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F and t

retep
retep Member Posts: 13
Two pipe steam without f and t?

Comments

  • Jamie Hall
    Jamie Hall Member Posts: 18,946
    retep said:

    Two pipe steam without f and t?

    Say again? Most two pipe steam systems do not have -- nor need -- an F&T. There are a few special situations where one might be needed -- but more often than not someone put one on as a bandaid fix to cover the symptom of either a failed radiator or crossover trap or, once in a while, excess pressure.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • retep
    retep Member Posts: 13
    In holograms lost art book he says in two pipe with a dry return you need f and t
  • retep
    retep Member Posts: 13
    Holohan
  • JUGHNE
    JUGHNE Member Posts: 9,763
    If the end of the main is vented and dripped into a wet return, below the water line, (could be right at the boiler) then no F&T needed.

    Same for the dry returns from the rad traps, could be dripped the same way with air venting.

    Is this gravity return or pumped?
  • retep
    retep Member Posts: 13
    Gravity
  • Steamhead
    Steamhead Member Posts: 15,334
    Where are you located?
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 12,004
    @retep
    What is your question?
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 15,983
    edited May 2019
    @retep, a two-pipe steam system is going to have some sort of vent after the radiator traps because every steam system has to get rid of its air. If it's a dry-return system, the F&T at the end of the steam main (after it feeds the radiators) stops the steam from reaching into the dry return main. If there's steam in that line, the air won't be able to get out of the radiators through the radiator traps. In lieu of the trap, some of the Dead Men used loop seals at the end of the main.

    I hope that helps, and thanks for calling me "hologram." That made me laugh out loud, which is always a nice way to begin a day.
    Retired and loving it.
  • Jamie Hall
    Jamie Hall Member Posts: 18,946
    And some crossover traps...
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • Erin Holohan Haskell
    Erin Holohan Haskell Member, Moderator, Administrator Posts: 1,864


    I hope that helps, and thanks for calling me "hologram." That made me laugh out loud, which is always a nice way to begin a day.

    I've been thinking about adding a Holohan hologram to the website. ;)
    President
    HeatingHelp.com
    ethicalpaul
  • retep
    retep Member Posts: 13
    Can't take credit for hologram I think spell check did it thanks for the help conflicting info had me wondering
  • DanHolohan
    DanHolohan Member, Moderator, Administrator Posts: 15,983
    My pleasure all around! Thanks.
    Retired and loving it.