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Centrifugal Fans Emergency And Normal Shutdown Sequence

- Aug 08, 2018 -

1. Emergency stop: During the trial run of the unit, emergency stop should be immediately taken when one of the following conditions occurs. The operation of the emergency stop is to press the main motor stop button, and then perform the after-treatment after the shutdown.

a. The centrifugal fan suddenly vibrates strongly and has exceeded the trip value.

b. There is scratch or abnormal friction inside the body.

c. Smoke occurs in any bearing or seal, or a bearing temperature rises sharply to the alarm value.

d. When the oil pressure is lower than the alarm value and cannot be restored to normal.

e, the fuel tank has a low liquid level and has been sucked.

f, the axis displacement value shows a significant continuous increase, when the alarm value is reached. 

2.Normal shutdown: The normal shutdown of the unit is carried out according to the following procedure.

a. Gradually open the vent valve (or outlet bypass valve) while gradually closing the vent valve.

b. Gradually close the small intake throttle to 20 to 25°.

c. Press the stop button and pay attention to whether there is any abnormality during the stop.

d. After the unit stops for 5~10min, or when the bearing temperature drops below 45°C, the oil supply can be stopped. For units with a floating ring seal, the seal oil pump must continue to supply oil until the body temperature is below 80 °C.

After the unit is stopped, the rotor should be rotated 180° periodically within 2 to 4 hours.