Propane line in conduit?

noworriesMay 29, 2009

My contractor buried a schedule 40 conduit 18" deep under the gravel bed underlying what will be a flagstone patio. His idea is that the propane company will fish the propane line through the conduit. The propane line is for a fire pit. I'm traveling, but presume he thinks the required tracer tape will be fished along with the propane line.

Is this in any way legal? If so, how would one make the conduit ends weather-tight?

I'm inclined to make him dig it up and put a gas line in and leave the conduit for what it was designed, power. No, I'm not planning to pull both gas and power in the same conduit.

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Buried conduit is always considered a wet location. But if the conduit is simply to fish gas tubing through, it's probably legit, though I'd be concerned with galvanic reaction if the conduit is anything but plastic or the same material as the gas line.
If he has used the conduit intended for power, then you'll need another conduit.
One always defers to AHJ, but around here, soft copper is OK for underground hookup with LPG.
Personally, I would never put steel in the ground, even if allowed.

    Bookmark   May 29, 2009 at 12:21PM
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No only is it legal, code requires that when running any line under a concrete slab the line is required to be sleeved.

To make the required sleeve you first install a pipe that is at least two nominal trade sizes larger than the desired pipe, then run the desired pipe through the sleeve.

    Bookmark   May 29, 2009 at 12:37PM
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Well, I called the source, my propane co.

1. They can run flex plastic gas line inside a PVC sleeve.
2. The sleeve needs to be daylighted at each end so that they can attach steel sweeps to the plastic gas line. (There must be a certain depth of steel line below grade).
3. There then must be pvc sleeving slid down over the steel line where it might otherwise contact concrete.

I'm going to dig out each end of the conduit and cut off the sweeps the contractor installed. The propane co will then be ready to go on Monday.

    Bookmark   May 29, 2009 at 12:50PM
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