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Thread: Over pressurized glycol loop

  1. #1
    Join Date
    Jun 2012
    Posts
    5

    Over pressurized glycol loop

    Hi there,
    We are installing a glycol system and as expected running into some issues. Our headers are 1.5 inch and our drop downs are 1 inch. We have installed a valve from supply to return that can be adjusted to release excess pressure. We do not have a VFD to adjust pump speed. when this system is on and none of the tanks are calling for glycol, it runs at 23psi(this is with the PRV being wide open back into the return piping). Is it a bad idea to choke down the valve comping off of the process pump to lower the pressure throughout the system?

  2. #2
    Join Date
    Nov 2002
    Location
    Mobile, Alabama, USA
    Posts
    139
    You could toggle it back, but 23 psi shouldn't be too stressful on the system. Is the process pump cavitating? If you are concerned, can you plumb in a larger bypass valve?
    Todd G Hicks
    BeerDenizen Brewing Services
    Serda Brewery (Brewery-In-Planning)

  3. #3
    Join Date
    Jun 2012
    Posts
    5
    Quote Originally Posted by Todd Hicks View Post
    You could toggle it back, but 23 psi shouldn't be too stressful on the system. Is the process pump cavitating? If you are concerned, can you plumb in a larger bypass valve?
    Good advice thanks, the pump is not cavitation but then again we really haven't run the system much because we are waiting to find a solution to the problem. Will a bypass valve that is larger than the 1.5 inch return pipe make a difference? Meaning that we could put in a larger bypass valve but then it would go back down to 1.5 inch piping.

  4. #4
    Join Date
    Nov 2002
    Location
    Mobile, Alabama, USA
    Posts
    139
    Quote Originally Posted by Npanch View Post
    Good advice thanks, the pump is not cavitation but then again we really haven't run the system much because we are waiting to find a solution to the problem. Will a bypass valve that is larger than the 1.5 inch return pipe make a difference? Meaning that we could put in a larger bypass valve but then it would go back down to 1.5 inch piping.
    Not really. A lot of times, I see the bypass valve being undersized rather than same size as the pipe. From being cheap. The limiting factor of a bypass valve is the orifice may still restrict full flow.

    I don't think you have a problem to worry about. Once you get the cellar into operation, there will be glycol flowing to tanks most of the time, so the stress will somewhat be taken off of the bypass.
    Last edited by Todd Hicks; 01-09-2017 at 01:48 PM.
    Todd G Hicks
    BeerDenizen Brewing Services
    Serda Brewery (Brewery-In-Planning)

  5. #5
    Join Date
    Mar 2007
    Location
    Tustin, CA, USA
    Posts
    49
    Hi,
    What is the specified max flow for you glycol pump?
    How many linear ft. of header piping do you have?
    What is the height difference from your chiller to your header?
    If you provide this I could do some calculations for you.

    Cheers!

    Dan Strömberg
    Cooling Market Segment Manager
    Georg Fischer LLC
    Phone: +1 714 368 4196
    Fax: +1 714 368 4197
    Mobile: +1 951 642 2339
    Dan.Stromberg@georgfischer.com

    GF Piping Systems
    9271 Jeronimo Rd., Irvine, CA. 92618
    United States
    www.gfps.com/us

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