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1 and 2 pipe steam

Todd_27 Member Posts: 21
Yesterday we were looking at a job that was basiclly all 1 pipe steam. There were a couple small rooms on the outer perimeter that were hooked up as two pipe though.
One area had a steam trap, its return was tied in above the water line on the return. The other had two pipe with no trap, but looked like the return came back below the water line in the wet return. Due to the uneven floors and ceinings, it was difficult to determine if these were indeed tied in below the return waterline, but it seemed that it was.
What is the purpose to mix these? (why some two pipe vs one on same system)


  • Steamhead (in transit)
    Steamhead (in transit) Member Posts: 6,688
    Those were probably additions

    where they might not have been able to make one-pipe work properly.

    The steam trap is wrong for that type of job. It will let air approach that radiator from two directions- the return as well as the supply. Use a water seal in the radiator return if you can't hook it up to the wet return below the waterline- make the seal 3 feet deep or so.

    The second radiator is piped correctly assuming the return connects below the waterline.


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