Centrifugal fan shutdown procedure
1. Emergency stop: in the process of unit trial operation, in case of any of the following circumstances, emergency stop shall be carried out immediately. The operation of the emergency stop is to press the stop button of the main motor, and then carry out the remedial work after the stop.
a. The centrifugal fan suddenly vibrated strongly and exceeded the trip value.
b. There is scraping 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 liquid level of the oil tank is low, and there is suction phenomenon.
f. When the value of shaft displacement increases continuously and reaches the alarm value.
2. Normal shutdown: the normal shutdown of the unit shall be operated according to the following procedures.
a. Open the vent valve (or outlet bypass valve) step by step and close the vent valve step by step.
b. Gradually close the throttle valve to 20-25 °.
c. Press the stop button, and pay attention to whether there is any abnormal phenomenon during the shutdown.
d. After the unit stops for 5-10min, or when the bearing temperature drops below 45 ℃, the oil supply can be stopped. For the unit with floating ring seal, the seal oil pump must continue to supply oil until the temperature of the body is lower than 80 ℃. After the unit stops, rotate the rotor 180 ° regularly within 2-4 hours.https://www.ck-stone.com/