I have run into this with 13D systems before that are installed without a backflow. In that situation, we have used brass fittings and nipples. I believe that cast iron and unlined ductile are AWWA approved.
A 6x4 cast iron flanged reducer takes out 9". A 6 x 4 Vic # 50 takes out 4". A 6" Vic #41 (which I have never used) with a 6 x 4 #750 takes out about 6". Anything outside of that would probably have to be fabricated. How about a piece of 6" ductile with a 6" Uniflange on one end and a groove in the other and use a 6x4 #750? Todd G Williams, PE Fire Protection Design/Consulting Stonington, CT www.fpdc.com 860-535-2080 (ofc) > On Apr 2, 2014, at 4:02 PM, Richard Mote <[email protected]> wrote: > > I've done it for years as well, but the National Plumbing Code prohibits the > use of any pipe or fitting that is not AWWA approved upstream of the > backflow, and the AHJ is enforcing it. Neither black nor galvanized steel > pipe is AWWA approved. We have had to buy cement lined 90° and tee's in the > past to comply. > > Richard L. Mote > Rowe Sprinkler Systems, Inc. > > -----Original Message----- > From: [email protected] > [mailto:[email protected]] On Behalf Of Mike > Hairfield > Sent: Wednesday, April 02, 2014 3:39 PM > To: [email protected] > Subject: RE: Flange x Groove Reducing Adapter > > Use a 6" steel blind flange and have your shop cut a hole and weld a > > 4" PEx Gr piece of pipe in it to the length you need, this has been > > done for years. > > > > Mike > > >> Date: Wed, 2 Apr 2014 12:29:15 -0700 >> Subject: Re: Flange x Groove Reducing Adapter >> From: [email protected] >> To: [email protected] >> >> How about a 6"x4" concentric grooved reducer with a 6" split grooved flange? >> >> >> On Wed, Apr 2, 2014 at 12:11 PM, Richard Mote >> <[email protected]>wrote: >> >>> Anyone know if there is a listed Flange x Groove Reducing Adapter on >>> the market, I just spent 30 min. searching the web but no joy. I'm >>> looking to go from a 6" flange directly to a 4" groove inlet on a >>> backflow, space is the driving factor. >>> >>> Richard L. Mote >>> Rowe Sprinkler Systems, Inc. >>> 7994 Route 522, Suite 1 >>> PO Box 407 >>> Middleburg, PA 17842 >>> P 570-837-7647 >>> F 570-837-6335 >>> >>> _______________________________________________ >>> Sprinklerforum mailing list >>> [email protected] >>> >>> http://lists.firesprinkler.org/listinfo.cgi/sprinklerforum-firesprin >>> kler.org >>> >> >> >> >> -- >> Juan Munguia >> Thorpe Design Inc. >> P 925.634.5758 >> C 209-380-0599 >> F 925.634.5975 >> E [email protected] >> W www.thorpedesign.com >> _______________________________________________ >> 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
