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-   -   Rust suppression in a radiator, suggestions? (http://www.homebrewtalk.com/f51/rust-suppression-radiator-suggestions-356958/)

dinnerstick 09-26-2012 04:30 PM

Rust suppression in a radiator, suggestions?
 
I'm pumping water through a radiator for heating and cooling of my fermenter, and the water comes out black. after one full fermentation run the hoses (beer line) are opaque black/rust red. does anyone know what would be good to run through this system to stop the rust? there is no chance of contact with the fermenting beer so it can be as poisonous as you like. the liquid goes through a small heat exchanger, radiator, and tupperware reservoir. does car antifreeze have anti-rust properties?? any suggestions welcome, thanks

dinnerstick 09-26-2012 04:32 PM

and it goes through a small impeller pump, i forgot to add.

bja 09-26-2012 06:04 PM

You need to flush out the radiator. There's nothing in there to rust, it's all either brass/copper or aluminum, unless you've added something made of steel.

Antifreeze is a rust inhibitor.

crash1292 09-26-2012 06:08 PM

try using RV anti freeze,its non toxic.
dont know about its rust inhibitor property's

dinnerstick 09-26-2012 08:22 PM

this thing is steel, painted on the outside. no idea what it was originally scavenged from before it was re-scavenged for beer. if antifreeze is a rust inhibitor then problem solved! cheers

JRems 09-27-2012 02:21 PM

Use automotive antifreeze. It has rust inhibitors. Also you can add just a few drops of dish soap to the antifreeze. You don't want it to get bubbly and foamy. The soap will help reduce surface tension and promote better heat transfer.

dinnerstick 09-27-2012 03:48 PM

awesome, i'll try it, thanks all

GreatWetNorth 09-28-2012 04:11 AM

You can get a corrosion inhibitor. It's a product that allows you to use straight water as coolant in your car if freezing isn't a concern. 'Water Wetter' is one brand name that I know of. Not sure how well it works but I remember reading about it in car mags. It gives you the option of using water as opposed to anti-freeze.

Tex 09-28-2012 04:27 AM

Use distilled water, it has the minerals removed so they cannot react with the steel and cause oxidation.

GreatWetNorth 09-29-2012 12:11 AM

Quote:

Originally Posted by Tex (Post 4451434)
Use distilled water, it has the minerals removed so they cannot react with the steel and cause oxidation.

I know distilled water is recommended for use in rads, but I have to disagree with the wording of that. The minerals may leave deposits that build up over time (which is why you use the distilled water), but the water itself is what reacts with the steel to cause the oxidization (which is why you also use anti-freeze or some other corrosion inhibitor). Yes ? No ?


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