Volumetric Efficiency for a rod pump is an easy problem. So do it fast.
7 PRD 9 is the Guidebook page for all Rod Pump equations. It's got everything; no flipping pages! For a quick example from the page:
1) Pump volume displaced equation: PD = 0.1166(Sp)D^2(N).
2) Total fluid pumped is usually given: say 370 BFPD.
3) Given pump data: Sp = 90"*, D = 2", N = 10 SPM.
*Sp, or stroke, is often presented as the pump third number (see 7 PRD 9).
Calculation: 0.1166(90)2^2(10) = 420 BPD
Volumetric Efficiency = BFPD/PD = 380/420 = 90%
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