Our home has all of the gas pipe run in black pipe with threaded
connection. We are in need of bringing in a gas drop to an unused up
stairs closet that we want to turn into a second laundry room.
There is a gas line that runs in the wall in the very closet where
the new laundry room is to be located. What is the best way to tap
into the existing gas line?
I can get a pipe cutter on it to cut the pipe and thread it, but I
can't think of any fitting that I could use to make up the new
connection except a union and as I recall, unions are not allowed to
be concealed inside walls.
TIA - Pete
Don't conceal it! Take out a nice chunk of drywall around
the location, paint the inside of the cavity and trim it
out with molding (something like a chair rail) if you want
to get really anal about it, but (assuming this isn't a
gigantic closet) it's likely to be partially or totally
buried behind the dryer, no?
Baisez-les s'ils ne peuvent pas prendre une plaisanterie
I'd never use any other type of union for gas in pipe. You can buy them
from every plumbing fitting manufacturer that I know of. The two mating
surfaces of the union are ground to one another to ensure a gas tight
fit. The two halves should be kept as a pair and not interchanged with
those from other ground unions. This is the easiest way to join two
pipes in the situation described. Some jurisdictions will permit it,
others will require the use of male and female threaded nipples and
couplings. The use of male and female thread nipples is a more
difficult solution if not required.
I don't have a copy of the UPC handy but I believe that the use of
ground unions is addressed in it in section 1210 or near there. They
only permit it in specific locations though.
The problem with that is that there are also unions that are not ground.
When I'm specifying a design I try to be specific. My E&O insurance
carrier prefers it that way. So do I, as fewer mistakes are made by the
trades that may not recognize the difference, even though there is one.
: Our home has all of the gas pipe run in black pipe with threaded
: connection. We are in need of bringing in a gas drop to an unused up
: stairs closet that we want to turn into a second laundry room.
: There is a gas line that runs in the wall in the very closet where
: the new laundry room is to be located. What is the best way to tap
: into the existing gas line?
: I can get a pipe cutter on it to cut the pipe and thread it, but I
: can't think of any fitting that I could use to make up the new
: connection except a union and as I recall, unions are not allowed to
: be concealed inside walls.
: Any suggestions?
We had to re-route a gasline to accommodate a skylight shaft. The problem
with simply cutting into the existing pipe is reconnecting the two back
together. A special union was used that had reversed threads at one end so
that tightening one end would not loosen the other...
Please correct me if I'm wrong.
Our method left the union exposed in the attic, this may still be a code
Computer recommends - Hard drinking calypso poet
A union in the attic area is not a code violation and in some
jurisdictions you can put a union in an enclosed wall if you center
punch the union to prevent it from vibrating loose and some
jurisdictions may not even require that. I would recommend not putting
any connections inside a wall....or if you must do so find a way to
use as few fittings as possible. Normally the main piping will be in
an attic or crawlspace, if coming from the attic inside a wall you
will normally just have an elbow to turn out to the appliance, when
coming from beneath the floor I always stubbed up in the room and not
in the wall as the appliance will conceal the piping.
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