Electric, Mechanical, Compounds, Pulsation Dampers, Pump Expendables, Relief Valves, Pressure Gauges, Fluid Ends, Vibrator Hoses, Spare Parts

Mud Pumps

Mud pumps are of the reciprocating piston-type, with the reciprocating movement of pistons and rods produced by a conventional crankshaft and connecting rod system. They are positive-displacement type pumps and provide a flow rate that depends directly on the cylinder capacity and the crankshaft rotation rate. In order to adjust the flow rate, the crew counts the cycles per minute, defined by pump strokes per minute. Modern mud pumps are triplex and single-acting (Fig. 2.17). The three pistons move in dismountable cylinder liners, suck up the fluid by a suction pipe, then discharge it into a discharge pipe through a discharge valve.

An important feature of this type of pump is that the cylinder capacity can be altered by changing the diameter of the cylinder liner. When a maximum flow rate is required, the pump is equipped with the largest size liner. When maximum pressure is required (5000 psi – 35 MPa), a liner with a smaller cross-section is usually necessary. 

This type of pump cannot usually suck up fluid directly from the mud pits because of volumetric efficiency and cavitation risks due to high linear piston velocities. As a result, they are boosted, or supercharged, by a centrifugal pump. 
Mud pumps and multiplex pumps are a critical part of any drilling and production program, which makes their reliability a key element of peak operational performance.

Multiplex pumps can move large amounts of fluid through the creation of positive pressure, which assures flow at the surface, regardless of well pressure.
Mud pumps ensure that drilling mud is circulated to the bottom of the hole and to maintain the right pressure and volume to safely carry debris from the wellbore.

We stock various styles of valves, pistons, liners, piston rods, and wear plates, as well as all fluid-end seals and gaskets. We also offer a complete selection of fluid cylinder modules and major service components, such as crankshaft assemblies, gear sets, bearings, and connecting rods.


The fluid end mainly consists of cylinders, discharge pipe, pulsation dampener, valve assembly, liners and pistons.
  • Each sealing part adopts rigidity compaction, which has good high pressure tightness;
  • Vertical fluid end features good suction performance;
  • L fluid end features high pressure resistance, convenient for replacing the valve assembly;
  • Discharge desurger, shear relief valve and discharge strainer are fitted at the discharge outlet;
  • The fluid ends of F-1300 and F-1600 mud pump are interchangeable.


This system mainly consists of spraying pump, cooling water tank and spraying pipe. The function is to cool and wash the liner and piston or plunger so as to improve their service life

The centrifugal spraying pump can be driven by a belt sheave mounted on the pinion end or by a separate motor. Medium for cooling and lubricating is water or JH-1 water-based lubricant and refrigerant

The spraying pipe is mounted on the coupling between extension rod and piston rod and reciprocates with piston. Nozzles are adjacent to piston end so lubricating-cooling fluid can wash the contact surface of pistons and liners all the time. Also, the fixed spraying pipe can be used  


The power end employs integrated methods of forced lubrication and splash lubrication. Forced lubrication includes internal type and external type. The external type independent lubrication system is not influenced by the stroke of the pump, which is of high reliability. The working conditions of gear oil pump can be observed by oil pressure gauge


To avoid air lock at pump inlet under lower pressure, each set of mud pump can be fitted with a charging system. It consists of charging pump with base, butterfly valve, and manifold. The charging pump is driven by a separate motor and is mounted on the suction manifold of mud pump. It can also be driven by the driving shaft of the mud pump via belt to reduce the power consumption.

Powerful mud pumps pick up mud from the suction tank and circulate the mud down hole, out the bit and back to the surface. Although rigs usually have two mud pumps and sometimes three or four, normally they use only one at a time. The others are mainly used as backup just in case one fails. Sometimes however the rig crew may compound the pumps, that is, they may use three or four pumps at the same time to move large volumes of mud when required.

Rigs use one of two types of mud pumps, Triplex pumps or Duplex pumps. Triplex pumps have three pistons that move back-and-forth in liners. Duplex pumps have two pistons move back and forth in liners.


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