The system below uses a centrifugal pump to circulate water at 19°C, having a vapor pressure of 2320 Pa,from a low reservoir to a higher one through a cast iron

pipe with a diameter of 35 cm and surface roughness of 0.25 mm. The minor head losses upstream of the pump are represented by EK1 = 0,6 and downstream by EK2 = 7. After several months of usage, it is noticed that the installation is noisy and consumes excessive amounts of energy. The pump is suspected to be incompatible with the system and you are asked to replace it with another from the manufacturer Ingersoll-Rand whose pumps' characteristic curves are provided below. a) Among the available pumps, choose the one that accomplishes the task with the best efficiency. Justify your choice,(15 pts.) b) Determine the volume flow rate, in m’/s, in the circuit when the chosen pump is used.(- c) Calculate the consumed power of this pump, in kW. d) Explain the phenomenon of cavitation in a centrifugal pump and provide three reasons why it should be avoided.(5 pts.) e) Will there be cavitation in the pump above? Show your calculations and provide comments.(10 f) Without doing any calculations, suggest two possible modifications to the system above in order to reduce the risk of cavitation.(5 pts.)