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Can I use 1" black pipe for a 10' runout (couterflow) supplying 1 small radiator?

stormbytes
stormbytes Member Posts: 36
in Plumbing

Need to run several short branches to individual rads on the 1FL. Runouts will have good pitch and span < 10' before a swing joint and short riser. Want to confirm I can use 1" diameter black pipe for these short runs. Rads are all < 25 EDR. Book says I'm good for up to 28 EDR.

Comments

  • mattmia2
    mattmia2 Member Posts: 14,606
    edited October 14

    Probably want to insulate it but it should be good. Might need more vent on the radiator. the smaller pipe will heat faster and have less air to vent.

    stormbytes
  • Jamie Hall
    Jamie Hall Member Posts: 26,515

    Good pitch will be critical. Don't skimp.

    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
    mattmia2stormbytes
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 18,830

    Your right on the border line. Should go to 1 1/4" to be sure but if you can get plenty of pitch your probably ok.

    Keep the 90s to a minimum. 45s are better. Make sure the tees coming off the mains are on a 45 to the branch.

  • ChrisJ
    ChrisJ Member Posts: 16,965

    All of the horizontal runouts in my house are 1 1/4", even a tiny 16sqft radiator.

    Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

  • stormbytes
    stormbytes Member Posts: 36
    https://forum.heatinghelp.com/discussion/comment/1867852#Comment_1867852

    Yep, runouts will insulated. The plan is to vent each branch through a tee at the top of the riser.

  • stormbytes
    stormbytes Member Posts: 36
    https://forum.heatinghelp.com/discussion/comment/1867870#Comment_1867870

    Same here, but then you see all the crap work they did and you wonder if that was actually based on thought or convention. I'll use 1-1/4" if I need to, but if 1" will do the job, i see no reason to pay for and lift heavier pipe than is necessary. I'm still weighing this out.

  • ChrisJ
    ChrisJ Member Posts: 16,965
    https://forum.heatinghelp.com/discussion/comment/1867877#Comment_1867877

    Not sure.

    Also a chance all they had in my case was 2x2x1.25" tees.

    Single pipe 392sqft system with an EG-40 rated for 325sqft and it's silent and balanced at all times.

    stormbytes
  • pecmsg
    pecmsg Member Posts: 6,581

    why take the chance and have to redo it.

    1 1/4” minimum

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