I have not been on here long and have enjoyed most of the posts. One topic has come up a couple times now, so I want to just address this topic.
Should galvy be used on gas pipe and if so...when, where, and why?
NFPA 54 by definition of suitable gas pipe forbids any gas pipe inside a structure with a melting point below 1500F. Zinc melts just under 800F.
With this knowledge alone, an installer that cares would not put galvy inside a building again. It has nothing to do with flaking of the pipes interior and clogging screens...that is the purpose of a sediment trap.
So if you have a section of pipe or fitting with a flaw that gets zinc coated and now holds pressure, have you met the code. Of course not...not unless you intend to xray every inch of pipe to verify that it is the steel below and not the zinc above making the pipe whole.
I have plenty more on this topic but lets just go ahead and get the thread running.