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Water Hammer warning message

Dear Bentley:

I am doing hammer analysis for sanitary forcemain and I sugessted hydropneumatic tank for protection, but I got the following warning message

48117 "With Surge Protection" "Hydropneumatic Tank" "263" "HT-1" 0.000 "The maximum and minimum pressure of gas is (0.36E+02 m H2O) and (0.15E+02 m H2O), the maximum and minimum volume of gas are (0.61E+02 m³) and (0.30E+02 m³)." Transient Engine.

so kindly what is the hydrulic benfit of this message or how can read this message for hyadulic point of view?

 

my second question How can i plot curve to show the ratio of Gas and water inside the hydropnematic tank along with time, or if there is anaimation to show it.

 

 

Regards

Eng. Sayed Elhagar

  • Hello Sayed,

    1) The user notification you mentioned is informational, summarizing for you the maximum and minimum pressure and volume inside the hydropneumatic tank. This can be used to quickly see the range of pressures and volumes in your tank. For example if you see that the maximum volume of gas is nearly equal to the full tank volume, then you know it almost became empty during the simulation. You can then see more details using the transient results viewer and/or text reports.

    2) The way that you can view a graph of gas/water volume inside the tank over time depends on your version of HAMMER. Starting with the latest version (SELECTseries 5, 08.11.05.61 - you can check this under Help>About) you can view this in the Transient Results Viewer, in the "Extended Node Data" tab. More on this can be seen in the below Technotes:

    What's New with Bentley HAMMER V8i SELECTseries 5

    Modeling Reference - Hydropneumatic Tanks

    If you have an older version (08.11.04.58 and earlier), enter a number for the Report Period field in the hydropneumatic tank properties, compute the model and look at the bottom of the Transient Analysis Detailed Report. See more on this in the below Support Solution:

    How to graph extended transient results such as gas volume, pump speed, etc


    There is also quite a bit more information on modeling hydropeumatic tanks in the above "Modeling reference" technote.


    Regards,

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

    Answer Verified By: Sushma Choure