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!
