1

Can I hang black gas pipe with copper hangers? Is corrosion a concern?

Example:

enter image description here

2 Answers 2

3

Galvanic corrosion is a worry only if there is complete circuit. With water pipes, cold water running through the line can make the wood conductive, so you use copper tape with copper lines. Gaslines in the house aren't going to be damp.

If you are worried about it, Insulate it. Put two turns of duct tape around the pipe whereever you're going to put a hanger.

3
  • 1
    Emphasize " if it is dry there is no galvanic corrosion." Commented Nov 20, 2019 at 22:18
  • @blacksmith37 What is “dry” ? Where I live, my silverware rusts in the drawer in my house. Fog, seasonal changes, etc. will affect “dry”.
    – Lee Sam
    Commented Nov 21, 2019 at 9:11
  • Silver 'rust' is a reaction to hydrogen sulphide or sulfur dioxide in the air. Not related to water induced rust, or galvanic action between two metals. Dry, to me, means that moisture condensing on not cooled object is rare. Commented Nov 21, 2019 at 20:40
2

Based on the wiki article galvanic corrosion, I would not use copper with iron pipe:

Statue of Liberty Galvanic corrosion in the Statue of Liberty Regular maintenance checks discovered that the Statue of Liberty suffered from galvanic corrosion

A spectacular example of galvanic corrosion occurred in the Statue of Liberty when regular maintenance checks in the 1980s revealed that corrosion had taken place between the outer copper skin and the wrought iron support structure. Although the problem had been anticipated when the structure was built by Gustave Eiffel to Frédéric Bartholdi's design in the 1880s, the insulation layer of shellac between the two metals had failed over time and resulted in rusting of the iron supports. An extensive renovation was carried out requiring complete disassembly of the statue and replacement of the original insulation with PTFE. The structure was far from unsafe owing to the large number of unaffected connections, but it was regarded as a precautionary measure to preserve a national symbol of the United States.

4
  • 1
    Link-only answers aren't considered valuable on Stack Exchange sites. If the link dies, so does your answer. Please copy the relevant information here, properly attributed.
    – isherwood
    Commented Nov 20, 2019 at 18:53
  • 2
    ... but we do like the link as well. I've proposed an edit which formats the quote as a quotation and restored the link. Commented Nov 20, 2019 at 21:18
  • 2
    This analysis ignores two more important factors : Sea coast environment ( strongly corrodes steel with no galvanic effect ), and very small anode to cathode area ratio. Commented Nov 20, 2019 at 22:22
  • I very much doubt that the S of L is water proof. Temperature driven condensation, rain and wind driven sea spray would have wet the contact areas. Commented Nov 21, 2019 at 20:42

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.