email protected] Subject: RE: Standpipe question - control valve If I understand it correctly, you have a service entry to the building, then a split between a standpipe bulk main and an individually valved basement sprinkler system. Then you supply 3 standpipes and one of those will be a combined riser serving standpipes and sprinklers. And you want to connect the FDC to the bulk main. If that's the scenario ... 6.3.2 requires that you have an isolation valve for each standpipe riser, and you will have a control valve on the parking garage system. The FDC will be pumping through four control valves on the mains (not counting upper floor sectionals), but if one of them is closed, the FD will still be able to pump to the other portions of the system. I am pretty sure there's nothing in the standard that precludes this, so long as you're not proposing to arrange the FDC tie-in downstream of one of the three riser sectionals. To keep it schematically typical per floor, is there any reason why you can't take the parking sprinklers off of the same standpipe that is supplying the upper floor sprinklers, with the POC downstream of the valve required by 6.3.2? The foregoing is my opinion only and does not necessarily represent the opinion or intent of the NFPA 14 Technical Committee on Standpipe and Hose Systems. Steve Leyton Protection Design & Consulting San Diego, CA -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Dewayne Martinez Sent: Friday, May 18, 2012 5:53 AM To: SprinklerFORUM Subject: Standpipe question - control valve Scenario..... Typical parking garage / residential building with 3 stairwells which require standpipe protection. One controlled system for the parking garage and one bulk riser to the standpipes. Each stairwell standpipe will have individual isolation control valves and the individual residential floors will be zoned off the standpipes. Does a control valve need to be installed on the standpipe bulk run riser? Would like to use the bulk pipe as part of the FDC piping to save some money. Thanks, Dewayne Martinez Design Build Fire Protection 262-784-7900 (w) 262-784-8401 (f) 414-349-0468 (cell) -------------- next part -------------- An HTML attachment was scrubbed... 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