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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.

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 ?

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

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.

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".

I appreciate your help

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

Thx BigInch, I will try it

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

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...

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...

Thx everyone !

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 ?

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?

Thx LittleInch

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

Hi AWloo ; Thx for your help

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...

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...

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...