MUD PUMP

Mud pump
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Mud pumps and pits.jpg

A Mud pump is a reciprocating piston/plunger device designed to circulate drilling fluid under high pressure (up to 7500 PSI) down the drill string and back up the annulus.


Mud pumps come in a variety of sizes and configurations but for the typical petroleum drilling rig, the triplex (three piston/plunger) mud pump is the pump of choice. Duplex mud pumps (two piston/plungers) have generally been replaced by the triplex pump, but are still common in developing countries. A later development is the Hex pump with six pistons/plungers.

The "normal" Mud Pump consist of two main subassemblies, the Fluid End and the Power End.

The fluid end produces the pumping process with valves, pistons, and liners. Because these components are high-wear items, modern pumps are designed to allow quick replacement of these parts.

To reduce severe vibration caused by the pumping process, these pumps incorporate both a suction and discharge pulsation dampener. These are connected to the inlet and outlet of the fluid end.

The power end converts the rotation of the drive shaft to the reciprocating motion of the pistons. In most cases a crosshead crank gear is used for this.
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