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 - Earthmaster Project Progress Just a little update on my Earthmaster......it's back from the dead! I pulled the head, and soaked the stuck valves with mystery oil overnight, re-installed the head, and bingo, the compression returned. But alas, my carb foiled me again, it would fire a second then flood out. After numerous dead ends for a replacement carb, I went to work fixing mine.I soldered new floats on the float arm, they came from an old motorcycle carb, replaced the packing on the throttle shaft with o-rings, cut new ga
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