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On 18 Dec 2004 13:46:12 -0800, wrote:
I'm toying with the idea of running a buried natural gas line out to
the garage for a hot air furnace as well as my foundry furnace (now
propane)
I'de have to cover about 25 feet from the basement to the detached
garage.
What are my options for piping? I recall hearing about a direct burial
stainless product, but cant seem to find any info on it for a DIY
installation.
I relaize cast iron is not suitable for direct burial, but is is OK
within a counduit of some sort?
I'de prefer something flexible for easy of installation, but will
gladly make do with whatever works best.
Vin
Been there, and have taken the SoCal Gas Appliance Clinic classes...
You need to use the special poly pipe made for buried Natural Gas
service, with the swaged on steel "yard ell" fittings where it comes
above ground - if you measure the route you may be able to get one
pre-assembled, just drop it in the trench and backfill. (Have seen it
done that way for pool heaters.)
That, or the green ScotchKote plastic coated Black Steel pipe, and
tape all the splices and ends with the thick 20-mil corrosion
protection tape.
Either way the line needs to be sized very large, because your
natural gas to the house is less than 1 PSI and flow restriction is a
big problem. Look up the BTUH flow you need in the garage for the
footage of pipe (and each elbow in the line adds another 5' to 10' of
resistance IIRC) and then go the next size (or two) larger. Pipe is
cheap, the labor to redo it again later is expensive.
Don't tap into the existing gas lines under the house, that will put
too much flow through them. Take the new line all the way back to the
gas meter so you can have a separate shutoff valve there, and then
connect the 1" line to the house and the 1-1/2" line to the garage
into one 2" manifold for the meter.
Call the Gas Company when you finish, they will probably need to
install a larger gas meter to provide enough flow.
-- Bruce --
--
Bruce L. Bergman, Woodland Hills (Los Angeles) CA - Desktop
Electrician for Westend Electric - CA726700
5737 Kanan Rd. #359, Agoura CA 91301 (818) 889-9545
Spamtrapped address: Remove the python and the invalid, and use a net.
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