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Old 01-17-2011, 01:52 AM   #1
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Questions about underground gas line


We recently had a gas line repaired where it entered the ground. There was moisture in the soil and it had caused the galvanized pipe to corrode where it entered the surface.
My questions are:
1) Why would anyone run a gas line under the ground and
2) Should I replace this underground line with one that runs above the surface?

Thanks

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Old 01-17-2011, 08:57 PM   #2
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Questions about underground gas line


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Originally Posted by darsunt View Post
We recently had a gas line repaired where it entered the ground. There was moisture in the soil and it had caused the galvanized pipe to corrode where it entered the surface.
My questions are:
1) Why would anyone run a gas line under the ground and
2) Should I replace this underground line with one that runs above the surface?

Thanks

You do not want to run a gas line above the surface. All around you there are gas lines underground. How do you think your utility company gets the gas into the meter? But at the same time, you can't use galvanized or black iron pipe underground b/c of the corrosion issue. Instead, if your code allows, use copper. I would consult with a code official or licensed plumber about this issue.

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Old 01-17-2011, 11:32 PM   #3
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Questions about underground gas line


We had a plumber do the fix, obviously he thinks galvanized is fine.
I'm just wondering if the comments I've read had weight, if there is anything better than galvanized for gas pipes in the home.
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Old 01-18-2011, 01:12 AM   #4
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Questions about underground gas line


Yes there is something better, it is a coated black iron pipe. It is coated with a green plastic that will protect the inner pipe from corrosion.
Any fittings are then covered with a plastic mil tape to protect them. All in all the system is not much more expensive than regular black iron pipe and lasts longer underground.

Andy.
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Old 01-18-2011, 08:12 AM   #5
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Questions about underground gas line


This is all I use for under ground gas lines


http://www.wal-rich.com/YellowPolypipe.pdf
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Old 01-18-2011, 08:28 AM   #6
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Questions about underground gas line


The gas company recently re-did all the lines in our neighborhood. The yellow plastic is what they used.
I believe it was polyethelene similar to the PEX used for water supply lines.
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Old 01-20-2011, 06:03 PM   #7
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Questions about underground gas line


But above ground galvanized is fine? I've read somewhere that when the pipe is cut a lot of particulate steel can get in the pipe, potentially clogging gas valves. Is this a concern? A plumber offered to run new galvanized lines above ground, he did not seemed to be concerned about clogging gas lines.
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Old 01-20-2011, 06:25 PM   #8
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Questions about underground gas line


I am not sure where you are from, but Canadian gas code does not allow galvanized piping to be used on gas, probably for the same reason you speak of about plugging gas valves and orifices. The galvanized piping is coated with zinc which can have small particles flake off.
Kenmac knows what he is talking about, use the plastic.

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