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1.7" Hard Pump: Actuating Rod Weight vs. Annulus Volume Freight <br /> weight of actuating rod as affected by buoyancy <br /> ,j <br /> 1 <br /> 100 — — — — — — — T00"Pump,nstaiiaimn <br /> E ••• - - - _ - _ 100 <br /> 90 I �+ <br /> 1 +•• 90 <br /> f •i <br /> 90 I •• <br /> • 80 <br /> • <br /> 70 , <br /> ., EXAMPLE-Given 50 ft.pump instalEation with 50 ft.water • •+ 70 <br /> �a table,discounting the friction of the a <br /> piston. I <br /> H At the time pumping begins (point 4an uVward ! 3 • 60x <br /> H 50 liIling force of 13.9 pounds is required to overcome the I •• 4) <br /> initial weight of the actuating rod.As water rises up • -� - - - - - i - - �- 50 <br /> T the annulus, the buoyancy effect begins to negate I �• •• 0in'a instauat _40 _ 50 <br /> the weight of the actuating rod. When the annulus y •• •0 j <br /> '7 height reaches 37 ft_ (point 2),the pump is then at • <br /> iji equilibrium. As the water continues to rise, the ` • ++• 0)buoyancy effect overcomes the weight of the ac- •" '- - - - - - - - !�- _ - _ _ ` ` 40 2 <br /> t tualing rod to the point that,as water begins to flow E •• •• -- " - - - - 37 � <br /> S0 from the well head(point 3),a downward force of 4.8 I �4 • C <br /> pounds is required. I i i •• 304:z <br /> 20 NO7E_Regardless of pump installation depth,all curves i <br /> have the same slope_ • • <br /> f � • <br /> �' I f % • 20 <br /> I Y <br /> Y 10 <br /> • <br /> _ -a_s <br /> 11 40 •35 •30 •25 -20 .15 •10 _5 Q 10 15 0 <br /> 25 38 35 40 1 <br /> iia I <br /> T Actuating Rod Weight (pounds) I <br /> 1 <br /> 1. <br /> ' E <br /> 1 <br /> i. <br /> ll F <br /> i:J I, <br />