Progressing Cavity Pump Efficiency

[hondashadow1100vt]

I am looking for technical information that can clearly explain how progressing cavity pump manufacturers determine/arrive at their pump efficiency ratings and curves. I would be grateful for any feedback that can be offered.

 

[ashtree]

I don't know exactly what you are looking for but the overall calculation is easy.

At the most fundamental level Power out/Power in = efficiency. If you know how much energy is being used to drive the pump, the flow from the pump and the pressure being generated its dead easy. Water power (kw) = (Q(l/sec)x Head(m))/102

Water Power/ Power in = efficiency.



Regards
Ashtree
"Any water can be made potable if you filter it through enough money"

 

[bimr]

Turbolab has a discussion:

http://turbolab.tamu.edu/proc/pumpproc/P12/P1247-59.pdf

 

[hondashadow1100vt]

bimr:

Thank you for the Turbolab reference, which I promptly read. In lay person terms that paper seems to indicate that PC pump efficiency (or perhaps more effectively communicated as pump power) is a function of: a) selected rotor-stator combination's mechanical tolerances/clearances, b) differential pressure generated by the pump, c) starting torque (which is a function of the mechanical tolerances).

Seems like a balancing act of pump design parameters where the pump manufacturer/representative, with knowledge of all of their various pump offerings, can really earn their pay. It also seems like one application could arguably be served by different pump selections with significantly different power requirements. ...and perhaps two different pump application engineers might select two different pumps to do the same thing (i.e., As much of an art as a science).

I poked around in the Turbolab website and found that it seems to have some other good resources relating to progressing cavity pumps. Thank you again for the tip!

 

[MikeHalloran]

There was an extensive discussion of that subject not long ago, somewhere on this site, originated by someone who was using PC pumps as hydraulic motors, driven by drilling mud, for directional drilling.



Mike Halloran
Pembroke Pines, FL, USA