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Galvanic corrosion
JohnP3
Member Posts: 3
Just wanted your thoughts on dielectric unions vs. putting copper and galvanized together.
Thanks,
John
Thanks,
John
0
Comments
-
On whattype of system.
> Just wanted your thoughts on dielectric unions
> vs. putting copper and galvanized
> together.
>
> Thanks, John
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On whattype of system.
> Just wanted your thoughts on dielectric unions
> vs. putting copper and galvanized
> together.
>
> Thanks, John
To Learn More About This Professional, Click Here to Visit Their Ad in "Find A Professional"0 -
On whattype of system.
> Just wanted your thoughts on dielectric unions
> vs. putting copper and galvanized
> together.
>
> Thanks, John
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.
where are you making this connection--you can go with a brass ball valve on the galvanized then go to copper if its on a water heater i've had a lot of luck with using a galvanized coupling then go to copper ---it saves the nipple inlet&outlet of the heater0 -
Skip em
on closed loop heating systems, they cause more problems then they prevent.
But you need something be it a dielectric union or dielectric nipple on potable water applications.
For corrosion to occur you need O2 present. Open potable and DHW systems have a continous supply in the new water.
The CDA webpage has a lot of good reading regarding corrosion.
www.copper.org
hot rod
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galvanic corrosion
We use a 4-6" brass nipple or brass valve between iron/galvanized and copper to bridge the difference in metals. This helps reduce the dissimilar metals problem that causes galvanic corrosion. In general i agree that iron and copper on closed hydronics should not create much problem but we have chose the extra precaution. I have seen galvanic and or electrolysis on closed hydronics without separation of metals before, not exactly sure of cause but I don't think the extra ounce of precaution hurts. IMHO Tim0
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