i have one problem for pumping treated water in line 4 bars there is no suitable pump with this suitable head so what is the procedures for series instlations ?
Chose identical pumps same flow rate and same head and by installing them in series the head will sum up and the flow rate will stay the same , so if you chose 4 identical pump with 1 bar in head each and install them you will get 4 bars and the same flow rate.
For more information about series and parallel pumps visit this website it is helpful :
http://www.firavia.com/pump.html <<< page 39.
http://www.firavia.com/mecheng.html <<< fluid mechanics section.