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  • Submitted: Feb 18 2011 02:25 PM
  • Last Updated: Feb 18 2011 02:25 PM
  • File Size: 205.26KB
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Download NPSH Tutorial

* * * * - 18 Votes



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Tutorial and example problems explaining the basics behind Net Positive Suction Head (NPSH). Available in both MS Word and PDF formats.


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good
Pardon my ignorance, but I think there is an error in the NPSH calculation. Since the tank bottom elevation of 10 ft (in the example given) is taken with reference to pump centreline, we need not subtract the pump centreline elevation (of 3 feet) as the NPSH is normally quoted at pump centreline.

Regards
Sanjay
Photo
Supriyo Mukherjee
Jan 11 2012 05:42 AM
I also thnk sanjay is right on this otherwise we have to mention liquid level from ground level as 10 ft in the avobe problem reffered. the document should be changed.
I agrre with the above comments. Normally the elvation or head of the liquid is referred to the center line of the suction so you don´t need to worry about the elevation of the pump with respect to the ground level.
Also, I suggest to change the arithmetic of NPSH as follows:
  • plus the elevation of the liquid level (if it is higher than the suction inlet nozzle) or minus the elevation of the liquid level (if it is below the suction inlet nozzle) with respect to the suction inlet nozzle
and you can suppress the next bullet.

I have translated your article to spanish, are you interested in a copy?
Good one. Pump Cl should be the basis.
Photo
Supriyo Mukherjee
Aug 23 2012 01:00 PM
Dear Art,

the article must be edited in some problems as the above comments stated.

Regards

Sir,

 

Though i feel there is minor error as stated in above comments.

 

But document is hery helpful. Its simplicity gives great understanding.

 

Thank you very much.

 

 


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