Existential Angst wrote:
Awl -

I'm doing some demo on my 50's kitchen, which was done pretty well,
overall -- 3/4 black pipe to a 6 burner stove, etc.
Except, they tee'd off underneath for the gas line to the oven, using
1/2 or 5/8" copper, flare fitting.

I've been told copper gets brittle with natural gas, and is therefore
against many codes. Is this accurate? Is this a recent discovery? Seems odd
that the original installers would use 3/4" black pipe, and
then wimp out at the end.

Are there similar restrictions with copper and propane? Other gases?
If this restriction is only with nat gas, I assume it's because of the
sulfer additive (smell) that reacts with the copper.

It depends on the content of your natural gas. The inspector's office told me
copper was OK now here in Seattle, FWIW. If you are concerned, talk to the
inspector locally, or your gas supplier.