How can I replace an elbow in the middle of a gas line?

I cannot loosen a section in the middle of the line without twisting the rest of the line downstream. Do I have to redo the line from the elbow on or is there some easier way?

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  1. rangedog, 01 May, 2010

    Most codes restrict the use of unions in gas lines. You can usually use them in exposed areas. There are other restrictions also.

    I’m a licensed gasfitter, and to be honest with you, you have no business doing your own gas work unless a very well experienced person is guiding you. Someone that can legally do it for you actually is better.
    Some areas require the system to not be opened without a pressure test to follow.

    Besides, we need more info. Is the line you are working on underground, exposed, in a wall, or attic?

  2. Newf, 01 May, 2010

    If your tryin to loosen one end it will want to tighten the other side. Find a place to break the connection. This will make it easier to work with.If there is no place to break the connection, than most likely you will have to remove everything and redo it all.

    For the sake of God do not use a hacksaw. Oh lets see gas and sparks. HMMM! Do Not do this. I work in a gas plant and i know that this is not a safe way to do it. So dont.

  3. T.J., 01 May, 2010

    You have to cut the straight piece near the elbow with a hacksaw. Remove the elbow and straight section. Then install the new elbow and install an new straight section with a union fitting in the middle. The union will allow you to tighten the connections in both directions.

  4. Darius W, 01 May, 2010

    the easiest way is to cut off the gas from the cutoff valve and get a hot wet towel place it over the line and twist it off with the biggest rench you have and twist it off

  5. GFC, 01 May, 2010

    SOMEwhere in the line there is almost certainly a union — a coupler that allows what you’re trying to do. Especially if the line goes to a furnace, water heater or other similar appliance. Turn off the gas, bleed line safely if possible, disconnect at union, remove pipe back to the elbow needing replacement. Replace elbow and all the pipe you removed before. Reconnect the union. Check for leaks. Turn on gas. Check for leaks. Check for leaks one more time. Have a beer, then check for leaks again.

    Good luck.

  6. Example Husband, 01 May, 2010

    When working on a gas line there are several things to be aware of. The condition of the line, is it rusted bad, is it securely fastened in place? Where are the shutoff valves, are they in good condition and are there any unions? Unions are places in the line where the line can be taken apart. It is almost impossible to install a gas line without unions. Find the nearest union to the fitting you want to change, with two good pipe wrenches, take the line apart all the way from the nearest union to the bad fitting. When you put the line back, be sure to use lots of thread sealing compound (pipe dope) If there isn’t any unions you will have to cut the line twice and install two unions. You will also have to thread the pipe where you cut it at. The tool to do this job is a very expensive one, you may consider calling a professional. Its not a hard task, just need the tool. Be sure to turn off the gas and bleed the lines before you cut the gas line.

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