Well clarification is needed in this discussion. Ethyl glycol should never be
used even if the system has a rpz. From the purveyors view it is a higher
hazard than non-toxic types of anti-freeze.
It is possible for an rpz to fail and only an air gap seperation can prevent
contamination.
Forest Wilson
Cherokee fire
------Original Message------
From: Roland Huggins
Sender: [email protected]
To: [email protected]
ReplyTo: [email protected]
Subject: Re: Antifreeze and RPZ
Sent: Dec 24, 2008 10:53 AM
You can put in anything you like from the water purveyors view but
someone proposed to 13 that the restriction on antifreeze be removed
since it all requires an RPZ. I never expected it to pass but was in a
curious mood as to how conservative the TC might be feeling. It
floated like a lead balloon.
Roland
On Dec 18, 2008, at 9:47 AM, Thom McMahon wrote:
> Actually it's not "Out Dated" just modified by the water purveyor
> requirements for Backflow prevention. If your system has only a
> double check
> BFP then most, (NOT ALL) water purveyors will not let you put
> additives in
> the pipe. If you system has an RPZ BFP then you can put anything you
> like in
> the pipe. I've always been interested if the MIC guys change the BFP
> to an
> RPZ before they treat the system for MIC. Obviously they put in
> additives in
> the system which is connected to the water purveyors system. Do they
> recalc.
> the systems too, for the additional friction loss?
>
> Thom McMahon, SET
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