Expansion tank pressure

Discussion in 'Plumbing Forum, Professional & DIY Advice' started by fishman777, May 22, 2008.

  1. fishman777

    fishman777 New Member

    May 20, 2008
    One last question, am I correct in doing this.
    To get correct pressure in my diaphram expansion tank do I measure the pressure at the faucet with a gauge and then match the air pressure in the expansion tank to that, and check with a tire gauge...is this correct?
  2. Cass

    Cass Plumber

    Nov 12, 2005
    Measure the water pressure at a hose bib with nothing running in the house, then pre-charge the tank B 4 installing it with the same pressure or less by 2# I like to go 2#s less so the bladder is slightly inflated. Just my way of doing it. The Mfg. says same pressure. Then install the tank.

    If the tank is mounted horizontally it needs to be supported.
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