APSB series centrifugal pump for drilling mud system

Centrifugal pump is a design in use within pumping applications. It consists of a pump head containing the main working elements which rotate to produce flow and pressure when driven by a motor.

APSB series centrifugal pump is used for transferring mud or water in the oil & gas drilling industry. It can be used as a feeding pump for mud desander, mud desilter, or used as a mixing pump for jet mud mixer. Also, it can be used as a trip pump, and supercharging pump for rig mud pump. 

AIPU centrifugal pump model

How does a centrifugal pump work?

The pump head is made up of several parts and in its simplest form consists of a Pump head, shaft, and an impeller. A motor coupled to the pump head rotates the pump head shaft, which in turn rotates the impeller.

This causes a vacuum to be created within the pump head, drawing fluid into the casing. The centrifugal force of the rotating impeller causes fluid to be thrown to the outside of the casing, leading it to be ejected from the pump casing which is usually via an outlet located at the top of the pump casing.

Parts of a centrifugal pump

A pump relies on different parts for its correct function, working motion, and longevity.


The motor is used to transfer power to the pump head by converting electrical into rotational mechanical energy, which is used to rotate the motor or output shaft, which in turn rotates the coupling and pump shaft. This in turn rotates the impeller producing flow and pressure.


The impeller rotates at the same speed as the pump shaft and is responsible for producing the flow and pressure in the pump.


A coupling is used to connect both the motor and pump shaft ensuring both shafts rotate at the same speed and in the same plain and is responsible for transferring both torque and speed between the two parts. The coupling can be rigid or flexible.

Mechanical Seal

A pump head is sealed via the use of a mechanical seal. A mechanical Seal seals around the shaft, and pump casing. This seal consists of two faces and a spring which press against each other forming a seal and are cooled by the pumped fluid.


These reduce friction between moving part and ensures rotation remains as per the required motion.

O Rings

O Rings are used to sealing around metal parts such as within the pump casing, or around drainage ports as metal is unable to create a seal without an elastomer, silicone, or plastic, acting as a barrier.

They are usually placed into grooves where they are compressed between mating surfaces sealing the leak path.

During metal manufacture and fabrication there are design tolerances, and fluctuations with O Rings used to account for and accommodate differences in mating surfaces.


The shaft is connected to the driving motor and ensures the rotational movement is carried into the head of the pump, rotating the impeller at the same speed as the motor shaft.

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