Major parts of the Centrifugal Pump

In general, the main parts of a centrifugal pump can be seen sepert following picture:

Casing Centrifugal Pump

A. Stuffing Box
Stuffing Box serves to prevent leaks in the area where the shaft penetrates the pump casing.
B. Packing
Used to prevent and reduce the leakage of fluid from the pump casing through the shaft. Usually made of asbestos or Teflon.
C. Shaft (shaft)
Serves to continue the shaft torque from the drive during operation and the seat of the impeller and other rotating parts.
D. Shaft sleeve
Shaft sleeve serves to protect the shaft from erosion, corrosion and wear at the stuffing box. In the multi-stage pump may be a joint leakage, and interstage internal bearing or distance sleever.
E. Vane
Blades of the impeller as the passage of fluid on the impeller.
F. Casing
Is the outermost part of the pump that serves as a protective element rotates, the seat of the diffusor (guide vane), inlet and outlet nozzles as well as providing the direction of flow of the impeller and convert energy into dynamic energy fluid velocity (single stage).
G. Eye of Impeller
The side entrance to the direction of the suction impeller.
H. Impeller
Impeller is used to convert the mechanical energy of the pump energy into the fluid being pumped speed continuously, so that the liquid on the suction side is continuously going in to fill the void caused by the displacement of the fluid before entering.
I. Wearing Ring
Wearing the ring serves to minimize fluid leakage past the front of the impeller and the back of the impeller, by minimizing the gap between the impeller casing.
J. Bearing
Beraing (pads) serves to rivet and the weight of the shaft in order to rotate, either radial load and axial load. Bearing also allows the shaft to rotate smoothly and stays in place, so that the frictional losses become small.
  K. Casing
Is the outermost part of the pump that serves as a protective element rotates, the seat of the diffusor (guide vane), inlet and outlet nozzles as well as providing the direction of flow of the impeller and convert energy into dynamic energy fluid velocity (single stage).
Pump capacity
Pump capacity is the amount of fluid that can be moved by the pump per unit time. Expressed in units of volume per unit time, such as:

     Barrels per day (BPD)
     Gallons per minute (GPM)
     Cubic meters per hour (m3 / hr)