How do you replace a mechanical seal?

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Mechanical seal is used in centrifugal pump, to keep water or any liquid from making contact with the delicate parts of the machine. Mechanical seal is situated on the shaft of the motor. Under normal conditions, seals wear out much faster than the other pump parts. Abrasives and excessive heat greatly shorten the seal's life span. Regular maintenance of these seals is needed to ensure there are no leaks.


1. Turn off the power. If the centrifugal motor is in motion, turn it off. Shut off the main power supply. Ensure that there is no possibility of the machine starting up, once you get to work.
2. Remove pipe connections. connected to the centrifugal pump. Once disconnected, you are free to set the pump on a table or the floor, wherever you are comfortable.
3. Disconnect the pump. Using a wrench, unscrew the bolts holding the pump housing in place. Carefully disconnect and detach the pump located beyond the housing. Keep these bolts safe. You will need it later to reattach this setup.
4. Dismantle the centrifugal pump’s impeller. The seal is located on the shaft behind the impeller. To detach the shaft, first hold the shaft in place using a wrench. Then unscrew the impeller by rotating it.
5. Replace the seal. Slide a mechanical seal along the shaft of the motor. Note that the front face of the shaft is extremely sensitive, even to the oils secreted by the fingers. Make sure that you don’t touch the face.
6. Screw on the impeller. With the help of a wrench, hold the motor shaft. Screw on the impeller.
7. Screw on the impeller. With the help of a wrench, hold the motor shaft. Screw on the impeller.
8. Reconnect the pump. Using a wrench and the bolts from Step 3, reattach the pump and the motor.
9. Reconnect the centrifugal pump. Place the reconnected system back into the piping, connect suction and discharge
10. Restart the machine. After reattaching the pipes centrifugal pump, test the performance