Centrifugal fan shutdown procedure precautions

1. Emergency shutdown: During the trial operation of the unit, if one of the following situations occurs, the unit should be shut down immediately. The emergency shutdown operation is to press the main motor stop button, and then perform the aftermath after the shutdown.
a. The centrifugal fan suddenly vibrates violently and exceeds the trip value.
b. There is a scratch or abnormal friction sound inside the body.
c. Smoke appears at any bearing or seal, or the temperature of a bearing rises sharply to the alarm value.
d. When the oil pressure is lower than the alarm value and cannot return to normal.
e. The oil tank level is low and there is a vacuum phenomenon.
f. The shaft displacement value shows a significant continuous increase and reaches the alarm value.
2. Normal shutdown: The unit is shut down normally according to the following procedures.
a. Gradually open the vent valve (or outlet bypass valve) and gradually close the exhaust valve.
b. Gradually close the intake throttle to 20-25°.
c. Press the stop button and pay attention to any abnormal phenomena during the shutdown process.
d. The oil supply can be stopped 5 to 10 minutes after the unit stops, or when the bearing temperature drops below 45°C. For units with floating ring seals, the sealing oil pump must continue to supply oil until the body temperature is below 80°C.
After the unit stops, the rotor should be rotated 180° regularly within 2 to 4 hours.

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