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Propylene Glycol Heat Transfer Fluid - Page 3

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Posted by DJ on May 24, 2005, 1:48 am

caraug@localnet.com wrote:


Assumptions are dangerous ;-).

Think about it: the potable water on one side of that heat exchanger is
running at 45-60 psi pressure. The glycol on the other side is running
at near ambient (around 5psi, as I remember). Which way is it gonna
leak if it cracks? ;-)

Their larger exchangers for using with hydronics, for instance, are
single wall shell and tube. And yep, those also are industrial quality.

Yep, they're a good bunch. Good to talk to as well, very helpful.


Posted by Cosmopolite on May 25, 2005, 1:31 am
DJ wrote:

I feel the same way. Leaks would always go from DHW to coolant.

Posted by Gary on May 25, 2005, 1:53 am

I think that "always" is a bit strong.  I'm sure the code people can
give you a long list of examples where fluid would flow from the
collector loop to the potable water.    I can think of a couple myself.


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Posted by nicksanspam on May 25, 2005, 10:49 am

GFX inventor Visile cites this frequently-mentioned worst-case scenario:
a fire truck hooks up to a fire hydrant and pulls a vacuum on an entire
municipal water supply system...


Posted by daestrom on May 25, 2005, 9:06 pm

Look at your kitchen sink.  Water in the tap at 40 psi, grey-water in the
sink at atmospheric pressure.  Water 'always' flows from the tap to the
sink.  Yet every plumbing code in the US requires that the faucet must end
*above* the sink and *never* extend down into the water (or have special
anti-siphon apparatus).  The concern is siphoning grey water back into the
potable lines when there is a drop in pressure.

A small leak from domestic water to glycol loop may go unnoticed for long
periods of time.  Depending on the system, you may only pressurize the
expansion tank or cause it to overflow.  No problems until you lose water
pressure from a blackout or some water main maintenance.  Now you have
poison in your potable water lines, and don't know it (except the water
tastes sort of 'sweet').  How many glasses of this do you drink?


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