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expansion tank connection pipe size

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pardon_my_ignorance
pardon_my_ignorance Member Posts: 18
in THE MAIN WALL
what is the relationship between the connection pipe size and the tank size?

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  • SWEI
    SWEI Member Posts: 7,356
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    Whatever the manufacturer decided it should be. Flow rates into and out of the tank should be quite low in the overwhelming majority of systems.
  • RobG
    RobG Member Posts: 1,850
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    I just go with the size of the tanks inlet. It makes it pretty foolproof.
  • Solid_Fuel_Man
    Solid_Fuel_Man Member Posts: 2,646
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    I would be very surprised if there was a system with less than 250 gallons of water capacity that would need any more than a 3/4 line to expansion.

    Think about what expansion really is and heat input into the system. The flow is slow and steady upon a cold boiler startup and almost new nill when a system is running at operating conditions. Very large boiler fireing rates could be the only thing that drives fast flow to expansion.
    Serving Northern Maine HVAC & Controls. I burn wood, it smells good!

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