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 m2/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.

Yes, the Pump will operate satisfactorily, because the NPSH is greater than required.

Explanation:

NPSH isa measure of how likely the fluid at the suction end of the pump is to experience cavitation. We always need NPSH to be above a given treshold required by the pump.

The definition of NPSH is:

Where:

Extra Data: Water's vapour pressure at 65°C

We can now calculate the NPSH

We can see that our NPSH is greater than the required NPSH:

Thus our pump will operate without cavitation.

a skateboard rolling across the street - apex