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Mud Pumps 75

Discharge Discharge
P 2 P 2

Piston
Piston Rod d L
d r

L s

P
P 1 1
Suction Suction
Figure 3.6 Double-action stroke in a duplex pump.

Discharge
P 2

Piston
Piston Rod d L

L s

P 1
Suction
Figure 3.7 Single-action stroke in a triplex pump.

pumping speed, and the volumetric efficiency. The rod size changes with
the size of the liner. The pumping speed can be adjusted if diesel engines
or DC motors are used as the prime movers. The volumetric efficiency
varies with the fluid properties.