Originally Posted By: jruddy
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I just inspected an older home (built 1900-1920) and in the basement found two pipes that crossed and touched each another.
One was a branch off the main gas service pipe that serviced the water heater. This pipe was steel.
The other was a copper water pipe.
I would think that there should at least be some non-metallic separator between the pipes but wanted to know if there is any metallurgical action between the pipes just by being in contact with each other. Is there much chance of a spark since the copper is a softer metal?