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How to size an expansion tank?

7049 Views 7 Replies 7 Participants Last post by  MrEngr
I'm working on designing a central plant. I know I need expansion tanks for my HHW and CHW loops but I need some direction on how to size them.

Any help would be much appreciated.


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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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