pump resizing

[valdc]

Hi im a newbie here and in the pump engineering field. Let me start by thanking you guys for sharing all these knowledge.. i have found this site very useful.

I am curently in a water utility, producing water from borehole wells, with the use submersible centrifugal pump. The current set-up would always be with the presence of a resevoir tank, that makes the motor operate on constant speed.

As i have said, i am fairly new in the field, and all that i have are from what experiences I've had and observations...

First i was given this formula by my superiors...

q = Q/(SWL-DWL)

where:
q = specific well capacity
Q = discharge
SWL = static water level
DWL = dynamic water level

so in trying to size up pumps which are on operation, i could get all these data, and compute for q.

then for resizing, i just input my new expected Q, then calculate for the new DWL using as my dnamic head, then plot it on the pump curve to know what pump model i would be using.

i'd like to know if anyone else is using this, or am i doing the right thing here?


best regards,

valdc

 

[BigInch]

It may be a relation that works sometimes, but if it does work, it would be far too specific to an individual installation to be in general use.

**********************
"Pumping accounts for 20% of the world’s energy used by electric motors and 25-50% of the total electrical energy usage in certain industrial facilities."-DOE statistic (Note: Make that 99% for pipeline companies)

http://virtualpipeline.spaces.live.com/

 

[valdc]

Thanks.