Consult your vendor for appropriate sizing information.
Bell and Gosset has an excellent sizing manual for sizing pressurized expansion tanks with a membrane barrier separator between water and air side.
There are a few things you need to know before you begin sizing:
-total system water content
-average system design water temp
-minimum fill pressure (pressure to overcome height of building +4 to 5 psi)
-max operating pressure of system
-static pressure of system
Methods differ from manufacturer to manufacturer as well as tank configurations. Don't forget to check code requirements.
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