Abstract
In the field of pump-based hydraulic systems sometimes occur certain deviations of real performances, in comparison with those planned by means of design. In general the problem appears due to some discrepancies between the actual parameters of the existing system and those taken as assumptions during the pumping station design. The result is that in fact pumps are working at excessive flows, in regimes located nearby the “right” end of head parameters, and this with the corresponding consequences. That is, pumps tend to produce cavitation (this depending on the water levels within associated water tanks). Moreover, in extreme situations, there occurs the risk of motors overheating, combined with severe vibrations. In order to avoid this it is mandatory to soundly adjust the operational regimes (in real existing conditions) creating a situation in which current regimes are to be shifted towards left side, on the real head curve of used pump.
This paper refers to the possibility to avoid unwished operational regimes by mounting adequate restriction orifice plates on the pumps’ delivery main.
