Replacing bad gas line (black iron)

Old 10-06-06, 11:44 AM
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Replacing bad gas line (black iron)

Hi everyone,

I知 trying to figure the best way to go. We have a propane stove and it is the only utility on gas, everything else is electric. The black pipe under the house developed a leak. The house is raised three foot.

There is a three foot piece of black pipe that travels downward from under the house to a six foot piece of black pipe underground. The six foot piece makes a run to about three feet out from under the house where then joins to copper tubing which then goes to the tank -about 25 ft. away.

The six foot piece has an elongated hole in it and it is only about six years old. The gas company/supplier suggested running copper tubing under the house flooring to the end of the house (about 25 ft.) and then into the ground and to the tank - bypassing all the old underground piping. They can do the full job or I can run the tubing and they come back and make the connections and hook-up. Now a friend/handyman wants to just replace the 3 ft. and 6 ft. pieces of black pipe.

I am concern about what caused the leak in the first place. It was awful wet in the ground where the pipe was leaking and there is a rod of some sort extending from one of the pier footings the may have in contact with black iron pipe and cuased the corrosion of the pipe. The friend says putting the black pipe in some pvc pipe that we have (2 pieces to make almost a length of 6 ft.) would act as kind of a sheathing.

So, what to do? Would there be any negatives of just running the copper tubing, bypassing all the other piping that was underground? It would just tie into the black iron pipe leading into the floor. Or, what about replacing the black iron pipe with new? I知 concerned as to whether the pvc ( 1セ inch ) is sufficient or is ok to use.

Thanks for your time.
Old 10-06-06, 01:31 PM
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Black Iron gas pipe should not be installed in wet locations because of corrosion and rust. Bypass the pipe as the gas company recommended and install copper. If at all within your budget, I would have them do the install.
Old 10-06-06, 02:19 PM
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As already stated, black iron pipe is not good in wet locations. Additionally, it's not good to use underground unless it's wrapped.

I would take the recommendation of the gas company. Even unprotected copper tubing can give way buried, so be safe and replace it. National Fuel Code doesn't allow bare copper tubing underground although local authority having jurisdiction has final say. National Fuel Code required coated copper tubing.

Again, as stated, should you have the funds, let your gas company do it as it will be done the way they want and done to code. If they told you the proper material to use, you running it and having them make the connections is ok too. There are too many type of connections that can be used but some are not suitable for gas.

Regardless of what you chose to do, at a minimum, have the gas company check out the work that was done so they can write off on it. This way, for your sake, it spreads the liability should something happen.

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