Welcome! Here are the website rules, as well as some tips for using this forum.
Need to contact us? Visit https://heatinghelp.com/contact-us/.
Click here to Find a Contractor in your area.

Size of gas piping for 280000 BTU hot water boiler

Empire_2
Empire_2 Member Posts: 2,340
in THE MAIN WALL
1"NPT black pipe , @ .3 pressure loss in " w.c./ Even @ .5 which I actually size for you can fire 300M to 50foot. Additionally this applies as long as there is nothing else off that branch run.

Comments

  • Joshua Hosseinof
    Joshua Hosseinof Member Posts: 8


    What would be the proper size of natural gas piping for about a 30 foot run from the meter to a natural gas fired hot water boiler that is 280000 btu's?
  • CHARLES_4
    CHARLES_4 Member Posts: 61
    PIPE SIZE

    1 1/4" pipe will carry 495,000 Btus. 1" is only good for 15ft.
  • jackchips_2
    jackchips_2 Member Posts: 1,337
    I come up

    with 1" pipe which will do approximately 325,000 BTU's at .3 pressure drop and 30 foot developed length.



    Jack
  • Brad White_9
    Brad White_9 Member Posts: 2,440
    Gas Pipe Size Basis

    All responses are correct but take note of what Jack Chips says: "Developed length". Sure it is only 30 feet but elbows and tees do add up; it may be 50 feet developed.. No harm in going up a size if you are not sure, just a cost issue at most.

    Also you are sizing for a total pressure drop, meter to point of use. Generally (at least here in Boston) 0.30 inches total pressure drop is recommended.
  • CHARLES_4
    CHARLES_4 Member Posts: 61
    PIPE SIZE

    My pipe must be running uphill...
  • Tony Conner_2
    Tony Conner_2 Member Posts: 443
    For...

    ...compressible fluids like steam, compressed air, natural gas etc, elevation change doesn't matter. It only matters with liquids.
  • jackchips_2
    jackchips_2 Member Posts: 1,337
    Brad,

    has Boston Gas (whoever they are now)changed from .2?

    TIA,

    Jack
  • jackchips_2
    jackchips_2 Member Posts: 1,337
    LOL,

    Charles. :-))
  • Brad White_9
    Brad White_9 Member Posts: 2,440
    I think you are right, Jack

    I think it is 0.20. When you only get 4 inches to play with

    (DO NOT go there, Jack!)

    you need all the pressure you can get.... :)

    Brad
  • Empire_2
    Empire_2 Member Posts: 2,340
    Just a thought...

    In NY the rec. pressure loss is .3, having said that such a short run even with 15 elbows @ 1" pipe you see little if any drop at .3 since it more about volume in that particular short run. Can that pipe carry the volume needed..? Yes. Don't forget that the line pressure in "W.C.supplying the fuel device is usually between 4.0 to 7.0"wc depending on the manufacturer. With such a short run I feel I can actually be safe loosing .5 pressure loss with no adverse effects.

    Just my thoughts, always willing to learn new things.:)
This discussion has been closed.

Categories