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Discussion Starter · #1 ·
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.

Thanks,

Brian
 

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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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Here is a link that shows you how to size an expansion tank

Look here, the forum is giving me a problem with posting a URL so you will have to take out the spaces.

www . engineermanual . com/index.php?title=23_21_16.13_Expansion_Tanks
 
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