I will be installing quite a bit of copper tubing. Probably a 60' run of
3/8" hi-pressure run and several normal pressure 1/2" runs in the
neighborhood of 50-75 feet and possibly a 3/4" run of 25 feet or so (large
tankless water heater).
Wondering if there is a lower cost do-it-yourself alternative to copper
tubing. I installed underground plastic tube supplied by LPG dealer and they
came out to install the fittings and terminate it to the tank and regulator.
They way I get it the plastic fitting is a proprietary system that requires
some special connectors, tools and training. Even if this stuff was adequate
for indoors use, by the time I paid for the tube, fittings and the service
man to install all the connectors I'm back at the price of copper.
Some local codes, at least, do prohibit galvanized...
Recently there have been some studies that indicate that usage isn't as
much an issue as was one time thought (zinc reaction w/ trace
contaminants) but other data I've seen indicate that w/ more imported
gas and domestic supplies becoming more limited that those issues may
becoming more significant again...
Overall, I'd recommend against it (galvanized, that is) simply on basis
of long-time precedent irregardless of local code on the issue for
either NG or LP or LNG.
Of course it does, but it's less of an issue than galvanized in contact
w/ certain contaminants in gas, hence the historic proscription. I've
heard the flaking and orifice theory before as well, but never found it
codified for that specific reason (that's only saying I'm unaware of
where to find it written, not that it hasn't been).
Here is what I used for mine..its a pale pastel green pipe-coating..I bought
it in threaded lengths from a local plumbimg supply dealer. Local codes
also insisted on a black tape-wrap for the underground portion.
I said it was historic and that there were some recent reports
indicating it was less of a problem than some earlier data had implied.
As with anything else, new information eventually supercedes older.
Some of us old fogey's stay w/ what we were taught...I doubt I'll ever
get over the rule. :)
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