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Surge Analysis with Bladder Surge Tank

Dear Bentley Team,

I have developed Surge Model and provided Bladder Surge Tank for the protection of Pipeline. I have provided 10 bar Gas preset pressure in order to reduce extreme pressure in pipeline . I would really appreciate any suggestion regarding Preset pressure and Tank Volume. I have also uploaded my model.

Regards,

SA

  • Thanks Sushma for your help. I have compared different scenarios. Tank near Pump Station is giving me better results.

    Regards,

    SA

  • Hello Syed, 

    You can compare different scenarios here whether 1 surge mitigation device is enough or 2 are required that will depend upon the results you are getting and your engineering judgement. If one provides the enough protection second one will not be required. It is a trial and error method, try placing alternatively at both locations and where you are getting better results for surge protection. 

    Regards,

    Sushma Choure

    Bentley Technical Suppport

  • Thanks a lot Sushma really appreciate your quick response.  I provided hydropneumatic tank at lowest point where I am getting very high pressure. I developed this model as a trial after that I will incorporate another tank near pump station or only one tank is sufficient for this system? I am working first time.

    Regards,

    SA 

  • Hello Syed, 

    Thank you for uploading model files, is there any reason for selecting to have hydropneumatic tank away from pump station, generally hydropneumatic tanks are placed near the pump stations, just downstream of it. 

    As a trial when placed hydropneumatic tank downstream of pump station at a tee, the results are much better with same dimensions of tank. 

    The preset pressure you entered appears to be high, if you are not sure about this value, check below wiki and calculate it based on an assumed initial bladder size (gas volume).

    Entering Hydropneumatic tank gas preset pressure based on assumed initial bladder volume 

    About volume of tank, HAMMER assumes that the water volume in the tank is enough so that this does not happen. In the Transient Analysis Output Log (Under Report > Transient Reports), you will see the maximum volume of gas that is needed during the transient analysis. You will then need to provide a hydropneumatic tank that will be able to accommodate that maximum volume of gas and still not become empty of water. See below for more on this - check SIZE topic. 

    Modeling Reference - Hydropneumatic Tanks 

    Regards,

    Sushma Choure

    Bentley Technical Suppport