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  1. Ouahmed

    system curve

    Artisi:thx for your reply but i'm already calculted the total head loss in the pipeline for a fixed flow rate. i'm asking about the system's curve.
  2. Ouahmed

    system curve

    i want to get the system curve of a pipeline , i ask about the method,i calculate th loss for fixed flow rated and i use the formula : PDC = a * (Qv^2)to get the curve. with PDC is the losshead in the system Qv is the volume flow rate when can i use yhis formula ? is there any other method ?
  3. Ouahmed

    Flow velocity

    plazma, i'm not asking about turbulence , thx littleInch, i want to evaluate the velocity of the flow in pump station, so i ask if there is limits for the velocity (to not damage the pipes for example ...), i hope you get my point thx for all replies
  4. Ouahmed

    Flow velocity

    I'm asking about the eligibles values of the velocity in water pipeline (drinking water) (discharge pipes and aspiration pipes). I need references of these information.
  5. Ouahmed

    Support pipe

    I'm modeling in pipeline using AFT impulse and i want to know the difference between support "anchored upstream" , "anchored throughtout" and "with expansion joints".
  6. Ouahmed

    Air vessel sizing

    I appreciate your help
  7. Ouahmed

    Air vessel sizing

    i have problem of water hammer in pump station, and i want to know how to size an air vessel (analytical approach)? should i always also use a relief valve ? (this is the first time i work on this subject) Thx
  8. Ouahmed

    Cavitation

    Thx BigInch, I will try it
  9. Ouahmed

    Cavitation

    i'm running a transient model of pump station, and i found that there is a vapor volume in some pipes, and i don't know how to evaluate this volume: I mean that how can i know that volume is high or it is negligeable ?! Or it shoudn't exist even ? Thx
  10. Ouahmed

    AFT impulse

    Thx Biginch, i try it and it works, but there is something i don't understand it, the graph of pressure static function of time in pipe upstream and downstream the pumps gives an oscillation of max 30 bar and min 0.3 bar , and at one second the pressure rise to 180 bar and return to normal...
  11. Ouahmed

    AFT impulse

    I'm rtryinng to run a transient model of shutting off pumps with "Trip with inertia and no back flow or reverse flow" , so i can't define this junction (pump) because of efficiency values that i have entered in curve data (This error is given by The software) i didn't get the impact of...
  12. Ouahmed

    Pump station control

    Thx everyone !
  13. Ouahmed

    Pump station control

    Thx for yours replies ; Hi BigInch I want to learn how to do it Hi LittleInch i want to verify the diameter of pipes and the choice of pumps (cavitation and HMT ...).Infact, how can i know a station is correctly designed ?
  14. Ouahmed

    Pump station control

    I'm working on pump station which is already designed, But i'm want to just verify the design manually or using a software, have you any idea how shall i start?
  15. Ouahmed

    Best efficiency Point of pump

    Thx LittleInch
  16. Ouahmed

    Best efficiency Point of pump

    I want to know how to dertermiate the best effciency of centrifugal pump? and the speed R.P.M at this point? Thx
  17. Ouahmed

    i'm runing a model of pump station

    Hi AWloo ; Thx for your help
  18. Ouahmed

    i'm runing a model of pump station

    hi LittleInch thx for your replie,i will try it, i want to ask about the difference between transient model of pumps: -No transient-Four quadrant -Trip with Inetia and no back flow or reverse speed -Trip with inertia- Four quadrant -Start up with Inetia and no back flow or reverse speed...
  19. Ouahmed

    i'm runing a model of pump station

    Thx for yours replies Hi BigInch ; the velocity equal for 1.4 m/s. the steady state pressure is 17 bar. hi MFJewell ; i'm working on pump instantaneously going shut in water pump station,the distance between station and discharge tank is 10 km...
  20. Ouahmed

    i'm runing a model of pump station

    i'm runing a model of pump station and i have simulated, using AFT impulse as software, the shut off of pump and the surge caused by it, so i have surge around 300 bar in upstream and downstream pipes (DN400 and DN500). i don't know if surge can reach such pressure !! I feel like i'm missing...

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