I already dumped the original post however, as I recall the concern was connecting the RPZ to Ferrous or non-ferrous pipe. I assume they have a concern for any cathodic reaction between the dissimilar material of the back flow and the steel pipe. Could you use a dielectric union between the RPZ 1-1/2" threaded connection and install the expansion tank.
Mike Cabral ---- Thom McMahon <[EMAIL PROTECTED]> wrote: > Mike: > > A couple of things jump right to mind. > 1. What is the purveyors backflow policy? (If they require RPZ protection on > all Fire Sprinkler systems with anything but water, you'll end up replacing > your double check with an RPZ.) (If they only require protection for > non-water additatives, you install an RPZ for the AF heads.) > 2. Does the Purveyor own the DCBFP? (Most water authorities require > protection of their water supply, but it is the owners responsibility to > provide that protection. The owner owns maintains and services the backflow, > to protect the water system of the purveyor.)(If you install a RPZ for the > AF heads off the existing Main, you've met all requirements of the Safe > Drinking Water act 1974, and national primary drinking water regulations.) > 3. Dose you water authority, have an "Installation Standard" or > "Installation Guidelines" or "Standard for Backflow Prevention", or a formal > "Backflow Policy"? > (I'd read these all very carefully, and if it doesn't match what your being > told, somebody is making it up as they go, and needs to be stopped.) (Or as > Geo. Would say "Just Say NO!") > > Thom McMahon, SET > Firetech, Inc. > 2560 Copper Ridge Dr > P.O. Box 882136 > Steamboat Springs, CO 80488 > Tel: 970-879-7952 > Fax: 970-879-7926 > > > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Mike Wisneski > Sent: Wednesday, July 02, 2008 6:21 AM > To: [email protected] > Subject: RE: Backflow device and steel pipe > > Well forumites, I've gat a new one (to me). > > Customer wants a small anti-freeze system on a loading dock. The existing > system is a steel pipe system with a double check backflow at the service > entry. > > Normally I would just tap into the closest main (5 feet away), drop down to > a reduced pressure backflow and install an expansion tank and the eight head > anti-freeze system. > > The water purveyor now tells me that is unacceptable. They want the > anti-freeze system tied into the ductile iron pipe at the service entrance, > before the existing double check, and fed with non ferrous pipe. They say > they do not want any type of backflow device fed with black steel pipe. > > This, I believe, is not a code issue. > > Has anyone run into this situation before? > > Thanks in advance, > > Mike Wisneski > > > > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) > > _______________________________________________ > Sprinklerforum mailing list > [email protected] > http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum > > To Unsubscribe, send an email to:[EMAIL PROTECTED] > (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://lists.firesprinkler.org/mailman/listinfo/sprinklerforum To Unsubscribe, send an email to:[EMAIL PROTECTED] (Put the word unsubscribe in the subject field)
