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PEDARRIN2, You are right, so it is more economic to install equipments in high level as you can because you will need no strong equipments to bear high pressure

HVACDomain, Assume we have 150 meters tall building and the pumps installed in zero level then, after finished installation we will fill the network by water If we take the pressure gauge reading before running the pumps at zero level we will read about 15 bar . the pressure will be the same...

Timothi But with regard to velocity pressure is not our topic now to avoid more confusion

Timothi Yes, this confusion only occurs in the case of closed loop because regaining pressure during down flow as you said

There is a difference between the pressure required from pump which is generated by the pump itself (dP)and the hydrostatic pressure generated by elevation the fist one, we considered it for moving the fluid but the second one we considered it for determining the max. working pressure inflicted...

note: carefully check your ampere immediately after changing the pulley because all previous calculations is theoretical and the practical one sure is different

theoretically the rpm is proportional to the flow and the static pressure is proportional to square flow and power is proportional to cubic flow so, in you case the current (witch proportional to power)is 6 A and the max. current is 12 A then simply theoretically: the max. available flow rate...