Calculate net positive suction head (npsh) for the system

Assignment Help Mechanical Engineering

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 20⁰C

Suction pipe work losses 2.0 metres

NPSH safety factor 5.0 kPa

Vapor pressure @ 20^oC 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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