Hi,
Thank you guys for your advise.
Butelja, I have not much knowledge about instrumentation, what do you mean exactly with electrical horsepower. If the pump is running against a closed valve -> head = 0 m. If I look at the centr. pump curve,then I see that the power usage isn't at its maximum, when head =0 m.
How do you measure "electrical horsepower"?
Thank you in advance.
Scyzoo