Galvanic corrosion

JohnP3 · February 2005

Just wanted your thoughts on dielectric unions vs. putting copper and galvanized together.

Thanks,
John

hr · February 2005

On whattype of system.

> Just wanted your thoughts on dielectric unions

> vs. putting copper and galvanized

> together.

>

> Thanks, John

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hr · February 2005

On whattype of system.

> Just wanted your thoughts on dielectric unions

> vs. putting copper and galvanized

> together.

>

> Thanks, John

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hr · February 2005

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"

oil-2-4-6-gas · February 2005

.

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 heater

hr · February 2005

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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tim smith · February 2005

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 Tim

Galvanic corrosion

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