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# EDR of straight pipe?

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Member Posts: 92
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?

• Member Posts: 23,286
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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
• Member Posts: 92
edited October 2020
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Thank you - as I understand it:

EDR of steel sched. 40 pipe (example)

pipe size = 1"

diameter = 1.315"

EDR per foot = 0.344

correct?
• Member Posts: 15,524
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yes. 3,14 (pie) x 1.315 (diameter) = 4.129 x 12"=49.5492

49.5492/144=.344
• Member Posts: 65
edited October 2020
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Here's one: