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Tank Filling from Top acting back on system

0257.Bentley.zip

I have a scenario that includes pumping to a downstream tank. This tank fills from a pipe located about 3 feet above the maximum water surface elevation in the tank. I don't need to model the tank draining, and there is no valve controlling the inflow. Any set up I have tried with the tank filling form the top still results in HGL acting back on the system. Using a D2A element has not been successful either.

Any ideas about how to best model this?

Thank you!

Parents
  • results in HGL acting back on the system.

    It sounds like this is the part you're concerned with - can you clarify what you mean and what result you expected to see? The D2A element in the model you provided simulates a rating table of pressure vs. outflow. (which sounds like the right approach if you have a top-fill tank above the water surface elevation and do not need to consider the tank draining/filling) When computing the model, the pressure at the D2A is about one foot, with an outflow of 590 GPM (based on the pair of "typical flow" and "typical pressure drop" that you entered). This pressure translates to a hydraulic grade of 374 ft, based on the D2A elevation. The upstream pump is what provides this hydraulic grade and outflow. 

    Please elaborate on what you are seeing vs. what you expected to see.


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

Reply
  • results in HGL acting back on the system.

    It sounds like this is the part you're concerned with - can you clarify what you mean and what result you expected to see? The D2A element in the model you provided simulates a rating table of pressure vs. outflow. (which sounds like the right approach if you have a top-fill tank above the water surface elevation and do not need to consider the tank draining/filling) When computing the model, the pressure at the D2A is about one foot, with an outflow of 590 GPM (based on the pair of "typical flow" and "typical pressure drop" that you entered). This pressure translates to a hydraulic grade of 374 ft, based on the D2A elevation. The upstream pump is what provides this hydraulic grade and outflow. 

    Please elaborate on what you are seeing vs. what you expected to see.


    Regards,

    Jesse Dringoli
    Technical Support Manager, OpenFlows
    Bentley Communities Site Administrator
    Bentley Systems, Inc.

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