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EDR Equivalent for steel pipe with fins

Brian_56 Member Posts: 7
I have approximately 60' of 4" steel pipe with a spiral fin attached to it. Does anyone know what the EDR would be for this? I have attached a few pictures.



  • Jamie Hall
    Jamie Hall Member Posts: 23,275
    good grief

    where did that come from?

    Lower math: measure the diameter of the fins, figure the area of one fin (3.14 times the square of the diameter, divided by 4). Subtract the cross section area of the pipe (4" pipe is about 12 square inches). Count the number of fins per foot, multiply by the area you got by the subtraction and multiply by 2. That's the number of square inches of radiation per foot of pipe. Multiply by the feet of pipe and divide by 144; that will give you a sort of approximation to the effective radiating area and thus the EDR.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Brian_56
    Brian_56 Member Posts: 7
    Thanks for your help

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