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 Direct Burial Nat Gas Piping
Author: Anonymous User

I'm installing a new natural gas fueled standby generator (12Kw) about 70 feet from the house. At full load it will consume about 220 cu/ft/hr of gas, and I have determined that I need to supply it with 1" gas line (100 foot run) to keep it happy.

So I need to bury about 65 feet of 1" gas line, and I am looking for suggestions on the least expensive material to use for the buried section of line while still conforming to code and good practice. (OK, If you want to suggest good practice and stretch the code, I'll listen).

We have low pressure gas here in rural NE Illinois, and I have no doubt that sched 40 PVC would do the job, but I don't see that any plastic pipe but ASTM D2513 has been accepted for this application, and it smells like pretty expensive stuff to me.

I was a pipefitter in a past life, so you can use big words. Thanks in advance.

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 Re: Direct Burial Nat Gas Piping
Author: Anonymous User

Than you must of died from an explosion if you used sch40 pvc in you past life!!!!!, get a Licenced Plumber

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 Re: Direct Burial Nat Gas Piping
Author: Anonymous User

So, in your learned opinion, 7 psi is likely to burst sched 40 PVC? Thanks for the advice.

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 Re: Direct Burial Nat Gas Piping
Author: Dunbar (KY)

Run 1" PE piping.


It is yellow in color, run a #10 tracer wire along with it, tape the wire every 4 feet.


Turn up a Normac riser (Meter kit) at either end (if need be) where the pipe must come up through the grade and capable of being damaged.


Have the gas line inspected, and run a straight line when you do it from point A to point B.

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 Re: Direct Burial Nat Gas Piping
Author: Anonymous User

Thanks Dunbar! Checked some prices. Looks like I might stay under $200 for the underground section, and that includes 2 meter kits with brackets.

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 Re: Direct Burial Nat Gas Piping
Author: hj

How about little words. PVC is no longer approved for gas piping. The only thing I would use underground is polyethylene with "compression" fittings and the approved transition risers.

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 Re: Direct Burial Nat Gas Piping
Author: hj

No, but at one time they made yellow PVC for use with natural gas. They do not make it any more.

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 Re: Direct Burial Nat Gas Piping
Author: hj

I hope you mean 7" pressure. 7 psi is well above most high pressure ratings.

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 Re: Direct Burial Nat Gas Piping
Author: hj

The only fly in the ointment is that you are not supposed to be able to purchase the pipe or fittings without a certification license.

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 Re: Direct Burial Nat Gas Piping
Author: Anonymous User

holy cow! since when is low pressure gas 7psi? Up here standard gas pressure is 7-14 inches of w.c. which is a little more than 1/2lb psi!

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