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Thread: Pump Question

  1. #1

    Join Date
    May 2013
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    22

    Pump Question

    My model runs fairly well, but bogs down and fails when I put on demand multipliers above 1.5. In investigating the issue, I have found that my pumps are operating at a point 10psi lower than the pressure indicated at the nearest downstream node which is the trigger for their operation. So when the second pump is to come on, it is already outside of its operating range. Any insight into this issue would be appreciated

    Thanks, D

  2. #2
    Member

    Innovyze Employee



    Join Date
    Mar 2013
    Posts
    72
    More detailed information is needed: (1) are the pumps VSP? (2) do the two pumps operate with the same control?

  3. #3

    Join Date
    May 2013
    Posts
    22
    Hi Shawn,

    Sorry. They are not VSPs. They both operate based on remote junction pressure which is the first junction after each pump. They are not controlled by the same junction. The first one is on/off at 68/73 and the second is 60/70. Please let me know if more information will help.

    Thanks, D

  4. #4
    Member

    Innovyze Employee



    Join Date
    Mar 2013
    Posts
    72
    It might be an unbalanced error. What is your maximum trials? Did you see any warning/error message about these two pumps? If so, I would like to take a look.

  5. #5

    Join Date
    May 2013
    Posts
    22
    It is an unbalanced error. Maximum trials are set at 40. There are not warnings about the two pumps specifically, but those keep turning on and off during the trials. I sent a message to your inbox.

  6. #6

    Join Date
    May 2013
    Posts
    22
    I resolved the issue by adding a hydro-tank. Thanks for your assistance.

  7. #7
    Member

    Innovyze Employee



    Join Date
    Mar 2013
    Posts
    72
    thanks for the update! The hydro-tank will stabilize the numerical simulation a lot.

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