Just as an example the Coffee Carts in Seattle need a backflow. You'd think in the land of lattes the folks would want coffee in their water. Back flow folks (the cross-connection guys) are charged with keeping the water healthy and pleasing. Now you and I can debate which, whether food grade glycerin or chlorination, is the most pleasing but the waster department adds the chlorine and your client adds the glycerine. Who has the end responsibility?
On Thu, Mar 11, 2010 at 8:58 AM, Thom McMahon <[email protected]> wrote: > Ed: > > Per the Colorado cross connection Control Manual, any additive to potable > water supply for fire protection requires a RPZ. The CCCCM references the > 1997 UPC Specifically 603.4.18.3 "Where anti-freeze, Corrosion inhibitors or > other chemicals are added to a fire protection system supplied from a > potable water supply, the potable water supply shall be protected by one of > the following: 1) RPZ assembly 2) RPZ/DC assembly" > > Additionally from Appendix "D" of the CCCCM 1999, "Drain Flow Chart" It > notes that drains which are required for all RPZ devices can discharge based > upon operating pressure XX GPM and that drain sizes X" are able to accept > XXX GPM. > > EXAMPLE: A 1" RPZ operating at a static pressure of 50PSI can discharge > approx. 65GPM. A 2" floor drain can only flow 55 GPM, and a 3" 112GPM, so > for a RPZ operating at 50PSI requires a 3" floor Drain. > > Example 2:A2.5" RPZ operating at 100PSI requires a 6" floor drain capable of > 450GPM, because at that pressure the RPZ could discharge up to 400 GPM and a > 5" floor drain can only take 350GPM. > > Please not specific discharge flows are available from some RPZ MFG.'s If > they are less you can use them. > > Here's what the IPC 2006 says: > 608.16.4 Connections to automatic fire sprinkler systems > and standpipe systems. The potable water supply to > automatic fire sprinkler and standpipe systems shall be protected > against backflow by a double check-valve assembly > or a reduced pressure principle backflow preventer. > > 608.16.4.1 Additives or non-potable source. Where > systems under continuous pressure contain chemical > additives or antifreeze, or where systems are connected > to a non-potable secondary water supply, the potable > water supply shall be protected against backflow by a > reduced pressure principle backflow preventer. Where > chemical additives or antifreeze are added to only a portion > of an automatic fire sprinkler or standpipe system, > the reduced pressure principle backflow preventer shall > be permitted to be located so as to isolate that portion of > the system. > > > > 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 Ed Kramer > Sent: Thursday, March 11, 2010 9:23 AM > To: [email protected] > Subject: Backflow protection on antifreeze system > > Anybody have a 2006 International Plumbing Code handy? > > > > I have a client who wants to use glycerine in a small antifreeze system. > Nothing unusual about that. But he claims that by using food-grade > glycerine he doesn't need an RP BFP and the associated expansion tank. I > disagree, but don't have code references to back it up. The 2006 IPC is > applicable. > > > > Thanks in advance! > > > > Ed Kramer > > Kramer Design, LLC > > Littleton, CO > > _______________________________________________ > 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: 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)
