CSST comes with it's own problems. Hard steel pipe only presents an electrocution hazard, they are afraid lightning might actually blow CSST open if you get an arc. (Hence the black stuff that is arc resistant) I really do not have much experience with it because the state did not use it at all. Everything was galvanized rigid gas pipe.
The zinc coating on galvy can chip or flake and get introduced into the gas line during installation which may end up clogging the burner orifices or valves.
Simple common sense. Don't introduce a spark potential around flammable gasses.
Black steel pipe is used here for gas. I think there is a reason why galvanized is not generally used. Also includes copper tubing with flare connections and brazed copper pipe.
Gas pipe is not allowed to be used as an earthing electrode, which may be why the NEC does not require bonding of gas pipe similar to water pipe.
Information on CSST from a few years ago from an electrical inspector who did some research: CSST has a very thin wall. There are a few ways a high voltage can momentarily develop between gas pipe and the electrical system. That can cause an arc, which can result in a hole in the very thin-wall CSST. If you are lucky that will just cause a fire. Because of fires, manufacturers now require CSST be bonded to the electrical earthing system Manufacturers have different requirements for bonding. The suggestion was for electricians to not do the bonding - then they will not be involved in the lawsuit. (Bonding is not required by the NEC.) If you do bonding, follow the instructions from the manufacturer EXACTLY. System bonded using the manufacturers requirements have caused fires. IMHO CSST is not a good product. Why is an "arc-resistant" version necessary? I wouldn't trust the arc-resistant stuff either.
Lightning transients have high frequency current components. The inductance of a bond wire is likely much more important than the resistance. Bonding, particularly where the path length gets long, may not be as effective as it would seem. As with phone/cable/other, having the CSST entry near the electrical entry is likely a good idea.
Here in Ontario up untill about 10 years ago you could NOT use galvanized for gas. If an inspector found 1 piece of galvanized the gas was locked off untill it was replaced. Guys sometimes got around it by painting the gasline yellow and hiding the galvanize.
Galvanized is now allowed. All gas lines must be bonded to the electrical ground and metallic water pipes - and water meters, softeners and water heaters need to have bonding wires across them.
I think the galvanized gas pipe is certified differently than water pipe (less loose plating allowed) but it is all I ever see here. "Black iron" quickly becomes "Red iron" here.
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