Since first of all Natural Gas can ge a generic term for many different sub-types of Fuel Gas....lets get our terms clear.
Secondly, to be considered "sweet gas" the product could contain up to 5.6 percent of hydrogen sulfide (5.7% is the industry standard defining "sour gas").
Since copper is readily degraded in the presence of ANY hydrogen sulfide, copper, especially FLEXIBLE copper is a RISKY proposition.
I recall MANY years ago the aluminum industry promoted Aluminum wiring for use in homes. I still pity anyone who has a home with ANY aluminum branch circuits.
Remember the fiascos with gray potable plumbing as well?
Do you really want to be in the category of a class action or worse yet...being blown up/fire? Keep in mind that although MN allows, it requires the lines be TIN LINED. Can you imagine trying to justify the integrity of any flex copper connections, or bends? LMAO!
Not to mention that to PROPERLY BEND FLEX copper for ANY FUEL GAS situation, one must have the proper sized matching BENDING tool (so to install would cost the homeowner hundreds if not thousands in one-time use tools), and involves a HIGH degree of SKILL to do so PROPERLY.
Not to mention required coatings for exterior and burried applications, presure testing, etc. etc. etc. Frankly, I think its absurd for ANY DIY'er to consider copper ANYTHING for fuel gas applications, and find the liberal codes in some states to be a cheap "buckling under" to a financially free-spending lobbing industry. Not surprisingly The western states that first allowed this stupidity are copper minning states, trying to subsidize the dying US copper mining industry.
Also....in some states (mine included) YELLOW PAINTED COPPER ANYTHING means NON-POTABLE WATER.
For the DIY'er especially to an external BBQ Grill, go Black Pipe, period. You can rent a threading machine, or modify your plans to use "stock" pieces, or have your local box store cut and thread pieces to YOUR specifications. Simple, end of story.
Hey...remember all the nasty about those flexible brass connectors (copper content) that had a useful life of less than 15 years in "sweet gas" environments, and were allowed for connections? (failed whenever moved or crimped?)
Forget the flex copper, or copper period. That's my opinion, esp. for the DIY'er, and I'm sticking to it.
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