Is there a "best" way to install underground gas pipe? Is black pipe
preferred to galvanized or vice versa? Should fittings and possibly pipe be
covered with some coating like an epoxy paint or silicone caulk or some
other coating? Any other hints?
Thanks very much.
plastic it never rusts or corrodes, its special for gas lines
occasionally run in conduit for protection.
if you have a existing gas line thats leaking sometimes a plumber can
snake a plastic line thru your old metal line.
metal like steel of any type is a poor choice
Well since I am in the pipeline welding business and deal a lot with
undergound pipe I have to comment... First of all you have to consider
legalities of where and what your burying in gas pipe....some places won't
allow you to bury gas lines in steel nowadays.....underground threaded
connections in steel are also a "no no" in some areas....nowadays they use
plastic to bury gas pipe......after looking into that.......This is to
answer your question..
If your going to use steel then you should go black pipe ....Galvanized
pipe will break down with gas so don't use it (galvanized steel pipe is
mainly used with water)....then coat the black pipe with tar and then tape
over the tared pipe with plastic tape to seal the pipe from exterior
moisture. If you must use fittings underground, It's best after tarring the
piss out of the joint, to use heat shrink wrap type sleeves over the tar and
fitting for a good seal against moisture.....
Again...for your sake and your neighbours, please go
plastic pipe for underground use...The joints should be "fused"....not
threaded or Flanged together for underground use...
I just hope I didn't give help to someone that is running an
underground grow operation or anything................Jimi
Since you really have my curiosity , E:mail my business at
............... morriswelding at sasktel dot net
...I'll be glad to answer any questions in this regard....but need to know
the application before I can offer advice...especially when dealing with
gas... all the best....jimi
All the info Jimi outlines above is consistent with the info I got
about 10 years ago from NJ Nat Gas. At the time, I was president of a
condo association where we had underground black pipe failing that ran
from the meters to the units. This pipe was failing within 6 years of
being installed. I would not have believed it could fail that fast if
I hadn't seen it with my own eyes. The pipe looked like swiss cheese
in spots. If you looked at a length of it, you could see tar on the
top, and none on the bottom. They obviously had just poured tar over
it while it was in the trench. The untarred bottom was completely
NJNG at that time recommended replacing it with black pipe that was
properly tar coated and wrapped. They specifically recommended against
My first choice today would be plastic.
They make an underground iron pipe for gas Some of it looks like it's
wrapped with ten-Mil tape there is deferent types Check with a plumbing
supply.( not a big box store) But the best would be plastic gas pipe It
comes in rolls and is fused together there are transition pieces for when
you go out of the ground, I haven't done any underground gas pipe in long
time so I can't remember the names.
If you use plastic pipe, some suggest you bury with it some kind of metal -
like wire(?) - to make locating the pipe with an electronic gizmo easier. I
don't know the particulars - but check out the idea.
Thanks to all of you who kindly provided answers and info. I definitely
check out both the wrapped / covered black pipe and will probably prefer the
plastic based on the recommendations offered. My application is to feed a
natural gas powered emergency generator which sits a short distance from my
home (approx 10 feet) on a concrete slab.
Thanks again. This is an excellent newsgroup!
HomeOwnersHub.com is a website for homeowners and building and maintenance pros. It is not affiliated with any of the manufacturers or service providers discussed here.
All logos and trade names are the property of their respective owners.