EDR Equivalent for steel pipe with fins

Brian_56

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.

Thanks

Jamie Hall

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.

Brian_56

Thanks for your help