Calculate net positive suction head (npsh) for the system

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Reference no: EM1339111

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                  200

 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 ?  

Part (b) In summer the liquid temperature rises to 600C, 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. 

Reference no: EM1339111

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