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Steam Heating Distribution from the 1930's
I'm currently trying to dissect a steam heating system built in the 1930's in NYC. Mostly I want to know if this is a two-pipe or a one pipe system.
90% of the building has vertical radiators in the apartments without steam traps and the lower floors contain some radiators with steam traps and some with air vents. It's all very confusing and counter-intuitive to what I know. It seems like there were a lot of hands in here changing things from the original design.
After doing some searching online and on this wonderful site, I stumbled on the "Mill's System" which is a one-pipe down-feed steam system. I suspect it could be some variation of this, but there are no air vents or steam traps on 90% of the radiators.
Also, there is a vacuum pump on the return, so I'm thinking it can't be a one-pipe.
Any thoughts? Thanks!