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No Steam at 2-pipe radiators in 1920's School Building 3rd Floor
We have a 1920's school building with pipes in the walls feeding wall ventilators and radiation. No prints.
It's a two pipe system. I'm looking for some possibilities to look for in diagnosing the problem of no steam at the control valves. The third floor of the building has three radiators against the wall fed vertically by separate lines. One of the radiators works the other two do not. The two that do not have steam are cold up and down stream of the control valve at the radiator. We have not been able to trace any of the lines as of yet.
1. My first thought is that the traps may not be passing air to allow the steam to rise through the pipe.
Question: If air is not being released is it possible to still have cold pipes at the radiator? Will some steam rise up the vertical pipes?
2. I also read that cracking union to see if air is released and steam starts flowing would be a good indication that the traps need repair or replacement.
2. A valve could also be shut on the riser in the basement. We'll need to trace the risers in a large building.
Any confirmation or help in heading me in the right direction would be appreciated.