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

EDR of straight pipe?

DsissonDsisson Member Posts: 55
I have "The Lost Art of Steam Heating". I remember reading in it *somewhere* that one can use uninsulated pipe as a sort of a radiator for small spaces. I also seem to recall that it had a table that listed the EDR of different pipe sizes per foot. But for the life of me I can't find it in the book and I even wonder if I was imagining it. Can anyone point me in the right direction for a table that lists the per foot EDR for black pipe?


  • Jamie HallJamie Hall Member Posts: 13,418
    Why bother with a table? A few seconds with your tape measure and a friendly calculator will give it to you. Measure the circumference of the pipe in inches. Multiply that by 12 (the number of inches in a foot) and divide by 144 (square inches per square foot) and there you are. The EDR of a foot of your pipe.
    Br. Jamie, osb

    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.

    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • DsissonDsisson Member Posts: 55
    edited October 12
    Thank you - as I understand it:

    EDR of steel sched. 40 pipe (example)

    pipe size = 1"

    diameter = 1.315"

    EDR per foot = 0.344

  • EBEBRATT-EdEBEBRATT-Ed Member Posts: 7,316
    yes. 3,14 (pie) x 1.315 (diameter) = 4.129 x 12"=49.5492

  • ted_pted_p Member Posts: 63
    edited October 13
    Here's one:

    And Here's the link:
    Carbon Steel, ANSI Schedule 40 (in) Datasheet

    Use the numbers in the "External Surface Area" column.
Sign In or Register to comment.


It looks like you're new here. If you want to get involved, click one of these buttons!