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Wednesday, May 28, 2008

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A task assigned to a young engineer who has just graduated from University with good grade. He is requested to conduct a detailed pump hydraulic calculation. One of the routine information required to be calculated is to determine the motor rating and estimate the pump power consumption to estimate the overall power demand, hence to determine the power generation capacity. In order to determine pump power consumption, its motor rating shall be determined first. Pump motor rating required pump shaft power estimation as design condition. A general equation widely used to calculate pump shaft power is

Normally the pump efficiency is provided by the pump vendor.

What would be the pump efficiency value if pump have not been selected ?

One of the formula common used to estimate pump efficiency is as follow :


Above equation has limited to 300 feet and 1000 gpm, for larger head and flow, please refer to "Estimate Pump Efficiency base on Specific Speed (Ns)".

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posted by Webworm, 3:27 PM

2 Comments:

Anonymous Anonymous said...

My pump head is less than 50 feet. please can you help with another formula to estimate pump efficiency.

August 27, 2011 at 4:24 AM  
Anonymous JoeWong said...

Try out
http://webwormcpt.blogspot.com/2008/06/estimate-pump-efficiency-base-on.html

August 30, 2011 at 9:46 PM  

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