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CENTRIFUGAL PUMP (part I)


Pump is one of equipment where it’s uses to transport  fluids from one place to another place through a piping media by adding the energy to the liquid being removed and continues over time.

One type of non-positive displacement pump is a centrifugal pump,  that principle works is to change the
kinetic energy (speed) into potential energy fluid (dynamic) through a rotating impeller in the casing.

how the principle of centrifugal pump work ??? yes….you alright…. Pump driven by the motor, the power given to the shaft of the motor to the pump rotating impeller mounted on the shaft. Liquid in the impeller will rotates due to impulse blades. Since the emergence of centrifugal force, the liquid flowing from the center out through the channel between the impeller blades and leaves the impeller at high speed. Liquid that comes out of the impeller at high speed then flows through the channels continues to expand its section (volute / diffuser),resulting in a change of velocity head into pressure head. Then the liquid out of the pump head flange out of the total increase. Aspiration occurs because after liquid thrown by the impeller, the space between the blades into the vacuum so liquid will be sucked inside.

Centrifugal_Pump

Centrifugal pump

if we look at the picture above, it would seem that the incoming liquid (green) through the impeller suction and then by the liquid will be transported through Discharge nozzle.

Part of Centrifugal pumps

part centrifugal pump

part 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 of 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 on the stuffing box . In the multi-stage pumps can as 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 diffusor ( guide vane ) , inlet and outlet nozzles as well as providing a place of impeller flow direction and velocity of the liquid to convert energy into dynamic energy ( single stage ) .

G. Eye of Impeller
Entrance on the side toward the suction impeller .

H. impeller
Impeller is used to convert the mechanical energy of the pump energy into the fluid velocity is pumped continuously , so that the liquid on the suction side is continuously going in to fill the void caused by the displacement of the liquid that goes before.

I. wearing Ring
Wearing ring serves to minimize leakage of fluid 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 friction loss is small.

K. casing
Is the outermost part of the pump that serves as a protective element rotates , the seat diffusor ( guide vane ) , inlet and outlet nozzles as well as providing a place of impeller flow direction and velocity of the liquid to convert energy into dynamic energy ( single stage ) .

Ok, this’s end of our discussion at the first step, next time we will discuss about “Head of Pump”

Source : wikipedia, pompa & kompressor, catatan abimanyu’s blog

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