Natural Gas Lines
In Oregon, Natural Gas can be piped underground through plastic, and I think it is HDPE, but it is yellow, or some other color.
However, HDPE is not allowed above ground due to possible physical damage or especially fire.
From a pirate's perspective, PEX makes a dandy gas line. It is sturdy, lasts forever, very easy to work with and cheap. But using it in-house has the stupendous disadvantage that if there was a house fire, the PEX would melt and unleash an inextinguishable fire... bad, bad, bad.
I do remember hearing about problems with physical connectors that were, for a while used to connect from the HDPE gas lines to above ground iron pipe. As I recall, the physical connectors were Shark Bite kind of things, and over time they failed, I suppose because of corrosion.
If I am right, and the NG line is HDPE (not PEX), then it could be fusion-welded to HDPE fittings that are physically designed to accept iron fittings.
This pirate is temporarily using PEX for an in-house gas dryer connection, so it does work.
-AC
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I'm not an HVAC technician. In fact, I'm barely even a hacker...
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