I'm trying to get the finishing touches on the shop, and it's starting to
get cold here in Chicago. When the shop was in the building process, I
inquired with one of the city building inspectors about the proper way of
running a line for natural gas. He oh-so-subtlely suggested that I wait
until they were gone, and put it in after the fact. So, before the ground
gets frozen, I need to get this puppy in. I need to go about 50' to get
into the shop, then about another 35' to where the heater is. I'm wondering
what is typical as far as the gas line goes. From what I read, it seems
that some use polyethylene tubing, and others use regular black pipe. I've
even read about special galvanized "gas pipe". Any thoughts or suggestions?
Old way was to black iron from the street valve to the regulator at
the house, then black iron for the inside distribution.
When the iron developed leaks, a plumbing contractor pulls the orange
plastic line inside the black iron and you are good for life.
I had to have this done once and it was not that expensive considering
it was done on an emergency basis.
Today, I'd talk to a plumber first, especially considering the permit
Don't want to get a permit?
Have a fire and the first thing insurance company is going to check is
that everything was according to permits.
A current "crisis" is people installing NG generators and finding their
pipes aren't big enough to supply everything. I would think there would be
a similar problem with filling the pipe with a PE liner. No?
Normal for most places is 0.25 PSI - just a quarter of a PSI. At that low
of pressure, you need a decent size of pipe in order to supply large
volumes. Depending on the length of run, you need 3/4" pipe somewhere
between a 2.5KW and a 7.5KW generator, and by the time you're at a 12KW
generator, it doesn't take a terribly long run before you're looking at a
Take a look at the NG supplies outside some restaurants. They're often
My info is definitely dated, but when I lived in Cleveland, East Ohio Gas
had a low pressure system (about 12"-15" of water column) and Columbia gas
used a higher pressure distribution (about 15PSIG) along with a pressure
regulator at the service entrance point of the building.
Assume not much has changed since I left.
Around here it is getting pretty standard to run 2 PSI gas pressure into the
home, and regulate it down at each appliance. The installers get by running
everything in 1/2" stainless steel flex tubing that way. It also helps on
those long runs out to the shop. We bury 1" poly and at 2 PSI.....well, it
will run about anything a normal person can find to hook up to the gas line!
Here the supplies run at 100+psi to local sub's, then down to 15psi and
final reg on arrival at the premises to inches of water level, even the
higher pressure mains (6" and below + possibly larger) are being
replaced in poly.
I work for a HVAC company and ALL we put in the ground is poly. As far as I
am concerned there is no other option! Black and galvanized pipe, no mater
how well it is covered and protected will fail eventually, sometimes fairly
soon. I replaced an underground gas line that was done in coated black pipe
that was underground for about 10 years. It failed at a fitting because the
protective tape and sealant did not hold up. Plus any where there was a nick
in the coating it was rusting badly and was due to fail. The house I live in
has black pipe going to the garage and I am getting ready to rip it out
before it fails!
I would look for a company that installs poly underground gas, dig the
trench yourself, and have them install the pipe. The worst part is digging
the trench! It would take less than one hour for them to lay the pipe and
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