Originally Posted By: Donald
Originally Posted By: Stelth
Black pipe will rust, and rust quickly if it's exposed to moisture, and I assume there's plenty of that in upstate New York. So you should either paint it, and keep an eye out for corrosion, or used galvanized pipe. Don't bury black pipe in the ground, use the coated pipe that's made for that. And use any color teflon tape you like.
One should never used galvanized pipe for gas. Chunks of galvanizing can break free and flow down the pipe.
When I was first getting started in plumbing, about 30 years ago, I read voraciously whatever books I could get my hands on. I remember reading about this "flaking" thing with galvanized. In 30 years, I've never seen an orifice plugged by a bit of zinc. Of course, I've done most of my plumbing in So Cal, where we have clean, dry gas. In San Diego, galvanized pipe is required anywhere that steel gas pipe will be exposed to weather (at least under 2" pipe size). In Los Angeles, galvanized pipe is not allowed. Go figure. I've also opened a few drip legs that have been in service for decades, and there was nothing in them. However, natural gas isn't the same everywhere, and the same may be true for LP.
I think that the presence of hydrogen sulfide in coal gas and/or town gas may have caused problems with galvanized pipe. Not sure on that one.