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Gas pipe sizing

Does anyone know where I can find a chart for sizing gas piping for a 500 foot run? The chart I currently use only goes up to 200 feet.

I am trying to size a gas line to a 1,750,000 btu water heater, and the line must run approximately 475 feet from the meter on the other side of the building.

If anyone knows where I can find this info, I would appreciate it.


  • jackchips_2
    jackchips_2 Member Posts: 1,338
    Hi Robert,

    I did a quick Google and came up with the following:


    My Boston Gas wheel shows you require a 4" line for that capacity and length based on a low pressure system (14" or under).

    Hope this helps.

  • Jim M_2
    Jim M_2 Member Posts: 1

    NFPA -54 National gas fuel code.
    4" pipe is good for 500' at 2,109,000 btu
    at 1psi or less.

    your BTU needs and distance require 4" Pipe

    check with the local supplier of gas for the pressures and specifiv gravity of the gas in you area. then refer to the NFPA Gas Fuel code.

    good luck,
  • Weezbo
    Weezbo Member Posts: 6,232
    the utility provider,...

    often has salient information as to the BTU the gas they have available,main sizing,pressure available...minor technicalities as it is that might need to be taken into consideration...
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