Duplex Pump Output in bbl/stk = 0.000162 x S [2(D)2 — d2]
Where :
D = liner diameter in inches
d = rod diameter in inches
S = stroke length in inches
SPM = strokes per minute
6 inch by 12 inch liner
Duplex pump 90% efficiency
Rod diameter 1.75 inches
1 : Duplex Pump Output in bbl/stk = 0.000162 * 12 * [2(6)2 – (1.75)2] 2 : Duplex Pump Output in bbl/stk = .001944 * (72 – 3.0625) 3 : Duplex Pump Output in bbl/stk = .1340