A single acting reciprocating pump has a diameter of 0.3 m and stroke of 0.4 m. It takes its supply of water from the sump 3 m below the pump axis through a pipe 10 m long and 0.2 m diameter. If the separation occurs at 2.5 m of water absolute, find (i) speed at which separation may take place at the commencement of the suction stroke and (ii) change in speed of the pump if an air vessel is fitted on the suction side 2.5 m above the sump water level. Show that by fitting the air vessel, the pump can run at higher velocity without any chance of separation. Assume f = 0.01 and barometric head = 10.3 m of water.
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