Normal start and stop sequence of centrifugal pump
The normal start and stop sequence of a centrifugal pump is crucial for its normal operation and extended service life. The following is the normal start and stop sequence of a centrifugal pump:
1. Pump start sequence
Preparation phase:
Check whether all safety components are normal, including the pump body, motor, valve, etc.
Turn the pump, that is, manually turn the backrest wheel of the pump, and check whether its rotation is smooth and even without jamming.
Check the oil level and ensure that the lubricating oil reaches the specified oil level to ensure the lubrication of the pump bearing.
Open the cooling water system (if the pump has cooling water requirements) to ensure that the cooling water circulates normally.
Injection and exhaust:
Open the inlet valve of the pump and inject water into the pump until the pump body and pipeline are filled with water.
Open the exhaust valve and exhaust the air in the pump and pipeline until the top vent valve discharges water evenly and then close the exhaust valve.
Start the motor:
After confirming that the motor is rotating in the correct direction, start the motor.
Observe the operation of the motor to ensure that the current is stable and does not exceed the rated value.
Adjust the outlet valve:
After the motor speed is normal, gradually open the outlet valve of the pump and adjust the flow and pressure of the pump to the required range.
During this process, pay attention to the motor current and the pump pressure gauge to ensure that they are within the normal range.
2. Pump stop sequence
Close the outlet valve:
Gradually close the pump outlet valve to reduce the pump flow and pressure.
Stop the pump:
After the outlet valve is completely closed, stop the motor.
Close the inlet valve and drain:
Close the pump inlet valve and cut off the water source.
If necessary, open the exhaust valve or vent valve to drain the remaining water in the pump to prevent the pump body and pipeline from freezing or corrosion.
Other precautions:
After stopping the pump, check whether the pump body and pipeline have leakage and deal with it in time.
For pumps that have been out of service for a long time, maintenance work such as rust prevention and corrosion prevention should be done to ensure that they can operate normally the next time they are used.
The above is the normal start and stop sequence and precautions of the centrifugal pump. In actual operation, it should be strictly implemented in accordance with the regulations to ensure the safe and stable operation of the pump.
