Natural gas with a hydrogen sulfide concentration of 0.3 grams per 100 cubic feet should not be used with copper or brass.
Just because you have used copper in the past and got away with it doesn't mean it's OK. I've seen copper turn black, flake off and choke the gas valve. I changed to SS flex pipe back when I had NG. Now I'm happier with everything total electric.
A half inch line may not carry enough NG. Depending on furnace, water heater and gas dryer size.
I would check with local building inspector before even thinking of using copper. My gas company inspected my black pipe before they connected my meter.
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Today's Featured Article - Third Brush Generators - by Chris Pratt. While I love straightening sheet metal, cleaning, and painting old tractors, I use every excuse to avoid working on the on the electrics. I find the whole process sheer mystery. I have picked up and attempted to read every auto and farm electrics book with no improvement in the situation. They all seem to start with a chapter entitled "Theory of Electricity". After a few paragraphs I usually close the book and go back to banging out dents. A good friend and I were recently discussing our tractor electrical systems when he stated "I figure it all comes back to applying Ohms Law". At this point
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