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Odd combined single pipe in a 2 pipe system

There is one steam feed in my basement that has a T with a return to my wet return below the steam feed to a radiator. Is this common? Is this OK? I have not been able to identify a specific radiator it feeds, so could it have a different purpose?
Homeowner with new (12/2012) Dunkirk PSB-7D steam system with 726 sq.ft. EDR in a home built in 1925.


  • JStarJStar Posts: 2,668

    Could just be a riser drip to compensate for the inability to properly pitch the run out. Shouldn't be an issue.
    - Joe Starosielec
    [email protected]
  • SteamheadSteamhead Posts: 11,159

    there is an air vent up there, which was hidden when the ceiling was installed?
    All Steamed Up, Inc.
    "Reducing our country's energy consumption, one system at a time"
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Baltimore, MD (USA) and consulting anywhere.
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