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Thread: Gas Meter - Outlet Pipe Size Change

  1. #1

    Default Gas Meter - Outlet Pipe Size Change

    Adding new furnace (3rd) and will be bumping up to the code natural gas deliver rate for my 1" gas line and distance from meter. Do I need to get new meter to increase gas line from meter to 1.25" which will give me the higher gas delivery rates? Looking at meter it would seem I just need to chnage the size of the connectors to acomadate the large piping.

  2. #2
    In the Trades Gary Swart's Avatar
    Join Date
    Sep 2004
    Yakima WA


    I would hope you're not trying the DIY this job. Many places to err and disasterious results possible. The installer should know the answer to this, and the gas company will have the meter size information. I believe it is the gas company's responsibility to install the meter anyway. If you are just trying to determine what the install will have to do in the way of sizing, the gas company will probably be able to provide this information.

  3. #3
    Moderator & Master Plumber hj's Avatar
    Join Date
    Aug 2004
    Cave Creek, Arizona

    Default meter

    The only thing about the meter that affects your installation is its cfm capacity. As long as that is large enough, you can use any size pipe after it as long as it is sized according to the load and distance.

  4. #4


    What is the math to figure out what size piping is needed when adding extra fixtures?

  5. #5
    Master Plumber-Gas Fitter shacko's Avatar
    Join Date
    Jan 2006
    Rosedale, Md

    Default Gas pipe

    I think you are getting in over your head. You need to know what the BTU rating is from your supplier through the meter, you need to know what is connected inside the dwelling, you need to know what the cubic foot rating is per local suppliers, This is just part of the math, Sorry.

  6. #6
    Plumber jimbo's Avatar
    Join Date
    Aug 2004
    San Diego


    The charts are available in the National Fuel Gas Code Book. The questions you ask are a little beyond DIY. All of the gas loads need to be taken into consideration to determine the CFM required through each leg of the piping system.

    Now, is any harm done by just upping the main run by one pipe size? No.
    Many places, like here in San Diego, will allow you as the homeowner to pull a permit for gas work. You will need to know the codes and your work must be up to standard. The inspector will be taking a pretty close look. You do not want to be the feature story on the 11:00 oclock news!


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