Apump is put into service at the coast where the barometric pressure is 760 mm hg. the conditions of service are : flow rate 0,08 m3/s, suction lift 3,5 metres, suction pipe friction loss 0,9 metres, water temperature 65°c, water velocity 4 m/s. under these conditions of service, the pump requires an npsh of 2,1 metres. assuming the density of water as 980,6 kg/m3, establish whether it will operate satisfactorily.

The pump operates satisfactorily.

Explanation:

According to the NPSH available definition:

Where:

The absolute pressure is the barometric pressure Pb minus the losses: Suction Lift PLift and pipe friction loss Ploss:

To convert the losses in head to pressure:

So:

The absolute pressure:

replacing on the NPSH available equiation:

As the NPSH availiable is higher than de required the pump should operate satisfactorily.

answer:

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