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How to draw pump curve with duty point?

hi i'm trying to draw the pump curve showing on it the pump duty point as in  attached file  ,could you pleas tell me how can i draw this curve in Bentley hammer 

thanks and best regards serine
  • Hello Serine,

    You can specify the pump curve in the pump definition as a simple single design point curve wherein you can specify only the design flow and the corresponding head. You can also specify multiple point curve if you have the pump data from the manufacturer.

    The duty point of the curve depends on the demands in the system. The duty point is the point on the pump curve at which the pump is currently operating.

    To understand if your pump is operating on the duty point specified, you should take a look at the system head curves which represent the pump operation based on system demands, tank levels and network topology. HAMMER does not have the provision to view system head curves, because HAMMER assumes that the pump are already adequately setup for transient analysis. However, you can check the same in WaterGEMS or WaterCAD.

    By comparing the system head curves at various times you can get a fair idea of the duty point of the pump. If this matches up with your manufacturer data then the pump is appropriately setup and is functioning as designed.

    See the below article to understand system head curves;

    Understanding System Head Curves in WaterGEMS, WaterCAD, and SewerCAD

    Hope this helps.


    Regards,

    Yashodhan Joshi

  • thanks for your kind reply ,the curve i want to draw shows only the pump curve ,and duty point ,also at the bottom shown the legend for head operating point and efficiency operating point ,at time zero which means steady state,initial conditions   

  • Hello Serine, 

    In Hammer calculation options, (Analysis > Options > Steady State /EPS solver), you have time analysis type set as steady state , if you change it to EPS, you should be able to see the pump curve for multiple steps of EPS run. 

    Regards,

    Sushma Choure

    Bentley Technical Suppport