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steam radiator replacement, supply pipe sizing
where can I get a chart to tell me the edr or btu/hr for 1/2 through 1" supply piping, to individual steam radiators? basicaly 1 to 5 psig.
I am on a job, where I need to replace more than a dozen fin tube steam radiators with steamview steel radiators. the fin tube radiators are 4 row, single element, tubes look to be 1/2" or 5/8 diameter. I was not able to locate a sizing chart for steam fin tubes this small.
In some instances, I am removing a 2' fin tube element, and installinf a 6' steel radiator. The piping to and from the exsiting radiators are 1/2".
some of the 2nd floor radiators are 3/4" and 1" supply, but they all utilize 1/2" returns. these are the 3' and 4' fin tube radiator elements.
by the way, this is a 2 pipe, condensate pumped return system, not a vacuum system, which they run at 5 psi. all of the radiators are individually piped from the basement, where 4 supplys and or 4 returns horizontally branch off of the main lines, then tee off all before they climb the walls.
so, I calculated a 6' steel radiator (10,659 btuh) at 44.41 edr. I found on engineers tool box, 1/2" pipe at 5 psi will provide 48 edr @ 50 ft/sec. I think I am safe to reuse these 1/2" supplys, as I am just swinging the exising piping over a foot or two horizontally in the wall to catch my new rough-in penetrations.
any opinions in the matter?