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Old apartment radiator spitting water

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Building built in 1921. A large complex. Main radiator is spitting so much water that it’s ruining my walls. Brooklyn apartment so the land lord is non responsive. All other radiators are fine. Wondering if I can fix this myself

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  • JohnNY
    JohnNY Member Posts: 3,244
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    Is the shut off valve all the way open? It should be. The radiator's got to be able to drain.
    Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
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  • nicholas bonham-carter
    nicholas bonham-carter Member Posts: 8,578
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    Agree with JohnNY that the inlet valve should be completely open.
    The presence of a thermostatic vent leads me to believe that the radiator was over heating at some point, probably due to overpressure. Are the other radiators so equipped as well?—NBC
  • question
    question Member Posts: 30
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    If the shut off is open all the way try putting some shims under the legs to have it drain better.
  • Jamie Hall
    Jamie Hall Member Posts: 23,675
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    Is it the radiator valve (where the steam pipe comes in) or the radiator vent (shown enlarged in one of your pictures)? If it's the vent, you can also try a slower vent -- assuming the room heats OK with what you have now -- which can help sometimes. Particularly if the boiler pressure is too high -- which it probably is.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • ChrisJ
    ChrisJ Member Posts: 15,929
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    Wow guys, way to respond to a post 8 months too late. :p

    Wonder what ever happened with @rude_burrito
    Single pipe quasi-vapor system. Typical operating pressure 0.14 - 0.43 oz. EcoSteam ES-20 Advanced Control for Residential Steam boilers. Rectorseal Steamaster water treatment