A pump station has been designed to lift water out of a 6 metre deep pit (vented

Question

A pump station has been designed to lift water out of a 6 metre deep pit (vented to atmosphere) via a centrifigual pump mounted at ground level.                

                   Liquid conditions                               20 OC

                   Suction pipe work losses                2.0 metres

                   NPSH safety factor                            5.0 kPa

                   Vapor pressure @ 20oC                   0.25 metres

Part (a)

Calculate the Net Positive Suction Head (NPSH) for the system ?

In summer the liquid temperature rises to 60 oC, this changes the water vapor pressure to 2.05 metres. What is the revised NPSH for the higher water temperature ?

Part ( c)

Pressure loss in the suction pipe work is directly proportional to water veloicty in the pipe work squared, which is inversely proportional to suction pipe work diameter squared.

Explanation / Answer

a) 8.25 metre

b) 10.05 metre

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