We don't argue the RPZ requirement. We use non-toxic, but certainly have seen the Prestone jugs in numerous attics left by competitors. So you have to assume the worst if its your butt they'll sue for the other's later error.
glc -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Roland Huggins Sent: Thursday, January 21, 2010 3:19 PM To: [email protected] Subject: Re: Antifreeze Backflow Prevention bloody RPZ's have that annoying spitting characteristic too. As a sidebar, an RPZ is required for protection against toxic compounds but even non-toxic chemicals (like propylene glycol) get pushed into using it. SInce an RPZ is for toxic compounds, a cycle or two ago I attempted to delete the restriction against ethylene glycol when an RPZ is used. Needless to say, the TC decided not to depend on the RPZ that strongly. To be honest, I didn't do an extensive review to see how stringent the IPC is on compounds that actually are toxic since I knew it would fly like a lead balloon. Anyone that plays with systems with nasty compounds that takes water from a potable supply, feel free to send me an off-Forum email educating me further. Roland On Jan 21, 2010, at 11:41 AM, Matt Grise wrote: > Sorry...unclear wording. > > I meant that you could use either: > > 1) an RPZ at the riser, and a drilled check valve at the loop > 2) a double check bfp at the riser and an RPZ at the loop > > We sometimes use the second setup since RPZ's cost so much more than > DC BFP's. If the primary riser is 4,6,8" and the antifreeze loop > only needs a 1.25" RPZ, it can be less expensive to use 2 bfp's. > > Matt Grisé PE*, LEED AP _______________________________________________ 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)
