I have to run a gas pipe for a new gas fireplace. In the house the
pipe is 1 inch from the meter for about 20 feet and then ¾ about ten
feet to the heater, water, heater and another 15 feet to a dryer. The
gas fireplace is about 25 feet from the heater. Is it ok to run ¾ inch
pipe to that unit or is there some point where I need to go down to ½
inch. Is cost the only reason why they down sized to ¾ from 1 inch. I
could see that there might be a problem using the ½ inch not being
able to supply the volume of gas but ¾ shouldn't be a problem,
Sort of, maybe. Depends on the usage of the appliance and what else is on
that line. While I'd guess you are OK, it is only a guess. You have to
know the input requirements of everything on the line and what the capacity
of the meter/line is.
Then we can get into length of run, number of elbows, etc. What would I do?
I'd run the 3/4" line and then crank up all the appliances and see if I had
adequate supply. There is no "need" to go down to 1/2" at any point.
When I did my gas line, I ran 1 inch to the first usage, and then dropped to
3/4. All of my drops which were less than 3 feet were done in Half inch. I
dropped 3/4 to the dryer ( farthest from meter ) and bought an 3/4 to 1/2
street elbow and connected the dryer that way. My heater was the largest
load at 100k btu. Fortunately for me it was the first load served. I would
used black iron instead of galvanized pipe. Less problems clogging the pilot
lites. I would definitely run 3/4 to the fireplace. The drop to half inch
when you get to it.
Thanks guy a couple of other questions.
I have four things connected to gas but the run only one has a clean
out. Not at the end of the run not at the beginning, right in the
middle but it is the lowest point. Is this enough? Should I put
another at the end of my run? How often should you clean this out?
Funny too, the clean out is up and over a beam which would make me
think stuff can get trapped in the main line. What stuff are we
talking about water I guess correct?
Also is there a problem running gas pipe from a warm area like a
basement to a cold garage for a heater? Would this cause extra
condensation? Should I put a cleanout there just in case there is
I was taught that every time you go vertical instead of using an El
you should use a Tee with at least a two inch capped stub.
My house has gas to every room (including bedrooms for lighting)
dating from the early 1900's and the pipes all seem to follow this
rule. In addition at the lowest point in the cellar there's a three
foot stub terminating in the sort of gas valve they used in schools
for the Bunsen burners (you push the rubber tubing over the nipple).
Maybe this was some sort of pressure release/drain point. When I open
it no water comes out though. Just gas.
AFAIK you don't. If you needed to drain it one would think that the
stubs would all be terminated in a valve so that you don't have to get
out the old pipe wrenches.
Yes. But it could be one of those things that has just been held over
from the era of coal gas.
This is Turtle.
Here is a pipe chart for sizing the pipe size verses the BTU needed for a
appliance and you can calculate all your needs as to what size pipe to get and
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