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Glycol mixture 70/30 initial fill pressure

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JHK
JHK Member Posts: 19
In a glycol piping loop for chilled water or a dry cooler (Liebert) do you still want the highest point under 3-4 psig with the pump off or do you want to keep it at a higher pressure at the highest point? 

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  • Jamie Hall
    Jamie Hall Member Posts: 23,313
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    Glycol or not makes little difference. However... be sure that the pressure at the inlet to the pump when the pump is running is also at least 3 to 4 psi.
    Br. Jamie, osb
    Building superintendent/caretaker, 7200 sq. ft. historic house museum with dependencies in New England
  • pecmsg
    pecmsg Member Posts: 4,853
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    How many ft to the highest point, top to bottom?
  • hot_rod
    hot_rod Member Posts: 22,151
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    Hopefully not a 70% glycol, 30% glycol mix?
    At least 5 psi pressure at the highest point in the system. 10- 12 psi is a common fill for 1 and 2 story buildings.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • JHK
    JHK Member Posts: 19
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    Thanks for the replies, I do appreciate it. The height is 18 feet. It is 70% water. 
  • hot_rod
    hot_rod Member Posts: 22,151
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    18 X .433= 7.8 psi to lift water to the high point. add 5 for 12.8 psi at the fill valve. 12 psi is fine.
    Most expansion tanks and fill valves come preset at 12 psi. But always confirm the tank precharge.
    Bob "hot rod" Rohr
    trainer for Caleffi NA
    Living the hydronic dream
  • JHK
    JHK Member Posts: 19
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    Ok, thank you.