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How to test a Radiator Steam Trap

Dairon421Dairon421 Member Posts: 12
How do you know when a steam is bad?

Comments

  • Jamie HallJamie Hall Member Posts: 13,403
    It will either fail open or closed. If it fails closed, the radiator won't heat at all, or very very poorly (and may even fill with water!). If it fails open, it will allow steam to pass once the radiator is more or less full -- and the outlet, measured a few inches beyond the trap -- will be as hot as the trap inlet.
    Br. Jamie, osb

    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.

    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
  • JohnNYJohnNY Member Posts: 2,494
    When a radiator trap fails open, that radiator tends to get very hot while it causes others, usually nearby, to not get hot.
    For troubleshooting and private consulting services, find John "JohnNY" Cataneo here at :
    "72°F Mechanical, LLC"
    Or email John at [email protected]
    John is the Boilers and Hydronic Heating Systems Course Instructor at NYC's Mechanics Institute, a professional Master Plumber, licensed by The Department of Buildings of The City of New York, and works extensively in NYC while consulting for clients in and out of state.
    For residential service and installations in New Jersey, please see Toro Plumbing & Mechanical and fill out our contacts page, upload pics, and submit, or call (973-672-1000).
  • Dairon421Dairon421 Member Posts: 12
    edited October 17
    Thanks guys. So now I understand that when a steam trap fail open it often gets to hot and cause other radiators not to heat because there will be steam in the return. When a steam trap fail close the radiator will not heat but the others will heat because the steam not entering the returns. Am I correct?
  • Jamie HallJamie Hall Member Posts: 13,403
    Got it
    Br. Jamie, osb

    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England.

    Hoffman Equipped System (all original except boiler), Weil-Mclain 580, 2.75 gph Carlin, Vapourstat 0.5 -- 6.0 ounces per square inch
    Dairon421
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