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Overhead boiler expansion tank

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SethYank
SethYank Member Posts: 36
I came across this expansion tank yesterday. The circulator is on the return to the boiler, plugged into a wall outlet. The supply and return from the boiler go into this tank and the house supply and return come into the tank also. I am assuming the piping doesn't connect inside the tank. I am trying to figure out how to purge this system, there in no purge in the return from the house.

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  • JUGHNE
    JUGHNE Member Posts: 11,109
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    Possibly a buffer tank?
    For an old gravity system?
    Only one pump?
    Open expansion tank in attic perhaps?
  • SethYank
    SethYank Member Posts: 36
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    only one circulator that i saw, base board heat, piping is 1 1/4 inch copper running horizontal in basement so don't think old gravity, did not get in attic. I am trying to figure out why the water is going to want to go out to the house and not just short circuit in the tank to the boiler.
  • SethYank
    SethYank Member Posts: 36
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    Is this a buffer tank?
  • JUGHNE
    JUGHNE Member Posts: 11,109
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    IDK, just guessing.
    2 pipes in and 2 pipes out?
    Does the label at the air bleeder on the tanks say something about water level?
    Sounds like the pump could run continuously being plugged in like that.

    More pictures of boiler piping probably help.
    SuperTech
  • STEVEusaPA
    STEVEusaPA Member Posts: 6,505
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    Well that's 'different'.

    There was an error rendering this rich post.

  • EBEBRATT-Ed
    EBEBRATT-Ed Member Posts: 15,840
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    I suspect there must be another pump
  • hot_rod
    hot_rod Member Posts: 22,483
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    I wonder if there are dip tubes or some sort of diverters/ looks like all the connections down low would just flow across to one another? The air bleeder make me think it is an expansion vessel somehow.

    Was it working when you discovered it? full of water? Any other expansion vessel?
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • SethYank
    SethYank Member Posts: 36
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    No the circulator was seized, something about running 365 days a year and not being oiled. the tank was half full right at the air vents. I ran into some one who had seen these before and he said they were a buffer / expansion tank. So there must be another circulator some where, but since the customer thinks I overcharged him for expecting overtime on a Saturday afternoon to replace the circulator I wont be going back.
    DZorodelta T
  • JUGHNE
    JUGHNE Member Posts: 11,109
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    Darn, it was so interesting looking!

    His circ probably quit on a Wednesday and thought it would come back to life......then he calls on a Sat. AM....SOP for many.
    DZoro
  • HVACNUT
    HVACNUT Member Posts: 5,890
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    One of the vets here must have some history on that.
    @SethYank you left us hanging. Get in the box. 2 minutes for instigating.
    How would you even Google that?
  • SethYank
    SethYank Member Posts: 36
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    I dont know that is why I posted it here. some one else has to have seen one of these
  • hot_rod
    hot_rod Member Posts: 22,483
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    where are you located. Often you find more installations like that in an area
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Gordy
    Gordy Member Posts: 9,546
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    First experimental attempt at hydraulic separation :)