Shutdown Procedure For Centrifugal Fan

1. Emergency shutdown: During the trial operation of the unit, if any of the following situations occur, an emergency shutdown should be immediately carried out. The operation of emergency shutdown is to press the main motor stop button and then carry out the follow-up work after shutdown.
a. The centrifugal fan suddenly experienced strong vibration and has exceeded the trip value.
b. There are scraping or abnormal friction sounds inside the body.
c. Smoking occurs at any bearing or seal, or the temperature of a certain bearing rises sharply to the alarm value.
d. When the oil pressure is below the alarm value and cannot be restored to normal.
e. The fuel tank level is low and there has been a suction phenomenon.
f. When the axis displacement value shows a significant continuous increase and reaches the alarm value.
2. Normal shutdown: The normal shutdown of the unit should be operated according to the following procedure.
a. Gradually open the vent valve (or outlet bypass valve) while gradually closing the exhaust valve.
b. Gradually close the intake throttle valve to 20-25 °.
c. Press the stop button and pay attention to any abnormal phenomena during the shutdown process.
d. After the unit stops for 5-10 minutes, or when the bearing temperature drops below 45 ℃, the oil supply can be stopped. For units with floating ring seals, the sealed oil pump must continue to supply oil until the body temperature drops below 80 ℃.
After the unit stops, the rotor should be periodically rotated 180 ° within 2-4 hours.