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F&T steam traps

ykovatchki
ykovatchki Member Posts: 4
Few New 3/4 Hoffman F&T traps are not working properly. My low 5 psi steam pressure system run on -6 in Hg. Condensate return is to high 190-200 F. This season all new steam traps in whole building. Yordan-(716) 622-6907.

Comments

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 13,170
    @ykovatchki

    You need some trap testing equipment:

    Infrared thermometer
    temperature sticks
    ultrasonic tester are available

    to find the bad trap(s)

    Be advised that all traps will let a little flash steam pass
  • Steamhead
    Steamhead Member Posts: 15,769
    What is this system used for? Heating a building?
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
  • ykovatchki
    ykovatchki Member Posts: 4
    This is a High School Building.
  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 13,170
    @ykovatchki

    No one has a crystal ball or x-ray vision. We would be glad to help but you have to give out some more information on what the problem is
  • Steamhead
    Steamhead Member Posts: 15,769
    So, why are you running the steam pressure that high?

    I'd bet you're seeing "flash steam". This is where hot condensate from a higher-pressure area is discharged into atmospheric pressure, which causes some of it to flash back to steam. According to the chart in "The Lost Art of Steam Heating", going from 5 PSIG to atmospheric pressure means roughly 1.7 pounds of condensate per 100 pounds of condensate will flash back to steam, even with traps operating perfectly.

    Crank it down. Try running it at 2 PSIG and see if that helps. If some parts of the building don't heat well, check those areas for bad traps or inadequate air venting. And, lower steam pressures mean lowered fuel consumption, so you'll look like a hero unless your boss has some connection to your fuel supplier.

    Where are you located?
    All Steamed Up, Inc.
    Towson, MD, USA
    Steam, Vapor & Hot-Water Heating Specialists
    Oil & Gas Burner Service
    Consulting
  • JUGHNE
    JUGHNE Member Posts: 10,332
    F&T pass condensate water that is near the temp of steam.
    Little cooling happens as it does with rad traps.
  • ykovatchki
    ykovatchki Member Posts: 4
    I can’t lower the steam pressure because I have a low and high fire gas valves.

    The problem is solved.

    The yoke and the seed on the float ball needs to be adjusted. Doesn’t matter if the traps are new. On the new F&T 3/4 - (series - I and H) traps there is a gap between the yoke and the lever assembly and the ball on the float control does not close perfectly the seat because is moving side ways gust enough to stuck open.

    The factory should do this important adjustment !

    Thank you All.
  • ykovatchki
    ykovatchki Member Posts: 4
    Correction: my steam pressure is set for max. 3 PSI because, I have a low and high fire gas valves.
  • JohnNY
    JohnNY Member Posts: 3,062
    Your operating steam pressure and high-low fire burner have effectively no connection.
    Contact John "JohnNY" Cataneo, NYC Master Plumber, Lic 1784
    Consulting
    Plumbing in NYC or in NJ.
    Take his class.