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  1. #1
    Join Date
    Sep 2010
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    Water/Pump pressure?

    What do you do to determine proper pump/water pressure on closed loops. If just checking/ inspection of system? Positive-Negative suction?

  2. #2
    Join Date
    Feb 2010
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    In a boiler room
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    What kind of loops? Boilers? Chillers? Ground Loops?

  3. #3
    Join Date
    Sep 2010
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    Quote Originally Posted by Chuck View Post
    What kind of loops? Boilers? Chillers? Ground Loops?
    Chiller and boiler.

  4. #4
    Join Date
    Feb 2010
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    In a boiler room
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    Depends on the original design and the height of building. Always positive.

  5. #5
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    Sep 2010
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    Quote Originally Posted by Chuck View Post
    Depends on the original design and the height of building. Always positive.
    I guess maybe shutdown pump and check static. Then pressure X 2.3 ft per pound= rise.. Such as 50ft high= (21.7 lbs) --22lbs static.

  6. #6
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    Quote Originally Posted by OhioTech View Post
    I guess maybe shutdown pump and check static. Then pressure X 2.3 ft per pound= rise.. Such as 50ft high= (21.7 lbs) --22lbs static.
    Don't forget NPSH.

  7. #7
    Join Date
    Aug 2009
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    Prattville, Alabama
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    2,145
    I like to have a positive 5-10 psig at the lowest pressure point in the system. This point is usually found at either the pump suction or at the highest elevation of the system. Check while in operation and at idle, just to be safe. This helps to ensure all coils are covered(or full) and no leaks suck air. OhioTech's formula is a great starting point, but verify with gauges.

  8. #8
    Join Date
    Dec 2008
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    Dixiana, AL
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    2,611
    You've double posted this thread.

    Again - you need to explain what the particulars are of the system you have to work with.

  9. #9
    Join Date
    Jul 2011
    Location
    East coast USA
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    Quote Originally Posted by OhioTech View Post
    What do you do to determine proper pump/water pressure on closed loops. If just checking/ inspection of system? Positive-Negative suction?
    for one thing you need to know what your water is supplying. Your question doesn't make sense. I just spent a day balancing a closed loop what exactly are you looking for?

    You wont have a negative suction.

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