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EDR of Steam Mains

Ban
Ban Member Posts: 79
We are trying to figure the total EDR of our building and are having difficulty with figuring out the main on this particular system. We calculated the EDR of our radiators to be 1146 sq ft. If the pick up is .333% for the mains, that would leave us with 378 sq ft.



The system is a one-pipe with a 4" main and we have evidence that it used to be on a district steam system. The main is run in a near full-circle around the building to the boiler, as seen in the photographs below. Half of the main is a counter-flow and the other half a parallel-flow. We are concerned that the main might be so large that we need to account for more then .333% so we are trying to determine the proper EDR for mains. We cannot find any solid information on how to determine this. The entire loop of the main is currently insulated with 1" fiberglass and is approx. 125' long.



Advice is appreciated.
Richard Ban
Detroit, Michigan (Dunham 2-pipe vacuum)

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