I'm contemplating running natural gas from the gas entrance to my house to a
workshop approx. 200' away.
What type pipe can I use when running underground ?? I'm told that there is
plastic pipe for gas lines ??
I live in south louisiana where it's very humid.
My first choice would be polyethelene pipe that is rated for gas. You can
bury black pipe that is coated too, but it is more work and may not last as
long. The poly pipe would need to be done by someone that does HVAC work for
a living as it usually is not available to the general public. You probably
could dig the trench and have them lay the pipe.
Another concern would be the size of pipe. At 200 ft you may need to have
the gas utility bump your gas pressure up to 2 PSI to get the capacity you
Where I live you could use galvanized, black iron or poly.
Poly is out cause no one other that the utility has the tools and parts to
work with it. It is not allowed for residences other than the service. Which
is utility owned.
galvanized and black iron both need to insulated from the ground. That can
be done by tape or foam, here. You should be checking locally to see what
the rules are.
You should be contacting a plumber that can help you with the calculation to
your new load. Depending on the size of the load you could be running 2
inch or larger pipe.
There is a fairly new flexible gas hose now available for direct burial.
Its yellow in color and comes in various diameters. I once ran a gas
line from my meter to a small addition where i used a 50,000 btu input
heater ; i ran 3/4" i.d. gas line about 125 feet and it worked fine
without increasing gas pressure. Id try running a 3/4" gas line and
have someone check the furnace manifold pressure once its installed and
running. If it isnt approx. 3.5 " w.c. , then the Gas Co. can bump up
the incoming gas pressure.
This is Turtle.
Hey Davey , They don't sell the yellow flex pipe to the public even here in
Also Davie here in Louisiana they have 7 '' wc of pressure and the 3.5 wc your
talking about is after the gas valves and not the incoming pressure. You need to
read more about gas pressure before advising on it.
Most any plumber, or HVAC shop that plumbs gas should be able to do poly
underground. Call around. We install a fair amount of poly underground for
gas supply to out buildings.
Perhaps your codes are differant, but it is allowed here.
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