propylene glycol in an oil fired boiler system

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coalkirk
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Post By: coalkirk » Fri. Apr. 06, 2018 6:55 pm

hotblast1357 wrote:
Fri. Apr. 06, 2018 6:49 pm
Many people do it for the freeze protection.
My argument there is if the boiler fails to fire, and the home is unoccupied or not monitored, then the domestic plumbing is going to burst anyway and destroy the home. Freeze protection only makes sense to me if you have exterior boilers.

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windyhill4.2
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Post By: windyhill4.2 » Fri. Apr. 06, 2018 7:56 pm

The outdoor wood burner i used to have was filled with plain water & being an open to the air system, the water had anti-corrosion treatment in it.I never had it freeze during the 8 yrs i used it.

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McGiever
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Post By: McGiever » Fri. Apr. 06, 2018 11:22 pm

lsayre wrote:
Fri. Apr. 06, 2018 10:29 am
You should be able to purchase food grade propylene glycol at RV supply stores. It is used to winterize RV's.

That is RV antifreeze that *Coalkirk* has photo of above, but it shows on label that it has an "inhibitor" in it that renders it Toxic.


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VigIIPeaBurner
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Post By: VigIIPeaBurner » Fri. Apr. 06, 2018 11:45 pm

McGiever wrote:
Fri. Apr. 06, 2018 11:22 pm
That is RV antifreeze that *Coalkirk* has photo of above, but it shows on label that it has an "inhibitor" in it that renders it Toxic.
I'd be interested to see if Prestone lists the inhibitor in the SDS. I do know some RV antifreeze manufactures add mineral oil to lube and protect seals.

Coalkirk's pic shows the antifreeze is not to be diluted and is good for -50F. Referring to the charts linked in my earlier post, the Prestone product is already diluted with about 45% water.

Edit: I looked for the SDS for Prestone Waterline and found I had to sign in to get it - not something I wanted to get into. I grabbed the first one that came up on a google search. Nothing listed for inhibitor on that one.
Attachments
SDSAF222.pdf
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Post By: McGiever » Fri. Apr. 06, 2018 11:58 pm

yes, is says not to add water, but it had/has water already added when it was made and botttled.

It's not a bad idea for the mfg'r to pre-dilute for buyers as they most likely use a very good grade of water.
Having it diluted on-site leaves water quality questionable as for quality.

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