Can I use galvanized pipe holder on copper pipe?

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DPFAST
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Joined: Thu Oct 04, 2018 9:38 am

Can I use galvanized pipe holder on copper pipe?

Post by DPFAST » Wed Dec 12, 2018 11:10 am

Hi again guys. Several months ago I've repaired a loose shower head pipe by opening the wall around it and attaching a galvanized pipe clamp to a copper pipe. Before I did that I was advised on another board to use only copper or galvanized clamps.
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Now I am reading that you are not supposed to connect galvanized directly to a copper as a rapid corrosion will happen. Is that true?

I just remodeled the whole bathroom and I am not looking to mess with it again if I don't have to. I could open up the wall behind it where my bedroom is but I don't wanna do this if I could wait at least until the next summer. Please advice...
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A. Spruce
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Location: California, USA

Re: Can I use galvanized pipe holder on copper pipe?

Post by A. Spruce » Wed Dec 12, 2018 12:39 pm

No, you do not want galvanized or any other ferus metal touching copper because electrolysis will develop and not only cause corrosion, it can cause pin holes to develop in the copper. If you put a plastic or rubber isolator in between that would be fine, otherwise, use copper clamps on copper pipe.

Second problem I see is that you did not wipe your solder joints down after they were done to remove the excess flux. The flux will also cause corrosion (that's the green goo you see on the pipe ) and pin holes to develop over time.

Is this going to cause catastrophic failure in six months, no, you can probably last years this way, but there will be issues eventually, and the last thing you want to experience is a pipe bursting.
If the women don't find you handsome, they should at least find you handy.

DPFAST
Posts: 121
Joined: Thu Oct 04, 2018 9:38 am

Re: Can I use galvanized pipe holder on copper pipe?

Post by DPFAST » Wed Dec 12, 2018 3:33 pm

Thanks Spruce. No I did not solder anything just placed the galvanized pipe clamp around the loose Cooper pipe. All the green stuff is from the time when they built this townhome I think. As long as I can wait few months before I can fix this I'm happy.
One more thing though. This elbo, is this a galvanized metal? If yes could that caused this green thing to develope? Also, shouldn't this be changed to a brass elbo?

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A. Spruce
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Joined: Tue Aug 16, 2016 5:23 pm
Location: California, USA

Re: Can I use galvanized pipe holder on copper pipe?

Post by A. Spruce » Wed Dec 12, 2018 4:00 pm

That elbow is probably bronze, typical of a threaded elbow. Bronze is a copper alloy, so it doesn't cause electrolysis.
If the women don't find you handsome, they should at least find you handy.

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