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Saturday, May 31, 2008

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A process plant is in debottlenecking phase and a pump is expected to be changed out. A datasheet submitted by pump vendor and stated the impeller size is 295mm with pump head of 120m as requested. The pump speed is expected to be high speed pump with 2950 rpm. Do you think this impeller can deliver the head ?

An short-cut equation is derived from velocity and head can be used to check if the pump head is good.

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Base on above equation, impeller size of 295mm, pump speed of 2950 rpm, and k normally is about 85%, the calculated pump head is about 90m (less than 120 m). It imply that the pump head may be over-estimated. Thus, a quick verification with pump vendor shall be done.


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posted by Webworm, 12:18 PM

2 Comments:

Anonymous Anonymous said...

This kind of calculation is not best method, instead better to chek pump family curves.

I cross cheked with a pump installd some years back. it is 2950 rpm,90 mtr head, 265 mm impeller dia. and as per calulation with this fomula it is off. Pump was selected using family curves. Also for process pumps one can get performance refering ISO 2925

March 12, 2010 at 2:06 AM  
Anonymous Webworm said...

Interesting.

March 12, 2010 at 11:50 AM  

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