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Sticky Diaphragms (ME)

Weezbo
Weezbo Member Posts: 6,231
in THE MAIN WALL
sorta on the Old side made by Cat...

Comments

  • [Deleted User]
    [Deleted User] Posts: 108
    Is it just me, or.

    It seems that we are experiencing a number of stuck diaphragms on diaphragmatic type expansion tanks on systems with rubber hose connected to them. Is anyone else experiencing this phenomenon?

    TIA

    ME
  • ALH_4
    ALH_4 Member Posts: 1,790
    Stuck

    Stuck to what? I have had to initially fill the system to 25psi or so to get the diaphragm to come loose from the inside of the expansion tank, but those were new tanks and after that they were fine. They were Elbi tanks.
  • [Deleted User]
    [Deleted User] Posts: 77
    Stuck to the inner face of the tank

    > Stuck to what? I have had to initially fill the

    > system to 25psi or so to get the diaphragm to

    > come loose from the inside of the expansion tank,

    > but those were new tanks and after that they were

    > fine. They were Elbi tanks.



    No expansion acceptance ability, leaking relief valve...

    ME
  • [Deleted User]
    [Deleted User] Posts: 77
    Stuck to the inner face of the tank

    No expansion acceptance ability, leaking relief valve...

    ME
  • Unknown
    Unknown
    dunno about the

    Dunno about the stuck rubber bladder problems... But I do have those crappy extrol tanks giving out so soon...
  • hot_rod
    hot_rod Member Posts: 24,640
    why don't they make expansion tanks like

    well tanks? Put the fluid in the rubber bladder not the tin tank.

    Often times premature expansion tank failures are indications of a non barrier tube system. Or other sources of O2 ingress:)

    Even barrier pex systems, that operate at elevated temperatures, seem to dissolve tanks faster. EVOH barriers only LIMIT O2 ingress.

    hot rod

    hot rod
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • Kal Row
    Kal Row Member Posts: 1,520
    i am generous with the air precharge..

    Seems to help for this, also you loose ½ lb of pressure across the diaphragm every year, so they have to be rechecked – all my exp tanks are preceded by a ballvalve, draincock, and union, to facilitate easy isolation for recharge
  • Guy Woollard
    Guy Woollard Member Posts: 82
    thought

    I have not had much experience with rubber hose type systems, but I do have a question: Is it normal practice to use either a lubricant or a sealant on the fittings during assembly? Excess could run through the system and seal the bladder in place.


    Guy Woollard
    N.E. Regional Sales Mgr
    Triangle Tube Corp.
  • Kal Row
    Kal Row Member Posts: 1,520
    maybe flux and assembly oils..

    can be reacting with the blader
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