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Outdoor gas line question

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  • Outdoor gas line question

    Is it possible to go from a 1/2? rigid pipe to 3/4? PE gas line?
    Basically we are adding a fire pit, gas BBQ and fireplace with gas log starter. Tapping into the meter will require too much demo to get it where it needs to be. There is an indoor fireplace that is closer too where we need the gas branches to be. We plan on tapping into the indoor gas log igniter but that is 1/2?. Gas line comes in from roof.
    Can it be done? Are there any options?
    Appreciate any help.
    Thanks in advance.

  • #2
    Gas pipe sizing.is based on total demand and total developed length. So it's impossible to determine without the complete gas system isometric showing the btu's demand and distances..

    Rick.
    phoebe it is

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    • #3
      Yes it may be possible but you will need an exact layout of the existing piping including bends etc as well as the layout of the new proposed gas line to the firepit. You will need to perform gas flow calculations to see if at full capacity of the firepit and fireplace, the gas pressure at both appliances will not drop below the specified minimum. The total pressure drop across the piping will be based on the flow rate and total effective length. So the static pressure at the gas meter - pressure drop through the piping should not drop below the min gas pressure at both fireplace and firepit.

      So you will need to do further research and some calcs to see if it is feasible or not.

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      • #4
        Also don't forget your local codes for the project.
        In some states you must use a licensed plumber with a gas fitting certification and even
        a building permit is required for your project.

        If you don't do it properly, when your house burns down your homeowner's insurance will
        not cover your loss!!!

        Gas piping is not a DIY project..do it correctly and do it safely!

        Cactus Man

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        • #5
          You have a 1/2" line going to a fireplace and you plan to add a fire pit, bbq and a log lighter. Your half inch line cannot handle such a load. Running a new line from the meter will probably be necessary. If it "require too much demo to get it where it needs to be", that's the price to pay when doing a job the proper way.

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