NPSH for Submersible Pump

Dear Nandlal,

YES. But its a very simple question for which you can easily and instantly get answer elsewhere instead of waiting for response here. Please see www.pipeflow.co.uk/public/articles/

Thanks Pritam

But is there any difference between calculating NPSHa for centrifugal pump and submersible pump

Your reference dosent say specifically for Submersible pump

No need to do this for this one. It has its own level switch (the red thing).

From OPPAPERS.COM:

Calculating Npsh Of Pump NPSHA in the system is calculated as :
NPSHA = Terminal Pressure in the vessel (in guage)
(+) Static Head of fluid above pump centre line (see note).
(+) Atmospheric Pressure
(-) Vapour Pressure of liquid at pumping temperature
(-) Friction loss in suction piping up to pump centre line consisting of the following :
? Entrance and exit losses
? Loss in suction strainer
? Loss in control valves, instruments, exchangers etc. if any
? Line losses
Note : a) The height of liquid in the vessel should be taken to be at the vessel bottom tangent line.
b) Height of the pump centreline is calculated as follows :
HPC = HPB + F where
HPC = height of pump centreline above finished floor level
HPB = height of pump centreline above pump baseplate
F = height of pump foundation above finished floor level
HPB is estimated from the following table based on typical vendor information :Pump Flow Rate Height of Pump Centreline (m3/hr) above Base Plate HPB

Thank you all