Do copper condensate lines or return piping of heating/cooling units supported by galvanized hangers or other dissimilar metals constitute a potential for galvanic action?

Yes, the potential is there and that is why both the ODSC and the OMSC provide general requirements for the hanging or supporting of piping systems as follows: "Pipe hangers and supports shall have sufficient strength to withstand all anticipated static and specified dynamic loading conditions associated with the intended use. More.

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