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Loop seal?

Paul S_3
Paul S_3 Member Posts: 1,261
edited December 2016 in THE MAIN WALL
Is this a loop seal? It looks a little different....i saw this pic on instagram they say theres about 10 of them in the system....maybe at the ends mains....its a one pipe steam system and the bottom pipe is all wet .... I dont see a point for this
ASM Mechanical Company
Located in Staten Island NY
Servicing all 5 boroughs of NYC.
347-692-4777
ASMMECHANICALCORP@GMAIL.COM
ASMHVACNYC.COM
https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company

Comments

  • Danny Scully
    Danny Scully Member Posts: 1,416
    edited December 2016
    Hmm, false waterline more likely. Or, as always, could have just been a knucklehead!
  • EzzyT
    EzzyT Member Posts: 1,294
    That is a Loop Seal
    E-Travis Mechanical LLC
    Etravismechanical@gmail.com
    201-887-8856
    MilanD
  • Paul S_3
    Paul S_3 Member Posts: 1,261
    @EzzyT you are correct but @Danny Scully brought up a good point about the false water line with the inverted u seal
    ASM Mechanical Company
    Located in Staten Island NY
    Servicing all 5 boroughs of NYC.
    347-692-4777
    ASMMECHANICALCORP@GMAIL.COM
    ASMHVACNYC.COM
    https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,455
    edited December 2016
    Don't see a need for it unless the return line was above the boiler water line. Seems like they must have had a reason.................??

    In the old days they counted every fitting, hard to believe they did this by accident.
  • A false waterline is a little more complicated and would handle all the wet returns next to the boiler.
    Maybe those dry returns are pretty low at that point, and with too high a pressure, the wet return waterline would obscure the main vent, without that configuration.--NBC
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,513
    Loop seal
    Retired and loving it.
  • MilanD
    MilanD Member Posts: 1,160
    Did this allow dimension "A" be less than 14", (18" being preferred)?
  • Steamhead
    Steamhead Member Posts: 16,796
    Is there a condensate or boiler-feed pump at the end of that return line?
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 16,513
    I would think there would be a condensate pump. Otherwise, why trap that main?
    Retired and loving it.
  • Mad Dog_2
    Mad Dog_2 Member Posts: 6,831
    Love those return bend fittings...mad dog
  • Paul S_3
    Paul S_3 Member Posts: 1,261
    there is a condensate reciever
    ASM Mechanical Company
    Located in Staten Island NY
    Servicing all 5 boroughs of NYC.
    347-692-4777
    ASMMECHANICALCORP@GMAIL.COM
    ASMHVACNYC.COM
    https://heatinghelp.com/find-a-contractor/detail/asm-mechanical-company
  • Steamhead
    Steamhead Member Posts: 16,796
    That explains it.

    The advantage of a loop seal over a trap is that it does not have any moving parts. The disadvantage is that it will not vent air, so you need a main vent to do that. But if a vent fails, it won't let steam into the return and cause banging.
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting